如何为绑定到WPF C#中的列表的字符串的大写字符提供不同的字体大小？

  // Main code
                  List<AudioDevice> devices = new List<AudioDevice>();
              HRESULT hr = HRESULT.E_FAIL;
              Guid CLSID_MMDeviceEnumerator = new Guid("{BCDE0395-E52F-467C-8E3D-C4579291692E}");
              Type MMDeviceEnumeratorType = Type.GetTypeFromCLSID(CLSID_MMDeviceEnumerator, true);
              object MMDeviceEnumerator = Activator.CreateInstance(MMDeviceEnumeratorType);
              IMMDeviceEnumerator pMMDeviceEnumerator = (IMMDeviceEnumerator)MMDeviceEnumerator;
              if (pMMDeviceEnumerator != null)
                  string sIdDefaultRender = null;
                  string sIdDefaultCapture = null;
                  IMMDevice pDefaultDevice = null;
                  hr = pMMDeviceEnumerator.GetDefaultAudioEndpoint(EDataFlow.eRender, ERole.eConsole, out pDefaultDevice);
                  if (hr == HRESULT.S_OK)
                      IntPtr hGlobal = Marshal.AllocHGlobal(260);
                      hr = pDefaultDevice.GetId(out hGlobal);
                      sIdDefaultRender = Marshal.PtrToStringUni(hGlobal);
                      Marshal.FreeHGlobal(hGlobal);
                      Marshal.ReleaseComObject(pDefaultDevice);
                  hr = pMMDeviceEnumerator.GetDefaultAudioEndpoint(EDataFlow.eCapture, ERole.eConsole, out pDefaultDevice);
                  if (hr == HRESULT.S_OK)
                      IntPtr hGlobal = Marshal.AllocHGlobal(260);
                      hr = pDefaultDevice.GetId(out hGlobal);
                      sIdDefaultCapture = Marshal.PtrToStringUni(hGlobal);
                      Marshal.FreeHGlobal(hGlobal);
                      Marshal.ReleaseComObject(pDefaultDevice);
                  IMMDeviceCollection pDeviceCollection = null;
                  hr = pMMDeviceEnumerator.EnumAudioEndpoints(EDataFlow.eAll, DEVICE_STATE_ACTIVE | DEVICE_STATE_UNPLUGGED, out pDeviceCollection);
                  if (hr == HRESULT.S_OK)
                      uint nDevices = 0;
                      hr = pDeviceCollection.GetCount(out nDevices);
                      devices.Add(new AudioDevice() { Name = "System default", Direction = "Playback", Id = sIdDefaultRender, Default = true });
                      for (uint i = 0; i < nDevices; i++)
                          IMMDevice pDevice = null;
                          hr = pDeviceCollection.Item(i, out pDevice);
                          if (hr == HRESULT.S_OK)
                              IPropertyStore pPropertyStore = null;
                              hr = pDevice.OpenPropertyStore(STGM_READ, out pPropertyStore);
                              if (hr == HRESULT.S_OK)
                                  string sFriendlyName = null;
                                  string sDesc = null;
                                  PROPVARIANT pv = new PROPVARIANT();
                                  hr = pPropertyStore.GetValue(ref PKEY_Device_FriendlyName, out pv);
                                  if (hr == HRESULT.S_OK)
                                      sFriendlyName = Marshal.PtrToStringUni(pv.pwszVal);
                                  hr = pPropertyStore.GetValue(ref PKEY_Device_DeviceDesc, out pv);
                                  if (hr == HRESULT.S_OK)
                                      sDesc = Marshal.PtrToStringUni(pv.pwszVal);
                                  IntPtr hGlobal = Marshal.AllocHGlobal(260);
                                  hr = pDevice.GetId(out hGlobal);
                                  string sId = Marshal.PtrToStringUni(hGlobal);
                                  Marshal.FreeHGlobal(hGlobal);
                                  IMMEndpoint pEndpoint = null;
                                  pEndpoint = (IMMEndpoint)pDevice;
                                  EDataFlow eDirection = EDataFlow.eAll;
                                  hr = pEndpoint.GetDataFlow(out eDirection);
                                  //System.Diagnostics.Trace.WriteLine("\tDirection : " + eDirection.ToString());
                                  string sDirection = "";
                                  if (eDirection == EDataFlow.eRender)
                                      sDirection = "Playback";
                                  else if (eDirection == EDataFlow.eCapture)
                                      sDirection = "Recording";
                                  int nState = 0;
                                  hr = pDevice.GetState(out nState);
                                  if ((nState == DEVICE_STATE_ACTIVE))
                                      devices.Add(new AudioDevice() { Name = sFriendlyName, Direction = sDirection, Id = sId, Default = (sId == sIdDefaultRender || (sId == sIdDefaultCapture)) });
                                      //sFriendlyName += (sId == sIdDefaultRender || sId == sIdDefaultCapture) ? " (System default)" : "";
                                      //devices.Add(new AudioDevice() { Name = sFriendlyName, Direction = sDirection, Default = (sId == sIdDefaultRender || (sId == sIdDefaultCapture)) });
                                      ////devices.Add(new AudioDevice() { Name = sFriendlyName, Direction = sDirection, Default = (sId == sIdDefaultRender || (sId == sIdDefaultCapture)) });
                                  Marshal.ReleaseComObject(pPropertyStore);
                              Marshal.ReleaseComObject(pDevice);
                      devices.Insert(devices.Count - 0, new AudioDevice() { Name = "Selected application ...", Direction = "Recording", Id = "Idlast", Default = false });
                  Marshal.ReleaseComObject(pDeviceCollection);
                  ListCollectionView lcv = new ListCollectionView(devices);
                  lcv.GroupDescriptions.Add(new PropertyGroupDescription("Direction"));
                  this.cmb1.ItemsSource = lcv;
          public class AudioDevice
                      public string Name { get; set; }
                      public string Direction { get; set; }
                      public string Id { get; set; }
                      public bool Default { get; set; }
      public override string ToString()
                     return Name;
              }

