WPF - C# Desktop App - Is there a way to call a Windows form from C# WPF?

Question

Hello,
Is there a way to call a Windows form from C#WPF?

The idea is to create a separate message box. Or a WPF message box.

With best regards Markus

Answer 1

Hi Markus,
create your own Messagebox like this:

And CodeBehind:

using System.Windows;  
using System.Windows.Input;  
using WpfApp01;  
  
namespace WpfApp66  
{  
  public partial class MyMessageBox : Window  
  {  
    public MyMessageBox()  
    {  
      InitializeComponent();  
      this.DataContext = this;  
    }  
    public static object ShowDialog(string msg) => (new MyMessageBox() { Message = msg }).ShowDialog();  
    public string Message { get; set; }  
    public ICommand Cmd { get => new RelayCommand((state) => { ExitMessageBox((state != null && state.ToString() == "True")); }); }  
    private void ExitMessageBox(bool result)  
    {  
      this.DialogResult = result;  
      this.Close();  
    }  
  }  
}  

And using:

MyMessageBox.ShowDialog("Display my Message");  

Answer 2

You will give you a very simple demo for showing the custom MessageBox.
MyMessageBox.cs

    public static int OK = 0;  
    public static int OKCANCLE = 1;  
    public MyMessageBox() { }  

    public static bool? ShowDialog(string mess, int style)  
    {  
        switch (style)  
        {  
            case 0:  
                MessageBoxOK myMessageBoxOK = new MessageBoxOK(mess);  
                return myMessageBoxOK.ShowDialog();  
            case 1:  
                MessageBoxOKCancle myMessageBoxOKCancle = new MessageBoxOKCancle(mess);  
                return myMessageBoxOKCancle.ShowDialog();  
            default:  
                return false;  
        }  
    }  
  
MessageBoxOK.cs  

 public MessageBoxOK()  
        {  
            InitializeComponent();  
        }  
        public MessageBoxOK(string mess)  
        {  
            InitializeComponent();  
            message.Text = mess;  
        }  
        private void Button_Click(object sender, RoutedEventArgs e)  
        {  
            try  
            {  
                this.DialogResult = false;  
            }  
            catch (Exception ex) { }  
  
            this.Close();  
        }  

MessageBoxOK.xaml

Then you can use

MyMessageBox.ShowDialog("This is content", MyMessageBox.OK);

to show the MessageBoxOK

Answer 3

Hi Markus,
you can create Window with content and call ShowDialog:

  public class ViewModel
  {
    public ICommand Cmd
    {
      get => new RelayCommand((state) =>
      {
        var wnd = new Window() { Width = 200, Height = 100 };
        var grid = new Grid();
        wnd.Content = grid;
        grid.Children.Add(new TextBlock() { Text = "Message", 
          HorizontalAlignment = HorizontalAlignment.Center });
        wnd.ShowDialog();
      });
    }
  }

Answer 4

See my comment

Answer 5

OK, I can do it normal.

<Window x:Class="Test.MessageBoxInfo"  
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"  
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"  
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"  
        xmlns:local="clr-namespace:PreSettingStation"  
        mc:Ignorable="d"  
        Title="MessageBoxInfo Error" Height="450" Width="800">  
    <Grid>  
        <TextBox HorizontalAlignment="Left" Height="74" Margin="180,199,0,0" TextWrapping="Wrap" Text="Fehler" VerticalAlignment="Top" Width="157" TextChanged="TextBox_TextChanged"/>  
  
    </Grid>  
</Window>  

How can I check the OK button when closing the window?
Or YES, NO, Cancel