iamgsiWpf

<Window x:Class="WpfApplication2.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:WpfApplication2"
    Title="Window1" Height="300" Width="396">
    <StackPanel>
        <local:UserControl1 x:Name="testUC" FileName="c:\lindsay.htm"/>
        <TextBlock Text="{Binding FileName, ElementName=testUC}"/>
    </StackPanel>
</Window>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
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;

namespace WpfApplication2
{
    /// <summary>
    /// Window1.xaml에 대한 상호 작용 논리
    /// </summary>
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }
    }
}

<UserControl x:Class="WpfApplication2.UserControl1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Height="39" Width="300" x:Name="root">
    <DockPanel>
        <Button x:Name="theButton" DockPanel.Dock="Right" Click="theButton_Click">
            Browse...
        </Button>
        <TextBox x:Name="theTextBox"
                 MinWidth="{Binding ActualWidth, ElementName=theButton}" Margin="0,0,2,0"
                 Text="{Binding FileName, ElementName=root}"/>
    </DockPanel>
</UserControl>

using System;
using System.Windows;
using System.Windows.Controls;
using Microsoft.Win32;

namespace WpfApplication2
{
    /// <summary>
    /// UserControl1.xaml에 대한 상호 작용 논리
    /// </summary>
    public partial class UserControl1 : UserControl
    {
        public UserControl1()
        {
            InitializeComponent();
            theTextBox.TextChanged += new TextChangedEventHandler(theTextBox_TextChanged);
        }

        void theTextBox_TextChanged(object sender, TextChangedEventArgs e)
        {
            e.Handled = true;
            if (FileNameChanged != null)
                FileNameChanged(this, EventArgs.Empty);
        }

        private void theButton_Click(object sender, RoutedEventArgs e)
        {
            OpenFileDialog d = new OpenFileDialog();
            if (d.ShowDialog() == true)
                this.FileName = d.FileName;
        }

        public string FileName
        {
            get
            {
                return (string)GetValue(FileNameProperty);
            }

            set
            {
                SetValue(FileNameProperty, value);
            }
        }

        public static DependencyProperty FileNameProperty =
            DependencyProperty.Register("FileName", typeof(string), typeof(UserControl1));
        public event EventHandler<EventArgs> FileNameChanged;
    }
}