Question

我编写的程序选择并应该根据ID从gridview中删除一行，但它会抛出一个异常，@ComplainantTypeID没有提供给存储过程，但我检查了调试，它发送了增加价值，但它仍然会引发异常。

代码：

protected void btnDeletePopUp_Click(object sender, EventArgs e)
{
        try
        {
            int ComplainantTypeID = Convert.ToInt32(txtSelectedID.Text.Trim());
            ManageComplainantType mngComplainantType = new ManageComplainantType();
            mngComplainantType.Delete(ComplainantTypeID);
            Clear(txtName, txtSelectedID);
            HiddenFieldSetMessage.Value = "Delete";
            HiddenFieldShowMessage.Value = "True";
        }
        catch (Exception)
        {
            HiddenFieldSetMessage.Value = "NotDeleted";
            HiddenFieldShowMessage.Value = "True";
        }
    }

BLL中的删除功能：

public void Delete(int ComplainantTypeID)
{
            SqlCommand cmd = new SqlCommand("DeleteComplainantTypes_SP", DataBaseConnection.OpenConnection());
            cmd.CommandType = CommandType.StoredProcedure;
            SqlParameter pComplainantTypeID = new SqlParameter("@ComplainantTypeID", ComplainantTypeID);
            cmd.Parameters.Add(pComplainantTypeID);
            cmd.ExecuteNonQuery();
            DataBaseConnection.CloseConnection();
}

存储过程：

PROCEDURE [dbo].[DeleteComplainantTypes_SP]
    @ComplainantTypeID smallint
AS
BEGIN
   BEGIN TRY
       DELETE FROM ComplainantTypes WHERE ComplainantTypeID = @ComplainantTypeID
   END TRY
   BEGIN CATCH
       SELECT ERROR_MESSAGE() AS ErrorMessage
   END CATCH
END

Answer 1

您必须显示异常以获得更好的帮助，但问题实际上是数据类型。您通过int但预期smallint。查看SQL Server Data Type Mappings文章以选择适当的数据类型。

<强>更新

你无法将int转换为smallint，你必须传递short类型的参数，该参数映射到smallint sql类型。

声明

public void Delete(short ComplainantTypeID)

而不是

public void Delete(int ComplainantTypeID)

并保持SP不变。

Answer 2

尝试

cmd.Parameters.AddWithValue("@ComplainantTypeID", value);

或

SqlParameter pComplainantTypeID = new SqlParameter("@ComplainantTypeID",SqlDbType.SmallInt,value);

Answer 3

试试这个

 sqlCommand.Parameters.Add("@ComplainantTypeID", SqlDbType.Int).Value = ComplainantTypeID;

程序不会将参数发送到存储过程

3 个答案: