如何通过id在页面上找到控件

Question

Is there a simple way to find a control in ASP.NET by id (in any nested container)? Other than traversing whole controls tree.

Something like this example:

TextBox tb = new TextBox() { ID = "textboxId"};
panel3.Controls.Add(tb);

And in other method/class:

 TextBox nameTextbox = MethodToFindControl("textboxId") as TextBox;

Answer 1

If I understand your question correctly, you could use method FindControl as follows:

TextBox nameTextbox = (TextBox) panel3.FindControl("textboxId") ;

Answer 2

不...你必须遍历所有控制树，直到找到控件然后你停止遍历，你的方法（MethodToFindControl）应该是一个递归方法，它接受两个参数：根容器（大部分时间是页面）和要查找的控件的ID。

Answer 3

In case you are not able to find the control using findcontrol declare corresponding td/panel as server control and then you should be able to easily find the required control within td or panel element.

DirectCast(tdMultiCnstrTypCode.FindControl("BBIMultiConsCode" & cnt + 1), DropDownList)

This approach is easier than traversing though all controls and child controls of the page.