将 Template 应用给应用目标有两种方法，一种是给每个控件设定Template/ContentTemplate/ItemsTemplate/CellTemplate，不想设定的就不设置。另外一种就是 整体应用，把Template设置到 某种指定的控件或者数据上
把ControlTemplate应用到所有目标上，需要借助 Style，但是不能设定 x:key
<Window.Resources>
<Style TargetType="{x:Type TextBox}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate>
<Border x:Name="border" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}"
Background="{TemplateBinding Background}"
SnapsToDevicePixels="True" CornerRadius="8">
<ScrollViewer x:Name="PART_ContentHost" Focusable="false" HorizontalScrollBarVisibility="Hidden" VerticalScrollBarVisibility="Hidden"/>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
<Setter Property="Margin" Value="5"></Setter>
<Setter Property="BorderBrush" Value="Red"></Setter>
<Setter Property="Height" Value="30"></Setter>
</Style>
</Window.Resources>
<StackPanel>
<TextBox></TextBox>
<TextBox></TextBox>
<TextBox Style="{x:Null}"></TextBox>
</StackPanel>
把DataTemplate 应用到 某个数据类型上 ，通过设定 DataType来实现。同样，也不能设定 x:key
<Window x:Class="WpfDemo.StyleDemo1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:WpfDemo"
xmlns:sys="clr-namespace:System.Collections;assembly=mscorlib"
mc:Ignorable="d"
Title="StyleDemo1" Height="300" Width="300">
<Window.Resources>
<DataTemplate DataType="{x:Type local:Employee}">
<Grid>
<StackPanel Orientation="Horizontal">
<Grid>
<Rectangle Stroke="Yellow" Fill="Orange" Width="{Binding age}"></Rectangle>
<TextBlock Text="{Binding name}"></TextBlock>
</Grid>
<TextBlock Text="{Binding age}"></TextBlock>
</StackPanel>
</Grid>
</DataTemplate>
<sys:ArrayList x:Key="ds">
<local:Employee name="張三" age="20"></local:Employee>
<local:Employee name="李四" age="30"></local:Employee>
<local:Employee name="王五" age="40"></local:Employee>
</sys:ArrayList>
</Window.Resources>
<StackPanel>
<ListBox ItemsSource="{StaticResource ds}" Height="73.662"></ListBox>
<ComboBox ItemsSource="{StaticResource ds}" Height="18.903"></ComboBox>
</StackPanel>
</Window>