适用于：.net 2.0+的Winform项目
样子：
有损录制+制图的原因不可能原样展示出真实效果，可至文章结尾下载Demo体验。
功能和特点：
- 相对父窗体居中
- 可附带附加消息。附加消息可以是string和Exception类型，【详细信息】按钮会根据是否传入附加信息显示和隐藏
- 展开/收起附加信息时有动画效果。实用为王的你亦可设置EnableAnimate=false关闭动画效果
- 根据传入的MessageBoxIcon，有不同的声音反馈。这个是NT5的消息框固有的能力，但NT6的消息框却没有声音，猜想可能MS在NT6+有弃用MessageBeep这一API的打算。本消息框通过使用PlaySound API重新让消息有了声音反馈，同时亦提供了EnableSound属性允许你关闭声音反馈
- 移除了标准MessageBox提供的IWin32Window、MessageBoxOptions和Help相关参数，原因是我用不到，懒得实现^_^
- 可拖拉改变消息框尺寸，消息文本和附加文本会随窗体大小重排。这是标准消息框未提供的能力。改变尺寸分两种情况有不同的行为：①详细信息未展开时，改变的是主消息区大小；②详细信息展开时，改变的是详细信息区的大小
总体来说，此消息框比较适合用在需要反馈大量消息文本的场合，用标准消息框的话，文本太多可能会使消息框超出屏幕大小，比如codeproject.com上这位老兄举的例子，由于标准消息框不具备改变窗体大小的能力，将导致部分消息无法让用户看到。而就算没有超出屏幕，一下子让用户面对那么多消息文字，体验也不地道。使用本消息框就可以解决此类问题，比如可以将扼要信息显示在主消息区，将大量的明细消息（例如批量处理中的单项处理情况）、次要消息、异常信息等放置在详细信息区，由用户或IT支持人员自己去展开获取这些信息。同时，在没有附加消息的时候，你仍然可以像标准消息框一样使用它，所以，如果你跟我一样不会用到标准消息框的IWin32Window、MessageBoxOptions和Help相关参数的话，基本上你可以在整个项目中全程用此消息框替换掉标准消息框，别忘了相比标准消息框，它还具备了可缩放、NT6下有声音、相对父窗体居中等额外能力。总言之，你值得拥有。至于如果你担心性能问题，这个~我想这么说，我对自己的代码质量还是有点信心的。也希望能得大侠指出槽点，感激！
使用说明：
先看公开成员：
//静态属性MessageBoxEx.EnableAnimateMessageBoxEx.EnableSound//静态方法MessageBoxEx.Show(string, string, string)MessageBoxEx.Show(string, string, string, MessageBoxButtons)MessageBoxEx.Show(string, string, string, MessageBoxButtons, MessageBoxIcon)MessageBoxEx.Show(string, string, string, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton)MessageBoxEx.Show(string, string, Exception)MessageBoxEx.Show(string, string, Exception, MessageBoxButtons)MessageBoxEx.Show(string, string, Exception, MessageBoxButtons, MessageBoxIcon)MessageBoxEx.Show(string, string, Exception, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton)
- 属性EnableAnimate和EnableSound上面提过，分别是用来启用/关闭动画、声音效果的，默认是都启用。俩属性影响范围是全局的，比如设置EnableAnimate = false后，之后弹出的MessageBoxEx都没有动画效果，直到重新设为true，EnableSound亦然。最佳实践是将它俩与用户偏好设置相关联，允许用户自主控制。
- 方法则只有一个：Show()，从重载列表你大概都能知道如何使用。其中第3个参数就是附加消息，可接受string和Exception类的实例，其余参数的位置和意义与标准消息框一致。简要示例如下：
MessageBoxEx.Show("主消息", "标题", "附加消息", MessageBoxButtons.OK, MessageBoxIcon.None, MessageBoxDefaultButton.Button1);MessageBoxEx.Show("主消息", "标题", ex, MessageBoxButtons.OK, MessageBoxIcon.None, MessageBoxDefaultButton.Button1);
- 前3个参数可以放心为null，内部有处理，后面的枚举你也null不了，如果传入无效枚举值，会抛异常。
- 只有3个string参数的那个方法，后面俩参数是可选的。所以不讲究消息体验的你仍然可以这样使用：
MessageBoxEx.Show("阿斯顿发");MessageBoxEx.Show("阿斯顿发", "士大夫");
方案源码：
代码不少，原因自然是有的，有兴趣的童鞋请看后面的实现说明。另外，千万不要认为代码量跟性能有直接关系，有时候更多的代码恰恰是为了提升性能而存在，有时候则是为了健壮性。
using System;using System.ComponentModel;using System.Drawing;using System.IO;using System.Runtime.InteropServices;using System.Threading;using System.Windows.Forms;namespace AhDung.WinForm{ /// <summary> /// 可以携带详细信息的消息框 /// </summary> public static class MessageBoxEx { //异常消息文本 private const string InvalidButtonExString = "按钮参数不是有效的枚举项！"; private const string InvalidIconExString = "图标参数不是有效的枚举项！"; private const string InvalidDfButtonExString = "默认按钮参数不是有效的枚举项！"; /// <summary> /// 是否启用动画效果 /// </summary> public static bool EnableAnimate { get; set; } /// <summary> /// 是否启用声音反馈 /// </summary> public static bool EnableSound { get; set; } //静态构造 static MessageBoxEx() { //默认启用动画+声音 EnableAnimate = true; EnableSound = true; } #region 公开方法 /// <summary> /// 显示消息框 /// </summary> /// <param name="message">消息文本</param> /// <param name="caption">消息框标题</param> /// <param name="attachMessage">附加消息</param> public static DialogResult Show(string message, string caption = null, string attachMessage = null) { return ShowCore(message, caption, attachMessage, MessageBoxButtons.OK, MessageBoxIcon.None, MessageBoxDefaultButton.Button1); } /*下面这仨弄成重载而不是可选方法是为了避免不必要的参数检查*/ /// <summary> /// 显示消息框 /// </summary> /// <param name="message">消息文本</param> /// <param name="caption">消息框标题</param> /// <param name="attachMessage">附加消息</param> /// <param name="buttons">按钮组合</param> public static DialogResult Show(string message, string caption, string attachMessage, MessageBoxButtons buttons) { if (!Enum.IsDefined(typeof(MessageBoxButtons), buttons)) { throw new InvalidEnumArgumentException(InvalidButtonExString); } return ShowCore(message, caption, attachMessage, buttons, MessageBoxIcon.None, MessageBoxDefaultButton.Button1); } /// <summary> /// 显示消息框 /// </summary> /// <param name="message">消息文本</param> /// <param name="caption">消息框标题</param> /// <param name="attachMessage">附加消息</param> /// <param name="buttons">按钮组合</param> /// <param name="icon">图标</param> public static DialogResult Show(string message, string