handleSearchBtn_Click, fillChildNode, buildResultTree теперь async. Создан TaskController для управления текущей задачей. Реализован ProgressReportModel для IProgress и последующего вывода информации из потока на форму. fillChildNode облагорожен, исправлена жившая в нем ошибка

fileFinder/MainForm.cs

@@ -8,11 +8,15 @@ using System.Text;
 using System.Threading.Tasks;
 using System.Windows.Forms;
 using System.IO;
+using System.Threading;
 
 namespace fileFinder
 {
     public partial class MainForm : Form
     {
+        bool hintHided = false;
+        TaskController mainController = new TaskController();
+
         public MainForm()
         {
             InitializeComponent();
@@ -43,7 +47,6 @@ namespace fileFinder
             }
         }
 
-        bool hintHided = false;
         private void curDirTextBox_Enter(object sender, EventArgs e)
         {
             if (!hintHided)
@@ -52,48 +55,77 @@ namespace fileFinder
                 curDirTextBox.Text = "";
             }
         }
-
-        private void handleSearchBtn_Click(object sender, EventArgs e)
+    
+        private async Task<TreeNode> buildResultTree(TaskController controller, IProgress<ProgressReportModel> report)
         {
-            resultViewer.Nodes.Clear();
-            List<String> foundFiles = new List<String>();
             TreeNode itemsNode = new TreeNode();
+            List<String> foundFiles = new List<String>();
+            ProgressReportModel _report = new ProgressReportModel();
 
             try
             {
                 foundFiles = Directory.GetFiles(curDirTextBox.Text, queryTextBox.Text, SearchOption.AllDirectories).ToList<String>();
-            } catch { }
+            }
+            catch (Exception ex)
+            {
+                var dialog = new ThreadExceptionDialog(ex);
+                dialog.ShowDialog();
+            }
 
+            int counter = 0;
             foreach (String item in foundFiles)
-                fillChildNode(itemsNode, item.Replace(curDirTextBox.Text, ""));
+            {
+                while (controller.isPaused)
+                    Thread.Sleep(100);
+                await fillChildNode(itemsNode, item.Replace(curDirTextBox.Text, ""));
+                _report.progress = counter;
+                _report.currentFileUrl = item;
+                report.Report(_report);
+            }
+            controller.stopTask();
+            return itemsNode;
+        }
 
-            resultViewer.Nodes.Add(itemsNode);
+        private void reportProgress(object sender, ProgressReportModel report)
+        {
+            infoLabel.Text = report.currentFileUrl;
         }
 
-        public void fillChildNode (TreeNode node, String item)
+        private async void handleSearchBtn_Click(object sender, EventArgs e)
+        {
+            Progress<ProgressReportModel> progress = new Progress<ProgressReportModel>();
+            progress.ProgressChanged += reportProgress;
+            TreeNode tN = await Task.Run(() => buildResultTree(mainController, progress));
+            resultViewer.Nodes.Clear();
+            resultViewer.Nodes.Add(tN);
+        }
+
+        public async Task fillChildNode (TreeNode node, String item)
         {
             int backSlashIndex = item.IndexOf("\\");
-            if (backSlashIndex > -1)
+            switch (backSlashIndex)
             {
-                if (backSlashIndex == 0)
-                {
+                case -1:
+                    node.Nodes.Add(item, item, 2, 2);
+                    break;
+                case 0:
                     item = item.Remove(0, 1);
-                    backSlashIndex = item.IndexOf("\\");
-                }
-                String currentNodeName = item.Substring(0, backSlashIndex);
-                int nodeIndex = node.Nodes.IndexOfKey(currentNodeName);
-                if (nodeIndex != -1)
-                    fillChildNode(node.Nodes[nodeIndex], item.Remove(0, backSlashIndex + 1));
-                else
-                {
-                    node.Nodes.Add(currentNodeName, currentNodeName, 0, 0);
-                    nodeIndex = node.Nodes.IndexOfKey(currentNodeName);
-                    fillChildNode(node.Nodes[nodeIndex], item.Remove(0, backSlashIndex + 1));
-                }
-            } else
-                node.Nodes.Add(item, item, 2, 2);
-        }
-
+                    await fillChildNode(node, item);
+                    break;
+                default:
+                    String currentNodeName = item.Substring(0, backSlashIndex);
+                    int nodeIndex = node.Nodes.IndexOfKey(currentNodeName);
 
+                    if (nodeIndex != -1)
+                        await fillChildNode(node.Nodes[nodeIndex], item.Remove(0, backSlashIndex + 1));
+                    else
+                    {
+                        node.Nodes.Add(currentNodeName, currentNodeName, 0, 0);
+                        nodeIndex = node.Nodes.IndexOfKey(currentNodeName);
+                        await fillChildNode(node.Nodes[nodeIndex], item.Remove(0, backSlashIndex + 1));
+                    }
+                    break;
+            }
+        }
     }
 }

fileFinder/ProgressReportModel.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace fileFinder
+{
+    class ProgressReportModel
+    {
+        public int progress { get; set; }
+        public string currentFileUrl { get; set; }
+    }
+}

fileFinder/TaskController.cs

@@ -0,0 +1,51 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace fileFinder
+{
+    class TaskController
+    {
+        public bool isPaused { get; private set; }
+        public bool isFinished { get; private set; }
+
+        public TaskController ()
+        {
+            isPaused = false;
+            isFinished = false;
+        }
+
+        public bool pauseTask()
+        {
+            if (!isPaused && !isFinished)
+            {
+                isPaused = true;
+                return true;
+            } else
+                return false;
+        }
+        
+        public bool resumeTask ()
+        {
+            if (isPaused && !isFinished)
+            {
+                isPaused = false;
+                return true;
+            } else
+                return false;
+        }
+
+        public bool stopTask ()
+        {
+            if (!isFinished)
+            {
+                isFinished = true;
+                return true;
+            } else
+                return false;
+        }
+
+    }
+}

fileFinder/fileFinder.csproj

@@ -52,7 +52,9 @@
       <DependentUpon>MainForm.cs</DependentUpon>
     </Compile>
     <Compile Include="Program.cs" />
+    <Compile Include="ProgressReportModel.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="TaskController.cs" />
     <EmbeddedResource Include="MainForm.resx">
       <DependentUpon>MainForm.cs</DependentUpon>
     </EmbeddedResource>