c# - 必须声明标量变量 “@Login” 。尝试向 SqlDataSource 添加参数时出错

Question

我有这个错误:必须声明标量变量“@Login”。

我的代码:

using (SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["intranetv2"].ConnectionString))
{

    SqlCommand cmd = new SqlCommand("insert into [MyBase].[Dbo].[LogErrors] (Username, StackTrace, ShortDescription, DetailDescription, ErrorType) VALUES (@Login, @Stack, @Message, @Txt, @Source)", conn);

                SqlParameter param = new SqlParameter();
                param.ParameterName = "Login";
                param.Value = user.Login;
                param.ParameterName = "Stack";
                param.Value = ex.StackTrace;
                param.ParameterName = "Message";
                param.Value = ex.Message;
                param.ParameterName = "Txt";
                param.Value = Txt;
                param.ParameterName = "Source";
                param.Value = ex.Source;
                // 3. add new parameter to command object
                cmd.Parameters.Add(param);
                conn.Open();
                return cmd.ExecuteNonQuery();
}

我尝试在参数中使用'@'，但我有同样的错误。

Answer 1

您必须为每个参数创建一个新的 SqlParameter，它应该是这样的:

using (SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["intranetv2"].ConnectionString))
{

    SqlCommand cmd = new SqlCommand("insert into [MyBase].[Dbo].[LogErrors] (Username, StackTrace, ShortDescription, DetailDescription, ErrorType) VALUES (@Login, @Stack, @Message, @Txt, @Source)", conn);

                SqlParameter param = new SqlParameter();
                param.ParameterName = "@Login";
                param.Value = user.Login;
                cmd.Parameters.Add(param);

                SqlParameter param2 = new SqlParameter();
                param2.ParameterName = "@Stack";
                param2.Value = ex.StackTrace;
                cmd.Parameters.Add(param2);
    (...)