/// <summary>
/// Gets the default picture URL
/// </summary>
/// <param name="targetSize">The target picture size (longest side)</param>
/// <param name="defaultPictureType">Default picture type</param>
/// <returns>Picture URL</returns>
public virtual string GetDefaultPictureUrl(int targetSize = 0)
{
string filePath = GetPictureLocalPath(DefaultPictureFileName);
if (!File.Exists(filePath))
{
return(string.Empty);
}
if (targetSize == 0)
{
return(string.Format("{0}{1}/{2}",
_webHelper.GetCurrentLocation(),
PictureFolder,
DefaultPictureFileName));
}
string fileExtension = Path.GetExtension(filePath);
string thumbFileName = string.Format("{0}_{1}{2}", Path.GetFileNameWithoutExtension(filePath), targetSize, fileExtension);
string thumbFilePath = GetThumbLocalPath(thumbFileName);
//the named mutex helps to avoid creating the same files in different threads,
//and does not decrease performance significantly, because the code is blocked only for the specific file.
using (var mutex = new Mutex(false, thumbFileName))
{
if (!File.Exists(thumbFilePath))
{
mutex.WaitOne();
//check, if the file was created, while we were waiting for the release of the mutex.
if (!File.Exists(thumbFilePath))
{
using (Image <Rgba32> b = Image.Load(filePath))
{
using (var ms = new MemoryStream())
{
var newSize = CalculateDimensions(new Size(b.Width, b.Height), targetSize);
var options = new ResizeOptions
{
Size = new SixLabors.Primitives.Size(newSize.Width, newSize.Height),
Mode = ResizeMode.Pad
};
b.Mutate(x => x.Resize(options));
b.Save(ms, ImageFormats.Jpeg);
//save to file
SaveThumbToFile(thumbFilePath, ms.ToArray());
}
}
}
mutex.ReleaseMutex();
}
}
return(string.Format("{0}{1}/{2}",
_webHelper.GetCurrentLocation(),
ThumbFolder,
thumbFileName));
}