caption, string attachMessage, MessageBoxButtons buttons, MessageBoxIcon icon) { if (!Enum.IsDefined(typeof(MessageBoxButtons), buttons)) { throw new InvalidEnumArgumentException(InvalidButtonExString); } if (!Enum.IsDefined(typeof(MessageBoxIcon), icon)) { throw new InvalidEnumArgumentException(InvalidIconExString); } return ShowCore(message, caption, attachMessage, buttons, icon, MessageBoxDefaultButton.Button1); } /// <summary> /// 显示消息框 /// </summary> /// <param name="message">消息文本</param> /// <param name="caption">消息框标题</param> /// <param name="attachMessage">附加消息</param> /// <param name="buttons">按钮组合</param> /// <param name="icon">图标</param> /// <param name="defaultButton">默认按钮</param> public static DialogResult Show(string message, string caption, string attachMessage, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton) { if (!Enum.IsDefined(typeof(MessageBoxButtons), buttons)) { throw new InvalidEnumArgumentException(InvalidButtonExString); } if (!Enum.IsDefined(typeof(MessageBoxIcon), icon)) { throw new InvalidEnumArgumentException(InvalidIconExString); } if (!Enum.IsDefined(typeof(MessageBoxDefaultButton), defaultButton)) { throw new InvalidEnumArgumentException(InvalidDfButtonExString); } return ShowCore(message, caption, attachMessage, buttons, icon, defaultButton); } /********传入异常的重载********/ /// <summary> /// 显示消息框 /// </summary> /// <param name="message">消息文本</param> /// <param name="caption">消息框标题</param> /// <param name="exception">异常实例</param> public static DialogResult Show(string message, string caption, Exception exception) { return Show(message, caption, exception == null ? string.Empty : exception.ToString()); } /// <summary> /// 显示消息框 /// </summary> /// <param name="message">消息文本</param> /// <param name="caption">消息框标题</param> /// <param name="exception">异常实例</param> /// <param name="buttons">按钮组合</param> public static DialogResult Show(string message, string caption, Exception exception, MessageBoxButtons buttons) { return Show(message, caption, exception == null ? string.Empty : exception.ToString(), buttons); } /// <summary> /// 显示消息框 /// </summary> /// <param name="message">消息文本</param> /// <param name="caption">消息框标题</param> /// <param name="exception">异常实例</param> /// <param name="buttons">按钮组合</param> /// <param name="icon">图标</param> public static DialogResult Show(string message, string caption, Exception exception, MessageBoxButtons buttons, MessageBoxIcon icon) { return Show(message, caption, exception == null ? string.Empty : exception.ToString(), buttons, icon); } /// <summary> /// 显示消息框 /// </summary> /// <param name="message">消息文本</param> /// <param name="caption">消息框标题</param> /// <param name="exception">异常实例</param> /// <param name="buttons">按钮组合</param> /// <param name="icon">图标</param> /// <param name="defaultButton">默认按钮</param> public static DialogResult Show(string message, string caption, Exception exception, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton) { return Show(message, caption, exception == null ? string.Empty : exception.ToString(), buttons, icon, defaultButton); } #endregion //内部方法，不检查参数有效性 private static DialogResult ShowCore(string message, string caption, string attachMessage, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton) { using (MessageForm f = new MessageForm(message, caption, buttons, icon, defaultButton, attachMessage, EnableAnimate, EnableSound)) { return f.ShowDialog(); } } /*---------------- 下面是消息窗体相关 ---------------*/ /// <summary> /// 消息窗体 /// </summary> /// <remarks>参数有效性由MessageBoxEx负责</remarks> private class MessageForm : Form { /* todo 存在问题： * 当消息区文本非常非常多时，且反复进行改变消息框窗口大小、位置、展开收起的操作，那么在某次展开时 详细信息文本框可能会在原位置（即消息区内某rect）瞬闪一下， 原因是文本框控件在显示时总会在原位置WM_NCPAINT + WM_ERASEBKGND一下，暂无解决办法。 实际应用中碰到的几率很小，就算碰到，影响也可以忽略。 */ #region 控件初始化 /// <summary> /// 必需的设计器变量。 /// </summary> private System.ComponentModel.IContainer components = null; /// <summary> /// 清理所有正在使用的资源。 /// </summary> /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param> protected override void Dispose(bool disposing) { if (disposing && (components != null)) { components.Dispose(); } base.Dispose(disposing); } #region Windows 窗体设计器生成的代码 /// <summary> /// 设计器支持所需的方法 - 不要 /// 使用代码编辑器修改此方法的内容。 /// </summary> private void InitializeComponent() { this.button3 = new System.Windows.Forms.Button(); this.txbAttach = new TextBoxUnSelectAllable(); this.button2 = new System.Windows.Forms.Button(); this.button1 = new System.Windows.Forms.Button(); this.plButtonsZone = new AhDung.WinForm.MessageBoxEx.MessageForm.PanelBasic(); this.ckbToggle = new AhDung.WinForm.MessageBoxEx.MessageForm.ToggleButton(this.UseAnimate); this.plAttachZone = new AhDung.WinForm.MessageBoxEx.MessageForm.PanelBasic(); this.lbMsg = new AhDung.WinForm.MessageBoxEx.MessageForm.MessageViewer(); this.plButtonsZone.SuspendLayout(); this.plAttachZone.SuspendLayout(); this.SuspendLayout(); // // button3 // this.button3.Anchor = System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right; this.button3.Location = new System.Drawing.Point(320, 8); this.button3.Margin = new System.Windows.Forms.Padding(3, 2, 3, 2); this.button3.Name = "button3"; this.button3.Size = new System.Drawing.Size(85, 27); this.button3.TabIndex = 2; // // txbAttach // this.txbAttach.Anchor = ((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom) | System.Windows.Forms.AnchorStyles.Left) | System.Windows.Forms.AnchorStyles.Right; this.txbAttach.Location = new System.Drawing.Point(10, 7); this.txbAttach.Margin = new System.Windows.Forms.Padding(3, 1, 3, 1); this.txbAttach.Name = "txbAttach"; this.txbAttach.ReadOnly = true; this.txbAttach.Multiline = true; this.txbAttach.ScrollBars = System.Windows.Forms.ScrollBars.Vertical; this.txbAttach.Size = new System.Drawing.Size(395, 105); this.txbAttach.TabIndex = 0; // // button2 // this.button2.Anchor = System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right; this.button2.Location = new System.Drawing.Point(229, 8); this.button2.Margin = new System.Windows.Forms.Padding(3, 2, 3, 2); this.button2.Name = "button2"; this.button2.Size = new System.Drawing.Size(85, 27); this.button2.TabIndex = 1; // // button1 // this.button1.Anchor = System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right; this.button1.Location = new System.Drawing.Point(138, 8); this.button1.Margin = new System.Windows.Forms.Padding(3, 2, 3, 2); this.button1.Name = "button1"; this.button1.Size = new System.Drawing.Size(85, 27); this.button1.TabIndex = 0; // // plButtonsZone // this.plButtonsZone.Controls.Add(this.ckbToggle); this.plButtonsZone.Controls.Add(this.button1); this.plButtonsZone.Controls.Add(this.button2); this.plButtonsZone.Controls.Add(this.button3); this.plButtonsZone.Dock = System.Windows.Forms.DockStyle.Bottom; this.plButtonsZone.Location = new System.Drawing.Point(0, 96); this.plButtonsZone.Margin = new System.Windows.Forms.Padding(3, 1, 3, 1); this.plButtonsZone.Name = "plButtonsZone"; this.plButtonsZone.Size = new System.Drawing.Size(415, 36); this.plButtonsZone.TabIndex = 1; // // ckbToggle // this.ckbToggle.Location = new System.Drawing.Point(10, 8); this.ckbToggle.Name = "ckbToggle"; this.ckbToggle.Size = new System.Drawing.Size(93, 27); this.ckbToggle.TabIndex = 3; this.ckbToggle.Text = "详细信息(&D)"; this.ckbToggle.CheckedChanged += this.ckbToggle_CheckedChanged; // // plAttachZone // this.plAttachZone.Controls.Add(this.txbAttach); this.plAttachZone.Dock = System.Windows.Forms.DockStyle.Fill; this.plAttachZone.Location = new System.Drawing.Point(0, 130); this.plAttachZone.Margin = new System.Windows.Forms.Padding(3, 2, 3, 2); this.plAttachZone.Name = "plAttachZone"; this.plAttachZone.Size = new System.Drawing.Size(415, 114); this.plAttachZone.TabIndex = 2; this.plAttachZone.Visible = false; // // lbMsg // this.lbMsg.Dock = System.Windows.Forms.DockStyle.Fill; this.lbMsg.Icon = null; this.lbMsg.Location = new System.Drawing.Point(0, 0); this.lbMsg.Name = "lbMsg"; this.lbMsg.Padding = new System.Windows.Forms.Padding(21, 18, 21, 18); //this.lbMsg.Size = new System.Drawing.Size(415, 96); this.lbMsg.TabIndex = 0; // // FmMsg // this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.None; //this.ClientSize = new System.Drawing.Size(415, 261); this.Controls.Add(this.lbMsg); this.Controls.Add(this.plButtonsZone); this.Controls.Add(this.plAttachZone); this.DoubleBuffered = true; this.MaximizeBox = false; this.Name = "MessageForm"; this.Padding = new System.Windows.Forms.Padding(0, 0, 0, 17); this.ShowIcon = false; this.ShowInTaskbar = false; this.SizeGripStyle = System.Windows.Forms.SizeGripStyle.Show; this.plButtonsZone.ResumeLayout(false); this.plAttachZone.ResumeLayout(false); this.plAttachZone.PerformLayout(); this.ResumeLayout(false); } #endregion private ToggleButton ckbToggle; private TextBoxUnSelectAllable txbAttach; private MessageViewer lbMsg; private System.Windows.Forms.Button button2; private System.Windows.Forms.Button button1; private PanelBasic plButtonsZone; private PanelBasic plAttachZone; private System.Windows.Forms.Button button3; #endregion /// <summary> /// 最大默认窗体客户区宽度 /// </summary> const int MaxClientWidth = 700; int expandHeight; /// <summary> /// 详细信息区展开高度 /// </summary> private int ExpandHeight { get { return expandHeight < 150 ? 