线程间操作无效: 从不是创建控件的线程访问它。

Question

namespace Threadtest
{
    public partial class ShowForm : Form
    {
        public ShowForm()
        {
            InitializeComponent();
           
        }        private void ShowForm_Load(object sender, EventArgs e)
        {
            this.Controls.Add(tc);
        }
        public void ShowWeb(List<string> strUrls)
        {
            for (int i = 0; i < strUrls.Count; i++)
            {
                string objUrl = strUrls[i];
                ParameterizedThreadStart ps = new ParameterizedThreadStart(ThreadWeb);
                Thread th = new Thread(ps);
                th.SetApartmentState(ApartmentState.STA);
                th.Start((object)objUrl);
            }
        }
        TabControl tc = new TabControl();
        private void ThreadWeb(object objUrl)
        {
            string strUrl = (string)objUrl;
            WebBrowser web = new WebBrowser();
            web.Url = new Uri(strUrl);
            web.Dock = DockStyle.Fill;
            TabPage tp = new TabPage();
            tp.Controls.Add(web);
         
            tc.Controls.Add(tp);
        }
    }
}
tc不是在线程中创建的。有没有人知道怎么办？

Answer 1

线程切换的问题.
查看InvokeRequired 

Answer 2

谢谢楼上的。Invoke不会用。查了半天也没找到答案。能不能给个具体的答案。

Answer 3

delegate void SetText(Control C,String Text); void DoSetText(Control C,String Text) 
{ 
    C.Text=Text; 
} SetTextWithDelegate(Control C,String Text) 
{ 
    SetText PSetText=new SetText(DoSetText); 
    if (C.InvokeRequired) 
        C.Invoke(PSetText,new Object[]{C,Text}); 
    else 
        C.Text=Text; 
} SetTextWithDelegate(textBox1,"TEXT"); 

Answer 4

谢谢楼上的。能不能把我的程序加上Invoke，我真的不会用。

Answer 5

倒。
namespace Threadtest 
{ 
    public partial class ShowForm : Form 
    { 
        public ShowForm() 
        { 
            InitializeComponent(); 
          
        }         private void ShowForm_Load(object sender, EventArgs e) 
        { 
            this.Controls.Add(tc); 
        } 
        public void ShowWeb(List <string> strUrls) 
        { 
            for (int i = 0; i < strUrls.Count; i++) 
            { 
                string objUrl = strUrls[i]; 
                ParameterizedThreadStart ps = new ParameterizedThreadStart(ThreadWeb); 
                Thread th = new Thread(ps); 
                th.SetApartmentState(ApartmentState.STA); 
                th.Start((object)objUrl); 
            } 
        } 
        TabControl tc = new TabControl();         delegate void AddTabPage(TabControl TC,TabPage Page);         void DoAddTabPage(TabControl TC,TabPage Page) 
        { 
            TC.Add(Page);
        }         AddTabPageWithDelegate(TabControl TC,TabPage Page) 
        { 
            AddTabPage PAddTabPage=new AddTabPage(DoAddTabPage); 
            if (TC.InvokeRequired) 
                TC.Invoke(PAddTabPage, new Object[]{ TC, Page }); 
            else 
                TC.Add(Page);
        } 
        
        void ThreadWeb(object objUrl) 
        { 
            string strUrl = (string)objUrl; 
            WebBrowser web = new WebBrowser(); 
            web.Url = new Uri(strUrl); 
            web.Dock = DockStyle.Fill; 
            TabPage tp = new TabPage(); 
            tp.Controls.Add(web);             AddTabPageWithDelegate(tc,tp)       
        } 
    } 
} 

Answer 6

不行啊！namespace Threadtest 
{ 
    public partial class ShowForm : Form 
    { 
        public ShowForm() 
        { 
            InitializeComponent(); 
          
