实体框架 - SaveChanges 异常

Question

我有这段代码保存了一个简单的实体：

ExecutionEngineEntities db = new ExecutionEngineEntities();
Task task = new Task();
task.Message = "Test";
task.Result = "Test";
task.Name = "Test";
db.Tasks.AddObject(task);
db.SaveChanges();

这是个例外：

A first chance exception of type 'System.Data.UpdateException' occurred in System.Data.Entity.dll
Unable to update the EntitySet 'Tasks' because it has a DefiningQuery and no <InsertFunction> element exists in the <ModificationFunctionMapping> element to support the current operation.
The program '[6092] WebDev.WebServer40.EXE: Managed (v4.0.30319)' has exited with code 0 (0x0).

这是建表代码：

CREATE TABLE [dbo].[Tasks](
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [Name] [nchar](50) NULL,
    [Message] [nchar](1000) NULL,
    [Result] [nchar](1000) NULL
) ON [PRIMARY]

谷歌搜索后发现出现此错误的模式人有关系问题，这不是我的情况

谢谢

Answer 1

或许这里的答案可以帮到你：It has a DefiningQuery but no InsertFunction element... err

可能是在 EF 模型中配置此实体是视图而不是表。视图不支持创建、更新或删除操作，因此无法插入。