<Style x:Key="{x:Type ComboBoxItem}" TargetType="{x:Type ComboBoxItem}">
             <Setter Property="SnapsToDevicePixels" Value="True"/>
             <Setter Property="UseLayoutRounding" Value="True"/>
             <Setter Property="RenderOptions.BitmapScalingMode" Value="NearestNeighbor"/>
             <Setter Property="RenderOptions.ClearTypeHint" Value="Enabled"/>
             <Setter Property="FontFamily" Value="Segoe UI"/>
             <Setter Property="FontSize" Value="9"/>
             <Setter Property="TextOptions.TextFormattingMode" Value="Display"/>
             <Setter Property="Foreground" Value="#939393"/>
             <Setter Property="Template">
                 <Setter.Value>
                     <ControlTemplate TargetType="{x:Type ComboBoxItem}">
                             <Border x:Name="gd" Background="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ComboBox}},Path=Background}" BorderThickness="0" SnapsToDevicePixels="True" UseLayoutRounding="True" RenderOptions.BitmapScalingMode="NearestNeighbor" RenderOptions.ClearTypeHint="Enabled">
                                 <ContentPresenter
                                 Name="ContentSite" Margin="25, 3, 0, 11" VerticalAlignment="Center">
                                     <ContentPresenter.ContentTemplate>
                                         <DataTemplate>
                                             <TextBlock SnapsToDevicePixels="True" UseLayoutRounding="True" RenderOptions.BitmapScalingMode="HighQuality" RenderOptions.EdgeMode="Aliased">                                           
                                                 <Run Text="{Binding Name}"/>
                                             </TextBlock>
                                         </DataTemplate>
                                     </ContentPresenter.ContentTemplate>
                                 </ContentPresenter>
                             </Border>
                             <Rectangle x:Name="Border1" Width="12.2" Height="11" Margin="-220,-7,0,0"          RenderOptions.BitmapScalingMode="HighQuality" RenderOptions.ClearTypeHint="Auto" SnapsToDevicePixels="True" RenderOptions.EdgeMode="Unspecified">
                                 <Rectangle.Fill>
                                     <DrawingBrush>
                                         <DrawingBrush.Drawing>
                                             <DrawingGroup x:Name="DrawingLayer">
                                                 <DrawingGroup.ClipGeometry>
                                                     <RectangleGeometry Rect="0,0,512,512" />
                                                 </DrawingGroup.ClipGeometry>
                                                 <DrawingGroup Transform="0.1,0,0,-0.1,0,512">
                                                     <GeometryDrawing Brush="#d0021b">
                                                         <GeometryDrawing.Geometry>
                                                             <PathGeometry FillRule="Nonzero" Figures="M4670,3950L2560,1350 1560,2570 830,2190 2590,170 5140,3260 4670,3950z" />
                                                         </GeometryDrawing.Geometry>
                                                         <GeometryDrawing.Pen>
                                                             <Pen Brush="#d0021b" Thickness="0" StartLineCap="Flat" EndLineCap="Flat" LineJoin="Miter" />
                                                         </GeometryDrawing.Pen>
                                                     </GeometryDrawing>
                                                 </DrawingGroup>
                                             </DrawingGroup>
                                         </DrawingBrush.Drawing>
                                     </DrawingBrush>
                                 </Rectangle.Fill>
                             </Rectangle>
                         </Grid>
                         <ControlTemplate.Triggers>
                             <Trigger Property="ComboBoxItem.IsMouseOver" Value="True">
                                 <Setter TargetName="gd" Property="Background" Value="#3c3c3c"></Setter>
                                 <Setter TargetName="gd" Property="TextElement.Foreground" Value="#ffffff"></Setter>
                                 <Setter TargetName="gd" Property="SnapsToDevicePixels" Value="True"/>
                                 <Setter TargetName="gd" Property="UseLayoutRounding" Value="True"/>
                                 <Setter TargetName="gd" Property="RenderOptions.BitmapScalingMode" Value="NearestNeighbor"/>
                                 <Setter TargetName="gd" Property="RenderOptions.ClearTypeHint" Value="Enabled"/>
                                 <Setter TargetName="Border1" Property="Visibility" Value="Collapsed"/>
                             </Trigger>
                             <Trigger Property="ComboBoxItem.IsMouseOver" Value="False">
                                 <Setter TargetName="Border1" Property="Visibility" Value="Hidden"/>
                             </Trigger>
                             <Trigger Property="ComboBoxItem.IsSelected" Value="True">
                                 <Setter TargetName="Border1" Property="Visibility" Value="Visible"/>
                             </Trigger>
                         </ControlTemplate.Triggers>
                     </ControlTemplate>
                 </Setter.Value>
             </Setter>
         </Style>

