/// <summary>
/// 插入图片
/// </summary>
/// <param name="pictureBinary">字节大小</param>
/// <param name="mimeType">图片后缀</param>
/// <param name="seoFilename">Seo 文件名</param>
/// <param name="isNew">是否新图片</param>
/// <param name="validateBinary">该值表示是否要提供验证图片的二进制</param>
/// <returns>图片对象</returns>
public virtual Picture InsertPicture(byte[] pictureBinary, string mimeType, string seoFilename,
bool isNew, bool validateBinary = true)
{
mimeType = CommonHelper.EnsureNotNull(mimeType);
mimeType = CommonHelper.EnsureMaximumLength(mimeType, 20);
seoFilename = CommonHelper.EnsureMaximumLength(seoFilename, 100);
if (validateBinary)
pictureBinary = ValidatePicture(pictureBinary, mimeType);
var picture = new Picture()
{
MimeType = mimeType,
SeoFilename = seoFilename,
IsNew = isNew,
};
_pictureRepository.Insert(picture);
SavePictureInFile(picture.Id, pictureBinary, mimeType);
return picture;
}
/// <summary>
/// 删除图片
/// </summary>
/// <param name="picture">Picture</param>
public virtual void DeletePicture(Picture picture)
{
if (picture == null)
throw new ArgumentNullException("picture");
//delete thumbs
DeletePictureThumbs(picture);
//delete from file system
DeletePictureOnFileSystem(picture);
//delete from database
_pictureRepository.Delete(picture);
}
/// <summary>
/// 获取缩略图路径
/// </summary>
/// <param name="picture">图片对象</param>
/// <param name="targetSize">图片大小</param>
/// <param name="showDefaultPicture">是否显示默认图像</param>
/// <returns>缩略图路径</returns>
public virtual string GetThumbLocalPath(Picture picture, int targetSize = 0, bool showDefaultPicture = true)
{
string url = GetPictureUrl(picture, targetSize, showDefaultPicture);
if(String.IsNullOrEmpty(url))
return String.Empty;
else
return GetThumbLocalPath(Path.GetFileName(url));
}
/// <summary>
/// 获取图片路径
/// </summary>
/// <param name="picture">图片对象</param>
/// <param name="targetSize">图片大小</param>
/// <param name="showDefaultPicture">是否显示默认图像</param>
/// <param name="defaultPictureType">D默认图片类型</param>
/// <returns>图片路径</returns>
public virtual string GetPictureUrl(Picture picture,
int targetSize = 0,
bool showDefaultPicture = true,
PictureType defaultPictureType = PictureType.Entity)
{
string url = string.Empty;
byte[] pictureBinary = null;
if (picture != null)
{
pictureBinary = LoadPictureFromFile(picture.Id, picture.MimeType);
}
if (picture == null || pictureBinary == null || pictureBinary.Length == 0)
{
if(showDefaultPicture)
{
url = GetDefaultPictureUrl(targetSize, defaultPictureType);
}
return url;
}
string lastPart = GetFileExtensionFromMimeType(picture.MimeType);
string thumbFileName;
if (picture.IsNew)
{
DeletePictureThumbs(picture);
//we do not validate picture binary here to ensure that no exception ("Parameter is not valid") will be thrown
picture = UpdatePicture(picture.Id,
pictureBinary,
picture.MimeType,
picture.SeoFilename,
false,
false);
}
lock (s_lock)
{
string seoFileName = picture.SeoFilename; // = GetPictureSeName(picture.SeoFilename); //just for sure
if (targetSize == 0)
{
thumbFileName = !String.IsNullOrEmpty(seoFileName) ?
string.Format("{0}_{1}.{2}", picture.Id.ToString("0000000"), seoFileName, lastPart) :
string.Format("{0}.{1}", picture.Id.ToString("0000000"), lastPart);
var thumbFilePath = GetThumbLocalPath(thumbFileName);
if (!File.Exists(thumbFilePath))
{
File.WriteAllBytes(thumbFilePath, pictureBinary);
}
}
else
{
thumbFileName = !String.IsNullOrEmpty(seoFileName) ?
string.Format("{0}_{1}_{2}.{3}", picture.Id.ToString("0000000"), seoFileName, targetSize, lastPart) :
string.Format("{0}_{1}.{2}", picture.Id.ToString("0000000"), targetSize, lastPart);
var thumbFilePath = GetThumbLocalPath(thumbFileName);
if (!File.Exists(thumbFilePath))
{
using (var stream = new MemoryStream(pictureBinary))
{
Bitmap b = null;
try
{
//try-catch to ensure that picture binary is really OK. Otherwise, we can get "Parameter is not valid" exception if binary is corrupted for some reasons
b = new Bitmap(stream);
}
catch (ArgumentException exc)
{
//_logger.Error(string.Format("Error generating picture thumb. ID={0}", picture.Id), exc);
}
if (b == null)
{
//bitmap could not be loaded for some reasons
return url;
}
var newSize = CalculateDimensions(b.Size, targetSize);
var destStream = new MemoryStream();
ImageBuilder.Current.Build(b, destStream, new ResizeSettings()
{
Width = newSize.Width,
Height = newSize.Height,
Scale = ScaleMode.Both,
//Quality = _mediaSettings.DefaultImageQuality
});
var destBinary = destStream.ToArray();
File.WriteAllBytes(thumbFilePath, destBinary);
b.Dispose();
}
}
}
}
url = GetThumbUrl(thumbFileName);
return url;
}
/// <summary>
/// 删除缩略图
/// </summary>
/// <param name="picture">图片对象</param>
protected virtual void DeletePictureThumbs(Picture picture)
{
string filter = string.Format("{0}*.*", picture.Id.ToString("0000000"));
var thumbDirectoryPath = _webHelper.MapPath("~/content/images/thumbs");
string[] currentFiles = System.IO.Directory.GetFiles(thumbDirectoryPath, filter, SearchOption.AllDirectories);
foreach (string currentFileName in currentFiles)
{
var thumbFilePath = GetThumbLocalPath(currentFileName);
File.Delete(thumbFilePath);
}
}
/// <summary>
/// 删除图片
/// </summary>
/// <param name="picture">图片对象</param>
protected virtual void DeletePictureOnFileSystem(Picture picture)
{
if (picture == null)
throw new ArgumentNullException("picture");
string lastPart = GetFileExtensionFromMimeType(picture.MimeType);
string fileName = string.Format("{0}_0.{1}", picture.Id.ToString("0000000"), lastPart);
string filePath = GetPictureLocalPath(fileName);
if (File.Exists(filePath))
{
File.Delete(filePath);
}
}