150 : expandHeight; } set { expandHeight = value; } } #region 属性 /// <summary> /// 是否启用动画效果 /// </summary> /// <remarks>此处还弄该属性是为了保证窗体类的独立性</remarks> private bool UseAnimate { get; set; } /// <summary> /// 是否启用声音反馈 /// </summary> /// <remarks>此处还弄该属性是为了保证窗体类的独立性</remarks> private bool UseSound { get; set; } /// <summary> /// 消息按钮 /// </summary> private MessageBoxButtons MessageButtons { get; set; } /// <summary> /// 消息图标 /// </summary> private MessageBoxIcon MessageIcon { get; set; } /// <summary> /// 默认按钮 /// </summary> private MessageBoxDefaultButton DefaultButton { get; set; } #endregion /// <summary> /// 创建消息窗体 /// </summary> private MessageForm(bool enableAnimate) { this.UseAnimate = enableAnimate;//须尽早设置，要供展开按钮初始化用 InitializeComponent(); this.StartPosition = Form.ActiveForm == null ? FormStartPosition.CenterScreen : FormStartPosition.CenterParent; this.Font = SystemFonts.MessageBoxFont; //注册事件 this.button1.Click += button_Click; this.button2.Click += button_Click; this.button3.Click += button_Click; this.plAttachZone.Resize += plAttachZone_Resize; } /// <summary> /// 创建消息窗体 /// </summary> public MessageForm(string message, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton, string attachMessage, bool enableAnimate, bool enableSound) : this(enableAnimate) { this.lbMsg.Text = message; this.Text = caption; this.txbAttach.Text = attachMessage; this.MessageButtons = buttons; this.MessageIcon = icon; this.DefaultButton = defaultButton; this.UseSound = enableSound; } #region 重写基类方法 protected override void OnLoad(EventArgs e) { //须在计算各种尺寸前搞掂 ProcessIcon(); ProcessButtons(); this.MinimumSize = SizeFromClientSize(new Size(GetPanelButtonMinWidth(), GetClientMinHeight())); //参数意义定为客户区最大大小，所以需刨掉非客户区高度后传入 this.ClientSize = this.GetPreferredSize(new Size(MaxClientWidth, Screen.PrimaryScreen.WorkingArea.Height - (this.Height - this.ClientSize.Height))); base.OnLoad(e); } protected override void OnShown(EventArgs e) { //设置默认按钮焦点。须在OnShown中设置按钮焦点才有用 Button dfBtn; if ((dfBtn = this.AcceptButton as Button) != null) { dfBtn.Focus(); } //播放消息提示音 if (this.UseSound) { PlayMessageSound(this.MessageIcon); } base.OnShown(e); } //重写窗体参数 protected override CreateParams CreateParams { get { CreateParams prms = base.CreateParams; if ((Convert.ToInt32(this.MessageButtons) & 1) == 0) //没有Cancel按钮时屏蔽关闭按钮，刚好在偶数项 { prms.ClassStyle |= 0x200; } return prms; } } /// <summary> /// 计算合适的窗口尺寸 /// </summary> /// <param name="proposedSize">该参数此处定义为客户区可设置的最大尺寸</param> public override Size GetPreferredSize(Size proposedSize) { int reservedHeight = plButtonsZone.Height + Padding.Bottom; Size size = lbMsg.GetPreferredSize(new Size(proposedSize.Width, proposedSize.Height - reservedHeight)); size.Height += reservedHeight; return size; } #endregion #region 事件处理方法 //展开收起 private void ckbToggle_CheckedChanged(object sender, EventArgs e) { this.SuspendLayout(); if (ckbToggle.Checked) { plButtonsZone.SendToBack(); lbMsg.SendToBack(); lbMsg.Dock = DockStyle.Top; plButtonsZone.Dock = DockStyle.Top; ChangeFormHeight(ExpandHeight); plAttachZone.Visible = true; } else { ExpandHeight = plAttachZone.Height;//记忆展开高度 plAttachZone.Visible = false; ChangeFormHeight(-ExpandHeight); plButtonsZone.SendToBack(); plButtonsZone.Dock = DockStyle.Bottom; lbMsg.Dock = DockStyle.Fill; } this.ResumeLayout(); } //按钮事件 private void button_Click(object sender, EventArgs e) { this.DialogResult = (DialogResult)((sender as Button).Tag); } //用户手工收完详细区则触发折叠 private void plAttachZone_Resize(object sender, EventArgs e) { if (ckbToggle.Checked && plAttachZone.Height == 0) { ckbToggle.Checked = false; } } #endregion #region 辅助+私有方法 /// <summary> /// 处理按钮相关 /// </summary> private void ProcessButtons() { this.ckbToggle.Visible = txbAttach.Text.Trim().Length != 0; //无详细信息就不显示展开按钮 int btnCount = 3; //按钮数量 switch (MessageButtons) //老实用case，可读点 { case MessageBoxButtons.AbortRetryIgnore: button1.Text = "中止(&A)"; button1.Tag = DialogResult.Abort; button2.Text = "重试(&R)"; button2.Tag = DialogResult.Retry; button3.Text = "忽略(&I)"; button3.Tag = DialogResult.Ignore; break; case MessageBoxButtons.OK: button1.Visible = false; button2.Visible = false; button3.Text = "确定"; button3.Tag = DialogResult.OK; btnCount = 1; break; case MessageBoxButtons.OKCancel: button1.Visible = false; button2.Text = "确定"; button2.Tag = DialogResult.OK; button3.Text = "取消"; button3.Tag = DialogResult.Cancel; btnCount = 2; break; case MessageBoxButtons.RetryCancel: button1.Visible = false; button2.Text = "重试(&R)"; button2.Tag = DialogResult.Retry; button3.Text = "取消"; button3.Tag = DialogResult.Cancel; btnCount = 2; break; case MessageBoxButtons.YesNo: button1.Visible = false; button2.Text = "是(&Y)"; button2.Tag = DialogResult.Yes; button3.Text = "否(&N)"; button3.Tag = DialogResult.No; btnCount = 2; break; case MessageBoxButtons.YesNoCancel: button1.Text = "是(&Y)"; button1.Tag = DialogResult.Yes; button2.Text = "否(&N)"; button2.Tag = DialogResult.No; button3.Text = "取消"; button3.Tag = DialogResult.Cancel; break; default: break; } //仅有OK和有取消按钮时设CancelButton if ((int)MessageButtons == 0 || ((int)MessageButtons & 1) == 1) { this.CancelButton = button3; } //处理默认按钮 if (btnCount == 1) { this.AcceptButton = button3; } else if (btnCount == 2) { this.AcceptButton = DefaultButton == MessageBoxDefaultButton.Button2 ? button3 : button2; } else { Button[] btnArray = { button1, button2, button3 }; this.AcceptButton = btnArray[Convert.ToInt32(DefaultButton) / 0x100]; } } /// <summary> /// 处理图标 /// </summary> /// <remarks>之所以不在此处顺便把Sound处理了是为了松耦合</remarks> private void ProcessIcon() { switch (MessageIcon) { //MessageBoxIcon.Information同样 case MessageBoxIcon.Asterisk: lbMsg.Icon = SystemIcons.Information; break; //MessageBoxIcon.Hand、MessageBoxIcon.Stop同样 case MessageBoxIcon.Error: lbMsg.Icon = SystemIcons.Error; break; //MessageBoxIcon.Warning同样 case MessageBoxIcon.Exclamation: lbMsg.Icon = SystemIcons.Warning; break; case MessageBoxIcon.Question: lbMsg.Icon = SystemIcons.Question; break; default: lbMsg.Icon = null; break; } } /// <summary> /// 计算窗体客户区最小高度 /// </summary> private int GetClientMinHeight() { return lbMsg.MinimumHeight + plButtonsZone.Height + Padding.Bottom; } /// <summary> /// 计算按钮区最小宽度 /// </summary> private int GetPanelButtonMinWidth() { int r = 20 /*左右Padding*/, visibleCount = -1 /*因为两个以上才会有间距*/; if (ckbToggle.Visible) { r += ckbToggle.Width; visibleCount++; } if (button1.Visible) { r += button1.Width * 3; visibleCount += 3; } else if (button2.Visible) { r += button2.Width * 2; visibleCount += 2; } else { r += button3.Width; visibleCount++; } if (visibleCount != -1) { r += visibleCount * 6; } //按钮间距 return r; } /// <summary> /// 改变窗体高度。内部有动画处理 /// </summary> /// <param name="increment">增量（负数即为减小高度）</param> private void ChangeFormHeight(int increment) { int finalHeight = this.Height + increment; //正确的目标高度 if (!this.UseAnimate) //不使用动画 { this.Height = finalHeight; return; } const int step = 8; //帧数 for (int i = 0; i < step; i++) { if (i == step - 1) //最后一步直达目标 { this.Height = finalHeight; return; } this.Height += increment / step; Application.DoEvents(); //必要 Thread.Sleep(10); } } /// <summary> /// 播放系统事件声音 /// </summary> /// <remarks>之所以不用MessageBeep API是因为这货在NT6上不出声，所以用PlaySound代替</remarks> private static void PlayMessageSound(MessageBoxIcon msgType) { string eventString; switch (msgType) { case MessageBoxIcon.None: eventString = "SystemDefault"; break; //Question原本是没声音的，此实现让它蹭一下Information的 case MessageBoxIcon.Question: //MessageBoxIcon.Information同样 case MessageBoxIcon.Asterisk: eventString = "SystemAsterisk"; break; //MessageBoxIcon.Hand、MessageBoxIcon.Stop同样 case MessageBoxIcon.Error: eventString = "SystemHand"; break; //MessageBoxIcon.Warning同样 case MessageBoxIcon.Exclamation: eventString = "SystemExclamation"; break; default: throw new ArgumentOutOfRangeException(); } PlaySound(eventString, IntPtr.Zero, 0x10000 /*SND_ALIAS*/| 0x1 /*SND_ASYNC*/); } [DllImport("winmm.dll", CharSet = CharSet.Auto)] private static extern bool PlaySound([MarshalAs(UnmanagedType.LPWStr)] string soundName, IntPtr hmod, int soundFlags); #endregion #region 嵌套类 /// <summary> /// 基础面板 /// </summary> private class PanelBasic : Control { public PanelBasic() { SetStyle(ControlStyles.AllPaintingInWmPaint, false);//关键，不要设置双缓冲，不然其上的ToolBar不正常 SetStyle(ControlStyles.OptimizedDoubleBuffer, true);//重要。不设置的话控件绘制不正常 SetStyle(ControlStyles.ContainerControl, true); SetStyle(ControlStyles.Selectable, false); } protected override void WndProc(ref Message m) { //屏蔽WM_ERASEBKGND。