C#

我试图有一个空的窗体窗口,但使用工具窗口样式。 但是,调用Show()导致以下异常:

Win32Exception:该参数不正确。

NativeErrorCode:87

System.Windows.Forms.Form.UpdateLayered()在System.Windows.Forms.Control.WmCreate(消息&m)在System.Windows.Forms.Control.WndProc(消息&m)在System.Windows.Forms.Form.WmCreate (Message&m)at System.Windows.Forms.Form.WndProc(Message&m)at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd,Int32 msg,IntPtr wparam,IntPtr lparam)

错误代码87是ERROR_INVALID_PARAMETER。

private class ToolForm : Form {
    public ToolForm() {
        AllowTransparency = true;
        BackColor = System.Drawing.Color.FromArgb(0, 0, 1);
        TransparencyKey = BackColor;
    }

    private const int WS_EX_TOOLWINDOW = 0x00000080;
    protected override CreateParams CreateParams {
        get {
            var cp = base.CreateParams;
            cp.ExStyle = WS_EX_TOOLWINDOW;
            return cp;
        }
    }
}

编辑:

这工作:

public class ToolForm : Form {
    public ToolForm() {
        this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.SizableToolWindow;
        this.AllowTransparency = true;
        this.BackColor = Color.FromArgb(0, 0, 1);
        this.TransparencyKey = this.BackColor;
    }
}

首先尝试使用OR分配而不是纯分配:

cp.ExStyle |= WS_EX_TOOLWINDOW;

如果这不起作用,您可以尝试额外处理以下某些相关样式:

cp.ExStyle |= ( int )(
  WS_EX_LAYERED |
  WS_EX_TRANSPARENT |
  WS_EX_NOACTIVATE |
  WS_EX_TOOLWINDOW );

相关的值是:

WS_EX_LAYERED = 0x00080000,
WS_EX_NOACTIVATE = 0x08000000,
WS_EX_TOOLWINDOW = 0x00000080,
WS_EX_TRANSPARENT = 0x00000020

WS_EX_TRANSPARENT标志可能允许您需要的TransparencyKey = BackColor;而不需要TransparencyKey = BackColor; 线。

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