[DATFromDir] Add async delete

SabreTools.Helper/Objects/DATFromDir.cs

@@ -190,18 +190,7 @@ namespace SabreTools
 					new ParallelOptions { MaxDegreeOfParallelism = _maxDegreeOfParallelism },
 					file =>
 				{
-					int i = 0;
-					while (File.Exists(file) && i < 50)
-					{
-						try
-						{
-							Directory.Delete(Path.GetDirectoryName(file), true);
-						}
-						catch
-						{
-							i++;
-						}
-					}
+					FileTools.DeleteFile(file);
 				});
 			}
 
@@ -320,22 +309,7 @@ namespace SabreTools
 				// Cue to delete the file if it's a copy
 				if (_copyFiles)
 				{
-					int i = 0;
-					while (File.Exists(newItem) && i < 50)
-					{
-						try
-						{
-							Directory.Delete(Path.GetDirectoryName(newItem), true);
-						}
-						catch
-						{
-							i++;
-						}
-					}
-					if (File.Exists(newItem))
-					{
-						_clean.Add(newItem);
-					}
+					FileTools.DeleteFile(newItem);
 				}
 
 				// Delete the sub temp directory

SabreTools.Helper/Tools/FileTools.cs

@@ -11,6 +11,7 @@ using System.IO.Compression;
 using System.Linq;
 using System.Security.Cryptography;
 using System.Text.RegularExpressions;
+using System.Threading.Tasks;
 
 namespace SabreTools.Helper
 {
@@ -1237,6 +1238,29 @@ namespace SabreTools.Helper
 			}
 		}
 
+		/// <summary>
+		/// Delete a file asynchronously
+		/// </summary>
+		/// <param name="filename">Name of the file to be deleted</param>
+		public async static void DeleteFile(string filename)
+		{
+			FileInfo fi = new FileInfo(filename);
+			await Task.Factory.StartNew(() =>
+			{
+				while (fi.Exists)
+				{
+					try
+					{
+						fi.Delete();
+					}
+					catch
+					{
+
+					}
+				}
+			});
+		}
+
 		#endregion
 	}
 }