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,
187.567 414.856,185.617C 410.901,183.668 406.598,183.115 401.947,
183.961C 395.181,185.825 389.428,189.321 384.689,194.449C 379.949,
199.577 376.573,202.631 374.56,203.612C 372.502,203.388 370.959,
201.248 369.928,197.193C 368.898,193.138 366.181,191.216 361.778,
191.428C 357.74,192.299 353.059,194.169 347.734,197.037C 342.409,
199.906 338.148,202.731 334.951,205.515C 333.293,206.824 331.769,
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231.227 342.56,239.72 342.216,249.276C 341.873,258.831 341.963,
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,
215.687 389.77,217.144L 390.536,231.561 Z ">
<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,
142.542 494.322,138.591 498.517,135.46C 502.713,132.329 506.115,
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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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<RadialGradientBrush.RelativeTransform>
<TransformGroup/>
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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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