/// <summary>
/// Wrapper around File.Copy to provide feedback as to whether the file wasn't copied because it didn't exist.
/// </summary>
/// <param name="cachePath"></param>
/// <param name="suggestedPath"></param>
/// <param name="overwrite"></param>
/// <returns></returns>
public static string SafeCopyFile(string sourceFileName, string destFileName, SafeCopyFileOptions options)
{
switch (options)
{
case SafeCopyFileOptions.PreserveOriginal:
if (!File.Exists(destFileName))
{
File.Copy(sourceFileName, destFileName);
return destFileName;
}
return null;
case SafeCopyFileOptions.Overwrite:
File.Copy(sourceFileName, destFileName, true);
return destFileName;
case SafeCopyFileOptions.FindBetterName:
string directoryPart = Path.GetDirectoryName(destFileName);
string fileNamePart = Path.GetFileNameWithoutExtension(destFileName);
string extensionPart = Path.GetExtension(destFileName);
foreach (string path in GenerateFileNames(directoryPart, fileNamePart, extensionPart))
{
if (!File.Exists(path))
{
File.Copy(sourceFileName, path);
return path;
}
}
return null;
}
throw new ArgumentException("Invalid enumeration value", "options");
}
internal void SaveToFile(FacebookImageDimensions requestedSize, string path, bool addExtension, FacebookImageSaveOptions options, SaveImageAsyncCallback callback, object userState, int?index, int?total)
{
Verify.IsNeitherNullNorEmpty(path, "path");
Verify.IsNotNull(callback, "callback");
Assert.Implies(total != null, index != null);
Assert.Implies(total == null, index == null);
SafeCopyFileOptions scfo = (options == FacebookImageSaveOptions.FindBetterName)
? SafeCopyFileOptions.FindBetterName
: (options == FacebookImageSaveOptions.Overwrite)
? SafeCopyFileOptions.Overwrite
: SafeCopyFileOptions.PreserveOriginal;
SourceService.WebGetter.GetLocalImagePathAsync(this, null, _GetSmallUriFromRequestedSize(requestedSize),
(sender, e) =>
{
string cachePath = e.ImagePath;
if (addExtension)
{
string ext = Path.GetExtension(cachePath);
path = Path.ChangeExtension(path, ext);
}
try
{
string actualPath = Utility.SafeCopyFile(cachePath, path, scfo);
if (actualPath == null)
{
throw new IOException("Unable to save the image to the requested location.");
}
SaveImageCompletedEventArgs sicea = null;
if (total == null)
{
sicea = new SaveImageCompletedEventArgs(actualPath, userState);
}
else
{
sicea = new SaveImageCompletedEventArgs(actualPath, index.Value, total.Value, userState);
}
callback(this, sicea);
return;
}
catch (Exception ex)
{
callback(this, new SaveImageCompletedEventArgs(ex, false, userState));
return;
}
});
}
public static string SafeCopyFile(string sourceFileName, string destFileName, SafeCopyFileOptions options)
{
switch (options)
{
case SafeCopyFileOptions.PreserveOriginal:
if (!File.Exists(destFileName))
{
File.Copy(sourceFileName, destFileName);
return(destFileName);
}
return(null);
case SafeCopyFileOptions.Overwrite:
File.Copy(sourceFileName, destFileName, true);
return(destFileName);
case SafeCopyFileOptions.FindBetterName:
string directoryPart = Path.GetDirectoryName(destFileName);
string fileNamePart = Path.GetFileNameWithoutExtension(destFileName);
string extensionPart = Path.GetExtension(destFileName);
foreach (string path in GenerateFileNames(directoryPart, fileNamePart, extensionPart))
{
if (!File.Exists(path))
{
File.Copy(sourceFileName, path);
return(path);
}
}
return(null);
}
throw new ArgumentException("Invalid enumeration value", "options");
}
public static string SafeCopyFile(string sourceFileName, string destFileName, SafeCopyFileOptions options)
{
string str;
switch (options)
{
case SafeCopyFileOptions.PreserveOriginal:
{
if (File.Exists(destFileName))
{
return(null);
}
File.Copy(sourceFileName, destFileName);
return(destFileName);
}
case SafeCopyFileOptions.Overwrite:
{
File.Copy(sourceFileName, destFileName, true);
return(destFileName);
}
case SafeCopyFileOptions.FindBetterName:
{
string directoryName = Path.GetDirectoryName(destFileName);
string fileNameWithoutExtension = Path.GetFileNameWithoutExtension(destFileName);
string extension = Path.GetExtension(destFileName);
using (IEnumerator <string> enumerator = Utility.GenerateFileNames(directoryName, fileNameWithoutExtension, extension).GetEnumerator())
{
while (enumerator.MoveNext())
{
string current = enumerator.Current;
if (File.Exists(current))
{
continue;
}
File.Copy(sourceFileName, current);
str = current;
return(str);
}
return(null);
}
return(str);
}
default:
{
throw new ArgumentException("Invalid enumeration value", "options");
}
}
return(null);
}
