使用ParallelFor改变列表视图

我有一个函数修改我的listview "inputList"， listview有5列。该函数应该检查列表视图中的单元格，最后一列的单元格将具有绿色背景的"NORMAL"，如果没有什么问题，如果有什么问题，它将在最后一列的单元格中具有红色背景的"ERROR"，并且还将更改与其他列在同一行中的错误单元格的颜色。

有4k项，我知道有这么多项是没有意义的，因为用户不会阅读它们，但我被要求这样做。

我正在使用一个函数与后台工作者，但它不够快，认为并行会更快。但是当我尝试parallelFor时，它冻结了程序。

这是backgroundworker的函数，它正在工作，但太慢了:

private void bw3_DoWork(object sender, DoWorkEventArgs e)
    {
        String tempTrain = "";
        String tempPredic = "";
        String tempNet = "";
        Boolean bTrain;
        Boolean bPredic;
        Boolean bNetErro;
        int n;
        int nNet = 0;
        String tTrain = "";
        String tPredic = "";
        int nList = 0;
        this.Invoke(new MethodInvoker(() => { 
            nList = inputList.Items.Count; 
            nNet = menuNetwork.Items.Count;
            tTrain = dtrainTextBox.Text;
            tPredic = dpredicTextBox.Text;
        }));
        for (int i = 0; i < nList; i++)
        {
            ListViewItem.ListViewSubItem temp1 = new ListViewItem.ListViewSubItem();
            temp1.BackColor = Color.LightGreen;
            temp1.Text = "NORMAL";
            this.Invoke(new MethodInvoker(() =>
            {
                inputList.Items[i].SubItems[0].BackColor = Color.White;
                inputList.Items[i].SubItems[1].BackColor = Color.White;
                inputList.Items[i].SubItems[2].BackColor = Color.White;
                tempTrain = String.Format("{0}''{1}", tTrain, inputList.Items[i].SubItems[1].Text);
                tempPredic = String.Format("{0}''{1}", tPredic, inputList.Items[i].SubItems[2].Text);
                tempNet = (String)inputList.Items[i].SubItems[0].Tag;
            }));
            bTrain = (!File.Exists(tempTrain));
            bPredic = (!File.Exists(tempPredic));
            bNetErro = !(int.TryParse(tempNet, out n));       
            if (!bNetErro)
            {
                if (!(n < nNet))
                {
                    bNetErro = true;
                }
            }
            this.Invoke(new MethodInvoker(delegate
            {
                if (bTrain) inputList.Items[i].SubItems[1].BackColor = Color.Red;
                if (bPredic) inputList.Items[i].SubItems[2].BackColor = Color.Red;
                if (bNetErro) inputList.Items[i].SubItems[0].BackColor = Color.Red;
                if (bTrain | bPredic | bNetErro) { temp1.Text = "Erro"; temp1.BackColor = Color.Red; }
                try { inputList.Items[i].SubItems[4] = temp1; }
                catch (ArgumentOutOfRangeException) { inputList.Items[i].SubItems.Add(temp1); }
            }));
        }
    }

这是ParallelFor函数，程序停止工作，即使我尝试一个非常小的例子，只有项目。

 private void tent1()
    {
        ParallelOptions options = new ParallelOptions();
        options.MaxDegreeOfParallelism = 4;
        String tempTrain = "";
        String tempPredic = "";
        String tempNet = "";
        String tTrain = dtrainTextBox.Text;
        String tPredic = dpredicTextBox.Text;
        Boolean bTrain;
        Boolean bPredic;
        Boolean bNetErro;
        int n;
        int nNet = networkList.Items.Count;
        Parallel.For(0, inputList.Items.Count,
               i =>
        {
            ListViewItem.ListViewSubItem temp1 = new ListViewItem.ListViewSubItem();
            temp1.BackColor = Color.LightGreen;
            temp1.Text = "NORMAL";
            Console.WriteLine(i);
            this.Invoke(new MethodInvoker(() =>
            {
                inputList.Items[i].SubItems[0].BackColor = Color.White;
                inputList.Items[i].SubItems[1].BackColor = Color.White;
                inputList.Items[i].SubItems[2].BackColor = Color.White;
                tempTrain = String.Format("{0}''{1}", tTrain, inputList.Items[i].SubItems[1].Text);
                tempPredic = String.Format("{0}''{1}", tPredic , inputList.Items[i].SubItems[2].Text);
                tempNet = (String)inputList.Items[i].SubItems[0].Tag;
            }));
            bTrain = (!File.Exists(tempTrain));
            bPredic = (!File.Exists(tempPredic));
            bNetErro = !(int.TryParse(tempNet, out n));
            if (!bNetErro)
            {
                if (!(n < nNet))
                {
                    bNetErro = true;
                }
            }
            this.Invoke(new MethodInvoker(delegate
            {
                if (bTrain) inputList.Items[i].SubItems[1].BackColor = Color.Red;
                if (bPredic) inputList.Items[i].SubItems[2].BackColor = Color.Red;
                if (bNetErro) inputList.Items[i].SubItems[0].BackColor = Color.Red;
                if (bTrain | bPredic | bNetErro) { temp1.Text = "Erro"; temp1.BackColor = Color.Red; }
                try { inputList.Items[i].SubItems[4] = temp1; }
                catch (ArgumentOutOfRangeException) { inputList.Items[i].SubItems.Add(temp1); }
            }));
        });
    }

如何将listview的所有项复制到没有引用的List中?我认为直接添加/修改listview和调用会减慢函数的速度，因此创建:List<ListViewItem> tList

我将修改tList中的所有内容，然后使用inputList.Items.AddRange(tList.ToArray());这将删除循环内的所有调用。

    ListViewItem[] tItemsTemp = null;
this.Invoke(new MethodInvoker(() =>
            {
                tItemsTemp = new ListViewItem[inputList.Items.Count];
                inputList.Items.CopyTo(tItemsTemp, 0);
                nList = inputList.Items.Count;
                nNet = menuNetwork.Items.Count;
                tTrain = dtrainTextBox.Text;
                tPredic = dpredicTextBox.Text;
            }));
            List<ListViewItem> tList = new List<ListViewItem>(tItemsTemp);
            ListViewItem[] tItems = (ListViewItem[]) tItemsTemp.Clone();
    //Modifies the list or array of listviewitems
this.Invoke(new MethodInvoker(delegate 
    { 
        inputList.Items.Clear(); 
        // Just one of them,not the 3,just showing how i would call them.
        inputList.Items.AddRange(tItems);
        inputList.Items.AddRange(tItemsTemp);
        inputList.Items.AddRange(tList.ToArray());
    }));

但是tItemsTemp,tItems,tList都是引用…如何在创建引用时进行复制?