C#中给进度条加上文字

using System.Runtime.InteropServices;

[DllImport("user32.dll")]

static extern IntPtr GetWindowDC(IntPtr hWnd);

[DllImport("user32.dll")]

static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);

public class SubWindow : NativeWindow

{

private Control control;

private string text = "null";

private Color foreColor = SystemColors.ControlText;

private Font font = SystemFonts.MenuFont;

public Font Font

{

set

{

font = value;

if (control != null)

control.Invalidate();

}

}

public Color ForeColor

{

set

{

foreColor = value;

if (control != null)

control.Invalidate();

}

}

public string Text

{

set

{

text = value;

if (control != null)

control.Invalidate();

}

}

public Control Control {

set

{

control = value;

if (control != null)

{

AssignHandle(control.Handle);

control.Invalidate();

}

}

}

protected override void WndProc(ref Message m)

{

const int WM_PAINT = 0x000F;

base.WndProc(ref m);

if (control == null) return;

switch (m.Msg)

{

case WM_PAINT:

IntPtr vDC = GetWindowDC(m.HWnd);

Graphics vGraphics = Graphics.FromHdc(vDC);

StringFormat vStringFormat = new StringFormat();

vStringFormat.Alignment = StringAlignment.Center;

vStringFormat.LineAlignment = StringAlignment.Center;

vGraphics.DrawString(text, font, new SolidBrush(foreColor),

new Rectangle(0, 0, control.Width, control.Height), vStringFormat);

ReleaseDC(m.HWnd, vDC);

break;

}

}

}

private void Form1_Load(object sender, EventArgs e)

{

SubWindow vSubWindow = new SubWindow();

vSubWindow.Font = Font;

vSubWindow.Text = "Zswang 路过";

vSubWindow.ForeColor = Color.Blue;

vSubWindow.Control = progressBar1;

}