public void listrnerserver()
        {
            Byte[] Gbuff = new Byte[1024];
            
            ctrl m = new ctrl();

            MemoryStream mstream = new MemoryStream();
            mstream.Position = 0;
            while (true)
            {
                int i = nstream.Read(Gbuff, 0, Gbuff.Length);
                if (i==0)
                {
                    break;
                }
                else
                {
                    MessageBox.Show("成功获取到数据");
                    mstream.Write(Gbuff, 0, i);
                    //这个地方开始就没有继续往下运行了
                    

                }
            }
            
            mstream.Flush();
            
            mstream.Position = 0;
            BinaryFormatter bformatter = new BinaryFormatter();
            
            if (mstream.Capacity > 0)
            {
                m = (ctrl)bformatter.Deserialize(mstream);
               
            }
            else
            {
                MessageBox.Show("接收的数据为空");
            }
            MessageBox.Show(m.m_ctrl.ToString());
         
               }

                    MessageBox.Show("成功获取到数据");
                    mstream.Write(Gbuff, 0, i);
                    //这个地方开始就没有继续往下运行了
证明i==0跳出循环了

问题就是连              mstream.Flush();
            
            mstream.Position = 0;
            BinaryFormatter bformatter = new BinaryFormatter();
            
            if (mstream.Capacity > 0)
            {
                m = (ctrl)bformatter.Deserialize(mstream);
               
            }
            else
            {
                MessageBox.Show("接收的数据为空");
            }
            MessageBox.Show(m.m_ctrl.ToString());
         
               }

这里的都没运行

while (true)
            {
                int i = nstream.Read(Gbuff, 0, Gbuff.Length);
                if (i==0)
                {
                    break;
                }
                else
                {
                    MessageBox.Show("成功获取到数据");
                    mstream.Write(Gbuff, 0, i);
                    //这个地方开始就没有继续往下运行了
                    

                }
            }
你这里好像是个死循环
首先int i = nstream.Read(Gbuff, 0, Gbuff.Length);从内存中读取数据到Gbuff,返回读取长度
假设有读取到数据,即i!=0,进入else
mstream.Write(Gbuff, 0, i);这里又把Gbuff中的数据写回内存
然后下一次循环
继续把写进去内存的内容,又读到Gbuff,然后又写回内存....
继续继续....直到程序抛出异常,然后终止运行