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[ASP.net教程]ASP.NETC#通用扩展函数之TypeParse 类型转换方便多了


 

 

用法:

      var int1 = "2".TryToInt();//转换为int失败返回0      var int2 = "2x".TryToInt();      var int3 = "2".TryToInt(1);//转换为int失败返回1      var int4 = "2x".TryToInt(1);      var d1 = "2".TryToMoney(); //同上      var d2 = "2x".TryToMoney();      var d3 = "2".TryToMoney(1);      var d4 = "2x".TryToMoney(1);      string a = null;      var s1 = a.TryToString();      var s3 = a.TryToString("1");      var d11 = "2".TryToDecimal();      var d22 = "2x".TryToDecimal();      var d33 = "2".TryToDecimal(1);      var d44 = "2x".TryToDecimal(1);      var de1 = "2013-1-1".TryToDate();      var de2 = "x2013-1-1".TryToDate();      var de3 = "x2013-1-1".TryToDate(DateTime.Now);      //json和model转换      var json = new { id = 1 }.ModelToJson();      var model = "{id:1}".JsonToModel<ModelTest>();      //list和dataTable转换      var dt = new List<ModelTest>().ListToDataTable();      var list = dt.DataTableToList<ModelTest>();

  

 

代码:

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Web.Script.Serialization;using System.Data;using System.Reflection;using System.Collections;namespace SyntacticSugar{  /// <summary>  /// ** 描述:类型转换  /// ** 创始时间:2015-6-2  /// ** 修改时间:-  /// ** 作者:sunkaixuan  /// ** 使用说明:  /// </summary>  public static class TypeParseExtenions  {    #region 强转成int 如果失败返回 0    /// <summary>    /// 强转成int 如果失败返回 0    /// </summary>    /// <param name="thisValue"></param>    /// <param name="i"></param>    /// <returns></returns>    public static int TryToInt(this object thisValue)    {      int reval = 0;      if (thisValue != null && int.TryParse(thisValue.ToString(), out reval))      {        return reval;      }      return reval;    }    #endregion    #region 强转成int 如果失败返回 errorValue    /// <summary>    /// 强转成int 如果失败返回 errorValue    /// </summary>    /// <param name="thisValue"></param>    /// <param name="i"></param>    /// <returns></returns>    public static int TryToInt(this object thisValue, int errorValue)    {      int reval = 0;      if (thisValue != null && int.TryParse(thisValue.ToString(), out reval))      {        return reval;      }      return errorValue;    }    #endregion    #region 强转成double 如果失败返回 0    /// <summary>    /// 强转成money 如果失败返回 0    /// </summary>    /// <param name="thisValue"></param>    /// <param name="i"></param>    /// <returns></returns>    public static double TryToMoney(this object thisValue)    {      double reval = 0;      if (thisValue != null && double.TryParse(thisValue.ToString(), out reval))      {        return reval;      }      return 0;    }    #endregion    #region 强转成double 如果失败返回 errorValue    /// <summary>    /// 强转成double 如果失败返回 errorValue    /// </summary>    /// <param name="thisValue"></param>    /// <param name="errorValue"></param>    /// <returns></returns>    public static double TryToMoney(this object thisValue, int errorValue)    {      double reval = 0;      if (thisValue != null && double.TryParse(thisValue.ToString(), out reval))      {        return reval;      }      return errorValue;    }    #endregion    #region 强转成string 如果失败返回 ""    /// <summary>    /// 强转成string 如果失败返回 ""    /// </summary>    /// <param name="thisValue"></param>    /// <param name="i"></param>    /// <returns></returns>    public static string TryToString(this object thisValue)    {      if (thisValue != null) return thisValue.ToString().Trim();      return "";    }    #endregion    #region 强转成string 如果失败返回 errorValue    /// <summary>    /// 强转成string 如果失败返回 str    /// </summary>    /// <param name="thisValue"></param>    /// <param name="errorValue"></param>    /// <returns></returns>    public static string TryToString(this object thisValue, string errorValue)    {      if (thisValue != null) return thisValue.ToString().Trim();      return errorValue;    }    #endregion    #region 强转成Decimal 如果失败返回 0    /// <summary>    /// 强转成Decimal 如果失败返回 0    /// </summary>    /// <param name="thisValue"></param>    /// <param name="i"></param>    /// <returns></returns>    public static Decimal