防止显示时在原位置快闪 //不能通过ControlStyles.AllPaintingInWmPaint=true屏蔽 //会影响其上的ToolBar if (m.Msg == 0x14) { return; } base.WndProc(ref m); } protected override void SetBoundsCore(int x, int y, int width, int height, BoundsSpecified specified) { //防Dock时面板短暂滞留在原位置 base.SetBoundsCore(x, y, width, height, specified | BoundsSpecified.Y | BoundsSpecified.Width); } } /// <summary> /// 消息呈现控件 /// </summary> private class MessageViewer : Control { const TextFormatFlags textFlags = TextFormatFlags.EndEllipsis //未完省略号 | TextFormatFlags.WordBreak //允许换行 | TextFormatFlags.NoPadding //无边距 | TextFormatFlags.ExternalLeading //行间空白。NT5必须，不然文字挤在一起 | TextFormatFlags.TextBoxControl; //避免半行 const int IconSpace = 5; //图标与文本间距 const float PreferredScale = 13;//最佳文本区块比例（宽/高） /// <summary> /// 最小高度。不要重写MinimumSize，那会在窗体移动和缩放时都会执行 /// </summary> public int MinimumHeight { get { return (this.Icon != null ? Math.Max(this.Icon.Height, this.Font.Height) : this.Font.Height) + Padding.Vertical; } } /// <summary> /// 获取或设置图标 /// </summary> public Icon Icon { get; set; } public MessageViewer() { this.SetStyle(ControlStyles.CacheText, true); this.SetStyle(ControlStyles.UserPaint, true); this.SetStyle(ControlStyles.AllPaintingInWmPaint, true); this.SetStyle(ControlStyles.Selectable, false); this.SetStyle(ControlStyles.ResizeRedraw, true); //重要 this.DoubleBuffered = true; //双缓冲 BackColor = Environment.OSVersion.Version.Major == 5 ? SystemColors.Control : Color.White; } //防Dock改变尺寸 protected override void SetBoundsCore(int x, int y, int width, int height, BoundsSpecified specified) { base.SetBoundsCore(x, y, width, height, specified | BoundsSpecified.Size); } /// <summary> /// 计算合适的消息区尺寸 /// </summary> /// <param name="proposedSize">该参数此处定义为此控件可设置的最大尺寸</param> /// <remarks>该方法对太长的单行文本有做比例优化处理，避免用户摆头幅度过大扭到脖子</remarks> public override Size GetPreferredSize(Size proposedSize) { if (proposedSize.Width < 10) { proposedSize.Width = int.MaxValue; } if (proposedSize.Height < 10) { proposedSize.Height = int.MaxValue; } int reservedWidth = Padding.Horizontal + (this.Icon == null ? 0 : (this.Icon.Width + IconSpace)); Size wellSize = Size.Empty; if (!string.IsNullOrEmpty(this.Text)) { //用指定宽度测量文本面积 Size size = TextRenderer.MeasureText(this.Text, this.Font, new Size(proposedSize.Width - reservedWidth, 0), textFlags); int lineHeight = TextRenderer.MeasureText(" ", this.Font, new Size(int.MaxValue, 0), textFlags).Height;//单行高，Font.Height不靠谱 wellSize = Convert.ToSingle(size.Width) / size.Height > PreferredScale //过于宽扁的情况 ? Size.Ceiling(GetSameSizeWithNewScale(size, PreferredScale)) : size; //凑齐整行高，确保尾行显示 wellSize.Height = Convert.ToInt32(Math.Ceiling(wellSize.Height / Convert.ToDouble(lineHeight))) * lineHeight; } if (this.Icon != null) { wellSize.Width += this.Icon.Width + IconSpace; wellSize.Height = Math.Max(this.Icon.Height, wellSize.Height); } wellSize += Padding.Size; //不应超过指定尺寸。宽度在上面已确保不会超过 if (wellSize.Height > proposedSize.Height) { wellSize.Height = proposedSize.Height; } return wellSize; } /// <summary> /// 重绘 /// </summary> protected override void OnPaint(PaintEventArgs e) { Graphics g = e.Graphics; Rectangle rect = GetPaddedRectangle(); //绘制图标 if (this.Icon != null) { g.DrawIcon(this.Icon, Padding.Left, Padding.Top); //右移文本区 rect.X += this.Icon.Width + IconSpace; rect.Width -= this.Icon.Width + IconSpace; //若文字太少，则与图标垂直居中 if (this.Text.Length < 100) { Size textSize = TextRenderer.MeasureText(g, this.Text, this.Font, rect.Size, textFlags); if (textSize.Height <= this.Icon.Height) { rect.Y += (this.Icon.Height - textSize.Height) / 2; } } } //g.FillRectangle(Brushes.Gainsboro, rect);//test //绘制文本 TextRenderer.DrawText(g, this.Text, this.Font, rect, Color.Black, textFlags); base.OnPaint(e); } /// <summary> /// 根据原尺寸，得到相同面积、且指定比例的新尺寸 /// </summary> /// <param name="src">原尺寸</param> /// <param name="scale">新尺寸比例。