ProgressBar的颜色没有改变c#

Question

我的要求是每次单击按钮时将进度条的颜色更改为红色。我不想注释掉 Application.EnableVisualStyles()。

所以我尝试使用 SendMessage。我的代码：

    [DllImport("user32.dll")]
    private static extern bool SendMessage(IntPtr hWnd, Int32 msg, Int32 wParam, Int32 lParam);

    private const Int32 WM_USER = 0x0400;
    private const Int32 CCM_FIRST = 0x2000;
    private const Int32 PBM_SETBARCOLOR = WM_USER + 9;
    private const Int32 PBM_SETBKCOLOR = CCM_FIRST + 1;

    public Form1()
    {
        InitializeComponent();

    }

    private void button1_Click(object sender, EventArgs e)
    {
        this.Invoke((MethodInvoker)delegate
        {
            SendMessage(this.progressBar1.Handle, PBM_SETBARCOLOR, 0, ColorTranslator.ToWin32(Color.Red));
            SendMessage(this.progressBar1.Handle, PBM_SETBKCOLOR, 0, ColorTranslator.ToWin32(Color.Red));
            progressBar1.Style = ProgressBarStyle.Continuous;
            progressBar1.Value = progressBar1.Maximum;
        });
    }

它不工作。我不知道为什么。你能帮忙吗

Answer 1

如果您想将 ProgressBar 颜色从初始 Green 更改为 Red（这是一种标准状态），您可以这样做

https://msdn.microsoft.com/ru-ru/library/windows/desktop/bb760850(v=vs.85).aspx

  // 1040 - PBM_SETSTATE
  // 1 - green  (in progress) 
  // 2 - red    (error)
  // 3 - yellow (paused), 
  SendMessage(progressBar1.Handle, 1040, 2, 0);

实现：

  this.Invoke(() => {
    progressBar1.Value = progressBar1.Maximum;
    progressBar1.Style = ProgressBarStyle.Continuous;

    SendMessage(progressBar1.Handle, 1040, 2, 0); 
  });