        }         private void ShowForm_Load(object sender, EventArgs e) 
        { 
            this.Controls.Add(tc); 
        } 
        public void ShowWeb(List <string> strUrls) 
        { 
            for (int i = 0; i < strUrls.Count; i++) 
            { 
                string objUrl = strUrls[i]; 
                ParameterizedThreadStart ps = new ParameterizedThreadStart(ThreadWeb); 
                Thread th = new Thread(ps); 
                th.SetApartmentState(ApartmentState.STA); 
                th.Start((object)objUrl); 
            } 
        } 
        TabControl tc = new TabControl();         delegate void AddTabPage(TabControl TC,TabPage Page);         void DoAddTabPage(TabControl TC,TabPage Page) 
        { 
            TC.Add(Page);
        }         AddTabPageWithDelegate(TabControl TC,TabPage Page) 
        { 
            AddTabPage PAddTabPage=new AddTabPage(DoAddTabPage); 
            if (TC.InvokeRequired)                 //线程间操作无效: 从不是创建控件“”的线程访问它。
                TC.Invoke(PAddTabPage, new Object[]{ TC, Page }); 
            else 
                TC.Add(Page);
        } 
        
        void ThreadWeb(object objUrl) 
        { 
            string strUrl = (string)objUrl; 
            WebBrowser web = new WebBrowser(); 
            web.Url = new Uri(strUrl); 
            web.Dock = DockStyle.Fill; 
            TabPage tp = new TabPage(); 
            tp.Controls.Add(web);             AddTabPageWithDelegate(tc,tp)       
        } 
    } 
} 

Answer 7

namespace Threadtest 
{ 
    public partial class ShowForm : Form 
    { 
        public ShowForm() 
        { 
            InitializeComponent(); 
          
        }         private void ShowForm_Load(object sender, EventArgs e) 
        { 
            this.Controls.Add(tc); 
        } 
        public void ShowWeb(List <string> strUrls) 
        { 
            for (int i = 0; i < strUrls.Count; i++) 
            { 
                string objUrl = strUrls[i]; 
                ParameterizedThreadStart ps = new ParameterizedThreadStart(ThreadWeb); 
                Thread th = new Thread(ps); 
                th.SetApartmentState(ApartmentState.STA); 
                th.Start((object)objUrl); 
            } 
        } 
        TabControl tc = new TabControl();         delegate void AddTabPage(TabControl TC,TabPage Page);         void DoAddTabPage(TabControl TC,TabPage Page) 
        { 
            TC.Controls.Add(Page);
        }         void AddTabPageWithDelegate(TabControl TC,TabPage Page) 
        { 
            AddTabPage PAddTabPage=new AddTabPage(DoAddTabPage); 
            if (TC.InvokeRequired)
                //线程间操作无效: 从不是创建控件“”的线程访问它。 
                TC.Invoke(PAddTabPage, new Object[]{ TC, Page }); 
            else 
                TC.Controls.Add(Page);
        } 
        
        void ThreadWeb(object objUrl) 
        { 
            string strUrl = (string)objUrl; 
            WebBrowser web = new WebBrowser(); 
            web.Url = new Uri(strUrl); 
            web.Dock = DockStyle.Fill; 
            TabPage tp = new TabPage(); 
            tp.Controls.Add(web);            AddTabPageWithDelegate(tc, tp);    
        } 
    } 
} 

Answer 8

        AddTabPageWithDelegate(TabControl TC,TabPage Page) 
        { 
            AddTabPage PAddTabPage=new AddTabPage(DoAddTabPage); 
            if (Page.GetCurrentParent().InvokeRequired) 
                Page.GetCurrentParent().Invoke(PAddTabPage, new Object[]{ TC, Page }); 
            else 
                TC.Add(Page);
        } 

Answer 9

 AddTabPageWithDelegate(TabControl TC,TabPage Page) 
        { 
            AddTabPage PAddTabPage=new AddTabPage(DoAddTabPage); 
            if (Page.InvokeRequired) 
                Page.Invoke(PAddTabPage, new Object[]{ TC, Page }); 
            else 
                TC.Add(Page);
        } 
不好意思，没有GetCurrentParent 手头还在并行忙写别的代码，写得忙了点

Answer 10

不知道加上这句话行不行
System.Windows.Forms.Control.CheckForIllegalCrossThreadCalls = false;

