从存储过程返回值

我试图从我的存储过程返回数据。 这就是我所尝试过的，绝对没有回头路。

存储过程：

Declare @Submit_ID as int Set @Submit_ID = (Select (Max(Sub_ID) + 1) from Sub_Details); INSERT INTO..... Return @Submit_ID 

C＃（2.0）

 SqlConnection conn = null; int subid; try { conn = new SqlConnection(conn_string); SqlCommand cmd = new SqlCommand("INSERT_INTO_MYDB", conn); cmd.CommandType = CommandType.StoredProcedure; SqlParameter p1 = new SqlParameter("@FirstName", SqlDbType.NVarChar, 255); p1.Direction = ParameterDirection.Input; p1.Value = txtFirstName.Text; cmd.Parameters.Add(p1); SqlParameter p2 = new SqlParameter("@LastName", SqlDbType.NVarChar, 255); p2.Direction = ParameterDirection.Input; p2.Value = txtLastName.Text; cmd.Parameters.Add(p2); SqlParameter pSub = new SqlParameter("@Sub_ID", SqlDbType.Int); pSub.Direction = ParameterDirection.ReturnValue; conn.Open(); cmd.ExecuteNonQuery(); subid = Convert.ToInt32(pSub); } 

Answer 1

首先将参数添加到cmd并将.Value用于其值

  cmd.Parameters.Add(pSub); // add parameters to command cmd.ExecuteNonQuery(); subid = Convert.ToInt32(pSub.Value); // Use .Value 

Answer 2

您没有将return参数添加到命令：

 SqlParameter pSub = new SqlParameter("@Sub_ID", SqlDbType.Int); pSub.Direction = ParameterDirection.ReturnValue; cmd.Parameters.Add(pSub); // <------------- add to command conn.Open(); cmd.ExecuteNonQuery(); subid = Convert.ToInt32(cmd.Parameters["pSub"].Value);