closes #3; Fix wrong outputs coming from asynchronous operation.

SimilarImages/SimilarImages/Form1.cs

@@ -180,6 +180,7 @@ private void bgw_Calculate_DoWork(object sender, DoWorkEventArgs e)
             Stopwatch watch = new Stopwatch();
             watch.Start();
 
+            tuples = null;
             tuples = ImageHash.GetSimilarity(folderPathes, out int count,
                 precision, interpolationMode, hashEnum, threshold);
             lb_Count.Invoke((Action)(() => { lb_Count.Text = count.ToString(); }));

SimilarImages/SimilarImages/ImageHash.cs

@@ -33,8 +33,8 @@ public static List<Tuple<string, string, double>> GetSimilarity(
             {
                 throw new DirectoryNotFoundException("Directory not found.");
             }
-            Debug.WriteLine($"Hash Algorithm: {hashEnum}\nPrecision: {precision}\n" +
-                            $"Interpolation Mode: {interpolationMode}\nThreshold: {threshold}%");
+            Debug.WriteLine($"HashAlgorithm: {hashEnum} Precision: {precision}\n" +
+                            $"InterpolationMode: {interpolationMode} Threshold: {threshold}%");
 
             watch.Restart();
 
@@ -62,7 +62,7 @@ public static List<Tuple<string, string, double>> GetSimilarity(
             watch.Restart();
 
             // Compare hashes
-            var tuples = new List<Tuple<string, string, double>>();
+            var tuples = new ConcurrentBag<Tuple<string, string, double>>();
             Parallel.For(0, imageHashPairs.Length, i =>
             {
                 for (int j = imageHashPairs.Length - 1; j > i; j--)
@@ -81,9 +81,10 @@ public static List<Tuple<string, string, double>> GetSimilarity(
             watch.Stop();
             long compareTime = watch.ElapsedMilliseconds;
             Debug.WriteLine($"GetHash: {hashTime}ms; CompareHash: {compareTime}ms");
+            Debug.WriteLine("TuplesCount:" + tuples.Count);
 
             // Sort by similarity
-            return tuples.OrderByDescending(u => u.Item3).ToList(); // TODO: seldom u=null.
+            return tuples.OrderByDescending(u => u.Item3).ToList();
         }
 
         public enum HashEnum
@@ -100,7 +101,7 @@ private static KeyValuePair<string, string>[] GetImageHashes(string folderPath,
             var imageNames = from file in di.GetFiles()
                              where imageExtensions.Contains(file.Extension)
                              select file.FullName;
-            Debug.WriteLine($"Directory: {folderPath}\nImage count: {imageNames.Count()}");
+            Debug.WriteLine($"Directory: {folderPath}; ImageCount: {imageNames.Count()}");
             if (imageNames.Count() < 2) { return null; }
 
             // Get hash algorithm
@@ -137,7 +138,7 @@ where imageExtensions.Contains(file.Extension)
             });
 
             watch.Stop();
-            Debug.WriteLine($"Valid count: {imageHashPairs.Count} elapsed time: {watch.ElapsedMilliseconds}ms");
+            Debug.WriteLine($"ValidCount: {imageHashPairs.Count}; ElapsedTime: {watch.ElapsedMilliseconds}ms");
             return imageHashPairs.ToArray();
         }
 

SimilarImages/SimilarImages/Properties/AssemblyInfo.cs

@@ -32,5 +32,5 @@
 //可以指定所有这些值，也可以使用“生成号”和“修订号”的默认值
 //通过使用 "*"，如下所示:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.3.0.0")]
-[assembly: AssemblyFileVersion("1.3.0.0")]
+[assembly: AssemblyVersion("1.3.1.0")]
+[assembly: AssemblyFileVersion("1.3.1.0")]