Able to drag the result file to external 3rd party program

DicomGrep/MainWindow.xaml

@@ -124,7 +124,7 @@
                     <RowDefinition Height="Auto"/>
                     <RowDefinition Height="*" MinHeight="30"/>
                 </Grid.RowDefinitions>
-                <DataGrid ItemsSource="{Binding MatchFileList}" AutoGenerateColumns="False" SelectedItem="{Binding SelectedMatchFile, Mode=Default}" SelectionMode="Single" IsReadOnly="True">
+                <DataGrid ItemsSource="{Binding MatchFileList}" AutoGenerateColumns="False" SelectedItem="{Binding SelectedMatchFile, Mode=Default}" SelectionMode="Single" IsReadOnly="True" MouseMove="DataGrid_MouseMove" MouseLeftButtonDown="DataGrid_MouseLeftButtonDown">
                     <DataGrid.Columns>
                         <DataGridTextColumn Header="File" Binding="{Binding Filename, Mode=OneWay}"/>
                         <DataGridTextColumn Header="Patient" Binding="{Binding PatientName, Mode=OneWay}"/>

DicomGrep/MainWindow.xaml.cs

@@ -1,4 +1,5 @@
 using DicomGrep.Views;
+using DicomGrepCore.Entities;
 using System;
 using System.Collections.Generic;
 using System.Linq;
@@ -21,6 +22,9 @@ namespace DicomGrep
     /// </summary>
     public partial class MainWindow : Window
     {
+        private Point _startDragPoint;
+        private ResultDicomFile _draggedFile;
+
         public MainWindow()
         {
             InitializeComponent();
@@ -30,5 +34,49 @@ private void About_OnClick(object sender, RoutedEventArgs e)
         {
             new AboutView().ShowDialog();
         }
+
+        private void DataGrid_MouseMove(object sender, MouseEventArgs e)
+        {
+            if (_draggedFile == null)
+            {
+                return;
+            }
+
+            Point currentPosition = e.GetPosition(null);
+            Vector dragDelta = currentPosition - _startDragPoint;
+
+            if (e.LeftButton == MouseButtonState.Pressed &&
+                (Math.Abs(dragDelta.X) > SystemParameters.MinimumHorizontalDragDistance ||
+                 Math.Abs(dragDelta.Y) > SystemParameters.MinimumVerticalDragDistance))
+            {
+                string[] filePaths = { _draggedFile.FullFilename };
+                DataObject dataObject = new DataObject(DataFormats.FileDrop, filePaths);
+
+                DragDrop.DoDragDrop((DataGrid)sender, dataObject, DragDropEffects.Copy);
+
+                _draggedFile = null;
+            }
+        }
+
+        private void DataGrid_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
+        {
+            _startDragPoint = e.GetPosition(null);
+            var dataGrid = sender as DataGrid;
+            var row = FindAncestor<DataGridRow>((DependencyObject)e.OriginalSource);
+            if (row != null)
+            {
+                _draggedFile = row.Item as ResultDicomFile;
+            }
+        }
+
+        private T FindAncestor<T>(DependencyObject dependencyObject) where T : DependencyObject
+        {
+            var parent = VisualTreeHelper.GetParent(dependencyObject);
+
+            if (parent == null) return null;
+
+            var parentT = parent as T;
+            return parentT ?? FindAncestor<T>(parent);
+        }
     }
 }