C# 无边框窗体边框阴影效果

通过下面代码在构造函数中调用方法 SetShadow();

即可实现无边框窗体的阴影效果了

需要添加命名空间 using System.Runtime.InteropServices;

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Drawing;
using System.Runtime.InteropServices;

namespace MQXS
{
public class BaseForm:Form
{
public BaseForm()
{
Initialize();
}
/// <summary>
///
/// </summary>
/// <param name="e"></param>
protected override void OnMouseDown(MouseEventArgs e)
{
base.OnMouseDown(e);
_IsMouseDown = true;
_startPoint = Control.MousePosition;
_oldLocation = this.Location;
}
/// <summary>
///
/// </summary>
/// <param name="e"></param>
protected override void OnMouseMove(MouseEventArgs e)
{
base.OnMouseMove(e);
if (!_IsMouseDown) return;
Point p=Control.MousePosition;
this.Location = new Point(p.X - _startPoint.X + _oldLocation.X, p.Y - _startPoint.Y + _oldLocation.Y);
}
/// <summary>
///
/// </summary>
/// <param name="e"></param>
protected override void OnMouseUp(MouseEventArgs e)
{
base.OnMouseUp(e);
_IsMouseDown = false;
}
/// <summary>
///
/// </summary>
private void Initialize()
{
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
this.StartPosition = FormStartPosition.CenterScreen;
this.SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.OptimizedDoubleBuffer, true);
SetClassLong(this.Handle, GCL_STYLE, GetClassLong(this.Handle, GCL_STYLE) | CS_DropSHADOW); //API函数加载，实现窗体边框阴影效果
}

private Point _oldLocation;
private Point _startPoint;
private bool _IsMouseDown;

#region 窗体边框阴影效果变量申明

private const int CS_DropSHADOW = 0x20000;
private const int GCL_STYLE = (-26);
//声明Win32 API
[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern int SetClassLong(IntPtr hwnd, int nIndex, int dwNewLong);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern int GetClassLong(IntPtr hwnd, int nIndex);

#endregion
}
}

View Code
效果图：



源码下载



模拟API自绘阴影源码下载 如上图