实体框架 - 使用默认参数调用存储过程

Question

I have some stored procedures mapped in Entity Framework using Database First. It creates strongly typed methods that you can call to run the stored procedures. I've run into a significant problem, however, in that I don't see any way to call these methods it created with the default parameters defined in the stored procedures. This means:

a) I have to manually add the default parameters to the method calls, which is brittle, if the default parameter value were to ever change.

b) Write method overloads by hand. This basically eliminates the benefit of generating a model from the database in the first place.

Does anyone know if there is a better solution to this problem?

Thanks.

Answer 1

As of Jan 2013, there's no supported way to do have the Entity Framework do this.

I have opened a feature request here .

Answer 2

Here's a hacky workaround. I don't know if there's a feature in EF to support optional parameters, but you can try to emulate it - if you're willing to change the stored procedures.

You can change the default value in the definition of the stored procedure to NULL , and then in the body of the procedure, replace NULL parameters with the desired default value. Then from the code using EF you could pass null to indicate using the default. This way at least the default is only defined in the SP itself.

Drawbacks include of course that now NULL becomes an "out-of-band" value, meaning you can't actually pass it to the SP if that's what you need (besides having to change your SPs and ensuring all future ones use this weird convention)