Много рефакторинга. Теперь методы не влияющие на MainForm перенесены в TaskController. Добавлены обработчики _textChanged для TextBox'ов (отслеживание для запуска нового задания).

Добавлены методы restoreLastSession, changeVisibiltyResultViewer. Добавлен SearchQueryModel для хранения параметров поиска во время работы приложения.

fileFinder/App.config

@@ -10,7 +10,7 @@
     </startup>
     <userSettings>
         <fileFinder.MainSettings>
-            <setting name="urlDirectory" serializeAs="String">
+            <setting name="fileUrl" serializeAs="String">
                 <value>C:\nextcloud\</value>
             </setting>
             <setting name="fileNameQuery" serializeAs="String">

fileFinder/MainForm.Designer.cs

@@ -72,6 +72,7 @@
             this.curDirTextBox.Size = new System.Drawing.Size(650, 20);
             this.curDirTextBox.TabIndex = 1;
             this.curDirTextBox.Text = "C:\\Users\\itsmy_000\\Desktop\\a\\";
+            this.curDirTextBox.TextChanged += new System.EventHandler(this.curDirTextBox_TextChanged);
             this.curDirTextBox.Enter += new System.EventHandler(this.curDirTextBox_Enter);
             // 
             // splitContainer
@@ -105,7 +106,7 @@
             this.handleSearchBtn.Name = "handleSearchBtn";
             this.handleSearchBtn.Size = new System.Drawing.Size(120, 21);
             this.handleSearchBtn.TabIndex = 5;
-            this.handleSearchBtn.Text = "Start/Pause";
+            this.handleSearchBtn.Text = "Start Task";
             this.handleSearchBtn.UseVisualStyleBackColor = true;
             this.handleSearchBtn.Click += new System.EventHandler(this.handleSearchBtn_Click);
             // 
@@ -116,6 +117,7 @@
             this.innerQueryTextBox.Size = new System.Drawing.Size(650, 20);
             this.innerQueryTextBox.TabIndex = 4;
             this.innerQueryTextBox.Tag = "";
+            this.innerQueryTextBox.TextChanged += new System.EventHandler(this.innerQueryTextBox_TextChanged);
             // 
             // queryTextBox
             // 
@@ -125,6 +127,7 @@
             this.queryTextBox.TabIndex = 3;
             this.queryTextBox.Tag = "";
             this.queryTextBox.Text = "*.txt";
+            this.queryTextBox.TextChanged += new System.EventHandler(this.queryTextBox_TextChanged);
             // 
             // waitOrPauseLabel
             // 

fileFinder/MainForm.cs

@@ -17,6 +17,7 @@ namespace fileFinder
     {
         HintModel hints = new HintModel();
         TaskController mainController;
+        SearchQueryModel searchQueryModel;
         System.Timers.Timer updateInfoTimer = new System.Timers.Timer(1000);
 
         public MainForm()
@@ -26,6 +27,22 @@ namespace fileFinder
             this.updateInfoTimer.Elapsed += refreshInfoByTimer;
             this.updateInfoTimer.AutoReset = true;
             this.updateInfoTimer.Enabled = true;
+            fillImagesToResultViewer();
+            restoreLastSession();
+        }
+
+        private void restoreLastSession()
+        {
+            MainSettings sets = MainSettings.Default;
+            curDirTextBox.Text = sets.fileUrl;
+            innerQueryTextBox.Text = sets.fileInnerQuery;
+            queryTextBox.Text = sets.fileNameQuery;
+            searchQueryModel = mainController.updateSearchQueryModel(sets.fileUrl,
+                sets.fileInnerQuery, sets.fileNameQuery);
+        }
+
+        private void fillImagesToResultViewer()
+        {
             try
             {
                 ImageList iconList = new ImageList();
@@ -36,7 +53,8 @@ namespace fileFinder
                 resultViewer.ImageList = iconList;
                 resultViewer.ImageIndex = 3;
                 resultViewer.SelectedImageIndex = 3;
-            } catch { }
+            }
+            catch { }
         }
 
         private void dirSelectBtn_Click(object sender, EventArgs e)
@@ -61,78 +79,6 @@ namespace fileFinder
             //}
         }
     
