更新图片框控件的问题

Question

我在同一表格上有两个控件。两个控件都包含ObjectListView控件。一个listview是使用visual studio中的图形编辑器创建的。这个没有引起任何问题。另一个列表视图是在运行时以编程方式创建的。我已经为每个控件定义了一个事件处理程序，当热门项目发生变化时它们会被调用，并且它们都会在它们应该被触发两个事件处理程序都调用相同的代码来更新图片框控件。问题是当程序化定义的listview要求时，图片框不会更新。我很肯定事件处理程序被调用，因为我的代码写入文本文件以及更新图片框。文本文件会更新，但图片框不会更新。我已经尝试更新，无效和刷新PicutureBox以及父表单，但我无法让它更新。

我不确定这是ObjectListView问题还是标准的WinForms问题。我意识到我的问题很模糊，但我不知道如何在不发布所有代码的情况下澄清它。任何建议将不胜感激。

以下是事件处理程序调用的代码：

    public void ShowBitmap(object sender, HotItemChangedEventArgs e, ObjectListView lv, string type)
    {

        ObjectListView olv = sender as ObjectListView;
        if (sender == null)
        {
            return;
        }

        switch (e.HotCellHitLocation)
        {
            case HitTestLocation.Nothing:
                break;
            case HitTestLocation.Group:
                break;
            case HitTestLocation.GroupExpander:
                break;
            default:
                if (e.HotColumnIndex == 0)
                {
                    pictureBox1.Hide();
                    pictureBox1.BorderStyle = BorderStyle.FixedSingle;
                    int rowIndex = e.HotRowIndex;
                    string text = "";
                    if (type == "Main Parts")
                    {
                        TypedObjectListView<MainRadanProjectPartsPart> tlist = new TypedObjectListView<MainRadanProjectPartsPart>(lv);
                        text = tlist.Objects[rowIndex].Symbol;
                    }
                    else if (type == "Parts")
                    {
                        TypedObjectListView<RadanProjectPartsPart> tlist = new TypedObjectListView<RadanProjectPartsPart>(lv);
                        text = tlist.Objects[rowIndex].Symbol;
                    }
                    else if (type == "Nests")
                    {
                        TypedObjectListView<MainRadanProjectNestsNest> tlist = new TypedObjectListView<MainRadanProjectNestsNest>(lv);
                        text = tlist.Objects[rowIndex].FileName;
                    }

                    if (text != null)
                    {
                        Point screenCoords = Cursor.Position;
                        Point controlRelatedCoords = lv.PointToClient(screenCoords);

                        if (controlRelatedCoords.Y < oldCursorPosition.Y)
                        {
                            pictureBox1.Location = controlRelatedCoords;
                            int xPos = controlRelatedCoords.X;
                            int yPos = controlRelatedCoords.Y + 60;
                            pictureBox1.Location = new Point(xPos, yPos);
                        }
                        else if (controlRelatedCoords.Y > oldCursorPosition.Y)
                        {
                            pictureBox1.Location = controlRelatedCoords;
                            int xPos = controlRelatedCoords.X;
                            //int yPos = controlRelatedCoords.Y - pictureBox1.Height;
                            int yPos = controlRelatedCoords.Y - pictureBox1.Height + 30;
                            pictureBox1.Location = new Point(xPos, yPos);
                        }

                        pictureBox1.Show();
                        pictureBox1.BringToFront();
                        olvTreeViewMainParts.Focus();
                        lv.Focus();
                        pictureBox1.Visible = true;
                        DrawSymbol(text);

                        oldCursorPosition = controlRelatedCoords;   // save the cursor position to track cursor direction between calls
                    }
                    else
                    {
                        DrawSymbol("");
                    }
                }
                else
                {
                    pictureBox1.Hide();
                }
                break;
        }
    }

这是programmaticaly定义的listview的事件处理程序：

     // track the cursor as it moves over the items in the listview
    private void olvPartsListView_HotItemChanged(object sender, HotItemChangedEventArgs e)
    {
        ShowBitmap(sender, e, olvPartsListView, "Parts"); 
    }