Question

这是我的数据库表

CREATE TABLE [dbo].[MyClass] (
    [Id]       INT        IDENTITY (1, 1) NOT NULL,
    [Criteria] NCHAR (50) NOT NULL,
    PRIMARY KEY CLUSTERED ([Id] ASC)
);

SET IDENTITY_INSERT MyClass ON;
insert into MyClass(Id, Criteria) values('1', 'Value1');
insert into MyClass(Id, Criteria) values('2', 'Value2');

连接字符串

 <add name="EFDbContext" connectionString="Data Source=(localdb)\v11.0;Initial Catalog=MyTableName;Integrated Security=True" providerName="System.Data.SqlClient"  />

和EFDbContext类

public class EFDbContext : DbContext {
    public EFDbContext()
        : base("EFDbContext") {
    }

    public DbSet<MyClass> MyClasses { get; set; }
}

但是，'count'的值始终为零。

public class MyController : Controller
{        
    public ActionResult Index() {
        var db = new EFDbContext();            
        var firstValue = db.MyClasses.FirstOrDefault(x => x.Id > 1);
        var count = db.MyClasses.Count();
        return View();
    }

}

编辑： 我试过var count = db.MyClasses.ToList（）。Count（）;但仍然返回零

Answer 1

使用此：

List<MyClasses> classList = db.MyClasses.ToList();
int count = classList.Count();

Answer 2

检查代码中的这一行

SET IDENTITY_INSERT **SqaCriterion** ON; //It should be **SqlCriterion**
insert into MyClass(Id, Criteria) values('1', 'Value1');
insert into MyClass(Id, Criteria) values('2', 'Value2');

实体框架行数始终为0

2 个答案: