Merge remote-tracking branch 'origin/dev'

Former-commit-id: 86f92d49129f2d58dbef141e556a9380281964e0

build/Build.bat

@@ -1,6 +1,6 @@
 @ECHO OFF
 SET version=1.9.3.0
-SET webversion=3.2.7.0
+SET webversion=3.2.8.0
 SET webconfigversion=1.1.2.0
 
 ECHO Building ImageProcessor %version%, ImageProcess.Web %webversion% and ImageProcess.Web.Config %webconfigversion%

src/ImageProcessor.Web/NET45/Caching/DiskCache.cs

@@ -14,9 +14,9 @@ namespace ImageProcessor.Web.Caching
     using System;
     using System.Collections.Generic;
     using System.Diagnostics.CodeAnalysis;
+    using System.Globalization;
     using System.IO;
     using System.Linq;
-    using System.Security.Cryptography;
     using System.Threading.Tasks;
     using System.Web;
     using System.Web.Hosting;
@@ -286,14 +286,11 @@ namespace ImageProcessor.Web.Caching
                         {
                             // Pull the latest info.
                             imageFileInfo.Refresh();
-                            using (MD5 md5 = MD5.Create())
-                            {
-                                using (FileStream stream = File.OpenRead(imageFileInfo.FullName))
-                                {
-                                    byte[] hash = md5.ComputeHash(stream);
-                                    streamHash = BitConverter.ToString(hash);
-                                }
-                            }
+
+                            // Checking the stream itself is far too processor intensive so we make a best guess.
+                            string creation = imageFileInfo.CreationTimeUtc.ToString(CultureInfo.InvariantCulture);
+                            string length = imageFileInfo.Length.ToString(CultureInfo.InvariantCulture);
+                            streamHash = string.Format("{0}{1}", creation, length);
                         }
                     }
                 }

src/ImageProcessor.Web/NET45/Properties/AssemblyInfo.cs

@@ -35,5 +35,5 @@ using ImageProcessor.Web.HttpModules;
 //
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
-[assembly: AssemblyVersion("3.2.7.0")]
-[assembly: AssemblyFileVersion("3.2.7.0")]
+[assembly: AssemblyVersion("3.2.8.0")]
+[assembly: AssemblyFileVersion("3.2.8.0")]