winform窗体 小程序【移动窗体和阴影】

窗体无边框设置后无法移动，引用API 使其获得功能

移动

//窗体移动API
[DllImport("user32.dll")]
public static extern bool ReleaseCapture();
[DllImport("user32.dll")]
public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int IParam);
public const int WM_SYSCOMMAND = 0x0112;
public const int SC_MOVE = 0xF010;
public const int HTCAPTION = 0x0002;
[DllImport("user32")]
private static extern int SendMessage(IntPtr hwnd, int wMsg, int wParam, IntPtr lParam);
private const int WM_SETREDRAW = 0xB;


//将方法复制到代码中，在将窗体的MouseDown（按下事件）委托此方法
private void Form1_MouseDown(object sender, MouseEventArgs e)
{
    if (this.WindowState == FormWindowState.Normal)
    {
        ReleaseCapture();
        SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);
    }
}

阴影

1、添加命名空间：
using System.Runtime.InteropServices;  

2、定义常量值及函数：
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);


3、构造方法下引用：
SetClassLong(this.Handle, GCL_STYLE, GetClassLong(this.Handle, GCL_STYLE) | CS_DropSHADOW);  

案例

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;

namespace WindowsFormsApplication3
{
    public partial class Form1 : Form
    {
        //窗体移动API
        [DllImport("user32.dll")]
        public static extern bool ReleaseCapture();
        [DllImport("user32.dll")]
        public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int IParam);
        public const int WM_SYSCOMMAND = 0x0112;
        public const int SC_MOVE = 0xF010;
        public const int HTCAPTION = 0x0002;
        [DllImport("user32")]
        private static extern int SendMessage(IntPtr hwnd, int wMsg, int wParam, IntPtr lParam);
        private const int WM_SETREDRAW = 0xB;

        //窗体阴影API
        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();

            SetClassLong(this.Handle, GCL_STYLE, GetClassLong(this.Handle, GCL_STYLE) | CS_DropSHADOW); 
        }


        private void Form1_MouseDown(object sender, MouseEventArgs e)
        {
            if (this.WindowState == FormWindowState.Normal)
            {
                ReleaseCapture();
                SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);
            }
        }

    }
}

案例、建立一个无边框窗体

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;

namespace WindowsFormsApplication2
{
    public partial class Form4 : Form
    {
        //窗体移动API
        [DllImport("user32.dll")]
        public static extern bool ReleaseCapture();
        [DllImport("user32.dll")]
        public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int IParam);
        public const int WM_SYSCOMMAND = 0x0112;
        public const int SC_MOVE = 0xF010;
        public const int HTCAPTION = 0x0002;
        [DllImport("user32")]
        private static extern int SendMessage(IntPtr hwnd, int wMsg, int wParam, IntPtr lParam);
        private const int WM_SETREDRAW = 0xB;


        public Form4()
        {
            InitializeComponent();
        }


        private void Form1_MouseDown(object sender, MouseEventArgs e)
        {
            if (this.WindowState == FormWindowState.Normal)
            {
                ReleaseCapture();
                SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);
            }
        }

        //鼠标进入时发生
        private void pictureBox2_MouseEnter(object sender, EventArgs e) 
        {
            pictureBox2.BackgroundImage = Image.FromFile(@"e:/c2.png"); //改变背景图
        }                                               // @  --字符串的原样输出，加不加都像          
                                                        //e:/c2.png --图片的地址 

        //鼠标离开时时发生 -- 刚开始默认图片是c1.png
        private void pictureBox2_MouseLeave(object sender, EventArgs e)
        {
            pictureBox2.BackgroundImage = Image.FromFile(@"e:/c1.png");
        }


        //鼠标按下时发生
        private void pictureBox2_MouseDown(object sender, MouseEventArgs e)
        {
            pictureBox2.BackgroundImage = Image.FromFile(@"e:/c3.png");
        }

        //点击时发生
        private void pictureBox2_Click(object sender, EventArgs e)
        {
            this.WindowState = FormWindowState.Maximized;   //最大化


           // this.Close();      关闭
        }

    }
}

背景图片的设置

pictureBox1.BackgroundImage = Image.FromFile(" 图片路径地址 " );