[Architect] Abp 框架原理解析 DynamicFilters

本节目录

• 介绍
• 定义Filter
• 设置Filter

这是Abp中多租户、软删除、激活\禁用等如此方便的原因

Install-Package EntityFramework.DynamicFilters

定义数据

  class DemoDb : DbContext  {    public DemoDb() : base("Default")    {    }    public IDbSet<Blog> Blogs { get; set; }  }  interface ISoftDelete  {    bool IsDeleted { get; set; }  }  class Blog : ISoftDelete  {    public int Id { get; set; }    public string Name { get; set; }    public bool IsDeleted { get; set; }  }

初始化数据

    static void Main(string[] args)    {      using (var db = new DemoDb())      {        for (int i = 0; i < 5; i++)        {          db.Blogs.Add(new Blog { Name = i.ToString() });        }        for (int i = 0; i < 5; i++)        {          db.Blogs.Add(new Blog { Name = i.ToString(), IsDeleted = true });        }        db.SaveChanges();      }      Console.WriteLine("Done");      Console.ReadLine();    }

查询数据

    private static void Query()    {      using (var db = new DemoDb())      {        Console.WriteLine(db.Blogs.Count());      }    }

定义Filter

    protected override void OnModelCreating(DbModelBuilder modelBuilder)    {      //以下几种效果均一样      modelBuilder.Filter("IsDeleted", (ISoftDelete entity) => entity.IsDeleted, false);      //modelBuilder.Filter("IsDeleted", (ISoftDelete entity) => entity.IsDeleted == false);      //modelBuilder.Filter("IsDeleted", (Blog entity) => entity.IsDeleted, () =>      //{      //  //todo other      //  return false;      //});      //多参数情况      modelBuilder.Filter("BlogFilter",          (Blog b, int id, bool isDeleted) => (b.Id == id) && (b.IsDeleted == isDeleted),          () => 1,          () => false);    }

设置Filter

修改参数值

    private static void Query()    {      using (var db = new DemoDb())      {        db.SetFilterScopedParameterValue("IsDeleted", true);        db.SetFilterScopedParameterValue("BlogFilter", "id", 2);        Console.WriteLine(db.Blogs.Count());      }    }

启用/禁用过滤

禁用代码:

context.DisableFilter("IsDeleted");

context.DisableAllFilter();

modelBuilder.DisableFilterGlobally("IsDeleted");

启用代码:

context.EnableFilter();

context.EnableAllFilter();

参考:

https://github.com/jcachat/EntityFramework.DynamicFilters

本文地址:http://www.cnblogs.com/neverc/p/5258184.html

原标题：[Architect] Abp 框架原理解析 DynamicFilters

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