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