如何从ADO.NET调用TSQL函数

唯一的区别是必须为返回值添加一个特殊参数

见: MySqlCommand call function

  using (var connection = new SqlConnection("ConnectionString"))
  using (var command = connection.CreateCommand())
  {
    command.CommandType = CommandType.StoredProcedure;
    command.CommandText = "MyFunction";

    SqlParameter returnValue = command.Parameters.Add("@RETURN_VALUE", SqlDbType.Int);
    returnValue.Direction = ParameterDirection.ReturnValue;

    connection.Open();
    command.ExecuteNonQuery();

    return returnValue.Value;
  }