/// <summary>
/// 从联网下载图片
/// </summary>
/// <param name="url"></param>
/// <returns></returns>
public static async Task <ImageSource> FetchNetworkImage(string url)
{
var stream = await Task.Run(() => {
return(FileCacheHelper.Hit(url));
});
return(LoadImageStream(stream));
}
/// <summary>
/// 从网络上面下载图片，转换成 BitMapImage
/// </summary>
/// <param name="url">图片的 url 地址</param>
/// <param name="bufferSize">读取图片开辟的缓存大小，默认 512K</param>
/// <returns></returns>
public static async Task <ImageSource> FetchImage(string url)
{
if (CloudStorageHelper.IsCloudImage(url) && !FileCacheHelper.IsCached(url))
{
var storage = CloudStorageHelper.GetCloudStorage();
await storage.GetImage(url, FileCacheHelper.AppCacheDirectory, FileCacheHelper.BuildFileName(url));
}
var stream = FileCacheHelper.Hit(url);
return(LoadImageStream(stream));
}