如何从url下载图像使用c# [英] How to download image from url using c#
本文介绍了如何从url下载图像使用c#的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
如果网址在链接的末尾没有图像格式,是否有直接从c#中的网址下载图像?网址示例:
Is there a way to download an image directly from a url in c# if the url does not have an image format at the end of the link? Example of url:
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_110e04e71d969d392b63b27ec4f4b24a
当URL以图像格式结束时,我知道如何下载图像。例如:
I know how to download the image when the url ends with an image format. Eg:
http://img1.wikia.nocookie.net/__cb20101219155130/uncyclopedia/images/7/70/Facebooklogin.png
推荐答案
简单
您可以使用以下方法。
Simply You can use following methods.
using (WebClient client = new WebClient())
{
client.DownloadFile(new Uri(url), @"c:\temp\image35.png");
//OR
client.DownloadFileAsync(new Uri(url), @"c:\temp\image35.png");
}
这些方法与DownloadString(..)和DownloadStringAsync )。他们将文件存储在Directory中,而不是C#字符串,URI中不需要格式扩展名。
如果您不知道格式(.png,.jpeg等)的图像
These methods are almost same as DownloadString(..) and DownloadStringAsync(...). They store the file in Directory rather than in C# string and no need of Format extension in URi
public void SaveImage(string filename, ImageFormat format) {
WebClient client = new WebClient();
Stream stream = client.OpenRead(imageUrl);
Bitmap bitmap; bitmap = new Bitmap(stream);
if (bitmap != null)
bitmap.Save(filename, format);
stream.Flush();
stream.Close();
client.Dispose();
}
使用它
Using it
try{
SaveImage("--- Any Image Path ---", ImageFormat.Png)
}catch(ExternalException)
{
//Something is wrong with Format -- Maybe required Format is not
// applicable here
}
catch(ArgumentNullException)
{
//Something wrong with Stream
}
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