ASP.NET Download Image file from URL with querystring

Question

I'm trying to download an image from a URL. The URL has a security key appended to the end and I keep getting the following error: System.Net.WebException: An exception occurred during a WebClient request. ---> System.ArgumentException: Illegal characters in path

I'm not sure the correct syntax to use for this. Here is my code below.

string remoteImgPath = "https://mysource.com/2012-08-01/Images/front/y/123456789.jpg?api_key=RgTYUSXe7783u45sRR";
string fileName = Path.GetFileName(remoteImgPath);
string localPath = AppDomain.CurrentDomain.BaseDirectory + "LocalFolder\\Images\\Originals\\" + fileName;
WebClient webClient = new WebClient();
webClient.DownloadFile(remoteImgPath, localPath);
return localPath;

I don't think Path.GetFileName does what you think it does. — Brian Driscoll
– Brian Driscoll, Commented Jan 18, 2012 at 19:37
it returns the file name and extension of the specified path string Ah, I wasn't even looking there. I need to split the file so it's not grabbing the query string in the local file path. — user204588
– user204588, Commented Jan 18, 2012 at 19:39
Brian, that was it. Man, I had when you miss something so obvious. You want to put your answer and I'll mark it? — user204588
– user204588, Commented Jan 18, 2012 at 19:45

Brian Driscoll · Accepted Answer · 2012-01-18 19:45:08Z

8

I think that this is what you're looking for:

string remoteImgPath = "https://mysource.com/2012-08-01/Images/front/y/123456789.jpg?api_key=RgTYUSXe7783u45sRR";
Uri remoteImgPathUri = new Uri(remoteImgPath);
string remoteImgPathWithoutQuery = remoteImgPathUri.GetLeftPart(UriPartial.Path);
string fileName = Path.GetFileName(remoteImgPathWithoutQuery);
string localPath = AppDomain.CurrentDomain.BaseDirectory + "LocalFolder\\Images\\Originals\\" + fileName;
WebClient webClient = new WebClient();
webClient.DownloadFile(remoteImgPath, localPath);
return localPath;

answered Jan 18, 2012 at 19:45

Brian Driscoll

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1 Comment

Rohan Rao Over a year ago

In my case, I am getting exception saying "The given path's format is not supported.". What to do ?

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