How to hookup TextBox's TextChanged event and Command in order to use MVVM pattern in Silverlight

Question

Recently, I realized that MVVM pattern is so useful for Silverlight application and studying how to adopt it into my project.

BTW, how to hook up the textbox\'s text

Answer 1

In the definition section we add:

xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"

If you use the TextBox, add the reference to the event we want to detect:

In the ViewModel add code for Commad:

public ICommand FilterTextChangedCommand
{
  get
  {
    if (this._filterTextChangedCommand == null)
    {
      this._filterTextChangedCommand =
        new RelayCommand(param => this.OnRequestFilterTextChanged());
    }
    return this._filterTextChangedCommand;
  }
}

private void OnRequestFilterTextChanged()
{
  // Add code
}

Do not forget to perform the binding text:

private string _textPrintersFilter;
public string TextPrintersFilter
{
  get { return _textPrintersFilter; }
  set
  {
    _textPrintersFilter = value;
    this.RaisePropertyChange(nameof(TextPrintersFilter));
  }
}