private async Task <string> ImportImage(string fileName, string id, bool overwrite)
{
if (FileMetaDataStore.Contains(fileName))
{
return(fileName);
}
var prefix = this.GetType().Name;
var result = default(string);
if (overwrite || !FileMetaDataStore.Exists(prefix, id, out result))
{
#if NET40
Semaphore.Wait();
#else
await Semaphore.WaitAsync().ConfigureAwait(false);
#endif
try
{
if (overwrite || !FileMetaDataStore.Exists(prefix, id, out result))
{
return(await FileMetaDataStore.WriteAsync(prefix, id, fileName).ConfigureAwait(false));
}
}
finally
{
Semaphore.Release();
}
}
return(result);
}
private static Task <string> ImportImage(string fileName, string id, bool overwrite)
{
if (FileMetaDataStore.Contains(fileName))
{
//The file is already in the data store.
#if NET40
return(TaskEx.FromResult(fileName));
#else
return(Task.FromResult(fileName));
#endif
}
return(FileMetaDataStore.IfNotExistsAsync(PREFIX, id, result => FileMetaDataStore.CopyAsync(PREFIX, id, fileName), overwrite));
}
