ASP.NET 查找页面上的所有控件并隐藏它们

发布于 2024-10-16 06:39:52 字数 308 浏览 6 评论 0原文

我试图在 Page_Load 上隐藏我所有的 RadioButtonLists 但我似乎无法完全正确地使用语法

我猜我必须使用像这样的 FindControl 语法

CType(FindControl, RadioButtonList)

然后我'我猜我必须循环遍历每个 RadioButtonList 并在其上设置 Visible = False 属性。

我似乎在上面的代码中遇到了错误。

我可以尝试什么想法吗？

谢谢

原文

I'm trying to on Page_Load hide all my RadioButtonLists but I can't seem to get the syntax quite right

I'm guessing I've got to use the FindControl syntax something like this

CType(FindControl, RadioButtonList)

And then I'm guessing I will have to loop through each RadioButtonList and set the Visible = False attribute on it.

I seem to be getting an error with the code above.

Any ideas what I can try?

Thanks

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栖迟 2024-10-23 06:39:53

试试这个：

protected void Page_Load(object sender, EventArgs e)
{
    HideRadioButtonLists(Page.Controls);
}

private void HideRadioButtonLists(ControlCollection controls)
{
    foreach (WebControl control in controls.OfType<WebControl>())
    {
        if (control is RadioButtonList)
            control.Visible = false;
        else if (control.HasControls())
            HideRadioButtonLists(control.Controls);
    }
}

Try this:

protected void Page_Load(object sender, EventArgs e)
{
    HideRadioButtonLists(Page.Controls);
}

private void HideRadioButtonLists(ControlCollection controls)
{
    foreach (WebControl control in controls.OfType<WebControl>())
    {
        if (control is RadioButtonList)
            control.Visible = false;
        else if (control.HasControls())
            HideRadioButtonLists(control.Controls);
    }
}

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挽心 2024-10-23 06:39:53

FindControl 仅在您知道要查找的控件的名称时才有效，而且它不是递归调用。除非您能保证您的控件位于您正在搜索的特定容器中，否则您将找不到它。如果要查找所有单选按钮列表，则需要编写一个方法，循环遍历父/子关系中的所有控件集，并将单选按钮列表可见设置为 false。

只需将 Page.Controls 传递给此函数（未经测试，可能需要调整）：

public void HideRadioButtonLists(System.Web.UI.ControlCollection controls)
{
    foreach(Control ctrl in controls)
    {
        if(ctrl.Controls.Count > 0) HideRadioButtonLists(ctrl.Controls);
        if("RadioButtonList".Equals(ctrl.GetType().Name, StringComparison.OrdinalIgnoreCase))
            ((RadioButtonList)ctrl).Visible = false;
    }
}

FindControl only works if you know the name of the control you're looking for, and more than that it is not a recursive call. Unless you can guarantee that your control will be in the specific container you're searching in, you won't find it. If you want to find all of the radiobutton lists, you'll need to write a method that cycles through all control sets in the parent/child relationship and sets the radiobuttonlist visible to false.

Just pass Page.Controls to this function (untested, may need tweaking):

public void HideRadioButtonLists(System.Web.UI.ControlCollection controls)
{
    foreach(Control ctrl in controls)
    {
        if(ctrl.Controls.Count > 0) HideRadioButtonLists(ctrl.Controls);
        if("RadioButtonList".Equals(ctrl.GetType().Name, StringComparison.OrdinalIgnoreCase))
            ((RadioButtonList)ctrl).Visible = false;
    }
}

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