FileFolderOpenDialogs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

using Microsoft.Win32;
using System.Windows.Forms;

namespace OpenFileOrFolder
{
    /// <summary>
    /// Логика взаимодействия для MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void selectFileBtn_Click(object sender, RoutedEventArgs e)
        {
            Microsoft.Win32.OpenFileDialog fileDialog = new Microsoft.Win32.OpenFileDialog();

            if(fileDialog.ShowDialog().Value != false)
            {
                filePath.Text = fileDialog.FileName;
            }
        }

        // same result
        private void selectWinFormsFileBtn_Click(object sender, RoutedEventArgs e)
        {
            System.Windows.Forms.OpenFileDialog fileDialog = new System.Windows.Forms.OpenFileDialog();

            if (fileDialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                winFormsFilePath.Text = fileDialog.FileName;
            }
        }

        // ugly dialog, improved in .NET 3.0
        private void selectFolderBtn_Click(object sender, RoutedEventArgs e)
        {
            FolderBrowserDialog folderDialog = new FolderBrowserDialog();


            if(folderDialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                folderPath.Text = folderDialog.SelectedPath;
            }
        }
    }
}