winform 窗体四周添加阴影 示例源码

窗体四周添加阴影

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Windows.Forms;
using Y.Utils.WindowsUtils.APIUtils;namespace ShadowForm
{
    public partial class Form1 : Form
    {
        private const int CS_DropSHADOW = 0x20000;
        private const int GCL_STYLE = (-26);        [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);
        public Form1()
        {
            InitializeComponent();
            // 在构造中调用此函数 
            SetClassLong(this.Handle, GCL_STYLE, GetClassLong(this.Handle, GCL_STYLE) | CS_DropSHADOW);
        }        private void Form1_Load(object sender, EventArgs e)
        {        }
        protected override void OnMouseMove(MouseEventArgs e)
        {
            base.OnMouseMove(e);
            if (e.Button == MouseButtons.Left)
            {
                FormStyleAPI.ReleaseCapture();
                FormStyleAPI.SendMessage(Handle, FormStyleAPI.WM_NCLBUTTONDOWN, FormStyleAPI.HTCAPTION, 0);
            }
        }
    }
}