【C#】【MySQL】C#获取存储过程的Output输出参数值

创建存储过程

Create PROCEDURE MYSQL
   @a int,
   @b int,
   @c int output
AS
   Set @c = @a + @b
GO

通过以下方法可以获得储存过程的输出参数

SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["LocalSqlServer"].ToString());
conn.Open();
SqlCommand MyCommand = new SqlCommand("MYSQL", conn);
MyCommand.CommandType = CommandType.StoredProcedure;
MyCommand.Parameters.Add(new SqlParameter("@a", SqlDbType.Int));
MyCommand.Parameters["@a"].Value = 20;
MyCommand.Parameters.Add(new SqlParameter("@b", SqlDbType.Int));
MyCommand.Parameters["@b"].Value = 20;
MyCommand.Parameters.Add(new SqlParameter("@c", SqlDbType.Int));
MyCommand.Parameters["@c"].Direction = ParameterDirection.Output;
MyCommand.ExecuteNonQuery();
MessageBox.Show(MyCommand.Parameters["@c"].Value.ToString());