-        private async Task<TreeNode> buildResultTree(TaskController controller, IProgress<ProgressReportModel> report)
-        {
-            TreeNode itemsNode = new TreeNode();
-            ProgressReportModel _report = new ProgressReportModel();
-            List<string> foundFiles = getFileList(curDirTextBox.Text, queryTextBox.Text);
-
-            int counter = 0;
-            foreach (string item in foundFiles)
-            {
-                while (controller.isPaused)
-                {                    
-                    Thread.Sleep(100);
-                    if (!controller.isFormUpdatedAfterPause)
-                    {
-                        controller.isFormUpdatedAfterPause = true;
-                        _report.progress = counter;
-                        _report.currentFileUrl = item;
-                        _report.currentTreeNode = (TreeNode) itemsNode.Clone();
-                        report.Report(_report);
-                    }
-                }
-
-                string[] fileLines = getFileContents(item);
-                _report.progress = counter;
-                _report.currentFileUrl = item;
-                report.Report(_report);
-
-                if ((fileLines.Length > 0) && (isFileContainQuery(fileLines, innerQueryTextBox.Text)))
-                {
-                    counter++;
-                    await fillChildNode(itemsNode, item.Replace(curDirTextBox.Text, ""));
-                }
-            }
-            controller.stopTask();
-            return itemsNode;
-        }
-
-        private List<string> getFileList (string directory, string nameQuery)
-        {
-            List<String> fileList = new List<String>();
-            try
-            {
-                fileList = Directory.GetFiles(directory, nameQuery, SearchOption.AllDirectories).ToList();
-            }
-            catch (Exception ex)
-            {
-                MessageBox.Show(ex.Message, "Не удалось получить доступ к файлу/папке");
-            }
-            return fileList;
-        }
-
-        private string[] getFileContents (string fileUrl)
-        {
-            try
-            {
-                return File.ReadAllLines(fileUrl, Encoding.UTF8);
-            }
-            catch (Exception ex)
-            {
-                MessageBox.Show(ex.Message, "Ошибка поиска внутри файла!");
-            }
-            return null;
-        }
-
-        private bool isFileContainQuery (string[] fileLines, string query)
-        {
-            foreach (string item in fileLines)
-                if (item.IndexOf(query) != -1)
-                    return true;
-            return false;
-        }
-
         private void reportProgress(object sender, ProgressReportModel report)
         {
             if (!mainController.isPaused)
@@ -146,55 +92,41 @@ namespace fileFinder
             Progress<ProgressReportModel> progress = new Progress<ProgressReportModel>();
             progress.ProgressChanged += reportProgress;
 
-            if (mainController.isStopped)
+            if (mainController.isStopped || mainController.isTaskChanged)
             {
+                searchQueryModel = mainController.updateSearchQueryModel(curDirTextBox.Text,
+                    queryTextBox.Text, innerQueryTextBox.Text);
                 handleSearchBtn.Text = "Pause Task";
                 waitOrPauseLabel.Visible = true;
                 resultViewer.Enabled = false;
                 mainController.beginTask();
-                TreeNode tN = await Task.Run(() => buildResultTree(mainController, progress));
+                TreeNode tN = await Task.Run(() => mainController.buildResultTree(searchQueryModel, progress));
                 updateResultViewer(tN);
+                changeVisibilityResultViewer();
                 handleSearchBtn.Text = "Start Task";
             } else if (mainController.isPaused)
             {
                 handleSearchBtn.Text = "Pause Task";
-                waitOrPauseLabel.Visible = true;
+                changeVisibilityResultViewer();
-                resultViewer.Enabled = false;
                 mainController.resumeTask();
             } else
             {
                 handleSearchBtn.Text = "Resume Task";
-                waitOrPauseLabel.Visible = false;
+                changeVisibilityResultViewer();
-                resultViewer.Enabled = true;
                 mainController.pauseTask();
             }
         }
 
