1.需要匯入 System.Runtime.InteropServices 命名空間
2.宣告 ShowWindowAsync 函數
[DllImport("user32.dll")]
private static extern bool ShowWindowAsync(
IntPtr hWnd,
int nCmdShow
);
3.宣告 ShowWindow函數
[DllImport("user32.dll")]
public static extern int ShowWindow(
int hwnd,
int nCmdShow
);
4.宣告API常數定義
//API 常數定義
private const int SW_HIDE = 0;
private const int SW_NORMAL = 1;
private const int SW_MAXIMIZE = 3;
private const int SW_SHOWNOACTIVATE = 4;
private const int SW_SHOW = 5;
private const int SW_MINIMIZE = 6;
private const int SW_RESTORE = 9;
private const int SW_SHOWDEFAULT = 10;
5.上述函數功能相同，都是用來設定視窗大小，不同的是宣告的型態不一樣需轉型。
ShowWindowAsync(this.Handle, SW_MINIMIZE);
ShowWindow((int)this.Handle, SW_MINIMIZE);
6.若是把int 改成IntPtr ，使用ShowWindow就不用轉型，所以在宣告時就可以考慮資料型態，必免轉型所耗的資源。
[DllImport("user32.dll")]
public static extern int ShowWindow(
int hwnd,
int nCmdShow
);
C#完整範例
using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace CS_WindowsResize
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
//API 常數定義
private const int SW_HIDE = 0;
private const int SW_NORMAL = 1;
private const int SW_MAXIMIZE = 3;
private const int SW_SHOWNOACTIVATE = 4;
private const int SW_SHOW = 5;
private const int SW_MINIMIZE = 6;
private const int SW_RESTORE = 9;
private const int SW_SHOWDEFAULT = 10;
[DllImport("user32.dll")]
private static extern bool ShowWindowAsync(
IntPtr hWnd,
int nCmdShow
);
[DllImport("user32.dll")]
public static extern int ShowWindow(
int hwnd,
int nCmdShow
);
private void button1_Click(object sender, EventArgs e)
{
//最小化
ShowWindowAsync(this.Handle, SW_MINIMIZE);
}
private void button2_Click(object sender, EventArgs e)
{
//最大化
ShowWindowAsync(this.Handle, SW_MAXIMIZE);
}
private void button3_Click(object sender, EventArgs e)
{
//還原
ShowWindowAsync(this.Handle, SW_RESTORE);
}
private void button4_Click(object sender, EventArgs e)
{
//最小化
ShowWindow((int)this.Handle, SW_MINIMIZE);
}
private void button5_Click(object sender, EventArgs e)
{
//最大化
ShowWindow((int)this.Handle, SW_MAXIMIZE);
}
private void button6_Click(object sender, EventArgs e)
{
//還原
ShowWindow((int)this.Handle, SW_RESTORE);
}
}
}
转载自：http://www.dotblogs.com.tw/yc421206/archive/2009/07/06/9140.aspx