TryToDecimal(this object thisValue)    {      Decimal reval = 0;      if (thisValue != null && decimal.TryParse(thisValue.ToString(), out reval))      {        return reval;      }      return 0;    }    #endregion    #region 强转成Decimal 如果失败返回 errorValue    /// <summary>    /// 强转成Decimal 如果失败返回 errorValue    /// </summary>    /// <param name="thisValue"></param>    /// <param name="errorValue"></param>    /// <returns></returns>    public static Decimal TryToDecimal(this object thisValue, int errorValue)    {      Decimal reval = 0;      if (thisValue != null && decimal.TryParse(thisValue.ToString(), out reval))      {        return reval;      }      return errorValue;    }    #endregion    #region 强转成DateTime 如果失败返回 DateTime.MinValue    /// <summary>    /// 强转成DateTime 如果失败返回 DateTime.MinValue    /// </summary>    /// <param name="thisValue"></param>    /// <param name="i"></param>    /// <returns></returns>    public static DateTime TryToDate(this object thisValue)    {      DateTime reval = DateTime.MinValue;      if (thisValue != null && DateTime.TryParse(thisValue.ToString(), out reval))      {        return reval;      }      return reval;    }    #endregion    #region 强转成DateTime 如果失败返回 errorValue    /// <summary>    /// 强转成DateTime 如果失败返回 errorValue    /// </summary>    /// <param name="thisValue"></param>    /// <param name="errorValue"></param>    /// <returns></returns>    public static DateTime TryToDate(this object thisValue, DateTime errorValue)    {      DateTime reval = DateTime.MinValue;      if (thisValue != null && DateTime.TryParse(thisValue.ToString(), out reval))      {        return reval;      }      return errorValue;    }    #endregion    #region json转换    /// <summary>    /// 将json序列化为实体    /// </summary>    /// <typeparam name="TEntity"></typeparam>    /// <param name="json"></param>    /// <returns></returns>    public static TEntity JsonToModel<TEntity>(this string json)    {      JavaScriptSerializer jsSerializer = new JavaScriptSerializer();      return jsSerializer.Deserialize<TEntity>(json);    }    /// <summary>    /// 将实体序列化为json    /// </summary>    /// <param name="model"></param>    /// <returns></returns>    public static string ModelToJson<T>(this T model)    {      JavaScriptSerializer jsSerializer = new JavaScriptSerializer();      return jsSerializer.Serialize(model);    }    #endregion    #region DataTable List    /// <summary>    /// 将集合类转换成DataTable    /// </summary>    /// <param name="list">集合</param>    /// <returns></returns>    public static DataTable ListToDataTable<T>(this List<T> list)    {      DataTable result = new DataTable();      if (list.Count > 0)      {        PropertyInfo[] propertys = typeof(T).GetProperties();        foreach (PropertyInfo pi in propertys)        {          result.Columns.Add(pi.Name, pi.PropertyType);        }        for (int i = 0; i < list.Count; i++)        {          ArrayList tempList = new ArrayList();          foreach (PropertyInfo pi in propertys)          {            object obj = pi.GetValue(list[i], null);            if (obj != null && obj != DBNull.Value)              tempList.Add(obj);          }          object[] array = tempList.ToArray();          result.LoadDataRow(array, true);        }      }      return result;    }    /// <summary>    /// 将datatable转为list    /// </summary>    /// <typeparam name="T"></typeparam>    /// <param name="dt"></param>    /// <returns></returns>    public static List<T> DataTableToList<T>(this DataTable dt)    {      var list = new List<T>();      Type t = typeof(T);      var plist = new List<PropertyInfo>(typeof(T).GetProperties());      foreach (DataRow item in dt.Rows)      {        T s = System.Activator.CreateInstance<T>();        for (int i = 0; i < dt.Columns.Count; i++)        {          PropertyInfo info = plist.Find(p => p.Name == dt.Columns[i].ColumnName);          if (info != null)          {            if (!Convert.IsDBNull(item[i]))            {              info.SetValue(s, item[i], null);            }          }        }        list.Add(s);      }      return list;    }     #endregion  }}