                                                   <DataTemplate>
                                                      <TextBlock SnapsToDevicePixels="True" UseLayoutRounding="True" RenderOptions.BitmapScalingMode="HighQuality" RenderOptions.EdgeMode="Aliased">
                                                          <Run x:Name="first" FontSize="18" Text="{Binding Name,Converter={StaticResource UppercaseConverter }}" />
                                                          <Run x:Name="rest" FontSize="10" Text="{Binding Name, Converter={StaticResource LowercaseConverter}}" />
                                                      </TextBlock>
                                                  </DataTemplate>

using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
namespace WpfApp1;
public class CustomTextBlock : TextBlock
    public new string Text
        get => (string)GetValue(TextProperty);
        set => SetValue(TextProperty, value);
    // Using a DependencyProperty as the backing store for Text.  This enables animation, styling, binding, etc...
    public static new readonly DependencyProperty TextProperty =
        DependencyProperty.Register("Text", typeof(string), typeof(CustomTextBlock), new PropertyMetadata(null, (d, ea) =>
            if (d is TextBlock textBlock)
                textBlock.Inlines.Clear();
                if (ea.NewValue is string value)
                    foreach (char c in value)
                        textBlock.Inlines.Add(new Run { FontSize = GetFontSize(c), Text = c.ToString() });
    private static double GetFontSize(char c)
        // You can add your other logic here
        /*if (c == '#')
            return 5;
        if (char.IsNumber(c))
            return 22;
        if (char.IsUpper(c))
            return 18;
        return 10;
}

<Window x:Class="WpfApp1.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:local="clr-namespace:WpfApp1"
    xmlns:sys="clr-namespace:System;assembly=mscorlib"
    mc:Ignorable="d"
    Title="MainWindow" Height="450" Width="800">
        <ComboBox VerticalAlignment="Top">
            <ComboBox.ItemsSource>
                <x:Array Type="sys:String">
                    <sys:String>Some Item #0</sys:String>
                    <sys:String>Some Item #1</sys:String>
                    <sys:String>Some Item #2</sys:String>
                </x:Array>
            </ComboBox.ItemsSource>
            <ComboBox.ItemTemplate>
                <DataTemplate>
                    <local:CustomTextBlock Text="{Binding}"/>
                </DataTemplate>

如何为绑定到WPF C#中的列表的字符串的大写字符提供不同的字体大小？

1 个回答