<Window x:Class="SerialLabelDemo.Test.Window10"

        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:SerialLabelDemo.Test"

        mc:Ignorable="d" AllowDrop="True"

            Title="MainWindow" Height="350" Width="525">

    <Grid>

        <Grid.RowDefinitions>

            <RowDefinition Height="35"/>

            <RowDefinition Height="*"/>

        </Grid.RowDefinitions>

        <StackPanel Grid.Row="0" Orientation="Horizontal" Background="#CC0088FF">

            <Button

          Name="btClear" Click="ClickClear" Content="Clear" Margin="5"

        />

            <Border BorderBrush="Black" BorderThickness="1" MaxHeight="25">

                <CheckBox

            Name="cbWrap"

            Content="Wrap Content"

            IsChecked="False"

            Margin="5" Padding="5,0,0,0"

            VerticalAlignment="Center" VerticalContentAlignment="Center"

            Click="ClickWrap"

          />

            </Border>

            <Label

          Name="lblInstructions"

          HorizontalContentAlignment="Center" VerticalContentAlignment="Center"

          FontWeight="Bold"

          Content="     Drop a single file below to display its contents.     "

        />

        </StackPanel>

        <TextBox

        Name="tbDisplayFileContents"

        Grid.Row="1"

        AcceptsReturn="True" AcceptsTab="True"

        AllowDrop="True"

        BorderThickness="1" BorderBrush="Black"

        HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto"

        PreviewDragOver="EhDragOver" PreviewDrop="EhDrop"/>

        <TextBlock Text="管理员运行是不可以进行拖拽的"/>

    </Grid>

</Window>

    public partial class Window10 : Window

    {

        public Window10()

        {

            InitializeComponent();

            if ((bool)cbWrap.IsChecked)

                tbDisplayFileContents.TextWrapping = TextWrapping.Wrap;

            else

                tbDisplayFileContents.TextWrapping = TextWrapping.NoWrap;

        }

        private void ClickClear(object sender, RoutedEventArgs args)

        {

            tbDisplayFileContents.Clear();

        }

        private void ClickWrap(object sender, RoutedEventArgs args)

        {

            if ((bool)cbWrap.IsChecked)

                tbDisplayFileContents.TextWrapping = TextWrapping.Wrap;

            else

                tbDisplayFileContents.TextWrapping = TextWrapping.NoWrap;

        }

        private void EhDragOver(object sender, DragEventArgs args)

        {

            // As an arbitrary design decision, we only want to deal with a single file.

            args.Effects = IsSingleFile(args) != null ? DragDropEffects.Copy : DragDropEffects.None;

            // Mark the event as handled, so TextBox's native DragOver handler is not called.

            args.Handled = true;

        }

        private void EhDrop(object sender, DragEventArgs args)

        {

            // Mark the event as handled, so TextBox's native Drop handler is not called.

            args.Handled = true;

            var fileName = IsSingleFile(args);

            if (fileName == null) return;

            var fileToLoad = new StreamReader(fileName);

            tbDisplayFileContents.Text = fileToLoad.ReadToEnd();

            fileToLoad.Close();

            // Set the window title to the loaded file.

            Title = "File Loaded: " + fileName;

        }

        // If the data object in args is a single file, this method will return the filename.

        // Otherwise, it returns null.

        private string IsSingleFile(DragEventArgs args)

        {

            // Check for files in the hovering data object.

            if (args.Data.GetDataPresent(DataFormats.FileDrop, true))

            {

                var fileNames = args.Data.GetData(DataFormats.FileDrop, true) as string[];

                // Check fo a single file or folder.

                if (fileNames.Length == 1)

                {

                    // Check for a file (a directory will return false).

                    if (File.Exists(fileNames[0]))

                    {

                        // At this point we know there is a single file.

                        return fileNames[0];

                    }

                }

            }

            return null;

        }

    }