Save file dialog

To show a save file dialog start by registering the view by decorating the XAML with the attached property DialogServiceViews.IsRegistered.

<UserControl
  x:Class="DemoApplication.Features.SaveFileDialog.Views.SaveFileTabContent"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  xmlns:md="https://github.com/fantasticfiasco/mvvm-dialogs"
  md:DialogServiceViews.IsRegistered="True">
    
</UserControl>

In the view model, open the dialog by calling IDialogService.ShowSaveFileDialog.

public class SaveFileTabContentViewModel : INotifyPropertyChanged
{
  private readonly IDialogService dialogService;
  
  public SaveFileTabContentViewModel(IDialogService dialogService)
  {
    this.dialogService = dialogService;
  }
  
  private void SaveFile()
  {
    var settings = new SaveFileDialogSettings
    {
      Title = "This Is The Title",
      InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments),
      Filter = "Text Documents (*.txt)|*.txt|All Files (*.*)|*.*",
      CheckFileExists = false
    };

    bool? success = dialogService.ShowSaveFileDialog(this, settings);
    if (success == true)
    {
      Path = settings.FileName;
    }
  }
}