如何在转发器的按钮单击事件处理程序中获取绑定对象？

发布于 2024-12-22 00:38:39 字数 418 浏览 1 评论 0原文

我有一个中继器，并将一个对象列表绑定到它，如下所示：

List<MyClass> myList = //....
MyRepeater.DataSource = myList;
MyRepeater.DataBind();

在中继器内部，我有一个由该处理程序处理的链接按钮：

protected void Button_ItemCommand(object source, RepeaterCommandEventArgs e) {
    if (e.CommandName == "Edit") {
        // I need to get my listItem.Id here
    }
}

它应该很容易，但我找不到如何做到这一点。

谢谢。

原文

I have a repeater and bind a list of objects to it, like this:

List<MyClass> myList = //....
MyRepeater.DataSource = myList;
MyRepeater.DataBind();

Inside the repeater I have a link button which is handled by this handler:

protected void Button_ItemCommand(object source, RepeaterCommandEventArgs e) {
    if (e.CommandName == "Edit") {
        // I need to get my listItem.Id here
    }
}

It should be easy but I can't find how to do it.

Thanks.

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玉环 2024-12-29 00:38:39

如果您想要单击的实际链接按钮，该按钮已在对象源 参数中传递给此方法，只需对其进行适当的转换即可。

LinkButton lb = source as LinkButton;

如果您想要中继器中的其他控件，您可以使用

Button randomButton = e.Item.FindControl("buttonId") as Button;

EDIT

如果您想要此行绑定到的对象的属性，这将是一个痛苦的事情，而且会很难看。您需要在会话或视图状态中跨回发保留转发器绑定到的数据源。完成此操作后，您可以通过将其索引与单击的中继器行的索引相匹配来访问源中适当的对象，您可以通过以下方式获取该对象：

e.Item.ItemIndex

请注意，最简单的方法是将此值存储在某处在你的中继器中。

If you want the actual link button that was clicked, that's already being passed to this method in the object source parameter—just cast it appropriately.

LinkButton lb = source as LinkButton;

If you want some other control that's in your repeater, you can use

Button randomButton = e.Item.FindControl("buttonId") as Button;

EDIT

If you want a property from the object this row is bound to, this will be a pain to do, and it'll be ugly. You'll need to persist the DataSource the repeater is bound to across postbacks, either in Session or ViewState. Once you do that, you can access the appropriate object in the source by matching its index with the index of the reeater's row that was clicked, which you can get by:

e.Item.ItemIndex

Note that the easiest way is to just store this value somewhere in your repeater.

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坚持沉默 2024-12-29 00:38:39

大多数时候，从存储/缓存/等中获取绑定对象很容易。如果您有身份证件。既然您在问题中说“我需要在此处获取我的 listItem.Id”，我认为您不介意重新获取对象本身，而只是寻找一种仅获取标识符的方法从中继器。

只需给按钮一个命令参数，如下所示：

<asp:LinkButton runat="server" ID="lnkEdit" CommandName="Edit"
  CommandArgument='<%# Eval("ID") %>'>Edit</asp:LinkButton>

然后就像您在问题中正确所说的那样，

protected void Button_ItemCommand(object source, RepeaterCommandEventArgs e) {
  if (e.CommandName == "Edit") {
    // I need to get my listItem.Id here
    RenderEditDialog(FetchFromStorage(e.CommandArgument.ToString());
  }
}

Most of the time it's easy to fetch the bound object from your storage/cache/etc. if you have the ID. Since you said in your question "I need to get my listItem.Id here", I think you don't mind re-fetching the object itself and are just looking for a way to get only the identifier from the repeater.

Just give the button a command argument as shown:

<asp:LinkButton runat="server" ID="lnkEdit" CommandName="Edit"
  CommandArgument='<%# Eval("ID") %>'>Edit</asp:LinkButton>

Then like you rightly said in your question,

protected void Button_ItemCommand(object source, RepeaterCommandEventArgs e) {
  if (e.CommandName == "Edit") {
    // I need to get my listItem.Id here
    RenderEditDialog(FetchFromStorage(e.CommandArgument.ToString());
  }
}

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空气里的味道 2024-12-29 00:38:39

你不能这样做。 ASP.Net 不会在回发过程中保留原始数据绑定对象。您必须将要保留的数据存储在中继器内的控件中。然后您可以通过 EventArgs 访问该控件，例如

e.Item.FindControl("myControl");

You cannot do this. The original databound object is not persisted by ASP.Net across postbacks. You have to store the data you want to keep in a control inside the repeater. You can then access the control via the EventArgs, e.g.