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「Cross-thread operation not valid」 exception on inner controlsC#如何調用由工作線程的主線程創建的對象的方法?
我是C#初學者,最近我跑過來一橫紗前。現在我搜索了高低,找到了我的問題的答案,但是,沒有一個像我一樣,所以希望有人可以提供幫助。這是解釋我的問題。
1)我伸出Microsoft.VisualBasic.PowerPacks.OvalShape一些更多的功能添加到它,所以它符合我的需要和這裏是我延伸到類:
public class MyShape: Microsoft.VisualBasic.PowerPacks.OvalShape
{
int imageNumber;
public MyShape()
{
imageNumber = 0;
this.BackgroundImage = global::_4InARow.Properties.Resources.grey;
}
public int getImageNumber()
{
return imageNumber;
}
public bool setImage(int imgNo)
{
imageNumber = imgNo;
if (imgNo == 0) { this.BackgroundImage = global::_4InARow.Properties.Resources.grey; return true; }
else if (imgNo == 1) { this.BackgroundImage = global::_4InARow.Properties.Resources.blue; return true; }
else if (imgNo == 2) { this.BackgroundImage = global::_4InARow.Properties.Resources.red; return true; }
else { return false; }
}
}
2)在設計器類我創建了幾個對象的FOM的class MyShape
後來他們叫我(FourInARow_Server)
添加使用arrayLoad()
方法交錯數組創建的所有對象的主要類添加到ShapeContainer,使用main thread
或UI thread.(highlight ShapeContainer)
3)。 (類在下面列出)
當我使用工作線程(不是創建對象的線程)異步訪問方法changeColor(int x, int y, int color)
時,會發生異常。 但是,如果比如我說
if(circles[1][1].getImageNumber() == 0)
{//do something};
(在使用輔助線程和主線程工作確定)我可以訪問的對象
有關異常的另一件事是,當抱怨叫做工作者線程一個在主線程中創建的對象,它是引發異常的ShapeContainer對象而不是MyShape對象。
我現在正在尋找一種解決方案來安全地訪問changeColor方法,以使用兩個線程來更改每個對象的顏色。
就像我說過的,我確實在網上看到了答案,但沒有一個像我所面對的,我希望有人能幫上忙。謝謝!
public partial class FourInARow_Server : Form
{
private MyShape[][] circles = new MyShape[7][];
private Socket newConnection;
private Thread newThread;
private int player;
private bool flag_MyTurn;
private bool flag_ConnectionAlive;
private bool flag_MoveAllowed;
private bool flag_EventBlocker;
public FourInARow_Server()
{
InitializeComponent();
arrayLoad();
player = 1;
flag_MyTurn = true;
flag_ConnectionAlive = false;
flag_MoveAllowed = false;//variable needed to prevent user from loosing its turn if it clicks on a colomn that hasn,t got any more available moves.
flag_EventBlocker = true;
this.labelSystemMessage.Text = "To begin play, please press \"Launch Server\" \n and wait for opponent to connect ";
}
private void arrayLoad()//Load all ovall shapes into an array
{
MyShape[] colOne = { x1y1, x1y2, x1y3, x1y4, x1y5, x1y6};
MyShape[] colTwo = { x2y1, x2y2, x2y3, x2y4, x2y5, x2y6};
MyShape[] colThree = { x3y1, x3y2, x3y3, x3y4, x3y5, x3y6};
MyShape[] colFour = { x4y1, x4y2, x4y3, x4y4, x4y5, x4y6 };
MyShape[] colFive = { x5y1, x5y2, x5y3, x5y4, x5y5, x5y6 };
MyShape[] colSix = { x6y1, x6y2, x6y3, x6y4, x6y5, x6y6};
MyShape[] colSeven = {x7y1, x7y2, x7y3, x7y4, x7y5, x7y6 };
circles[0] = colOne; circles[1] = colTwo; circles[2] = colThree; circles[3] = colFour; circles[4] = colFive; circles[5] = colSix; circles[6] = colSeven;
}
private void changeColor(int x, int y, int color)
{
if (color == 0) { circles[x][y].setImage(0); }
else if (color == 1) { circles[x][y].setImage(1); }
else if (color == 2) { circles[x][y].setImage(2); }
Application.DoEvents();
}
}
這已被要求,並回答了很多次的SO。請參閱此頁面右側的「相關」列。 –