-        public async Task fillChildNode (TreeNode node, String item)
+        private void changeVisibilityResultViewer()
         {
-            int backSlashIndex = item.IndexOf("\\");
+            if (mainController.isStopped || mainController.isPaused)
-            switch (backSlashIndex)
             {
-                case -1:
+                waitOrPauseLabel.Visible = false;
-                    node.Nodes.Add(item, item, 2, 2);
+                resultViewer.Enabled = true;
-                    break;
+            } else
-                case 0:
-                    item = item.Remove(0, 1);
-                    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);
+                waitOrPauseLabel.Visible = true;
-                        nodeIndex = node.Nodes.IndexOfKey(currentNodeName);
+                resultViewer.Enabled = false;
-                        await fillChildNode(node.Nodes[nodeIndex], item.Remove(0, backSlashIndex + 1));
-                    }
-                    break;
             }
         }
         
@@ -230,10 +162,25 @@ namespace fileFinder
 
         private void MainForm_FormClosing(object sender, FormClosingEventArgs e)
         {
-            MainSettings.Default.urlDirectory = curDirTextBox.Text;
+            MainSettings.Default.fileUrl = curDirTextBox.Text;
             MainSettings.Default.fileNameQuery = queryTextBox.Text;
             MainSettings.Default.fileInnerQuery = innerQueryTextBox.Text;
             MainSettings.Default.Save();
         }
+
+        private void curDirTextBox_TextChanged(object sender, EventArgs e)
+        {
+            mainController.isTaskChanged = true;
+        }
+
+        private void queryTextBox_TextChanged(object sender, EventArgs e)
+        {
+            mainController.isTaskChanged = true;
+        }
+
+        private void innerQueryTextBox_TextChanged(object sender, EventArgs e)
+        {
+            mainController.isTaskChanged = true;
+        }
     }
 }

fileFinder/MainSettings.Designer.cs

@@ -26,12 +26,12 @@ namespace fileFinder {
         [global::System.Configuration.UserScopedSettingAttribute()]
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
         [global::System.Configuration.DefaultSettingValueAttribute("C:\\nextcloud\\")]
-        public string urlDirectory {
+        public string fileUrl {
             get {
-                return ((string)(this["urlDirectory"]));
+                return ((string)(this["fileUrl"]));
             }
             set {
-                this["urlDirectory"] = value;
+                this["fileUrl"] = value;
             }
         }
         

fileFinder/MainSettings.settings

@@ -2,7 +2,7 @@
 <SettingsFile xmlns="http://schemas.microsoft.com/VisualStudio/2004/01/settings" CurrentProfile="(Default)" GeneratedClassNamespace="fileFinder" GeneratedClassName="MainSettings">
   <Profiles />
   <Settings>
-    <Setting Name="urlDirectory" Type="System.String" Scope="User">
+    <Setting Name="fileUrl" Type="System.String" Scope="User">
       <Value Profile="(Default)">C:\nextcloud\</Value>
     </Setting>
     <Setting Name="fileNameQuery" Type="System.String" Scope="User">

fileFinder/SearchQueryModel.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace fileFinder
+{
+    class SearchQueryModel 
+    {
+        public string fileUrl { get; set; }
+        public string fileNameQuery { get; set; }
+        public string fileInnerQuery { get; set; }
+    }
+}

fileFinder/TaskController.cs

@@ -1,10 +1,13 @@
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
+using System.IO;
 using System.Linq;
 using System.Text;
+using System.Threading;
 using System.Threading.Tasks;
 using System.Timers;
+using System.Windows.Forms;
 
 namespace fileFinder
 {
@@ -13,6 +16,7 @@ namespace fileFinder
         public bool isPaused { get; private set; }
         public bool isStopped { get; private set; }
         public bool isFormUpdatedAfterPause { get; set; }
+        public bool isTaskChanged { get; set; }
         private Stopwatch stopwatch = new Stopwatch();
 
         public TaskController ()
@@ -20,53 +24,158 @@ namespace fileFinder
             isPaused = false;
             isStopped = true;
             isFormUpdatedAfterPause = true;
+            isTaskChanged = false;
         }
 
-        public bool beginTask ()
+        public void beginTask ()
         {
             isPaused = false;
             isStopped = false;
             stopwatch.Restart();
-            return true;
         }
 
-        public bool pauseTask ()
+        public void pauseTask ()
         {
             if (!isPaused && !isStopped)
             {
                 isPaused = true;
                 isFormUpdatedAfterPause = false;
                 stopwatch.Stop();
-                return true;
+            }
-            } else
-                return false;
         }
         