需是width/height</param> private static SizeF GetSameSizeWithNewScale(Size src, float scale) { int sqr = src.Width * src.Height;//原面积 double w = Math.Sqrt(sqr * scale);//新面积宽 return new SizeF(Convert.ToSingle(w), Convert.ToSingle(sqr / w)); } /// <summary> /// 获取刨去Padding的内容区 /// </summary> private Rectangle GetPaddedRectangle() { Rectangle r = this.ClientRectangle; r.X += this.Padding.Left; r.Y += this.Padding.Top; r.Width -= this.Padding.Horizontal; r.Height -= this.Padding.Vertical; return r; } } /// <summary> /// 屏蔽全选消息的文本框 /// </summary> private class TextBoxUnSelectAllable : TextBox { protected override void WndProc(ref Message m) { //EM_SETSEL if (m.Msg == 0xB1) { return; } base.WndProc(ref m); } } /// <summary> /// 包装ToolBarButton为单一控件 /// </summary> private class ToggleButton : Control { /// <summary> /// 展开/收起图标数据 /// </summary> const string ImgDataBase64 =@"iVBORw0KGgoAAAANSUhEUgAAACAAAAAQCAYAAAB3AH1ZAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAA3NJREFUeNqklVlPFEEQx/8zPccue6gorMd6gBegeCAQD4w+oCx+AInxIB4EfTK8+g2MQUUTcBU8En0wmvigEkyMxgcTjRrUqHFVUBRQQaJGl2WPmbG6dzCLWUiESf7T0739666urqqVDjVcxT9PAWkfqZKUY491ktpIzaRXGPv5L15J+dZIRx26dqAwf56c48+Cx+1CzDDR//13/seevvx3HZ8O"; readonly bool isToggleMode; bool isChecked; bool useAnimate; readonly ImageList imgList; /// <summary> /// Checked改变后 /// </summary> public event EventHandler CheckedChanged; /// <summary> /// 使用动画按钮效果 /// </summary> private bool UseAnimate { get { return useAnimate; } set { if (useAnimate == value) { return; } useAnimate = value; if (IsHandleCreated) { this.CreateHandle(); } } } /// <summary> /// 获取或设置按钮是否处于按下状态 /// </summary> [Description("获取或设置按钮是否处于按下状态"), DefaultValue(false)] public bool Checked { get { if (IsHandleCreated) { //保证isChecked与实情吻合。TB_ISBUTTONCHECKED isChecked = Convert.ToBoolean(SendMessage(this.Handle, 0x40A, IntPtr.Zero, IntPtr.Zero).ToInt32()); } return isChecked; } set { if (isChecked == value || !isToggleMode) { return; } isChecked = value; if (IsHandleCreated) { //TB_CHECKBUTTON SendMessage(this.Handle, 0x402, IntPtr.Zero, new IntPtr(Convert.ToInt32(value))); } OnCheckedChanged(EventArgs.Empty); } } /// <summary> /// 创建ToolBarButtonControl /// </summary> public ToggleButton(bool useAnimate) { SetStyle(ControlStyles.UserPaint, false); SetStyle(ControlStyles.AllPaintingInWmPaint, true); SetStyle(ControlStyles.OptimizedDoubleBuffer, true); SetStyle(ControlStyles.ResizeRedraw, true); this.isToggleMode = true;//写死好了，独立版才提供设置 this.UseAnimate = useAnimate; //将图标加入imageList imgList = new ImageList { ImageSize = new System.Drawing.Size(16, 16), ColorDepth = ColorDepth.Depth32Bit }; using (MemoryStream ms = new MemoryStream(Convert.FromBase64String(ImgDataBase64))) { imgList.Images.AddStrip(Image.FromStream(ms)); } } /// <summary> /// 执行左键单击 /// </summary> public void PerformClick() { SendMessage(this.Handle, 0x201, new IntPtr(0x1), IntPtr.Zero);//WM_LBUTTONDOWN Application.DoEvents(); SendMessage(this.Handle, 0x202, IntPtr.Zero, IntPtr.Zero); //WM_LBUTTONUP } protected override void WndProc(ref Message m) { //有节操的响应鼠标动作 if ((m.Msg == 0x201 || m.Msg == 0x202) && (!this.Enabled || !this.Visible)) { return; } base.WndProc(ref m); } //创建ToolBar protected override CreateParams CreateParams { get { CreateParams prms = base.CreateParams; prms.ClassName = "ToolbarWindow32"; prms.Style = 0x40000000 | 0x10000000 //| 0x2000000 //WS_CLIPCHILDREN //| 0x8000 | 0x1 | 0x4 | 0x8 | 0x40 | 0x1000 //TBSTYLE_LIST，图标文本横排 ; if (UseAnimate) { prms.Style |= 0x800; }//TBSTYLE_FLAT。flat模式在NT6.x下，按钮按下会有动画效果 prms.ExStyle = 0; return prms; } } protected override void OnHandleCreated(EventArgs e) { base.OnHandleCreated(e); //设置imgList SendMessage(this.Handle, 0x430, IntPtr.Zero, imgList.Handle);//TB_SETIMAGELIST //准备添加按钮 int btnStructSize = Marshal.SizeOf(typeof(TBBUTTON)); SendMessage(this.Handle, 0x41E, new IntPtr(btnStructSize), IntPtr.Zero);//TB_BUTTONSTRUCTSIZE，必须在添加按钮前 //构建按钮信息 TBBUTTON btnStruct = new TBBUTTON { //iBitmap = 0, //idCommand = 0, fsState = 0x4, //TBSTATE_ENABLED iString = SendMessage(this.Handle, 0x44D, 0, this.Text + '\0')//TB_ADDSTRING }; if (this.isToggleMode) { btnStruct.fsStyle = 0x2; }//BTNS_CHECK。作为切换按钮时 IntPtr btnStructStart = IntPtr.Zero; try { btnStructStart = Marshal.AllocHGlobal(btnStructSize);//在非托管区创建一个指针 Marshal.StructureToPtr(btnStruct, btnStructStart, true);//把结构体塞到上述指针 //添加按钮 SendMessage(this.Handle, 0x444, new IntPtr(1)/*按钮数量*/, btnStructStart);//TB_ADDBUTTONS。