关于backgroundworker（100分！急！在线等）

Question

CheckForIllegalCrossThreadCalls = false;//允许线程交叉管理
或者是  你直接就把  this 传递过去  将UI线程直接扔过去，，给他绝对的控制权
或者通过 委托 自己写一个方法 将委托扔过去  通过委托来调用方法 3种方法最少有2个应该是可行的，，你可以试下

Answer 1

代码有点长：        void BWAnalysis_DoWork(object sender, DoWorkEventArgs e)
        {
            BackgroundWorker worker = sender as BackgroundWorker;
            
            //表示获取特征结果的值
            e.Result = GetBmpFeature(worker, e);
        }        //特征分析结束，显示图片
        void BWAnalysis_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            if (e.Error != null)
                MessageBox.Show(e.Error.Message);
            else if (e.Cancelled)
            {
                textAnalysis.Text = "特征分析过程终止. . . . . .";
                btnCancel.IsEnabled = false;
            }
            else 
            {
                textAnalysis.Text = "完成";                if (null == bmpFeature || 0 == bmpFeature.Count)
                {
                    MessageBox.Show("特征分析失败，没有检测到人脸。", "操作失败", MessageBoxButton.OK,
                            MessageBoxImage.Information);                    //设置按键为不可用
                    btnLast.IsEnabled = false;
                    btnNext.IsEnabled = false;
                    btnGo.IsEnabled = false;
                    btnOK.IsEnabled = false;
                    btnLeftEye.IsEnabled = false;
                    btnRightEye.IsEnabled = false;
                    btnLeftNaris.IsEnabled = false;
                    btnRightNaris.IsEnabled = false;
                    btnLeftMouth.IsEnabled = false;
                    btnRightMouth.IsEnabled = false;
                }
                else
                {
                    textAnalysis.Text = "test";                    ImageBox.Source = (ImageSource)bmpFeature[0]; //想在这里访问，可是exception说这里“另一线程拥有此对象”
                   
                    if (1 == this.bmpFeature.Count)
                    {
                        this.btnNext.IsEnabled = false;
                    }
                }  
            }
            btnCancel.IsEnabled = false;            GetCurrentScreen(ref gridGetCurr);
            SetScreenHide(gridGetCurr);
            SetScreenVisible(gridModify);
            stateManager.CurrentState = StateManager.ScreenStates.ScreenModify;
        }
        
        //更新进度条
        void BWAnalysis_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            progressBar.Value = e.ProgressPercentage;
        }        //获取人脸特征
        private void GetBmpFeature(BackgroundWorker worker, DoWorkEventArgs e)
        {
            if (worker.CancellationPending)
                e.Cancel = true;
                        for (int i = 0; i < picFileNames.Length; i++)
            {
                fDataPic = manager.GetFeature(picFileNames[i]);
                if (null == fDataPic)
                    continue;
                else
                {
                    Bitmap bmp = this.manager.GetFeaturePicture(fDataPic, picFileNames[i]);
                    bmpFeature.Add(BmpChange(bmp));  //bmpFeature是我所说的UI的成员：ArrayList对象，在这个耗时的函数里做了修改
                    bmp.Dispose();
                }
                int percentComplete = (int)((float)i / (float)bmpFeature.Count * 100);
                if (percentComplete > highestPercentageReached)
                {
                    this.highestPercentageReached = percentComplete;
                    worker.ReportProgress(percentComplete);
                }
            }
                       
        }

Answer 2

在 BWAnalysis_RunWorkerCompleted中，对UI元素赋值，全部使用类似如下的语法
label1.Invoke( new MethodInvoker(delegate()
{
  label1.Text="lalala";
}));

Answer 3

CheckForIllegalCrossThreadCalls = false;//允许线程交叉管理

Answer 4

这种写法会引起FORM崩溃滴，请使用11楼的做法。