动态分配图像到WPF中的文本框模板

您可以将{Binding}用作<Image.Source>属性。这是一个作为LinqPad查询的示例（免费获取LinqPad）：

void Main()
{
    // Need to parse XAML since LinqPad doesn't have an integrated XAML build
    var xaml = @"
    <Grid xmlns=""http://schemas.microsoft.com/winfx/2006/xaml/presentation"" xmlns:x=""http://schemas.microsoft.com/winfx/2006/xaml"">
    <Grid.Resources>
    <Style TargetType=""Control"" x:Key=""imageTextBox"">
        <Setter Property=""Margin"" Value=""0,0,0,8""/>
        <Setter Property=""Template"">
            <Setter.Value>
                <ControlTemplate TargetType=""Control"">
                    <Border x:Name=""bg"" BorderThickness=""1"" CornerRadius=""3"" BorderBrush=""Gray"">
                        <Grid>
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width=""30""/>
                                <ColumnDefinition Width=""*""/>
                            </Grid.ColumnDefinitions>
                            <TextBox Style=""{DynamicResource BasicTextBox}"" Grid.Column=""1""
                                     Foreground=""{TemplateBinding Foreground}""
                                     Background=""{TemplateBinding Background}""
                                     FontFamily=""{TemplateBinding FontFamily}""
                                     FontSize=""{TemplateBinding FontSize}""
                                     FontWeight=""{TemplateBinding FontWeight}""
                                     MinWidth=""340"" Margin=""1"" />
                            <Image Source=""{Binding Image}"" Width=""20""/>
                        </Grid>
                    </Border>

                    <ControlTemplate.Triggers>
                        <Trigger Property=""IsMouseOver"" Value=""True"">
                            <Setter Property=""BorderBrush"" TargetName=""bg"" Value=""Black""/>
                        </Trigger>
                        <Trigger Property=""IsFocused"" Value=""True"">
                            <Setter Property=""BorderBrush"" TargetName=""bg"" Value=""Black""/>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    </Grid.Resources>
    <TextBox Style=""{StaticResource imageTextBox}"" />
    </Grid>
    ";

    // Get some images... these could be in your resources
    var png = PngBitmapDecoder.Create(new Uri("https://upload.wikimedia.org/wikipedia/commons/9/97/Esperanto_star.png"), BitmapCreateOptions.None, BitmapCacheOption.Default);
    var vm = new ViewModel { Image = png.Frames[0] };
    var o = (FrameworkElement)XamlReader.Parse(xaml);
    // Set the image source - in this case, a view model
    o.DataContext = vm;
    // Let LinqPad display it
    PanelManager.DisplayWpfElement(o);

    // This code is for the example only, to change the image after 2 seconds.
    var dispatcher = o.Dispatcher;
    Task.Run(async () =>
    {
        await Task.Delay(2000);
        await dispatcher.BeginInvoke((Action)(() =>
        {
            png = PngBitmapDecoder.Create(new Uri("https://upload.wikimedia.org/wikipedia/commons/f/f6/Lol_question_mark.png"), BitmapCreateOptions.None, BitmapCacheOption.Default);
            vm.Image = png.Frames[0];
        }));
    });
}

// Define other methods and classes here
public class ViewModel : INotifyPropertyChanged
{
    private ImageSource _image;
    public event PropertyChangedEventHandler PropertyChanged;

    public ImageSource Image
    {
        get
        {
            return _image;
        }
        set
        {
            if (_image == value)
            {
                return;
            }

            _image = value;
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(Image)));
        }
    }
}

本示例使用一个简单的视图模型作为Binding源，但是它可以是任何源。还有一些代码会在Image2秒钟的延迟后更改该值，以向您显示它确实在更新。在您的代码中，您将忽略它并使用您想要更新它的方式。

首先，它显示为：

然后在更新后：