以往WinForm編程中，實現不規則窗體是有一定難度的，更難的是不規則窗體的邊緣抗鋸齒及局部透明處理。而現在，WPF的出現使這個問題迎刃而解，使得我們可以輕松、靈活地美化用戶界面。
下面就讓我們來看看如何實現一個不規則窗體：
首先我們需要借助Microsoft Expression Design 2來進行圖形設計。(這里使用Photoshop等傳統軟件也可以，但是只能利用PNG格式來實現透明，其缺點就是不支持無損縮放，且不支持動態修改。)
打開Microsoft Expression Design 2中文版，點擊菜單“文件 > 新建”，依照下圖進行設置，這里將文檔尺寸單位設為“像素”，便于與應用程序的布局單位相對應。
然后隨心所欲的畫吧，想畫成什么樣都行，但注意Microsoft Expression Design 2中繪制的圖形并非全部都是矢量的，比如紋理填充、一些特殊筆刷以及濾鏡效果(輸出時有“將實時效果轉換為XAML效果”的選項，但是點了無用，不知道是不是BUG)都會以位圖形式輸出。
這是我畫出來的圖形：
這里要注意的是：最好將所有元素都放在一個圖層里，因為我們后面導出資源字典的時候需要依據圖層來分組，我們畫好之后要給圖層重命名，在這里我給它命名為“back”，這個名稱將在后面代碼中引用資源時使用。
接下來點擊菜單“文件 > 導出...”，將格式設為“XAML WPF 資源字典”，分組依據設為“層”，實時效果設為“轉換為XAML效果”(貌似無用的設置)。然后按“瀏覽...”按鈕選擇輸出路徑，然后按“全部導出”按鈕完成導出。
然后就可以保存文件，關閉Microsoft Expression Design 2了。
打開Microsoft Visual Studio 2008，點擊菜單“文件 > 新建 > 項目...”，選擇“WPF 應用程序”，名稱設為“不規則窗體”。
點擊菜單“項目 > 添加現有項...”，瀏覽并選擇此前導出的資源字典文件(選的時候注意把右邊的文件類型過濾改一下，默認是C#文件類型)。如下圖所示，這就是導入的資源字典文件。
引入的資源字典內容如下，我們不需要搞明白這些對圖形的描述語法，只要了解其中的“x:Key="back"”對應的是我們之前設計時的圖層名稱，我們在程序中引用此資源時要使用這個名稱。
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208.284 423.238,201.522 422.432,195.915C 421.336,191 418.81,
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183.961C 395.181,185.825 389.428,189.321 384.689,194.449C 379.949,
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265.883 342.488,270.431C 343.245,273.814 344.868,275.87 347.356,
276.6C 349.845,277.329 ;352.537,277.307 355.433,276.531C 365.147,
274.374 371.348,271.429 374.035,267.695C 376.721,263.961 377.512,
257.809 376.408,249.238C 375.659,243.56 375.479,236.538 375.867,
228.173C 376.254,219.808 379.136,214.712 384.512,212.885C 385.98,
212.646 387.156,212.932 388.041,213.743C 388.927,214.554 389.503,
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<GeometryDrawing.Pen>
<Pen Thickness="1.5" LineJoin="Round" Brush="#FF7D2500"/>
</GeometryDrawing.Pen>
<GeometryDrawing.Brush>
<RadialGradientBrush RadiusX="0.592402" RadiusY=
"0.66297" Center="0.449238,0.438522"
GradientOrigin="0.449238,0.438522">
<RadialGradientBrush.GradientStops>
<GradientStop Color="#FFFFFFFF" Offset="0"/>
<GradientStop Color="#FFD5D5D5" Offset="1"/>
</RadialGradientBrush.GradientStops>
<RadialGradientBrush.RelativeTransform>
<TransformGroup/>
</RadialGradientBrush.RelativeTransform>
</RadialGradientBrush>
</GeometryDrawing.Brush>
</GeometryDrawing>
<GeometryDrawing Geometry="F1 M 483.77,222.366C 488.381,
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230.221 479.158,226.206 483.77,222.366 Z M 511.055,144.366C 510,
148.842 507.063,161.261 502.245,181.621C 497.427,201.98 493.841,
212.379 491.487,212.817C 489.133,213.254 488.412,203.639 489.322,
183.972C ;490.233,164.305 490.945,152.085 491.456,147.314C 491.968,
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<GeometryDrawing.Pen>
<Pen Thickness="1.5" LineJoin="Round" Brush="#FF7D2500"/>
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<GeometryDrawing.Brush>
<RadialGradientBrush RadiusX="1.89231" RadiusY=
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GradientOrigin="0.451968,0.411473">
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<GradientStop Color="#FFFFFFFF" Offset="0"/>
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</ResourceDictionary>
現在我們要把這個資源字典引入程序集，打開“App.xaml”文件，添加下圖中紅色框內的代碼。
<Application x:Class="不規則窗體.App"
xmlns="//schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="//schemas.microsoft.com/winfx/2006/xaml"
StartupUri="Window1.xaml">
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="cnblogs-SkyD.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
</Application>
然后打開“Window1.xaml”文件的設計視圖，點擊窗體邊緣以選中窗體，依照下圖所示，在屬性面板中更改AllowsTransparency及WindowStyle屬性。
AllowsTransparency 指示窗體是否支持透明。
WindowStyle指示窗體邊框樣式，設為 None 為無邊框。
切換到XAML代碼視圖，依照下圖所示，為 Window 元素添加Background和 MouseDown屬性定義。
Background 屬性指示窗體的背景，這里引用資源中的"back"，就是我們之前畫好的圖形啦。
MouseDown 是鼠標按下時產生的事件，我們要為之定義一個事件處理函數以實現窗體拖動功能。
<Window x:Class="不規則窗體.Window1"
xmlns="//schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="//schemas.microsoft.com/winfx/2006/xaml"
Title="Window1"
Height="450"
Width="450"
AllowsTransparency="True"
WindowStyle="None"
Background="{StaticResource back}"
MouseDown="Window_MouseDown">
<Grid>
</Grid>
</Window>
在上圖的“Window_MouseDown”字符上單擊右鍵，在彈出菜單中選擇“定位到事件處理程序”，即會轉到“Window1.xaml.cs”代碼視圖，依照下圖輸入代碼。
private void Window_MouseDown(object sender, MouseButtonEventArgs e)
{
if(e.ChangedButton==MouseButton.Left)this.DragMove();
}
至此就完成了不規則窗體的創制了。
編譯運行看看：
嗯嗯，效果很酷的說，你說什么?沒有關閉按鈕?這么好看的界面你舍得關嗎?
好吧，要實現關閉按鈕也很簡單啦，自己搞個按鈕在上面，在 Click 事件中執行 this.Close(); 就OK啦，我是懶得搞了哈。
此效果在任何裝有.Net框架3.0的機器上都可以運作，不用再羨慕Adobe AIR的外觀了，WPF可以做得更好!
再來張Vista切換窗口時的圖：
標簽：
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