FileIconService added to allow custom template icons to be loaded from the file system.

src/Main/Base/Project/ICSharpCode.SharpDevelop.csproj

@@ -474,6 +474,7 @@
     <Compile Include="Src\Services\DisplayBinding\ExternalProcessDisplayBinding.cs" />
     <Compile Include="Src\Services\DisplayBinding\ISecondaryDisplayBinding.cs" />
     <Compile Include="Src\Services\DisplayBinding\ShellExecuteDisplayBinding.cs" />
+    <Compile Include="Src\Services\FileIconService.cs" />
     <Compile Include="Src\Services\File\FileChangeWatcher.cs" />
     <Compile Include="Src\Services\File\OpenedFile.cs" />
     <Compile Include="Src\Services\File\RecentOpen.cs" />

src/Main/Base/Project/Src/Services/FileIconService.cs

@@ -0,0 +1,61 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using ICSharpCode.Core;
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+
+namespace ICSharpCode.SharpDevelop
+{
+	/// <summary>
+	/// This Class contains a ResourceManager, which handles bitmap resources
+	/// for the application which were loaded from the filesystem.
+	/// </summary>
+	public static class FileIconService
+	{
+		static Dictionary<string, Bitmap> bitmapCache = new Dictionary<string, Bitmap>();
+		
+		static FileIconService()
+		{
+			ResourceService.ClearCaches += ResourceService_ClearCaches;
+		}
+		
+		static void ResourceService_ClearCaches(object sender, EventArgs e)
+		{
+			lock (bitmapCache) {
+				bitmapCache.Clear();
+			}
+		}
+		
+		/// <summary>
+		/// Returns a bitmap from the file system. Paceholders like ${SharpDevelopBinPath}
+		/// and AddinPath (e. g. ${AddInPath:ICSharpCode.FiletypeRegisterer}) are resolved 
+		/// through the StringParser.
+		/// The bitmaps are reused, you must not dispose the Bitmap!
+		/// </summary>
+		/// <returns>
+		/// The bitmap loaded from the file system.
+		/// </returns>
+		/// <param name="name">
+		/// The name of the requested bitmap (prefix, path and filename).
+		/// </param>
+		/// <exception cref="FileNotFoundException">
+		/// Is thrown when the bitmap was not found in the file system.
+		/// </exception>
+		public static Bitmap GetBitmap(string name)
+		{
+			Bitmap bmp = null;
+            if (name.ToUpper().StartsWith("FILE:")) {
+				lock (bitmapCache) {
+					if (bitmapCache.TryGetValue(name, out bmp))
+						return bmp;
+                    bmp = (Bitmap)Image.FromFile(StringParser.Parse(name.Substring(5,name.Length-5)));
+					bitmapCache[name] = bmp;
+				}
+			}
+			return bmp;
+		}
+	}
+}
+

src/Main/Base/Project/Src/Services/IconService.cs

@@ -60,18 +60,21 @@ namespace ICSharpCode.SharpDevelop
 		
 		public static Bitmap GetBitmap(string name)
 		{
-			Bitmap bmp;
-			try {
-				bmp = WinFormsResourceService.GetBitmap(name);
-			} catch (ResourceNotFoundException ex) {
-				LoggingService.Warn(ex);
-				bmp = null;
-			}
-			if (bmp != null) {
-				return bmp;
-			}
-			
-			return WinFormsResourceService.GetBitmap("Icons.16x16.MiscFiles");
+			Bitmap bmp = null;
+		    try {
+	            bmp = FileIconService.GetBitmap(name);
+                if (bmp == null) {
+    	            bmp = WinFormsResourceService.GetBitmap(name);
+                }
+            } catch (ResourceNotFoundException ex) {
+                     LoggingService.Warn(ex);
+            } catch (FileNotFoundException ex) {
+                     LoggingService.Warn(ex);
+            }
+            if (bmp != null) {
+                return bmp;
+            }
+            return WinFormsResourceService.GetBitmap("Icons.16x16.MiscFiles");
 		}
 		
 		public static Icon GetIcon(string name)