wpf-creation of non-rectangular windows

First, the window's allowstransparency is set to True

Second, the window's background is set to Transparent

Third, the window's windowstyle is set to None

The grid in the window is set to the desired shape using clip or border

code example (using clip to implement a fillet window)

1 <Windowx:class= "Test"2 xmlns= "Http://schemas.microsoft.com/winfx/2006/xaml/presentation"3 xmlns:x= "Http://schemas.microsoft.com/winfx/2006/xaml"4 xmlns:d= "http://schemas.microsoft.com/expression/blend/2008"5 XMLNS:MC= "http://schemas.openxmlformats.org/markup-compatibility/2006"6 xmlns:local= "Clr-namespace:caipiaoui"7 mc:ignorable= "D"8 Title= "Test"Height= "$"Width= "$"WindowStyle= "None"allowstransparency= "True" 9 Background= "Transparent"windowstartuplocation= "Centerscreen">Ten     <GridBackground= "Blue"> One         <Grid.clip> A             <RectangleGeometryRadiusX= " the"RadiusY= " the"Rect= "0,0,500,500"></RectangleGeometry> -         </Grid.clip> -     </Grid> the </Window>

code example (using border to implement a fillet window)

1 <Windowx:class= "Test"2 xmlns= "Http://schemas.microsoft.com/winfx/2006/xaml/presentation"3 xmlns:x= "Http://schemas.microsoft.com/winfx/2006/xaml"4 xmlns:d= "http://schemas.microsoft.com/expression/blend/2008"5 XMLNS:MC= "http://schemas.openxmlformats.org/markup-compatibility/2006"6 xmlns:local= "Clr-namespace:caipiaoui"7 mc:ignorable= "D"8 Title= "Test"Height= "$"Width= "$"WindowStyle= "None"allowstransparency= "True" 9 Background= "Transparent"windowstartuplocation= "Centerscreen">Ten     <Grid> One         <Borderborderthickness= " the"Cornerradius= " the"Background= "Blue"></Border> A     </Grid> - </Window>

One particular note here is the location of the window background color setting:
In the clip implementation mode, the window background color is set on the grid;

In the border implementation mode, the window background color is set on the border.

wpf-creation of non-rectangular windows