控件模版ControlTemplate就是设置控件的外观，比如我们常见到的按钮是下面这样的，但是我们如何改变成圆形的呢?
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<Window x:Class="DeepXAML.MainWindow"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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xmlns:local="clr-namespace:DeepXAML" |
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xmlns:sys="clr-namespace:System;assembly=mscorlib"
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Title="MainWindow" Height="250" Width="450">
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<Window.Resources>
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<Style x:Key="roundButton" TargetType="Button">
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<Setter Property="Background">
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<Setter.Value>
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<LinearGradientBrush StartPoint="0.5,0" EndPoint="0.5,1">
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<LinearGradientBrush.GradientStops>
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<GradientStop Offset="0.0" Color="#fff" />
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<GradientStop Offset="1.0" Color="Red" />
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</LinearGradientBrush.GradientStops>
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</LinearGradientBrush>
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</Setter.Value>
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</Setter>
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<Setter Property="Template">
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<Setter.Value>
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<ControlTemplate TargetType="Button">
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<Grid>
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<Ellipse Fill="{TemplateBinding Background}"></Ellipse>
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<ContentPresenter Margin="5" HorizontalAlignment="Center" VerticalAlignment="Center" /> </Grid>
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</ControlTemplate>
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</Setter.Value>
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</Setter>
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</Style>
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</Window.Resources>
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<StackPanel x:Name="stackPanel">
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<Button Width="200" Height="120" Margin="20" Style="{StaticResource ResourceKey=roundButton}">OK</Button>
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</StackPanel>
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</Window>
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ItemsControl有个PanelTemplate可以控制ItemsControl的条目容器