CODEWITHSUNDEEP
c#wpf
Litmas
Litmas

Reputation: 86

WPF Binding Label Content to Property

I have read several articles about this and can't quite seem to get my label to update when my property is changed. The PropertyChanged event is firing, and the property is updating to the new text but the label is not updating. Thanks for the help!

XAML

 <Grid.Resources>
     <c:UserInformation x:Key="myTaskData"/>
 </Grid.Resources>
 <Label Name="lblTaskNameTitle" Content="{Binding Path=propTaskName, UpdateSourceTrigger=PropertyChanged}"/>

Window

 UserInformation t = new UserInformation();                

 t.propTaskName = "Updated Task Name";
 this.DataContext = t.propTaskName;

Code Behind

class UserInformation : INotifyPropertyChanged
 {
        private string strTaskName = "Task Name: ";
        public string propTaskName
        {
            get { return this.strTaskName; }
            set 
            { 
                this.strTaskName = value;
                NotifyPropertyChanged("propTaskName");  //Call the method to set off the PropertyChanged event.
            }
        }

        //INotifyPropertyChanged stuff  
        public event PropertyChangedEventHandler PropertyChanged;
        private void NotifyPropertyChanged(string propertyName)
        {

            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));  
            }
        }

Updated to reflect comment suggestions.

Upvotes: 0

Views: 12750

Answers (2)

Owen Johnson
Owen Johnson

Reputation: 2516

Bindings look at the DataContext, not the code behind. You can make them the same thing by adding DataContext = this to your code behind, although you would want to use a separate class.

Upvotes: 1

HungDL
HungDL

Reputation: 513

Xaml should be:

<Label Name="lblTaskNameTitle" Content="{Binding Path=propTaskName, UpdateSourceTrigger=PropertyChanged}"/>

UserInformation t = new UserInformation();               
t.propTaskName = "Updated Task Name";
this.DataContext = t;

Upvotes: 3

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