C# 我如何在我的 ASP.NET 应用程序中为我的 ListView 使用 ItemCommand 事件
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How I use the ItemCommand Event for my ListView in my ASP.NET Application
提问by Tarasov
I have a ASP.NET Application with a ListView. In every Row in my ListView I have a LinkButton that open a new webform "Benutzer.aspx". my Problem is that I don't get the Index of this Row. I use the ItemCommand Event but it not work :(
我有一个带有 ListView 的 ASP.NET 应用程序。在我的 ListView 的每一行中，我都有一个 LinkButton，它打开一个新的网络表单“Benutzer.aspx”。我的问题是我没有得到这一行的索引。我使用了 ItemCommand 事件，但它不起作用:(
Here my Code:
这是我的代码：
ASPX:
ASPX：
...
<ItemTemplate>
<tr runat="server">
<td align="left" ><asp:Label ID="Label1" Text='<%# Eval("Benutzer") %>' runat="server" /></td>
<td align="left"><asp:Label ID="Label2" Text='<%# Eval("eMail") %>' runat="server" /></td>
<td align="left"><asp:Label ID="Label3" Text='<%# Eval("Vorname") %>' runat="server" /></td>
<td align="left"><asp:Label ID="Label4" Text='<%# Eval("Nachname") %>' runat="server" /></td>
<td align="left"><asp:Label ID="Label5" Text='<%# Eval("Telefon") %>' runat="server" /></td>
<td align="left"><asp:LinkButton runat="server" Text="Anzeigen" CommandName="Anzeigen" OnCommand="ListView1_ItemCommand" CommandArgument="myArguments"></asp:LinkButton></td>
</tr>
</ItemTemplate>
...
cs file:
cs文件：
...
protected void ListView1_ItemCommand(object sender, ListViewCommandEventArgs e)
{
if (e.CommandName == "Anzeigen")
{
Label lbText = (Label)e.Item.FindControl("Label2");
string email = lbText.Text;
Session["email"] = email;
Response.Redirect("Benutzer.aspx");
}
}
...
What is the matter :(
有什么事 ：（
tarasov
塔拉索夫
采纳答案by Ibrahem Ahmed Shehata
Try this:
尝试这个：
First you need to have the index of the button. So in the html code add this in the CommandArgument of the button to get the index:
首先你需要有按钮的索引。因此，在 html 代码中，在按钮的 CommandArgument 中添加以下内容以获取索引：
CommandArgument='<%# Container.DataItemIndex %>'
Then in the codebehind:
然后在代码隐藏中：
if (e.CommandName == "Anzeigen")
{
Label lbText = ListView1.Item[e.CommandArgument].FindControl("Label2");
string email = lbText.Text;
Session["email"] = email;
Response.Redirect("Benutzer.aspx");
}
Hope I Helped
希望我有所帮助
回答by Jupaol
You cannot find the control because it is contained in the child control collection of another server control:
您找不到该控件，因为它包含在另一个服务器控件的子控件集合中：
<tr runat="server">
You need to try to find the control recursively:
您需要尝试递归查找控件：
Take a look
看一看
Better way to find control in ASP.NET
Or you can use this extension method:
或者您可以使用此扩展方法：
public static class ControlExtensions
{
public static Control FindControlRecursively(this Control control, string targetControlID)
{
if (control == null)
{
return null;
}
var ctrl = control.FindControl(targetControlID);
if (ctrl == null)
{
foreach (Control child in control.Controls)
{
ctrl = FindControlRecursively(child, targetControlID);
if (ctrl != null)
{
break;
}
}
}
return ctrl;
}
}
Usage:
用法：
var ctrl = e.Item.FindControlRecursively("your control ID");
回答by Ratheesh Raveendran Pillai
The code you have furnished is simply fine... "just remove the 'CommandArgument' from your listview property , bcoz..its already have the dataindex you are looking for. By specifying a command argument you are overriding the default one. So just remove the command argument and your code will work fine... :)
您提供的代码非常好......“只需从您的列表视图属性中删除'CommandArgument'，bcoz ..它已经拥有您正在寻找的数据索引。通过指定一个命令参数，您将覆盖默认参数。所以只需删除命令参数，您的代码将正常工作... :)
回答by SMHasnain
I am a VB programmer Check this method may b it gives you some idea
我是一名 VB 程序员 检查此方法可能会为您提供一些想法
after binding the list with datasource, In the itemCommand do this
将列表与数据源绑定后，在 itemCommand 中执行此操作
Dim <sometext> As Label = TryCast(e.Item.FindControl("Anzeigen"), Label)
If e.CommandName = "Anzeigen" Then
'do what ever you like
'also you can use <sometext> if you want to extract data from list
'simply use <sometext>.<whatproperty>, you can also store it in sessions like the email you are using.
Session("email") = email
Response.Redirect("Benutzer.aspx");
End If
let me know if it helps you solve your problem.
如果它可以帮助您解决问题，请告诉我。
回答by user1684037
This is the HTML, then build the OnItemCommand.
这是 HTML，然后构建OnItemCommand.
<asp:ListView ID="lvFiles" runat="server" DataKeyNames="FileName" OnItemCommand="lvFiles_ItemCommand">
<ItemTemplate>
<tr runat="server">
<td style="width:80px">
<asp:LinkButton runat="server"
ID="SelectEmployeeButton"
Text="Download File"
CommandName='<%#Eval("FileName")%>'
CommandArgument='<%#Eval("FileName")%>' />
</td>
</tr>
</ItemTemplate>
</asp:ListView>
Here is the code behind...
这是背后的代码......
protected void lvFiles_ItemCommand(object sender, ListViewCommandEventArgs e)
{
string v = e.CommandArgument.ToString();
}
