asp.net代码 [英] asp.net code

问题描述

你好朋友
查看我的代码

Hello friends
Go through my code

Dim hrefSearch As New HyperLink
            hrefSearch = Page.FindControl("hrefAWSearch")
            hrefSearch.Attributes.Add("onclick", "javascript:MM_openBrWindow('AW_Search.aspx?ratecardid=" & Request.QueryString("ratecardid") & "','width=450,height=200')")

我正在尝试弹出子窗口，但错误是

I''m trying to PopUp child window, But error is

Object reference not set to an instance of an object.

任何解决方案，哪里出了问题?

Any solution, what is going wrong??

推荐答案

基于当前共享的代码，错误的潜在位置是:
hrefSearch = Page.FindControl("hrefAWSearch")
使用DEBUGGER并查看是否填充了 hrefSearch 对象.

此外，可能Request.QueryString("ratecardid")也未返回任何内容.您应该在使用前验证它们.

更新1:
在此行仔细查看:<asp:HyperLink id="hrefSearch" runat="server">

超链接ID: hrefSearch
您正在尝试将findcontrol用于ID:href AW Search
试试:
hrefSearch = Page.FindControl("hrefSearch")

Based on the current code shared, the potential place of the error is:
hrefSearch = Page.FindControl("hrefAWSearch")
Use DEBUGGER and see if hrefSearch object is populated or not.

Further, it might be that Request.QueryString("ratecardid") is also not returning anything. You should verify them before using.

UPDATE 1:
See closely at this line: <asp:HyperLink id="hrefSearch" runat="server">

Hyperlink ID: hrefSearch
You are trying to use findcontrol for id: hrefAWSearch
Try:
hrefSearch = Page.FindControl("hrefSearch")

最有可能的是，以下代码未能在Page中找到任何对象，因此返回了Null.

Most probably, the following code is failing to find any object in the Page and hence returning Null.

Page.FindControl("hrefAWSearch")

因此，您将在下一行获得Null异常.

尝试调试，以便使用正确的控件名称正确调用FindControl()方法.

希望这会有所帮助.

So, you are getting the Null Exception in the very next line.

Try debugging so that, the FindControl() method is invoked correctly with correct control name.

Hope, this helps.

这篇关于asp.net代码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！