调试时调用showdialog则立即退出的问题

悬赏园豆：50 [已关闭问题]

第二次了.上次是重装系统才得以解决,这次无论如何想知道为什么会这样...

环境visual studio 2010 RC

无论是WPF还是winform程序,只要运行到showdialog()方法,则调试自动退出了..但是不调试却没有问题,百思不得其解

代码

using System;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            openFileDialog1.ShowDialog();
        }
    }
}

或者

代码

namespace WpfApplication1
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            Microsoft.Win32.OpenFileDialog open = new Microsoft.Win32.OpenFileDialog();
            open.ShowDialog();
        }
    }
}

整个程序除了默认的窗口外,就一个按钮和一个filedialog了,点击按钮则showdialog,就这么简单,但就是这样,一点击按钮就自动退出了.很头疼!

点击按钮后有些信息,但是查不到是什么原因

代码

The thread '<No Name>' (0x990) has exited with code 0 (0x0).
The program '[3884] WpfApplication1.vshost.exe: Managed (v4.0.30128)' has exited with code -2147483645 (0x80000003).
The program '[3884] WpfApplication1.vshost.exe: Program Trace' has exited with code 0 (0x0).