[Architect] Abp 框架原理解析(3) 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

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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

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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

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

 

 

 

定义Filter

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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

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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