Linq总是迷住我。我试图从ASP.Net表单页面中提取所有控件,其中控件的ID包含特定的字符串。控件集合是分层的,我想从所有级别返回所有匹配的控件。我在球场的任何地方吗?我真的可以使用一些帮助/教育。 collection参数是页面中控件的集合,controlID是我要搜索的文本。
public static Control FindControlsByControlID(ControlCollection collection, string controlID)
{
IEnumerable<Control> controls = collection.Cast<Control>();
IEnumerable<Control> matchedControls = controls
.SelectMany(p => p.Controls.Cast<Control>()
.SelectMany(c => c.Controls.Cast<Control>())
.Where(d => d != null ? d.ID != null ? d.ID.Contains(controlID) : false : false))
.Where(a => a != null ? a.ID != null ? a.ID.Contains(controlID) : false : false);
ConcurrentQueue<Control> cq;
if (matchedControls != null)
cq = new ConcurrentQueue<Control>(matchedControls);
else
return null;
...
提前感谢!
使用扩展方法来获取所有子控件:
public static class ControlExt {
public static IEnumerable<Control> AndSubControls(this Control aControl) {
var work = new Queue<Control>();
work.Enqueue(aControl);
while (work.Count > 0) {
var c = work.Dequeue();
yield return c;
foreach (var sc in c.Controls.Cast<Control>()) {
yield return sc;
if (sc.Controls.Count > 0)
work.Enqueue(sc);
}
}
}
}
现在您可以测试ControlCollection
中的所有子控件:
IEnumerable<Control> matchedControls = controls.SelectMany(c => c.AndSubControls())
.Where(a => a != null && a.Name != null && a.Name.Contains(controlID));