访问在另一个线程中实例化的对象的成员。

问题描述

我在主（GUI）线程中声明了一个对象，并从另一个线程实例化。我需要从中访问一个成员。但是访问该对象的方法会导致：



System.NullReferenceException：'对象引用未设置为对象的实例。'



srv为空。

以下是产生上述错误的代码：

I have an object declared in the main (GUI) thread and instantiated from another thread. I require to access a member from it. However accessing a method of the object results in:

System.NullReferenceException: 'Object reference not set to an instance of an object.'

srv was null.
The following is the code resulting in the above error:

public partial class MainWindow : Window
{

     Thread t = null;
     ServerSpace.Server srv = null;
     bool serveractive = false;
    .
    .
    .
      private void start_MouseDown(object sender, MouseButtonEventArgs e)
      {
           if(!serveractive)
           {
                App.connectioninfo = new ServerSpace.ServerInfo(IPAdd.Text,
                Int32.Parse(PRTNo.Text));

                 t = new Thread(() =>
                 {
                      srv = new ServerSpace.Server(App.connectioninfo)
                 });
                 t.Start();
           }
           else
           {
                    srv.stopserver();
                    MessageBox.Show("Server stopped.");
           }


       }
}

serveractive将一旦Server（ServerInfo）构造函数被执行，就设置为true。在srv.stopserver（）抛出异常。



我应该在上面的代码中进行哪些更正？



我尝试了什么：



我尝试使用Application.Current.Dispatcher.Invoke，但是同样的错误结果。

"serveractive" will be set true once "Server(ServerInfo)" constructor gets executed. The exception is thrown at "srv.stopserver()".

What correction should I proceed with in the above code ?

What I have tried:

I tried using "Application.Current.Dispatcher.Invoke", but the same error results.

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