我在winform里面想用用户控件实现win xp那样的具有蓝色立体边框的窗口，我该怎么做

要在WinForm中实现Win XP风格的窗口，你需要使用自定义绘制来绘制窗口的边框和标题栏。下面是一个简单的步骤：

1. 创建一个继承自 System.Windows.Forms.Form 的自定义窗体。

2. 设置窗体的 ControlBox 属性为 false，这将隐藏窗体的标准控件（最小化、最大化、关闭按钮）。

3. 重写 OnPaint 方法并绘制窗体的边框和标题栏。你可以使用 System.Windows.Forms.ControlPaint 类的 DrawBorder3D 和 DrawCaption 方法来帮助你绘制窗口的外观。

4. 在 OnMouseDown、OnMouseMove 和 OnMouseUp 方法中处理用户的鼠标事件，以实现拖动窗口和调整窗口大小的功能。

5. 在 OnResize 方法中重新计算窗体的大小和位置，并调用 Invalidate 方法来触发重新绘制窗口。

下面是一些示例代码，可以帮助你入门：

public class CustomForm : System.Windows.Forms.Form
{
    private const int WM_NCHITTEST = 0x84;
    private const int HTCLIENT = 0x1;
    private const int HTCAPTION = 0x2;
    private const int HTLEFT = 0x10;
    private const int HTRIGHT = 0x11;
    private const int HTTOP = 0x12;
    private const int HTTOPLEFT = 0x13;
    private const int HTTOPRIGHT = 0x14;
    private const int HTBOTTOM = 0x15;
    private const int HTBOTTOMLEFT = 0x16;
    private const int HTBOTTOMRIGHT = 0x17;

    private Rectangle _captionRect;
    private Rectangle _borderRect;

    public CustomForm()
    {
        this.ControlBox = false;
        this.DoubleBuffered = true;
    }

    protected override void OnPaint(PaintEventArgs e)
    {
        base.OnPaint(e);

        // 绘制窗口边框和标题栏
        _captionRect = new Rectangle(0, 0, this.Width, 30);
        _borderRect = new Rectangle(0, 0, this.Width - 1, this.Height - 1);
        ControlPaint.DrawBorder3D(e.Graphics, _borderRect, Border3DStyle.Sunken);
        ControlPaint.DrawCaption(e.Graphics, _captionRect, CaptionText, Font, 
                                 SystemColors.ActiveCaptionText, SystemColors.ActiveCaption, 
                                 TextFormatFlags.VerticalCenter | TextFormatFlags.HorizontalCenter);

        // 绘制客户区域
        Rectangle clientRect = new Rectangle(1, _captionRect.Height + 1, this.Width - 2, this.Height - _captionRect.Height - 2);
        e.Graphics.FillRectangle(Brushes.White, clientRect);
    }

    protected override void OnMouseDown(MouseEventArgs e)
    {
        base.OnMouseDown(e);

        // 处理鼠标按下事件，实现拖动窗口和调整窗口大小的功能
        if (e.Button == MouseButtons.Left && _captionRect.Contains(e.Location))
        {
            ReleaseCapture();
            SendMessage(Handle, WM_NCLBUTTONDOWN, HTCAPTION, 0);
        }
        else if (e.Button == MouseButtons.Left && _borderRect.Contains(e.Location))
        {
            if (e.Location.X < 5)
            {
                ReleaseCapture();
                SendMessage(Handle, WM_NCLBUTTONDOWN, HTLEFT, 0);
            }
            else if (e.Location.X > this.Width - 5)
            {
                ReleaseCapture();
                SendMessage(Handle, WM_NCLBUTTONDOWN, HTRIGHT, 0);
            }
            else if (e.Location.Y < _captionRect.Height + 5)
            {
                ReleaseCapture();
                SendMessage(Handle, WM_NCLBUTTONDOWN, HTTOP, 0);
            }
            else if (e.Location.Y > this.Height - 5)
            {
                ReleaseCapture();
                SendMessage(Handle, WM_NCLBUTTONDOWN, HTBOTTOM, 0);
            }
            else if (e.Location.X < _captionRect.Height + 5 && e.Location.Y < _captionRect.Height + 5)
            {
                ReleaseCapture();
                SendMessage(Handle, WM_NCLBUTTONDOWN, HTTOPLEFT, 0);
            }
            else if (e.Location.X > this.Width - 5 && e.Location.Y < _captionRect.Height + 5)
            {
                ReleaseCapture();
                SendMessage(Handle, WM_NCLBUTTONDOWN, HTTOPRIGHT, 0);
            }
            else if (e.Location.X < _captionRect.Height + 5 && e.Location.Y > this.Height - 5)
            {
                ReleaseCapture();
                SendMessage(Handle, WM_NCLBUTTONDOWN, HTBOTTOMLEFT, 0);
            }
            else if (e.Location.X > this.Width - 5 && e.Location.Y > this.Height - 5)
            {
                ReleaseCapture();
                SendMessage(Handle, WM_NCLBUTTONDOWN, HTBOTTOMRIGHT, 0);
            }
        }
    }

    protected override void OnMouseMove(MouseEventArgs e)
    {
        base.OnMouseMove(e);

        // 更改鼠标指针的形状，以指示用户可以拖动窗口或调整窗口大小
        if (_captionRect.Contains(e.Location))
        {
            Cursor = Cursors.SizeAll;
        }
        else if (_borderRect.Contains(e.Location))
        {
            if (e.Location.X < 5 || e.Location.X > this.Width - 5)
            {
                Cursor = Cursors.SizeWE;
            }
            else if (e.Location.Y < _captionRect.Height + 5 || e.Location.Y > this.Height - 5)
            {
                Cursor = Cursors.SizeNS;
            }
            else if (e.Location.X < _captionRect.Height + 5 && e.Location.Y < _captionRect.Height + 5 ||
                     e.Location.X > this.Width - 5 && e.Location.Y < _captionRect.Height + 5 ||
                     e.Location.X < _captionRect.Height + 5 && e.Location.Y > this.Height - 5 ||
                     e.Location.X > this.Width - 5 && e.Location.Y > this.Height - 5)
            {
                Cursor = Cursors.SizeNWSE;
            }
            else
            {
                Cursor = Cursors.Default;
            }
        }
        else
        {
            Cursor = Cursors.Default;
        }
    }

    protected override void OnMouseUp(MouseEventArgs e)
    {
        base.OnMouseUp(e);

        // 还原鼠标指针的形状
        Cursor = Cursors.Default;
    }

    protected override void OnResize(EventArgs e)
    {
        base.OnResize(e);

        // 触发重新绘制窗口
        Invalidate();
    }

    protected override CreateParams CreateParams
    {
        get
        {
            CreateParams cp = base.CreateParams;
            cp.Style |= 0x20000; // WS_MINIMIZEBOX
            return cp;
        }
    }

    [DllImport("user32.dll")]
    private static extern bool ReleaseCapture();

    [DllImport("user32.dll")]
    private static extern IntPtr SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);
}

这是一个简单的例子，你可以根据自己的需要进行修改和扩展。