1. 您需要将存储过程导入为函数.右键单击实体模型的工作区，然后选择 Add->.函数导入.
2. 在添加函数导入"对话框中，输入要在模型中引用存储过程的名称，例如 GetCountryListSP ，从下拉列表中选择过程，然后选择返回值该过程的名称为实体，然后从下拉列表中选择 CountryName .

3. 然后在代码中:

1. You need to Import the stored procedure as a Function. Right-click on the workspace area of your Entity model and choose Add -> Function Import.
2. In the Add Function Import dialog, enter the name you want your stored procedure to be referred to in your model for example GetCountryListSP, choose your procedure from the drop down list, and choose the return value of the procedure to be Entities and choose CountryName from the drop down list.

3. Then in the code:

var result = db.GetCountryListSP();//Send parameters too

使用这种方法，可以防止返回存储过程的 -1 .请查看这篇帖子，以获取有关存储过程问题的更多详细信息实体框架.

With this approach you prevent returning -1 of the stored procedure. Please check this post for more details about stored procedure problem with Entity Framework.