我需要有关获取用户cotrol火事件的帮助 [英] i need help about get user cotrol fire event

问题描述

几周前，我发现文章使用的是Visual Basic语言，以及有关创建和删除动态webusercontrol的信息，我在此发送此信息是因为我的问题是关于C#语法的，而不仅仅是asp.net问题

few weekd ago i find article was in visual basic language and its about create and delete dynamic webusercontrol , i sent this post here because my problem is about C# syntax , not just asp.net problem

检查VB代码的这一部分

check this part of VB code

Sub HandleRemoveUserControl(ByVal sender As Object, ByVal e As EventArgs)
    'This handles delete event fired from the user control

    'Get the user control that fired this event, and remove it
    Dim DynamicUserControl As WebUserControl = sender.parent
    ph1.Controls.Remove(sender.parent)

    'Keep a pipe delimited list of which user controls 
    'were removed. This will increase the 
    'viewstate size if the user keeps removing 
    'dynamic controls, but under normal use
    'this is such a small increase in size that it shouldn't be an issue.
    ltlRemoved.Text &= DynamicUserControl.ID & "|"

    'Also, now that we've removed a user control decrement 
    'the count of total user controls on the page
    ltlCount.Text = Convert.ToInt16(ltlCount.Text) - 1
  End Sub

推荐答案

这不是C#问题.有几种可能的原因:

This isn't a C# problem. There are a few possible causes:

1. 有时会在没有发送方的情况下调用此事件(即sender == null)
2. ph1为null(什么样的对象是ph1，它在哪里声明的?)
3. sender是像窗体一样的父级控件，它本身没有父级(sender.parent == null)

1. This event is sometimes called without a sender (i.e. sender == null)
2. ph1 is null (what kind of object is ph1, and where is it declared?)
3. sender is a parent-level control like a form, which doesn't have a parent itself (sender.parent == null)

这篇关于我需要有关获取用户cotrol火事件的帮助的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！