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<Window x:Class="FS_Test.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="294" Width="300">


    <Grid x:Name="LayoutRoot" Background="White">

        <Grid.RowDefinitions>

            <RowDefinition Height="50"></RowDefinition>

            <RowDefinition></RowDefinition>

        </Grid.RowDefinitions>

        <Border Grid.Row="1" x:Name="photoBorder" 
            BorderBrush="Blue" BorderThickness="4">
            <Canvas x:Name="photoPanel" Grid.Row="1" 
                 Background="Gray" AllowDrop="True"
                 Drop="photoPanel_Drop"
                 DragEnter="photoPanel_DragEnter"
                 DragLeave="photoPanel_DragLeave">
                <!--Image Source="file:///d:/Chrysanthemum.jpg" VerticalAlignment="Center"></Image>-->
            </Canvas>
        </Border>

    </Grid>
</Window>                    

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.IO;
using System.Windows.Media.Imaging;

namespace FS_Test
{
    /// <summary>
    /// Interaktionslogik für Window1.xaml
    /// </summary>
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {

        }


        private void photoPanel_Drop(object sender, DragEventArgs e)
        {

            photoBorder.BorderBrush = new SolidColorBrush(Colors.Blue);

            IDataObject data = e.Data;

            try
            {
                Array test = (Array)data.GetData(DataFormats.FileDrop);

                string teststring = test.GetValue(0).ToString();
                
                FileInfo f = new FileInfo(teststring);


                    if (IsImage(f))
                    {

                        Stream s = f.OpenRead();

                        BitmapImage bitmap = new BitmapImage();

                        bitmap.StreamSource = (s);

                        Image img = new Image();

                        img.Source = bitmap;

                        img.Width = 100;

                        img.Height = 80;

                        Point p = e.GetPosition(photoPanel);

//                        img.Margin = new Thickness(p.X, p.Y, 0, 0);
                        img.VerticalAlignment = VerticalAlignment.Center;
                        photoPanel.Children.Add(img);

                    }

                
            }
            catch (Exception ex)
            {
            }

        }
        private void photoPanel_DragEnter(object sender, DragEventArgs e)
        {

           photoBorder.BorderBrush = new SolidColorBrush(Colors.Red);

        }

        private void photoPanel_DragLeave(object sender, DragEventArgs e)
        {

            photoBorder.BorderBrush = new SolidColorBrush(Colors.Blue);

        }

        private bool IsImage(FileInfo file)
        {
            string ext = file.Extension.ToLower();

            string[] extensions = 
           {
            ".bmp",
            ".jpg",
            ".jpeg",
            ".gif",
            ".png"
           };

            return extensions.Contains(ext);
        }
    }
}                    

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BitmapImage bitmap = new BitmapImage(new Uri(file.FullName, UriKind.Absolute));
Image bitmapView = new Image() { Source = bitmap };