我有一个具有 3 层深的选项卡控件的 winform 应用程序。我正在使用下面的类动态地为选项卡着色。当它为嵌入的 tabcontrol 着色时,它会很合适。
A first chance exception of type 'System.ComponentModel.Win32Exception' occurred in System.Windows.Forms.dll
我需要为那些做一些不同的事情吗?如果我注释掉对 tabRenderer 的嵌入式表单调用,那么我不会收到这些错误。我没有正确处理我的 TabRenderer 对象吗?
可能完全是另外一回事吗?我嵌入选项卡控件的方式?
我的程序目前看起来的一个例子在这里 -->
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来自DevFiles
如您所见,有 3 层选项卡控件。这在程序中发生了两次,都导致了上述错误。因为有 5 个选项卡控件,所以总共有 6 次对 tabRenderer 的调用。1 个顶级,3 个二级和 2 个三级。
用于为选项卡控件着色的代码:
public class psTabRenderer
{
private TabControl _tabControl;
private Color _fillColor;
private Color _selectedFillColor;
private Color _textColor;
private Color _selectedTextColor;
public psTabRenderer(TabControl tabControl, Color fillColor, Color selectedFillColor, Color textColor, Color selectedTextColor)
{
_tabControl = tabControl;
_fillColor = fillColor;
_selectedFillColor = selectedFillColor;
_textColor = textColor;
_selectedTextColor = selectedTextColor;
_tabControl.DrawMode = TabDrawMode.OwnerDrawFixed;
_tabControl.DrawItem += TabControlDrawItem;
}
private void TabControlDrawItem(object sender, DrawItemEventArgs e)
{
TabPage currentTab = _tabControl.TabPages[e.Index];
Rectangle itemRect = _tabControl.GetTabRect(e.Index);
var fillBrush = new SolidBrush(_fillColor);
var textBrush = new SolidBrush(_textColor);
var sf = new StringFormat
{
Alignment = StringAlignment.Center,
LineAlignment = StringAlignment.Center
};
//If we are currently painting the Selected TabItem we'll
//change the brush colors and inflate the rectangle.
if (Convert.ToBoolean(e.State & DrawItemState.Selected))
{
fillBrush.Color = _selectedFillColor;
textBrush.Color = _selectedTextColor;
itemRect.Inflate(2, 2);
}
//Set up rotation for left and right aligned tabs
if (_tabControl.Alignment == TabAlignment.Left || _tabControl.Alignment == TabAlignment.Right)
{
float rotateAngle = 90;
if (_tabControl.Alignment == TabAlignment.Left)
rotateAngle = 270;
var cp = new PointF(itemRect.Left + (itemRect.Width / 2), itemRect.Top + (itemRect.Height / 2));
e.Graphics.TranslateTransform(cp.X, cp.Y);
e.Graphics.RotateTransform(rotateAngle);
itemRect = new Rectangle(-(itemRect.Height / 2), -(itemRect.Width / 2), itemRect.Height, itemRect.Width);
}
//Next we'll paint the TabItem with our Fill Brush
e.Graphics.FillRectangle(fillBrush, itemRect);
//Now draw the text.
e.Graphics.DrawString(currentTab.Text, e.Font, textBrush, (RectangleF)itemRect, sf);
//Reset any Graphics rotation
e.Graphics.ResetTransform();
//Finally, we should Dispose of our brushes.
fillBrush.Dispose();
textBrush.Dispose();
}
}
这就是我所说的:
private void frmMCPEmployment_Load(object sender, EventArgs e)
{
FormPaint();
}
public void FormPaint()
{
// ToDo: This call to the Tab Renderer is throwing a Win32 "Error Creating Window Handle"
new psTabRenderer(tclEmployment, Color.LightSteelBlue, Color.Khaki, Color.Black, Color.Black);
}