第WPF實現(xiàn)基礎控件之托盤的示例代碼項目使用MIT開源許可協(xié)議。

新建NotifyIcon自定義控件繼承自FrameworkElement。

創(chuàng)建托盤程序主要借助與Win32API:

注冊窗體對象RegisterClassEx。注冊消息獲取對應消息標識IdRegisterWindowMessage。創(chuàng)建窗體（本質上托盤在創(chuàng)建時需要一個窗口句柄，完全可以將主窗體的句柄給進去，但是為了更好的管理消息以及托盤的生命周期，通常會創(chuàng)建一個獨立不可見的窗口）CreateWindowEx。

以下2點需要注意：

托盤控件的ContextMenu菜單MenuItem在使用binding時無效，是因為DataContext沒有帶過去，需要重新賦值一次。托盤控件發(fā)送ShowBalloonTip消息通知時候需新建Shell_NotifyIcon。Nuget最新Install-PackageWPFDevelopers-preview

示例代碼

1）NotifyIcon.cs代碼如下：

using

System;

using

System.IO;

using

System.Runtime.InteropServices;

using

System.Threading;

using

System.Windows;

using

System.Windows.Controls;

using

System.Windows.Controls.Primitives;

using

System.Windows.Data;

using

System.Windows.Input;

using

System.Windows.Media;

using

System.Windows.Media.Imaging;

using

WPFDevelopers.Controls.Runtimes;

using

WPFDevelopers.Controls.Runtimes.Interop;

using

WPFDevelopers.Controls.Runtimes.Shell32;

using

WPFDevelopers.Controls.Runtimes.User32;

namespace

WPFDevelopers.Controls

public

class

NotifyIcon

:

FrameworkElement,

IDisposable

{

private

static

NotifyIcon

NotifyIconCache;

public

static

readonly

DependencyProperty

ContextContentProperty

=

DependencyProperty.Register(

"ContextContent",

typeof(object),

typeof(NotifyIcon),

new

PropertyMetadata(default));

public

static

readonly

DependencyProperty

IconProperty

=

DependencyProperty.Register("Icon",

typeof(ImageSource),

typeof(NotifyIcon),

new

PropertyMetadata(default,

OnIconPropertyChanged));

public

static

readonly

DependencyProperty

TitleProperty

=

DependencyProperty.Register("Title",

typeof(string),

typeof(NotifyIcon),

new

PropertyMetadata(default,

OnTitlePropertyChanged));

public

static

readonly

RoutedEvent

ClickEvent

=

EventManager.RegisterRoutedEvent("Click",

RoutingStrategy.Bubble,

typeof(RoutedEventHandler),

typeof(NotifyIcon));

public

static

readonly

RoutedEvent

MouseDoubleClickEvent

=

EventManager.RegisterRoutedEvent("MouseDoubleClick",

RoutingStrategy.Bubble,

typeof(RoutedEventHandler),

typeof(NotifyIcon));

private

static

bool

s_Loaded

=

false;

private

static

NotifyIcon

s_NotifyIcon;

//這是窗口名稱

private

readonly

string

_TrayWndClassName;

//這個是窗口消息名稱

private

readonly

string

_TrayWndMessage;

//這個是窗口消息回調（窗口消息都需要在此捕獲）

private

readonly

WndProc

_TrayWndProc;

private

Popup

_contextContent;

private

bool

_doubleClick;

//圖標句柄

private

IntPtr

_hIcon

=

IntPtr.Zero;

private

ImageSource

_icon;

private

IntPtr

_iconHandle;

private

int

_IsShowIn;

//托盤對象

private

NOTIFYICONDATA

_NOTIFYICONDATA;

//這個是傳遞給托盤的鼠標消息id

private

int

_TrayMouseMessage;

//窗口句柄

private

IntPtr

_TrayWindowHandle

=

IntPtr.Zero;

//通過注冊窗口消息可以獲取唯一標識Id

private

int

_WmTrayWindowMessage;

private

bool

disposedValue;

public

NotifyIcon()

{

_TrayWndClassName

=

$"WPFDevelopers_{Guid.NewGuid()}";

_TrayWndProc

=

WndProc_CallBack;

_TrayWndMessage

=

"TrayWndMessageName";

_TrayMouseMessage

=

(int)WM.USER

+

1024;

Start();

if

(Application.Current

!=

null)

{

//Application.Current.MainWindow.Closed

+=

(s,

e)

=

Dispose();

Application.Current.Exit

+=

(s,

e)

=

Dispose();

}

NotifyIconCache

=

this;

}

static

NotifyIcon()

{

DataContextProperty.OverrideMetadata(typeof(NotifyIcon),

new

FrameworkPropertyMetadata(DataContextPropertyChanged));

ContextMenuProperty.OverrideMetadata(typeof(NotifyIcon),

new

FrameworkPropertyMetadata(ContextMenuPropertyChanged));

}

private

static

void

DataContextPropertyChanged(DependencyObject

d,

DependencyPropertyChangedEventArgs

e)

=

((NotifyIcon)d).OnDataContextPropertyChanged(e);

private

void

OnDataContextPropertyChanged(DependencyPropertyChangedEventArgs

e)

{

UpdateDataContext(_contextContent,

e.OldValue,

e.NewValue);

UpdateDataContext(ContextMenu,

e.OldValue,

e.NewValue);

}

private

void

UpdateDataContext(FrameworkElement

target,

object

oldValue,

object

newValue)

{

if

(target

==

null

||

BindingOperations.GetBindingExpression(target,

DataContextProperty)

!=

null)

return;

if

(ReferenceEquals(this,

target.DataContext)

||

Equals(oldValue,

target.DataContext))

{

target.DataContext

=

newValue

this;

}

}

private

static

void

ContextMenuPropertyChanged(DependencyObject

d,

DependencyPropertyChangedEventArgs

e)

{

var

ctl

=

(NotifyIcon)d;

ctl.OnContextMenuPropertyChanged(e);

}

private

void

OnContextMenuPropertyChanged(DependencyPropertyChangedEventArgs

e)

=

UpdateDataContext((ContextMenu)e.NewValue,

null,

DataContext);

public

object

ContextContent

{