Data binding for TextBox

Question

I have a basic property that stores an object of type Fruit:

Fruit food; public Fruit Food {     get {return this.food;}     set     {         this.food= value;         this.RefreshDataBindings();     } }  public void RefreshDataBindings() {     this.textBox.DataBindings.Clear();     this.textBox.DataBindings.Add("Text", this.Food, "Name"); } 

So I set this.Food outside the form and then it shows up in the UI.

If I modify this.Food, it updates correctly. If I modify the UI programmatically like:

this.textBox.Text = "NewFruit", it doesn't update this.Food.

Why could this be? I also implemented INotifyPropertyChanged for Fruit.Name, but still the same.

Answer 1

I Recommend you implement INotifyPropertyChanged and change your databinding code to this:

this.textBox.DataBindings.Add("Text",                                 this.Food,                                 "Name",                                 false,                                 DataSourceUpdateMode.OnPropertyChanged); 

That'll fix it.

Note that the default DataSourceUpdateMode is OnValidation, so if you don't specify OnPropertyChanged, the model object won't be updated until after your validations have occurred.