/// <summary>
/// 获取Pool预览图
/// </summary>
/// <param name="previewInfoList">预览信息列表</param>
/// <returns></returns>
public static List <PoolPreviewInfo> GetPreviewImage(List <PoolPreviewInfo> previewInfoList)
{
//按md5首位分类
var md5LookUp = previewInfoList.Select(a => a.file_md5).ToLookup(b => b.Substring(0, 1));
//多线程查询结果集
IEnumerable <KeyValuePair <string, byte[]> > result = new Dictionary <string, byte[]>();
//根据查询图站数量创建线程
Task <Dictionary <string, byte[]> >[] tasks = new Task <Dictionary <string, byte[]> > [md5LookUp.Count];
int x = 0;
foreach (var md5Group in md5LookUp)
{
tasks[x] = new Task <Dictionary <string, byte[]> >(p =>
{
return(GetPreviewImageByGroup((IGrouping <string, string>)p));
}, md5Group);
x++;
}
//开启多线程查询
foreach (var t in tasks)
{
t.Start();
}
Task.WaitAll(tasks);
//合并多线程结果集
foreach (var t in tasks)
{
result = result.Concat(t.Result);
}
return(PoolPreviewInfo.AddPreview(previewInfoList, result.ToDictionary(k => k.Key, v => v.Value)));
}
