c#實現Form窗體始終在桌面最前端顯示

方法一：

//調用API

[System.Runtime.InteropServices.DllImport("user32", CharSet = System.Runtime.InteropServices.CharSet.Auto, ExactSpelling = true)]

public static extern IntPtr GetFocus(); //獲得本窗體的句柄

[System.Runtime.InteropServices.DllImport("user32", EntryPoint = "SetForegroundWindow")]

public static extern bool SetFocus(IntPtr hWnd);//設置此窗體為活動窗體


// 定義變量,句柄類型

public IntPtr han;

private void Form1_Load(object sender, EventArgs e){

//在窗體加載的時候給變量賦值,即將當前窗體的句柄賦給變量

han = this.Handle;

}
private void timer1_Tick(object sender, EventArgs e){

// 加載一個定時器控件,驗證當前WINDOWS句柄是否和本窗體的句柄一樣,如果不一樣,則激活本窗體

if (han != GetFocus()){

SetFocus(han);

}

this.WindowState = FormWindowState.Normal;

}

 

c#本來就有Focus()方法，我沒用DllImport，試過下面幾個方法都不行

control.Activate();
control.TopMost = true;
control.Focus();

 

 

方法二：

[System.Runtime.InteropServices.DllImport("user32")]
private static extern IntPtr GetActiveWindow();//獲取當前窗體的活動狀態

// 判斷當前窗口是否處於活動狀態的方法

private bool ThisIsActive(){ return (GetActiveWindow() == this.Handle);}

private void timer1_Tick(object sender, EventArgs e){

if (!ThisIsActive()){

this.Activate();

}

this.WindowState = FormWindowState.Normal;

}

 

方法三：

[DllImport("user32")]    
private    static    extern    IntPtr    FindWindow(string    lpClassName,string    lpWindowName);    
     
[DllImport("user32")]    
private    static    extern    IntPtr    SetParent(IntPtr    hWndChild,    IntPtr    hWndNewParent);    
     
//在窗體On_Load事件中添加（Santos的代碼）：    
IntPtr    hDeskTop=FindWindow("Progman",    "Program    Manager");    
SetParent(this.Handle,hDeskTop);

 

方法四：

[System.Runtime.InteropServices.DllImport("user32.dll")]
static extern bool SetForegroundWindow(IntPtr hWnd);

 

拓展：

private void Form1_Load(object sender, EventArgs e)
{
    this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;

    this.ShowInTaskbar = false;
    this.TopMost = true;
    this.timer1.Interval = 1;
    this.timer1.Enabled = true;
    this.WindowState = FormWindowState.Maximized;
}

private void timer1_Tick(object sender, EventArgs e)
{
    SetForegroundWindow(this.Handle);
}