如何从服务器上的文件创建位图 - 参数无效

Question

HttpRequest req = new HttpRequest(imageName, "http://panonest.com", "");
var imgSrc=req.MapPath("~/view/vacantapredeal/vacantapredeal.jpg");
Bitmap img = new Bitmap(imgSrc);

我该怎么做？ 我得到一个参数是无效的异常，它是由Bitmap构造函数抛出的。

Answer 1

这是另一种方法：

  WebClient MyWebClient = new WebClient();
    byte[] BytesImage = MyWebClient.DownloadData("http://www.google.com/intl/en_com/images/srpr/logo3w.png");
    System.IO.MemoryStream iStream= new System.IO.MemoryStream(BytesImage);
    System.Drawing.Bitmap b = new System.Drawing.Bitmap(iStream);

祝好运！

Answer 2

如果您只是从本地服务器加载图像，则可以使用System.Drawing.Image轻松完成：

System.Drawing.Bitmap bmp =
    new System.Drawing.Bitmap(System.Drawing.Image.FromFile(
        MapPath("~/view/vacantapredeal/vacantapredeal.jpg")));

Answer 3

如果这是远程服务器上的映像，则根据MSDN ，您需要执行以下操作：

System.Net.WebRequest request = System.Net.WebRequest.Create("http://panonest.com" + imageName);
System.Net.WebResponse response = request.GetResponse();
System.IO.Stream responseStream = response.GetResponseStream();

Bitmap bitmap2 = new Bitmap(responseStream);
bitmap2.Save("~/view/vacantapredeal/vacantapredeal.jpg");