asp.net - Web表单中的错误处理

Question

我正在尝试解决我的数据访问层中的错误，该错误将返回值-1的int。见下文:

protected void FolderBtn_Click(object sender, EventArgs e)
{
    if (Page.IsValid)
    {
        try
        {
            DocsDALC dalc = new DocsDALC();

            // Updating two tables here - Folders and FolderAccess tables 
            // - as an ADO.NET transaction
            int folderID = dalc.CreateFolder(...);

            if (folderID > 0)
            {
                Response.Redirect(Request.Url.ToString(), false); 
                // Re-construct this to include newly-created folderID 
            }
            else
            {
                // How do I throw error from here?
            }
        }
        catch (Exception ex)
        {
            HandleErrors(ex);
        }
    }
}

如果数据层返回-1，如何从try块中引发错误？

Answer 1

如下所示-但是，由于您正在捕获错误，因此，如果知道这是一个问题，最好调用HandleErrors方法的重载，该方法可以传入定义问题的字符串，而不是抛出异常(这样做会很昂贵)。

如果仍然要抛出异常:

        if (folderID > 0)
        {
            Response.Redirect(Request.Url.ToString(), false); 
            // Re-construct this to include newly-created folderID 
        }
        else
        {
            throw new Exception("Database returned -1 from CreateFolder method");
        }

可能的替代方法:

        if (folderID > 0)
        {
            Response.Redirect(Request.Url.ToString(), false); 
            // Re-construct this to include newly-created folderID 
        }
        else
        {
            HandleErrors("Database returned -1 from CreateFolder method");
        }

当然有了重载的HandleErrors方法。