Remove binding in WPF using code

Question

I would like to use databinding when displaying data in a TextBox. I'm basically doing like:

 public void ShowRandomObject(IRandomObject randomObject) {
        Binding binding = new Binding {Source = randomObject, Path = new PropertyPath("Name")};
        txtName.SetBinding(TextBox.TextProperty, binding);
    }

I can't seem to find a way to unset the binding. I will be calling this method with a lot of different objects but the TextBox will remain the same. Is there a way to remove the previous binding or is this done automatically when I set the new binding?

score 94 · Answer 1 · answered Oct 09 '08 at 15:49

94

Alternately:

BindingOperations.ClearBinding(txtName, TextBox.TextProperty)

answered Oct 09 '08 at 15:49

Ed Ball

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Visual Basic won't resolve the .SetBinding(..., Nothing) call because both signatures take Reference types (a String, and a BindingBase). I like this better. – Bob King Nov 11 '08 at 17:30
4

ClearBinding method does not exist in Silverlight 3. http://stackoverflow.com/questions/1639219/clear-binding-in-silverlight-remove-data-binding-from-setbinding – Aaron Hoffman Oct 28 '09 at 18:35
@BobKing cast it (`Nothing`) to the desired type. – ANeves Nov 24 '14 at 10:52

score 50 · Accepted Answer · edited Mar 23 '18 at 08:10

50

When available

BindingOperations.ClearBinding(txtName, TextBox.TextProperty)

For older SilverLight versions, but not reliable as stated in comments:

txtName.SetBinding(TextBox.TextProperty, null);

C# 6.0 features enabled

this.btnFinish.ClearBinding(ButtonBase.CommandProperty);

edited Mar 23 '18 at 08:10

AZ_

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answered Oct 09 '08 at 09:07

Pop Catalin

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I suspected that the previous binding was removed when setting a new since I couldn't find any information on how to do it. Thanks! – Robert Höglund Oct 09 '08 at 09:13
3

This doesn't work. SetBinding is overloaded and the call becomes ambiguous when null is provided as the second parameter – Simon Fox Jul 13 '09 at 07:59
2

@Simon, when the call is ambiguous you can always cast the null value to the desired type to solve the ambiguity ;) IE: (Binding)null – Pop Catalin Jul 13 '09 at 08:24
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@Pop, your right that would work however Eds approach below is provided by the framework so obviously preferable – Simon Fox Jul 13 '09 at 20:38
4

I get an ArgumentNullException with this solution (but apparently not always) – Marcel Gosselin Sep 28 '11 at 06:06
Ed's solution is much more trustworthy. I also get an ArgumentNullException. – Alireza May 16 '12 at 06:30

score 19 · Answer 3 · edited Jun 15 '16 at 13:48

19

How about:

this.ClearValue(TextBox.TextProperty);

It's much cleaner I think ;)

edited Jun 15 '16 at 13:48

Stephan Bauer

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answered Oct 09 '08 at 11:44

Arcturus

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The documentation on this method is not very clear. It reads as if it will just clear the Value, Not the Binding. But in practice, this appears to be working. – Aaron Hoffman Oct 28 '09 at 18:45
6

BindingOperations.ClearBinding() calls this method internally. – Aaron Hoffman Oct 28 '09 at 19:06

score 0 · Answer 4 · answered Jun 04 '10 at 10:09

0

How about just

txtName.Text = txtName.Text;

You would have to set the value after clearing it anyways. This works in SL4 at least.

answered Jun 04 '10 at 10:09

Bodekaer

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Remove binding in WPF using code

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