C#:向其他类抛出异常

Question

这是我的插入数据类,我想在我的Windows窗体中显示异常错误,如消息框,我如何显示异常消息？

public void Insert()
{
        try
        {
        objcomm.Connection = objconn;
        objcomm.CommandText = "INSERT INTO goods VALUES(N'" + g_id + "',N'" + g_name + "',N'" + g_qty + "',N'" + b_price + "',N'" + s_price + "',N'" + l_qty + "',N'" + co_id + "')";
        objconn.Open();
        objcomm.ExecuteNonQuery();
        objconn.Close();
        }
        catch(Exception ex)
        {
        GeneralException ex1 = new GeneralException(Resource1.DBError, ex);
        throw ex1;
        }
}  

我想在消息框中抛出异常时显示"Resource1.DBError"消息:

public partial class WareForm : Form
{
        try
        {
            ware.Insert();
        }
        catch(IndexOutOfRangeException ex)
        {
            MessageBox.Show(ex.Message);
        }
 }

Answer 1

您需要捕获抛出的相同类型的异常:

    try
    {
        ware.Insert();
    }
    catch(GeneralException ex)
    {
        MessageBox.Show(ex.Message);
    }