Access LoginView Templated Controls with ASP 4.0 and C#

This tutorial we will demonstrate how to access ASP.NET controls located in the LoggedInTemplate of a LoginView Control from the C# code behind class.

Adding the LoginView Control
At this point in the tutorial I have created a new ASP.NET Empty Web Site and have added in a new blank Web Form named Default.aspx. What we need to do now is add a LoginView Control to the Web Form. To do this open up Default.aspx to Design mode and:

Expand the Login tab in your toolbox.
Drag and drop a LoginView Control on to the Web Form.

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Now that we have added the LoginView Control, we have the option of adding ASP.NET controls in either the AnonymousTemplate or the LoggedInTemplate appropriately. Either way, when you add a control to a template it goes out of the scope of our Default.aspx.cs code behind class. Let’s add some controls to the LoggedInTemplate and see what happens when we try to access them in C# from our code behind class. To do this:

Expand the LoginView tasks menu.

In the Views DropDownList, select LoggedInTemplate.
Drag and drop a Label into the editable area of the LoginView Control.
Drag and drop a Button into the editable area of the LoginView Control under the Label.

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Accessing Our Control
Right now we will leave the names of these controls default, Label1 and Button1. Normally, when you drop something onto a Web Form you can access the controls directly from the code behind class. However, with the controls in a template, this is not the case. To test this out open up the Default.aspx.cs code behind file and add in the following code to the Page_Load event method:

Label1.Text = "Hello World";

Notice, that intellisense immediately underlines Label1 and gives us an error that says ‘The name ‘Label1’ does not exist in the current context’.

This is a problem if we need to access this Label with C#. The way around this is to access it from the LoginView Control that we added earlier. To do this, get rid of the code we added earlier and open the Default.aspx back up to Design mode. Then double click the button we added earlier to generate a Click event method on that button. Then add the following code to that method:

((Label)LoginView1.FindControl("Label1")).Text = "Hello World";

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What this will do, is call the FindControl method of the LoginView and find the Label we added named Label1. Then, we will cast that as a Label type so that we can access the Text property of it and change that to 'Hello World’. Go ahead and load up the website and click the button to make sure that it works.

The Default.aspx source looks like this:

<body>
<formid="form1"runat="server">
<div>
<asp:LoginViewID="LoginView1"runat="server">
<LoggedInTemplate>

<asp:LabelID="Label1"runat="server"Text="Label"></asp:Label>
<br/>
<asp:ButtonID="Button1"runat="server"Text="Button"onclick="Button1_Click"/>

</LoggedInTemplate>
</asp:LoginView>
</div>
</form>
</body>

The Default.aspx.cs codebehind looks like this:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

publicpartialclass_Default : System.Web.UI.Page
{
protectedvoid Page_Load(object sender, EventArgs e)
    {
//How we would access the control outside of a template
//Label1.Text = "Hello World";
    }
protectedvoid Button1_Click(object sender, EventArgs e)
    {
//How we have to access it inside of the template
        ((Label)LoginView1.FindControl("Label1")).Text = "Hello World";
    }
}

本日志由 flyinweb 于 2011-07-15 09:07:37 发表，目前已经被浏览 3058 次，评论 2 次；

作者添加了以下标签： LoginView，Templated Controls；

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蜡笔小清

2011-07-16 00:16:38 | # | 回复

http://www.2mysite.net/scriptencoder/screnc.asp
站长你好，看到你有这个网页版加密的，比微软下载的screnc要方便些，不用到处都安装，呵呵。可以给源码我参考一下吗？我也是网站开发者，谢谢了，期待您的回复。我的邮箱是cs@mlmzj.com
flyinweb

2011-07-17 11:52:40 | # | 回复

@蜡笔小清已经发送到你QQ邮箱