Answer 11

是应该用线程里创建的tp去invoke主线程的tc而不是返过来

Answer 12

这是我上次用这话的后果，偶尔地程序崩溃，后来读写界面控件的代码改用委托后就很稳定了未处理 System.AccessViolationException
  Message="尝试读取或写入受保护的内存。这通常指示其他内存已损坏。"
  Source="System.Windows.Forms"
  StackTrace:
       在 System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
       在 System.Windows.Forms.NativeWindow.DefWndProc(Message& m)
       在 System.Windows.Forms.Control.DefWndProc(Message& m)
       在 System.Windows.Forms.Control.WndProc(Message& m)
       在 System.Windows.Forms.TextBoxBase.WndProc(Message& m)
       在 System.Windows.Forms.RichTextBox.WndProc(Message& m)
       在 System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
       在 System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       在 System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
       在 System.Windows.Forms.UnsafeNativeMethods.PeekMessage(MSG& msg, HandleRef hwnd, Int32 msgMin, Int32 msgMax, Int32 remove)
       在 System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
       在 System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
       在 System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
       在 System.Windows.Forms.Form.ShowDialog(IWin32Window owner)
       在 System.Windows.Forms.Form.ShowDialog()
       在 DSMT.ProcessData.ForegroundMonitor.frmRemotingLogin.BtnRomatingLogin_Click(Object sender, EventArgs e) 位置 D:\WANGTING\DMST.ProcessData\DSMT.ProcessData.ForegroundMonitor\frmRemotingLogin.cs:行号 65
       在 System.Windows.Forms.Control.OnClick(EventArgs e)
       在 System.Windows.Forms.Button.OnClick(EventArgs e)
       在 System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
       在 System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
       在 System.Windows.Forms.Control.WndProc(Message& m)
       在 System.Windows.Forms.ButtonBase.WndProc(Message& m)
       在 System.Windows.Forms.Button.WndProc(Message& m)
       在 System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
       在 System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       在 System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
       在 System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
       在 System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
       在 System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
       在 System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
       在 System.Windows.Forms.Application.Run(Form mainForm)
       在 DSMT.ProcessData.ForegroundMonitor.Program.Main() 位置 D:\WANGTING\DMST.ProcessData\DSMT.ProcessData.ForegroundMonitor\Program.cs:行号 17
       在 System.AppDomain.nExecuteAssembly(Assembly assembly, String[] args)
       在 System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       在 Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       在 System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       在 System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       在 System.Threading.ThreadHelper.ThreadStart()

Answer 13

    public delegate void TestDelgate( string strUrl );
    public partial class ShowForm : Form
    {
        public ShowForm()
        {
            InitializeComponent();
        }        private void ShowForm_Load( object sender, EventArgs e )
        {
            this.Controls.Add( tc );
            List<string> strUrls = new List<string>();
            strUrls.Add( "http://topic.csdn.net/u/20080924/13/80570378-04d4-4993-99b4-dc8234f4a50d.html" );
            strUrls.Add( "http://cn.msn.com/" );
            ShowWeb( strUrls );
        }
        public void ShowWeb( List<string> strUrls )
        {
            for( int i = 0; i < strUrls.Count; i++ )
            {
                string objUrl = strUrls[ i ];
                ParameterizedThreadStart ps = new ParameterizedThreadStart( ThreadWeb );
                Thread th = new Thread( ps );
                th.SetApartmentState( ApartmentState.STA );
                th.Start( ( object )objUrl );
            }
        }
        TabControl tc = new TabControl();
        private void ThreadWeb( object objUrl )
        {
            string strUrl = ( string )objUrl;
            TestDelgate test = new TestDelgate(this.TestMethod);
            this.Invoke( test, new object[] { strUrl } );
        }
        private void TestMethod( string strUrl )
        {
            WebBrowser web = new WebBrowser();
            web.Url = new Uri( strUrl );
            web.Dock = DockStyle.Fill;
            TabPage tp = new TabPage();
            tp.Controls.Add( web );
            tc.Controls.Add( tp );
        }别在线程里生成控件了。放在委托里生成。效果一样。

Answer 14

我也是用这个System.Windows.Forms.Control.CheckForIllegalCrossThreadCalls = false;
有时出错。
这个不是解决之道，尽量少用。

Answer 15

谢谢了，说的没错，把变量都放在委托里。
也谢谢wartim 。
结贴给分了。

Answer 16

CheckForIllegalCrossThreadCalls = false;

Answer 17

加上这句话应该是可以的，我刚才的一个Demo也是这个问题，我加入这句话后运行正常了！