-        public bool resumeTask ()
+        public void resumeTask ()
         {
             if (isPaused && !isStopped)
             {
                 isPaused = false;
                 stopwatch.Start();
-                return true;
+            }
-            } else
-                return false;
         }
 
-        public bool stopTask ()
+        public void stopTask ()
         {
             if (!isStopped)
             {
                 isStopped = true;
                 stopwatch.Stop();
-                return true;
+            } 
-            } else
-                return false;
         }
 
         public TimeSpan elapsedTime ()
         {
             return stopwatch.Elapsed;
         }
+
+        public async Task<TreeNode> buildResultTree(SearchQueryModel query, IProgress <ProgressReportModel> report)
+        {
+            TaskController controller = this;
+            TreeNode itemsNode = new TreeNode();
+            ProgressReportModel _report = new ProgressReportModel();
+            List<string> foundFiles = getFileList(query.fileUrl, query.fileNameQuery);
+
+            int counter = 0;
+            foreach (string item in foundFiles)
+            {
+                while (controller.isPaused)
+                {
+                    Thread.Sleep(100);
+                    if (!controller.isFormUpdatedAfterPause)
+                    {
+                        controller.isFormUpdatedAfterPause = true;
+                        _report.progress = counter;
+                        _report.currentFileUrl = item;
+                        _report.currentTreeNode = (TreeNode)itemsNode.Clone();
+                        report.Report(_report);
+                    }
+                }
+
+                string[] fileLines = getFileContents(item);
+                _report.progress = counter;
+                _report.currentFileUrl = item;
+                report.Report(_report);
+
+                if ((fileLines.Length > 0) && (isFileContainQuery(fileLines, query.fileInnerQuery)))
+                {
+                    counter++;
+                    await fillChildNode(itemsNode, item.Replace(query.fileUrl, ""));
+                }
+            }
+            controller.stopTask();
+            return itemsNode;
+        }
+
+
+        private List<string> getFileList(string directory, string nameQuery)
+        {
+            List<String> fileList = new List<String>();
+            try
+            {
+                fileList = Directory.GetFiles(directory, nameQuery, SearchOption.AllDirectories).ToList();
+            }
+            catch (Exception ex)
+            {
+                MessageBox.Show(ex.Message, "Не удалось получить доступ к файлу/папке");
+            }
+            return fileList;
+        }
+
+        private string[] getFileContents(string fileUrl)
+        {
+            try
+            {
+                return File.ReadAllLines(fileUrl, Encoding.UTF8);
+            }
+            catch (Exception ex)
+            {
+                MessageBox.Show(ex.Message, "Ошибка поиска внутри файла!");
+            }
+            return null;
+        }
+
+        private bool isFileContainQuery(string[] fileLines, string query)
+        {
+            foreach (string item in fileLines)
+                if (item.IndexOf(query) != -1)
+                    return true;
+            return false;
+        }
+
+        public async Task fillChildNode(TreeNode node, String item)
+        {
+            int backSlashIndex = item.IndexOf("\\");
+            switch (backSlashIndex)
+            {
+                case -1:
+                    node.Nodes.Add(item, item, 2, 2);
+                    break;
+                case 0:
+                    item = item.Remove(0, 1);
+                    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;
+            }
+        }
+
+        public SearchQueryModel updateSearchQueryModel(string fileUrl, string fileNameQuery, string fileInnerQuery)
+        {
+            SearchQueryModel sqModel = new SearchQueryModel();
+            sqModel.fileUrl = fileUrl;
+            sqModel.fileNameQuery = fileNameQuery;
+            sqModel.fileInnerQuery = fileInnerQuery;
+            return sqModel;
+        }
     }
 }

fileFinder/fileFinder.csproj

@@ -61,6 +61,7 @@
     <Compile Include="Program.cs" />
     <Compile Include="ProgressReportModel.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="SearchQueryModel.cs" />
     <Compile Include="TaskController.cs" />
     <EmbeddedResource Include="MainForm.resx">
       <DependentUpon>MainForm.cs</DependentUpon>