<ComboBox IsTextSearchEnabled="True" VerticalContentAlignment="Bottom" HorizontalContentAlignment="Center" Loaded="ChooseUser_Loaded" Height="33" Margin="30,60,155,0" IsEditable="True" BorderThickness="0,0,0,1" TextBoxBase.TextChanged="ChooseUser_TextChanged" Text="{Binding UserName}" x:Name="ChooseUser" MouseDoubleClick="ChooseUser_MouseDoubleClick" SelectionChanged="ChooseUser_SelectionChanged" VerticalAlignment="Top" Background="{x:Null}" Width="391"> </ComboBox>如何更改combox中text的位置

你可以通过设置ComboBox的VerticalContentAlignment和HorizontalContentAlignment属性来更改文本的位置。例如，将VerticalContentAlignment设置为Center，将HorizontalContentAlignment设置为Left，文本就会垂直居中并水平靠左。示例代码如下：

<ComboBox 
    IsTextSearchEnabled="True" 
    VerticalContentAlignment="Center" 
    HorizontalContentAlignment="Left"
    Loaded="ChooseUser_Loaded" 
    Height="33" 
    Margin="30,60,155,0" 
    IsEditable="True" 
    BorderThickness="0,0,0,1" 
    TextBoxBase.TextChanged="ChooseUser_TextChanged" 
    Text="{Binding UserName}" 
    x:Name="ChooseUser" 
    MouseDoubleClick="ChooseUser_MouseDoubleClick" 
    SelectionChanged="ChooseUser_SelectionChanged" 
    VerticalAlignment="Top" 
    Background="{x:Null}" 
    Width="391">
</ComboBox>