我们如何通过 MVC 和 C# 中的 Uri 从其他网站获取图像 byte[]?

How we can get image byte[] from other website by Uri in MVC and C#?

如果我们有这样的 Uri:

 uri = new Uri(info.ImageAddress);

图片地址有这个地址:

http://www.pictofigo.com/assets/uploads/pictures/0/3466/thumb-vacation-pictofigo-hi-005.png

如何在mvc中获取图像数据?

这篇answer to the question How to download image from url using c#应该能帮到你。

您可以使用Image.FromStream加载任何类型的常用位图(jpg、png、bmp、gif、...),它会自动检测文件类型,您甚至不需要检查url 扩展(这不是一个很好的做法)。例如:

using (WebClient webClient = new WebClient()) 
{
    byte [] data = webClient.DownloadData("https://fbcdn-sphotos-h-a.akamaihd.net/hphotos-ak-xpf1/v/t34.0-12/10555140_10201501435212873_1318258071_n.jpg?oh=97ebc03895b7acee9aebbde7d6b002bf&oe=53C9ABB0&__gda__=1405685729_110e04e71d9");

   using (MemoryStream mem = new MemoryStream(data)) 
   {
       using (var yourImage = Image.FromStream(mem)) 
       { 
          // If you want it as Png
           yourImage.Save("path_to_your_file.png", ImageFormat.Png) ; 

          // If you want it as Jpeg
           yourImage.Save("path_to_your_file.jpg", ImageFormat.Jpeg) ; 
       }
   } 

}

您需要使用类似 HttpClient 调用的方法并将文件流式传输回文件流,然后可用于将文件保存到 http 响应或直接保存到磁盘:

using (var httpClient = new HttpClient())
{
    using (var request = new HttpRequestMessage(HttpMethod.Get, requestUri))
    {
        using (
            Stream contentStream = await(await httpClient.SendAsync(request)).Content.ReadAsStreamAsync(),
            stream = new FileStream("MyImage", FileMode.Create, FileAccess.Write, FileShare.None, Constants.LargeBufferSize, true))
        {
            await contentStream.CopyToAsync(stream);
        }
    }
}

这当然是一个异步调用,因为它可能是一个大文件。