System.InvalidOperationException：“跨线程操作无效：从创建它的线程以外的线程访问控制“Form1”。”

Question

在网络连接或断开连接后更改 Windows 状态会引发错误

System.InvalidOperationException: 'Cross-thread operation not valid: Control 'Form1' accessed from a thread other than the thread it was created on.'

附上源代码。 请只做那些需要的。

using iTuner;
using System;
using System.Windows.Forms;

namespace NetworkConnectError
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            DisposeBrowser();
            WindowState = FormWindowState.Minimized;
            this.Visible = false;

        }

        private void DisposeBrowser()
        {
            try
            {
                if (webBrowser1 == null || webBrowser1.IsDisposed) return;

                webBrowser1.Navigate(new Uri("about:blank"));//TRK - 107
                webBrowser1.Stop();

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private void NetworkAvailabilityChanged(object sender, NetworkStatusChangedArgs e)
        {
            try
            {
                if (e.IsAvailable)
                {

                    System.Threading.Thread myThread = new System.Threading.Thread(new System.Threading.ThreadStart(Client));
                    myThread.Start();
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }


        private void Client()
        {
            WindowState = FormWindowState.Maximized;
            webBrowser1.Left = 0;
            webBrowser1.Top = 0;

            Screen scr = Screen.PrimaryScreen;
            webBrowser1.Width = scr.Bounds.Width;
            int iHeight = scr.Bounds.Height;
            iHeight = iHeight + 50;
            webBrowser1.Height = iHeight;
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            NetworkStatus.AvailabilityChanged += new NetworkStatusChangedHandler(NetworkAvailabilityChanged);
        }
    }
}

Note：此问题总结整理于:System.InvalidOperationException: 'Cross-thread operation not valid: Control 'Form1' accessed from a thread other than the thread it was created on.'

Answer 1

如Castorix31 说，您需要从线程安全地调用 Windows 窗体控件。
我使用 BackgroundWorker 而不是您的线程。
以下是我修改后的代码：

private void NetworkAvailabilityChanged(object sender, NetworkStatusChangedArgs e)  
{  
    try  
    {  
        if (e.IsAvailable)   
        {  
            BackgroundWorker backgroundWorker = new BackgroundWorker();  
            backgroundWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(BackgroundWorker_RunWorkerCompleted);  
            backgroundWorker.RunWorkerAsync();  
        }  
    }  
    catch (Exception ex)  
    {  
        MessageBox.Show(ex.Message);  
    }  
}  
  
private void Form1_Load(object sender, EventArgs e)  
{  
    NetworkStatus.AvailabilityChanged += new NetworkStatusChangedHandler(NetworkAvailabilityChanged);  
}  
  
private void BackgroundWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)  
{  
    webBrowser1.Left = 0;  
    webBrowser1.Top = 0;  
    Screen scr = Screen.PrimaryScreen;  
    webBrowser1.Width = scr.Bounds.Width;  
    int iHeight = scr.Bounds.Height;  
    iHeight = iHeight + 50;  
    webBrowser1.Height = iHeight;  
}

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