如何禁用 ASP.NET 页面中的所有控件?

How do I disable all controls in ASP.NET page?(如何禁用 ASP.NET 页面中的所有控件?)

问题描述

我在一个页面中有多个下拉列表，如果用户选择一个复选框，该复选框显示禁用所有，我想禁用所有.到目前为止，我有这段代码，但它不起作用.有什么建议吗?

I have multiple dropdownlist in a page and would like to disable all if user selects a checkbox which reads disable all. So far I have this code and it is not working. Any suggestions?

foreach (Control c in this.Page.Controls)
{
    if (c is DropDownList)
        ((DropDownList)(c)).Enabled = false;
}

推荐答案

每个控件都有子控件，所以你需要使用递归来访问它们:

Each control has child controls, so you'd need to use recursion to reach them all:

protected void DisableControls(Control parent, bool State) {
    foreach(Control c in parent.Controls) {
        if (c is DropDownList) {
            ((DropDownList)(c)).Enabled = State;
        }

        DisableControls(c, State);
    }
}

然后这样称呼它:

protected void Event_Name(...) {
    DisableControls(Page,false); // use whatever top-most control has all the dropdowns or just the page control
} // divs, tables etc. can be called through adding runat="server" property

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