First attempt at finding duplicate files. For now, and possible ever, this process will be a 'best effort' approach, so there will be false positives but this will most likely remain the case for the life of this program.

DataOrganizer/FileManager.Designer.cs

@@ -53,6 +53,10 @@
             this.SelectedFolderViewGroupTreeView = new System.Windows.Forms.TreeView();
             this.ComparisionFolderViewGroupBox = new System.Windows.Forms.GroupBox();
             this.ComparisionFolderViewTreeView = new System.Windows.Forms.TreeView();
+            this.groupBox1 = new System.Windows.Forms.GroupBox();
+            this.textBox1 = new System.Windows.Forms.TextBox();
+            this.button1 = new System.Windows.Forms.Button();
+            this.button2 = new System.Windows.Forms.Button();
             this.MainLayoutPanel.SuspendLayout();
             this.MainMenuStrip.SuspendLayout();
             this.DiffResultsGroupBox.SuspendLayout();
@@ -61,6 +65,7 @@
             this.statusStrip1.SuspendLayout();
             this.SelectedGroupFolderViewGroupBox.SuspendLayout();
             this.ComparisionFolderViewGroupBox.SuspendLayout();
+            this.groupBox1.SuspendLayout();
             this.SuspendLayout();
             // 
             // MainLayoutPanel
@@ -78,6 +83,7 @@
             this.MainLayoutPanel.Controls.Add(this.statusStrip1, 0, 4);
             this.MainLayoutPanel.Controls.Add(this.SelectedGroupFolderViewGroupBox, 2, 2);
             this.MainLayoutPanel.Controls.Add(this.ComparisionFolderViewGroupBox, 2, 3);
+            this.MainLayoutPanel.Controls.Add(this.groupBox1, 2, 1);
             this.MainLayoutPanel.Dock = System.Windows.Forms.DockStyle.Fill;
             this.MainLayoutPanel.Location = new System.Drawing.Point(0, 0);
             this.MainLayoutPanel.Name = "MainLayoutPanel";
@@ -326,6 +332,46 @@
             this.ComparisionFolderViewTreeView.Size = new System.Drawing.Size(420, 326);
             this.ComparisionFolderViewTreeView.TabIndex = 0;
             // 
+            // groupBox1
+            // 
+            this.groupBox1.Controls.Add(this.button2);
+            this.groupBox1.Controls.Add(this.button1);
+            this.groupBox1.Controls.Add(this.textBox1);
+            this.groupBox1.Dock = System.Windows.Forms.DockStyle.Fill;
+            this.groupBox1.Location = new System.Drawing.Point(877, 43);
+            this.groupBox1.Name = "groupBox1";
+            this.groupBox1.Size = new System.Drawing.Size(426, 172);
+            this.groupBox1.TabIndex = 12;
+            this.groupBox1.TabStop = false;
+            this.groupBox1.Text = "groupBox1";
+            // 
+            // textBox1
+            // 
+            this.textBox1.Location = new System.Drawing.Point(29, 34);
+            this.textBox1.Name = "textBox1";
+            this.textBox1.Size = new System.Drawing.Size(239, 26);
+            this.textBox1.TabIndex = 0;
+            // 
+            // button1
+            // 
+            this.button1.Location = new System.Drawing.Point(296, 38);
+            this.button1.Name = "button1";
+            this.button1.Size = new System.Drawing.Size(75, 23);
+            this.button1.TabIndex = 1;
+            this.button1.Text = "button1";
+            this.button1.UseVisualStyleBackColor = true;
+            this.button1.Click += new System.EventHandler(this.button1_Click);
+            // 
+            // button2
+            // 
+            this.button2.Location = new System.Drawing.Point(16, 120);
+            this.button2.Name = "button2";
+            this.button2.Size = new System.Drawing.Size(112, 46);
+            this.button2.TabIndex = 2;
+            this.button2.Text = "button2";
+            this.button2.UseVisualStyleBackColor = true;
+            this.button2.Click += new System.EventHandler(this.button2_Click);
+            // 
             // FileManager
             // 
             this.AutoScaleDimensions = new System.Drawing.SizeF(9F, 20F);
@@ -346,6 +392,8 @@
             this.statusStrip1.PerformLayout();
             this.SelectedGroupFolderViewGroupBox.ResumeLayout(false);
             this.ComparisionFolderViewGroupBox.ResumeLayout(false);
+            this.groupBox1.ResumeLayout(false);
+            this.groupBox1.PerformLayout();
             this.ResumeLayout(false);
 
         }
@@ -377,5 +425,9 @@
         private System.Windows.Forms.TreeView SelectedFolderViewGroupTreeView;
         private System.Windows.Forms.GroupBox ComparisionFolderViewGroupBox;
         private System.Windows.Forms.TreeView ComparisionFolderViewTreeView;
+        private System.Windows.Forms.GroupBox groupBox1;
+        private System.Windows.Forms.Button button1;
+        private System.Windows.Forms.TextBox textBox1;
+        private System.Windows.Forms.Button button2;
     }
 }

DataOrganizer/FileManager.cs

@@ -77,17 +77,47 @@ namespace DataOrganizer
             var db = new DB();
             var p = GetProfileToCompare();
             var f = GetFolderGroupToCompare();
+            var renames = new List<SnapshotComparsion.RenamedFile>();
             ComparisionSnapshot = new Snapshot(db.GetFilesForProfileByFolderGroup(p.Id, f.Id), f);
             var diff = ActiveSnapshot.Diff(ComparisionSnapshot);
 
