Solved

Data binding control to object property

Posted on 2004-08-20
5
286 Views
Last Modified: 2011-09-20
I have a custom object with several properties.  When I bind the controls (e.g. textbox's text property) to a property of the object, it works fine.  However, when I update the object in code (change the properties programmatically), the changes are not reflected in the bound controls.  Is there a way to cause the changes to the property to be propagated to the controls?
0
Comment
Question by:Jetgunner
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
5 Comments
 
LVL 10

Expert Comment

by:eternal_21
ID: 11854081
In you custom object you need this code:

  public event System.ComponentModel.PropertyChangedEventHandler PropertyChanged;

and when you change a property (e.g. MyProperty), you raise a PropertyChanged event:

    private object myProperty;
    public object MyProperty
    {
      get { return myProperty; }
      set
      {
        if(myProperty!=value)
        {
          myProperty = value;

          if(PropertyChanged!=null)
            PropertyChanged(this, new System.ComponentModel.PropertyChangedEventArgs("MyProperty"));
        }
      }
    }
0
 
LVL 10

Expert Comment

by:eternal_21
ID: 11854104
Oops!  I didn't realize that I was in VB... give the points to anyone that can convert that :)
0
 

Author Comment

by:Jetgunner
ID: 11854480
I added that code to my application (in vb of course).  When I trace through the app, I can see that the PropertyChanged  event does get raised when I change a property, but that doesn't seem to change the bound fields.
0
 
LVL 10

Accepted Solution

by:
eternal_21 earned 125 total points
ID: 11855300
Can you give this a try?  Change your code:

  public event System.EventHandler MyPropertyChanged;

And then call:

  if(MyPropertyChanged!=null)
     MyPropertyChanged(this, new System.EventArgs());
0
 
LVL 10

Expert Comment

by:eternal_21
ID: 11855305
If you property is called "CustomProperty1", you must call the event "CustomProperty1Changed"
0

Featured Post

SharePoint Admin?

Enable Your Employees To Focus On The Core With Intuitive Onscreen Guidance That is With You At The Moment of Need.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Article by: jpaulino
XML Literals are a great way to handle XML files and the community doesn’t use it as much as it should.  An XML Literal is like a String (http://msdn.microsoft.com/en-us/library/system.string.aspx) Literal, only instead of starting and ending with w…
Introduction As chip makers focus on adding processor cores over increasing clock speed, developers need to utilize the features of modern CPUs.  One of the ways we can do this is by implementing parallel algorithms in our software.   One recent…
Monitoring a network: why having a policy is the best policy? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the enormous benefits of having a policy-based approach when monitoring medium and large networks. Software utilized in this v…
Add bar graphs to Access queries using Unicode block characters. Graphs appear on every record in the color you want. Give life to numbers. Hopes this gives you ideas on visualizing your data in new ways ~ Create a calculated field in a query: …

729 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question