从指针取按钮信息 //设置按钮尺寸刚好为ToolBar尺寸 AdjustButtonSize(); } finally { if (btnStructStart != IntPtr.Zero) { Marshal.FreeHGlobal(btnStructStart); } } } protected override bool ProcessCmdKey(ref Message m, Keys keyData) { //将空格和回车作为鼠标单击处理 if (m.Msg == 0x100 && (keyData == Keys.Enter || keyData == Keys.Space)) { PerformClick(); return true; } return base.ProcessCmdKey(ref m, keyData); } /// <summary> /// 处理助记键 /// </summary> protected override bool ProcessMnemonic(char charCode) { if (IsMnemonic(charCode, this.Text)) { PerformClick(); return true; } return base.ProcessMnemonic(charCode); } protected override void OnClick(EventArgs e) { //忽略鼠标右键 MouseEventArgs me = e as MouseEventArgs; if (me != null && me.Button != System.Windows.Forms.MouseButtons.Left) { return; } //若是切换模式，直接引发Checked事件（不要通过设置Checked属性引发，因为OnClick发送之前就已经Check了） //存在理论上的不可靠，但暂无更好办法 if (isToggleMode) { this.OnCheckedChanged(EventArgs.Empty); } base.OnClick(e); } //重绘后重设按钮尺寸 protected override void OnInvalidated(InvalidateEventArgs e) { base.OnInvalidated(e); AdjustButtonSize(); } /// <summary> /// 引发CheckedChanged事件 /// </summary> protected virtual void OnCheckedChanged(EventArgs e) { SetImageIndex(this.Checked ? 1 : 0); if (CheckedChanged != null) { CheckedChanged(this, e); } } /// <summary> /// 设置图标索引 /// </summary> private void SetImageIndex(int index) { //TB_CHANGEBITMAP SendMessage(this.Handle, 0x42B, IntPtr.Zero, new IntPtr(index)); } /// <summary> /// 调整按钮尺寸刚好为ToolBar尺寸 /// </summary> private void AdjustButtonSize() { IntPtr lParam = new IntPtr((this.Width & 0xFFFF) | (this.Height << 0x10)); //MakeLParam手法 SendMessage(this.Handle, 0x41F, IntPtr.Zero, lParam); //TB_SETBUTTONSIZE } #region Win32 API [DllImport("user32.dll", CharSet = CharSet.Auto)] private static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam); [DllImport("user32.dll", CharSet = CharSet.Auto)] private static extern IntPtr SendMessage(IntPtr hWnd, int msg, int wParam, string lParam); [StructLayout(LayoutKind.Sequential)] private struct TBBUTTON { public int iBitmap; public int idCommand; public byte fsState; public byte fsStyle; public byte bReserved0; public byte bReserved1; public IntPtr dwData; public IntPtr iString; } #endregion } #endregion } }}MessageBoxEx.cs
实现说明：
以下内容献给爱“八卦”和蛋疼的童鞋。这里先贴个概要类图，详细的后面有完整Demo下载，你可以down回去慢慢研究。
- 若干Show方法都是调用私有的ShowCore方法，这个是模仿标准MessageBox的命名。至于意义，是因为公开方法要做参数检查，检查合格后的代码则可以重用。另外，几个存在参数检查的方法都是调用内部方法，而不是调参数最全的那个重载，也是因为要尽量避免无谓的参数检查，因为参数最全的那个公开方法，参数检查自然是做的最多的，那么少参方法本来已经能确保传入的是合法参数，却因为调它，就会造成无谓的检查，而调内部方法则可以避免，因为内部方法就应该设计为不做或少做参数检查的。啰嗦这个是想提醒初学者注意这些细节上的处理，性能要从细处抓起
- 静态类MessageBoxEx内部维护着一个MessageForm窗体类（下文简称MsgFm），每次Show都会实例化一个MsgFm，show完即释放。几乎所有能力都是由后者提供，前者只是简单的对其封装和暴露，所以下面主要说MsgFm的事。另外，根据传入的MessageBoxButtons有无Cancel项，会启用/屏蔽窗体右上角的关闭按钮，因为该单击关闭按钮的默认对话框结果就是DialogResult.Cancel，所以如果不屏蔽，在传入YesNo这样的参数时候，调用者可能因为用户去点关闭按钮而得到Yes、No以外的结果。标准消息框也是有这样的屏蔽处理的
- MsgFm由3个控件区构成，分别是主消息区、按钮区、详细信息区。
- 主消息区是一个单一控件：MessageViewer，直接继承自Control写成。一开始是考虑用现成的Label控件，但发现后者的图文混排效果差强人意（不要扯这个成语本来的意思），它是把文字直接盖在图标上，呵呵，大概此控件的编写者本意就是要把Image当BackgroundImage用，所以不得已另写一个MessageViewer。MV主要做了两个事，绘制（图标和文本）+根据内容确定自身尺寸，另外它还控制了最小高度，避免图标和文本整体被淹没
- 按钮区由一个容器类控件PanelBasic托起4个按钮。PB同样是继承自Control，没有直接选用Panel的原因，主要是Panel会在设置Dock时跳一下，根源在Control.SetBoundsCore的specified参数通知了无谓的信息，所以干脆直接继承Control重写该方法，顺便处理一下消息，解决瞬闪的问题，具体原因这里不细说，注释里有简短说明，总之相信我不是蛋疼就行了
- PanelBasic上的4个按钮分别是【详细信息】按钮和其它3个对话框命令按钮。仨按钮根据传入的MessageBoxButtons参数动态处理（按钮文本、是否可见等），没什么好说的。【详细信息】按钮（ToggleButton）则费了番功夫，该按钮从外观上就可以看出不是标准的Button，事实上它是个工具栏按钮：ToolBarButton，属于ToolBar上的Item，本身不是独立的控件（直接继承自Component）。这里扯一点，由于.net 2.0起MS就建议用新式的ToolStrip代替ToolBar，类似的还有MenuStrip代替MainMenu、StatusStrip代替StatusBar、ContextMenuStrip代替ContextMenu，VS2010更是默认就不在工具箱显示这些“控件”（有些不算控件），所以估计知道的新童鞋不多。后者都是原生的win32组件，前者则是纯.net实现的，有Office2003的控件风格。总之对于有win32 native控的我来说，对这些被建议替代的老式控件有特别的情结。所以这个ToggleButton实际上是由一个ToolBar和一个ToolBarButton组成的看起来像一个单一控件的东西，那为什么它还是继承自Control而不是直接用ToolBar呢，我承认这里面有练手的原因（迟些我可能会写一篇【教你一步步封装一个Win32原生控件】的文章），Hmmm~也就这个原因了，但它虽然增加了代码量，但请务必相信性能不比直接用ToolBar差，理论上还要好过，因为作为一个完备的ToolBar，MS要考虑的情况相当多，显然处理也少不了，而我这个ToggleButton由于只负责一个单一按钮的功能，所以其实很Simple很Lite~聪明的你会理解的。最后为什么要费事弄成ToolBarButton而不是直接用一个Button，是因为我看上了mstsc.exe的这个效果：
顺便说一点，EnableAnimate属性有作用到该按钮，原理是当ToolBar具有Flat样式的时候，按钮按下和弹起就有动画效果，否则没有 - 最后是详细信息区，由一个PanelBasic托起一个简单改造过的TextBox构成。干嘛不单纯用一个TextBox，而要在它底下垫一层呢，是因为在XP上的效果不好（控件狗要考虑的情况很多了啦好不好），XP窗口边框不如NT6粗，不加点衬料的话太单薄。话说回来，PanelBasic上面已说过，而所谓改造过的这个TextBox叫TextBoxUnSelectAllable，就干一件事，忽略全选消息（EM_SETSEL），避免焦点移进去的时候蓝莹莹一大片吓到观众。而为什么不用标准TextBox的Enter事件取消全选，一个字~太low
- 尚存在一个问题，这个注释里也有坦白，就是当主消息文本非常非常多时~大概整屏那么长（这其实是不正确的使用姿势，上面说过，大量信息应该放详细信息区），如果对对话框反复拖拉、展开/收起，那么在某次展开时，TextBoxUnSelectAllable会瞬间在主消息区闪一下，这个问题在PanelBasic得到了完美的解决，但TextBox实在无能为力，尝试过直接用原生Edit控件也如此，所以暂时留着吧，哪有没缺憾的人生呢
- 至于消息框的声音，NT6上的标准消息框原本就是没有声音的，所以照常用MessageBeep API，无声就无声，也无不可，但我考虑即便是尽量靠向原生，也不代表啥都要照搬，取其精华弃其糟泊才是正道，所以用了PlaySound API，让消息声回到NT6的世界，同时XP表现不变~人家原本就有声音
- 最后，【详细信息】按钮上那俩图标（展开、收起各一个）是我画的，本来想拣mstsc.exe上的，但发现效果不如意，还不如自己画
说了这么多，自以为很理想的实现，可能槽点也不少，再次恳请路过大侠指点，谢谢。
最后，Demo在此，里面有个Tester供你体验：
-文毕-
原标题：【C#】分享一个带附加消息的增强消息框MessageBoxEx
关键词：C#
我知道了 