Tutorial :Bind a label to a “variable”



Question:

Say I have a global variable INT named X. Since X is global, we can assume that anything can modify its value so it is being changed everytime.

Say I have a Label control named "label". Here's what I want to accomplish:

I want to "bind" the value of label.Text to variable X. In such a way that when variable X is changed, it will be reflected back to label.Text.

Now, I don't want to write event listeners and play with delegates with this one (I want the least amount of code as possible). Is there a way to use the DataBinding component for this one? or any other novel techniques?


Solution:1

If you want to use the Databinding infrastructure, and reflect the changes made to a value, you need a way to notify the UI about the changes made to the binding value.

So the best way to do that is to use a property and implement the INotifyPropertyChanged interface, like this:

class frmFoo : Form, INotifyPropertyChanged  {              private string _foo;        public string Foo      {          get { return _foo; }          set          {              _foo = value;              OnPropertyChanged("Foo");          }      }        protected virtual void OnPropertyChanged(string property)      {          if (PropertyChanged != null)              PropertyChanged(this, new PropertyChangedEventArgs(property));      }        #region INotifyPropertyChanged Members        public event PropertyChangedEventHandler PropertyChanged;        





        
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