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在其他人族计算机上运行我的程序时出现此异常。在MainWindow类型上调用构造函数抛出异常
The invocation of the constructor on type TCPp2pTutorialWPF.MainWindow that matches the specified binding constraints threw an exception.从PresentationFramework，方法来：Void RewrapException(System.Exception, System.Xaml.IXamlLineInfo, System.Uri)
内异常Object reference not set to an instance of an object从Finalize()
未来我无法重现此我自己的系统上，或者在虚拟机上，或者找出什么原因引起的。我很困惑，因为我还没有写最后确定（）
C＃代码：
namespace TCPp2pTutorialWPF
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
p2pchat network = null;
SelectUsername name = new SelectUsername();
public void MessageRecieved(string username, string message, bool isDisconnect)
{
ChatText.Dispatcher.Invoke((Action) (() =>
{
ChatText.AppendText(username + ": " + message+"\r");
try
{
if (isDisconnect)
{
Users.Dispatcher.Invoke((Action) (() =>
{
Users.Items.Remove(username);
}));
}
}
catch (NullReferenceException f)
{
MessageRecieved("ERROR", "We tried accessing the name list when it was null or something (??) "+f.Message + " " + f.Source, false);
}
}));
}
public void NewUser(string user)
{
ChatText.Dispatcher.Invoke(new Action(() =>
{
Users.Items.Add(user);
}));
}
public MainWindow()
{
try
{
InitializeComponent();
}
catch (Exception e)
{
MessageBox.Show("Error initializing main chat window " + e.Message + " " + e.Source + " " + e.HelpLink.ToString() + " " + e.TargetSite);
}
if (string.IsNullOrEmpty(name.UserName))
try
{
name.ShowDialog();
}
catch (Exception e)
{
MessageRecieved("ERROR", e.Message, false);
}
network = new p2pchat();
ChatText.AppendText("port " + network.Port + " may need to be forwarded to accept incoming connections\r");
//add the handlers
network.ReceivedMessageHandler += MessageRecieved;
network.NewUserHandler += NewUser;
network.MyUserName = name.UserName;
network.Start();
}
private void ListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
}
private void Button_Click(object sender, RoutedEventArgs e)
{
Window1 getip = new Window1();
try
{
getip.ShowDialog();
}
catch (Exception ee)
{
MessageRecieved("ERROR", ee.Message, false);
}
string Ip = getip.Ip;
if (!string.IsNullOrEmpty(Ip))
network.MakeConnection(Ip);
}
private void SendBox_KeyDown(object sender, KeyEventArgs e)
{
if (e.Key.Equals(Key.Enter))
{
network.SendMessage(new TextRange(SendBox.Document.ContentStart, SendBox.Document.ContentEnd).Text);
SendBox.Document.Blocks.Clear();
}
}
}
}
XAML：
<Window x:Class="TCPp2pTutorialWPF.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Chat" Height="379.439" Width="716.9" WindowStartupLocation="CenterScreen">
<Grid x:Name="Chat_Window">
<RichTextBox x:Name="ChatText" HorizontalAlignment="Left" Height="280" Margin="0,23,0,0" VerticalAlignment="Top" Width="553" SpellCheck.IsEnabled="True" IsReadOnly="True" IsUndoEnabled="False" VerticalScrollBarVisibility="Auto" AcceptsReturn="False">
<RichTextBox.Effect>
<DropShadowEffect/>
</RichTextBox.Effect>
<FlowDocument AllowDrop="False"/>
</RichTextBox>
<ListBox x:Name="Users" HorizontalAlignment="Left" Height="280" Margin="558,23,0,0" VerticalAlignment="Top" Width="141" SelectionChanged="ListBox_SelectionChanged"/>
<Menu x:Name="Menu" HorizontalAlignment="Left" Height="23" VerticalAlignment="Top" Width="699">
<Button Content="User name"/>
<Button x:Name="addip" Content="Add IP" Click="Button_Click"/>
</Menu>
<RichTextBox x:Name="SendBox" HorizontalAlignment="Left" Height="30" Margin="0,318,0,0" VerticalAlignment="Top" Width="699" SpellCheck.IsEnabled="True" KeyDown="SendBox_KeyDown" AcceptsReturn="False">
<FlowDocument>
<Paragraph>
<Run Text=""/>
</Paragraph>
</FlowDocument>
</RichTextBox>
</Grid>
编辑：将在堆栈跟踪的屏幕截图，不打算输入那个。现在将它记录到一个文件。
并添加upnp_helper代码，因为它似乎引用它。
namespace TCPp2pTutorialWPF
{
class UPNP_Helper
{
UPnPNAT NatMgr;
List<int> ports = new List<int>();
public UPNP_Helper()
{
NatMgr = new UPnPNAT();
}
~UPNP_Helper()
{
foreach (int i in ports)
{
try
{
NatMgr.StaticPortMappingCollection.Remove(i, "TCP");
}
catch
{
}
}
}
public bool AddMappingToThisLocalIp(int port)
{
try
{
NatMgr.StaticPortMappingCollection.Add(port, "TCP", port, LocalIPAddress().ToString(), true, "p2pChat");
ports.Add(port);
return true;
}
catch
{
return false;
}
}
private IPAddress LocalIPAddress()
{
if (!System.Net.NetworkInformation.NetworkInterface.GetIsNetworkAvailable())
{
return null;
}
IPHostEntry host = Dns.GetHostEntry(Dns.GetHostName());
return host
.AddressList
.FirstOrDefault(ip => ip.AddressFamily == AddressFamily.InterNetwork);
}
}
}
请发布内部异常的堆栈跟踪。 – Dennis
这是什么'SelectUsername name = new SelectUsername（）;'干嘛？也许这条线是有问题的，请注释掉，看看它是否有效 – Jehof
这是创建一个新窗口来选择一个用户名。我会研究它。编辑：不，那个窗口必须被创建为引用类型。 – fotg