有没有办法在C＃中同时具有输入和输出的存储过程参数？

Question

I'm re-writing a program which was developed in Delphi and I want to code it into C#. The old developer has used a stored procedure which I want to use it like the old version. In the SP's parameters, there are some output parameters but one of those in which has been used as an input parameter too. So I've to set a value to it and also get the output value.

I tried to code like this:

int MyValue = 4;
SqlCommand MyCom = new SqlCommand();
MyCom.Connection = (SomeConnectionObject);
MyCom.CommandType = CommandType.StoredProcedure;
MyCom.CommandText = "MySP";

MyCom.Parameters.AddWithValue("@Parameter1_Output", MyValue);
MyCom.Parameters["@Parameter1_Output"].Direction = ParameterDirection.Output;

In the executed query (Profiler) value set to the parameter is 0 while I have set it to 4.

Answer 1

Well, if we have a look at ParameterDirection enum we'll find

Fields

...

InputOutput 3 The parameter is capable of both input and output .

(italic is mine). That's why

MyCom.Parameters["@Parameter1_Output"].Direction = ParameterDirection.InputOutput;