从代码隐藏中删除asp.net控件

Question

I need to remove a control (a textbox) from my page when a certain condition is verified. Is it possible to do from code-behind or I need to use JavaScript.

NOTE I need to remove the control, not to hide...

Answer 1

Use Controls.Remove or Controls.RemoveAt on the parent ControlCollection .

For example, if you want to remove all TextBoxes from the page's top:

var allTextBoxes = Page.Controls.OfType<TextBox>().ToList();
foreach(TextBox txt in allTextBoxes)
    Page.Controls.Remove(txt);

_{(note that you need to add using System.Linq for Enumerable.OfType )}

or if you want to remove a TextBox with a given ID:

TextBox textBox1 = (TextBox)Page.FindControl("TextBox1"); // note that this doesn't work when you use MasterPages
if(textBox1 != null)
    Page.Controls.Remove(textBox1);

If you just want to hide it (and remove it from clientside completely), you can also make it invisible:

textBox1.Visible = false;

Answer 2

While you could remove it from the controls collection, why not hide it instead?

yourTextBox.Visible = false;

This will prevent it from being included in the generated html sent to the browser.

Answer 3

When you set .Visible=false , it will never be rendered in the page. If you remove the control from Controls collection, don't do it during DataBind , Init , Load , PreRender or Unload phases as it will throw exception.

Adding or removing control dynamically may result in problems.

Answer 4

是的，您可以从页面的controles集合中删除它：

this.Controls.Remove(control);

Answer 5

You can try with this code - based on Remove method

this.Controls.Remove(YourControl);

Link : http://msdn.microsoft.com/en-US/library/system.web.ui.controlcollection.remove(v=vs.80).aspx