SqlCommand 的 In-Out 参数 [英] In-Out Parameter for SqlCommand

问题描述

I have the following parameter for SqlCommand. How do I make it to both in and out the paramter value for the Stored Procedure.

 SqlCommand mySqlCommand = new SqlCommand("aspInsertZipCode", mySqlConnection);
 mySqlCommand.CommandType = CommandType.StoredProcedure;
 mySqlCommand.Parameters.Add("@DataRows", dataStringToProcess.ToString());

解决方案

var pInOut = mySqlCommand.Parameters.Add("@DataRows", dataStringToProcess.ToString());
pInOut.Direction = ParameterDirection.InputOutput;

And then to read the output value after you've executed the command:

// assumes that the parameter is a string and that it could possibly be null
string value = Convert.IsDBNull(pInOut.Value) ? null : (string)pInOut.Value;

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