Question

运行嵌入式Windows 7并节省性能时，我将视觉样式从Windows 7 basic更改为Windows classic。

在其上运行带有自定义进度栏的WinForms appl。错误在Rectangle.Inflate(x,y);

行上

在Windows 7基本主题上一切都很好，但是在我切换到Windows Classic之后，出现上述错误。找不到有关此的任何信息，反正还有吗？

这是我的自定义控件

public class CustomProgressBar : ProgressBar
    {
        //Property to set to decide whether to print a % or Text
        public ProgressBarDisplayText DisplayStyle { get; set; }

        //Property to hold the custom text
        public String CustomText { get; set; }

        public CustomProgressBar()
        {
            // Modify the ControlStyles flags -> OptimizedDoubleBuffer to avoid flickering text          
            SetStyle(ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint | ControlStyles.OptimizedDoubleBuffer, true);

        }

        protected override void OnPaint(PaintEventArgs e)
        {
            Rectangle rect = ClientRectangle;
            Graphics g = e.Graphics;

            ProgressBarRenderer.DrawHorizontalBar(g, rect);
            rect.Inflate(-3, -3); //here im getting the error
            if (Value > 0)
            {
                // As we doing this ourselves we need to draw the chunks on the progress bar
                Rectangle clip = new Rectangle(rect.X, rect.Y, (int)Math.Round(((float)Value / Maximum) * rect.Width), rect.Height);
                ProgressBarRenderer.DrawHorizontalChunks(g, clip);
            }

            // Set the Display text (Either a % amount or our custom text
            string text = DisplayStyle == ProgressBarDisplayText.Percentage ? Value.ToString() + '%' : CustomText;


            using (Font f = new Font(FontFamily.GenericSerif, 14))
            {

                SizeF len = g.MeasureString(text, f);
                // Calculate the location of the text (the middle of progress bar)
                // Point location = new Point(Convert.ToInt32((rect.Width / 2) - (len.Width / 2)), Convert.ToInt32((rect.Height / 2) - (len.Height / 2)));
                Point location = new Point(Convert.ToInt32((Width / 2) - len.Width / 2), Convert.ToInt32((Height / 2) - len.Height / 2));
                // The commented-out code will centre the text into the highlighted area only. This will centre the text regardless of the highlighted area.
                // Draw the custom text
                g.DrawString(text, f, Brushes.Red, location);
            }
        }
    }

这是我的堆栈跟踪

System.InvalidOperationException: Visual Styles-related operation resulted in an error because no visual style is currently active.
   at System.Windows.Forms.VisualStyles.VisualStyleRenderer.IsCombinationDefined(String className, Int32 part)
   at System.Windows.Forms.VisualStyles.VisualStyleRenderer..ctor(String className, Int32 part, Int32 state)
   at System.Windows.Forms.ProgressBarRenderer.InitializeRenderer(VisualStyleElement element)
   at System.Windows.Forms.ProgressBarRenderer.DrawHorizontalBar(Graphics g, Rectangle bounds)
   at YonatanDataReader2.CustomProgressBar.OnPaint(PaintEventArgs e)
   at System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, Int16 layer)
   at System.Windows.Forms.Control.WmPaint(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

编辑

由于客户计算机上的某些原因，即使检查了视觉样式，并且他仍然使用Windows 7 Aero主题仍然出现上述错误，我也尝试设置Application.SetCompatibleTextRenderingDefault(true);并没有帮助

与视觉样式相关的操作在Windows经典主题上导致错误

0 个答案: