/// <summary>
/// 将contentField字段内容，截取第一张图片或(图片|视频)存入headerField字段中,
/// 不指定字段参数时。会自动以ImgUri，DefaultHeader数据库标签为识别依据
/// </summary>
/// <param nickname="enity"></param>
/// <param nickname="contentFieldName">缺省为空，可强制指定</param>
/// <param nickname="thumbPath">/upload/thumb/</param>
/// <param nickname="imgFrom"></param>
/// <returns></returns>
public string BuildDefaultHeader(object enity, Boolean useThumb = true, string thumbPath = "/upload/thumb/", int thumbWidth = 120, int thumbHeight = 90, string contentFieldName = null, string headerFieldName = null, ImgUrlFrom imgFrom = ImgUrlFrom.Html)
{
string thumFile = "";
DbEntityEntry _entity = base.Entry(enity);
string _contentFieldName = contentFieldName;
string _headerFieldName = headerFieldName;
bool isModify = false;
if (_contentFieldName == null || _headerFieldName != null)
{
foreach (var f in _entity.Entity.GetType().GetProperties())
{
if (_contentFieldName == null)
{
var iuas = f.GetCustomAttributes(typeof(ImgUriAttribute), true);
if (iuas.Length > 0)
{
imgFrom = ((ImgUriAttribute)iuas[0]).From;
_contentFieldName = f.Name;
}
}
if (_headerFieldName == null)
{
var iuas = f.GetCustomAttributes(typeof(DefaultHeaderAttribute), true);
if (iuas.Length > 0)
{
_headerFieldName = f.Name;
}
}
}
}
//开始处理
if (_contentFieldName != null && _headerFieldName != null)
{
var xx = _entity.CurrentValues.GetValue <string>(_contentFieldName).GetHtmlImageUrlList().FirstOrDefault();
if (xx != null)
{
try
{
isModify = true;
if (useThumb)
{
string thumFullFileName = ImageHelper.BulidThum(
file: xx,
savePath: thumbPath,
width: thumbWidth,
height: thumbHeight
);
_entity.CurrentValues[_headerFieldName] = thumFullFileName;
}
else
{
_entity.CurrentValues[_headerFieldName] = xx;
}
}
catch (Exception e)
{
isModify = false;
}
}
}
if (isModify)
{
thumFile = _entity.CurrentValues[_headerFieldName].ToString();
this.SaveChanges();
}
return(thumFile);
}
/// <summary>
///
/// </summary>
/// <param nickname="fias">当不为空时，强制指定成员变量对应的ImgUriAttribute</param>
/// <param nickname="thumb">是否生成DefaultHeader:即缩略图</param>
/// <returns></returns>
public int SaveEx(FieldImgAtt[] fias = null, Boolean thumb = true)
{
IEnumerable <DbEntityEntry> entities = ChangeTracker.Entries().Where(e => e.State == EntityState.Added || e.State == EntityState.Modified || e.State == EntityState.Deleted); //.Select(e => e.Entity);
Dictionary <string[], ImgUrlFrom> tem = new Dictionary <string[], ImgUrlFrom>(); //将其做图片文件处理的字符串内容暂存在此
foreach (DbEntityEntry entity in entities)
{
foreach (var f in entity.Entity.GetType().GetProperties())
{
Boolean isTrue = false;
ImgUrlFrom imgFrom = ImgUrlFrom.Html;
if (fias != null)
{//强制指定时
var _fs = fias.Where(d => d.FiledName == f.Name);
if (_fs.Any())
{
isTrue = true;
imgFrom = _fs.ElementAt(0).ImgUrlFrom;
}
}
if (!isTrue)
{
var iuas = f.GetCustomAttributes(typeof(ImgUriAttribute), true);
if (iuas.Length > 0)
{//含有imgUri特性的字段
isTrue = true;
imgFrom = ((ImgUriAttribute)iuas[0]).From;
}
}
if (isTrue)
{
string origValue = entity.State == EntityState.Added ? "" : entity.GetDatabaseValues().GetValue <string>(f.Name);//取得数据库中原始值
string nowValue = entity.State == EntityState.Deleted ? "" : entity.CurrentValues.GetValue <string>(f.Name);
string newValue = UploadController.TransformUploadPath(nowValue);
if (origValue != nowValue)
{//如果与原值不一至，值可能含有upload_tem的上传img，
if (entity.State != EntityState.Deleted)
{
entity.CurrentValues[f.Name] = newValue;
}
//f.SetValue(entity.Entity, newValue);
tem.Add(new string[] { origValue, newValue, }, imgFrom);
}
}
}
}
var i = base.SaveChanges();
if (tem.Count > 0)
{
foreach (var s in tem)
{
if (s.Value == ImgUrlFrom.Url || s.Value == ImgUrlFrom.MultipleUrl)
{
UploadController.CompareUploadFileMoveAndDel(s.Key[0], s.Key[1]);
}
else
{
UploadController.CompareUploadHtmlImageMoveAndDel(s.Key[0], s.Key[1]);
}
}
}
return(i);
}
