C# 如何插入odata edm？

c#客户端应用程序正在通过服务引用访问web api 2 odata控制器。你怎么做插入？此代码不起作用：

 CourseServiceRef.Container container1;
 CourseServiceRef.NotNeeded notNeeded;

 notNeeded.Username1 = "test";
 notNeeded.Email = "test";           
 var serviceResponse = container1.SaveChanges();

---

服务引用称为CourseServiceRef。它包含一个名为NotNeeded的实体集。使用实体框架6.1以防有人发现有用：

 Uri uri = new Uri("http://localhost:50222/odata");
         var container = new CourseServiceRef.Container(uri);
         CourseServiceRef.NotNeeded newTempAccount = new CourseServiceRef.NotNeeded()
            { 
               Email = model.UserName,
               Username1 = model.UserName 
            };

         if (newTempAccount != null)
        {
            container.AddToNotNeededs(newTempAccount);
            container.SaveChanges();
        }