用户控件中使用的asp.net自定义控件(ascx) - 如何捕获加载错误?

时间:2013-03-06 15:42:15

标签: asp.net .net exception-handling custom-controls

我有一个放在用户控件(ascx)上的自定义控件。在自定义控件的加载中发生错误。我想在用户控件(ascx)中“捕获”此错误。我怎么能这样做?

默认aspx:

<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="Default.aspx.vb" Inherits="WebApplication1._Default" %>
<%@ Register src="WebUserControl1.ascx" tagname="WebUserControl1" tagprefix="uc1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server"><title></title></head>
<body><form id="form1" runat="server">
        <asp:Label runat="server" ID="test" Text="hello world"></asp:Label>
        <uc1:WebUserControl1 ID="WebUserControl11" runat="server" />
</form></body></html>

WebUserControl1.ascx:

<%@ Control Language="vb" AutoEventWireup="false" CodeBehind="WebUserControl1.ascx.vb" Inherits="WebApplication1.WebUserControl1" %>
<%@ Register tagPrefix="test" namespace="WebApplication1" assembly="WebApplication1" %>
<test:MyControl runat="server" ID="test2" Text="test"></test:MyControl>

WebUserControl1.ascx.vb:

Public Class WebUserControl1
    Inherits System.Web.UI.UserControl


    Protected Overrides Sub OnLoad(ByVal e As System.EventArgs)
        Try
            'Doesn't work!
            MyBase.OnLoad(e)
        Catch ex As Exception
            handleException(ex)
        End Try
    End Sub
    Private Sub Page_Error(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Error
        'Doesn't work!
        handleException(New Exception())
    End Sub
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
   End Sub

    Private Sub handleException(ByVal ex As Exception)
        Me.Controls.Add(New LiteralControl("ex.tostring"))
    End Sub
End Class

最后但并非最不重要:我的自定义控件:

MyControl.vb:

Public Class MyControl
    Inherits System.Web.UI.WebControls.Label

    Protected Overrides Sub OnLoad(ByVal e As System.EventArgs)
        Throw New Exception("")
        MyBase.OnLoad(e)
    End Sub
End Class

我希望能够捕获此错误,在* .ascx文件中这似乎不可能?或者是吗?

1 个答案:

答案 0 :(得分:0)

您无法拦截父控件中OnLoadOnInitOnPreRender等事件中引发的异常。

您可以尝试通过附加到Page.Error事件在Page / UserControl中执行此操作。

更好的选择是在global.asax事件处理程序的Application_Error文件中添加全局错误处理程序。