ASP.Net/C#,循环浏览页面上的某些控件？

Question

我正在循环浏览页面上的所有控件,并在某些条件下将某些类型(TextBox,CheckBox,DropDownList等)设置为Enabled = False.但是我注意到这样一个明显的页面加载循环增加.是否有可能只从Page.Controls对象获取某些类型的控件而不是循环遍历它们？可能是像LINQ这样的东西？

Answer 1

这不能完全使用LINQ完成,但您可以使用这样定义的扩展

static class ControlExtension
    {
        public static IEnumerable<Control> GetAllControls(this Control parent)
        {
            foreach (Control control in parent.Controls)
            {
                yield return control;
                foreach (Control descendant in control.GetAllControls())
                {
                    yield return descendant;
                }
            }
        }
    }

并打电话

this.GetAllControls().OfType<TextBox>().ToList().ForEach(t => t.Enabled = false);

Answer 2

你可以循环遍历所有控件(嵌套的控件):

private void SetEnableControls(Control page, bool enable)
{
    foreach (Control ctrl in page.Controls)
    {
        // not sure exactly which controls you want to affect so just doing TextBox
        // in this example.  You could just try testing for 'WebControl' which has
        // the Enabled property.
        if (ctrl is TextBox)
        {
            ((TextBox)(ctrl)).Enabled = enable; 
        }

        // You could do this in an else but incase you want to affect controls
        // like Panels, you could check every control for nested controls
        if (ctrl.Controls.Count > 0)
        {
            // Use recursion to find all nested controls
            SetEnableControls(ctrl, enable);
        }
    }
}

然后使用以下内容初始调用它以禁用:

SetEnableControls(this.Page, false);