-            foreach(var file in diff.NewFiles)
+            //foreach (var folder in ActiveSnapshot.Directories.Values)
-                AddFileSnapshotToDiffView(file, GetSelectedFolderGroup(), FileSnapshot.FileStatus.PendingInsert);
+            //{
+            //    if (ComparisionSnapshot.Directories.ContainsKey(folder.FullPath))
+            //    {
+            //        renames.AddRange(ActiveSnapshot.FindFileRenames(folder, ComparisionSnapshot.Directories[folder.FullPath]));
+            //    }
+            //}
 
-            foreach (var file in diff.ModifiedFiles)
+            //foreach (var rename in renames)
-                AddFileSnapshotToDiffView(file, GetSelectedFolderGroup(), FileSnapshot.FileStatus.PendingUpdate);
+            //{
+            //    DiffViewTreeView.Nodes.Add($"From: {rename.From.Name}");
+            //    DiffViewTreeView.Nodes.Add($"To: {rename.To.Name}");
+            //}
+            var dupCount = 0;
 
-            foreach (var file in diff.DeletedFiles)
+            foreach(var folder in ActiveSnapshot.TopLevelFolders.Keys)
-                AddFileSnapshotToDiffView(file, GetSelectedFolderGroup(), FileSnapshot.FileStatus.PendingDelete);
+            {
+                foreach(var dup in ActiveSnapshot.FindDuplicates(ActiveSnapshot.Directories[folder]))
+                {
+                    var node = new TreeNode($"{dup.File.Name} ({dup.Duplicates.Count})") { ToolTipText = dup.File.FullPath };
+                    foreach(var d in dup.Duplicates)
+                    {
+                        node.Nodes.Add(new TreeNode(d.Name) { ToolTipText = d.FullPath });
+                        dupCount++;
+                    }
+                    DiffViewTreeView.Nodes.Add(node);
+                }
+            }
+            UpdateStatusLabel($"Found {dupCount} duplicate files.");
+            //foreach(var file in diff.NewFiles)
+            //    AddFileSnapshotToDiffView(file, GetSelectedFolderGroup(), FileSnapshot.FileStatus.PendingInsert);
+
+            //foreach (var file in diff.ModifiedFiles)
+            //    AddFileSnapshotToDiffView(file, GetSelectedFolderGroup(), FileSnapshot.FileStatus.PendingUpdate);
+
+            //foreach (var file in diff.DeletedFiles)
+            //    AddFileSnapshotToDiffView(file, GetSelectedFolderGroup(), FileSnapshot.FileStatus.PendingDelete);
         }
 
         private void AddFileSnapshotToDiffView(FileSnapshot file, DB.FolderGroup folderGroup, FileSnapshot.FileStatus fileStatus = FileSnapshot.FileStatus.None)
@@ -324,5 +354,21 @@ namespace DataOrganizer
             StatusLabel.Text = message;
             statusStrip1.Refresh();
         }
+
+        private void button1_Click(object sender, EventArgs e)
+        {
+            var form = new FolderBrowserDialog();
+
+            if(form.ShowDialog() == DialogResult.OK)
+            {
+                textBox1.Text = form.SelectedPath;
+            }
+        }
+
+        private void button2_Click(object sender, EventArgs e)
+        {
+            //Compare
+            
+        }
     }
 }

DataOrganizer/FileManager.resx

@@ -123,10 +123,4 @@
   <metadata name="statusStrip1.TrayLocation" type="System.Drawing.Point, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
     <value>205, 17</value>
   </metadata>
-  <metadata name="MainMenuStrip.TrayLocation" type="System.Drawing.Point, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
-    <value>17, 17</value>
-  </metadata>
-  <metadata name="statusStrip1.TrayLocation" type="System.Drawing.Point, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
-    <value>205, 17</value>
-  </metadata>
 </root>

DataOrganizer/Snapshot.cs

@@ -272,9 +272,41 @@ namespace DataOrganizer
             return renames;
         }
 
+        public List<Duplicate> FindDuplicates(Folder topLevelFolder)
+        {
+            var duplicates = new Dictionary<string, Duplicate>();
+            var files = topLevelFolder.GetAllFiles();
+            var fileCount = 0;
+
+            fileCount = files.Count;
+
+            for(var i = 0; i < fileCount; i++)
+            {
+                var file = files[i];
+
+                //if (!duplicates.ContainsKey(file.FullPath)) duplicates.Add(file.FullPath, new Duplicate() { File = file, Duplicates = new List<FileSnapshot>() });
+
+                var dups = files.Where(x => x.Size == file.Size && x.FileId != file.FileId).ToList();
+                var dupCount = dups.Count;
+
+                if(dupCount > 0)
+                    if (!duplicates.ContainsKey(file.FullPath)) duplicates.Add(file.FullPath, new Duplicate() { File = file, Duplicates = new List<FileSnapshot>() });
+
+                for (var j = 0; j < dupCount; j++)
+                {
+                    var dup = dups[j];
+                    files.Remove(dup);
+                    duplicates[file.FullPath].Duplicates.Add(dup);
+                    fileCount--;
+                }
+            }
+
+            return duplicates.Values.ToList();
+        }
+
         public struct Duplicate
         {
-            public DB.DBFileSnapshot File;
+            public FileSnapshot File;
             public List<FileSnapshot> Duplicates;
         }
     }