从 url 下载图像

Question

I've to download the images from particular URL using, for loop in case some products having more than 5 images.. when i click the product button some of the images only getting download not all images..but when i debug the corresponding code works fine, ie, its downloads all the images..properly. is this due to some cache.... or image file is in Gif format....

This is My Code

for (int i = 0; i < obj.Count; i++)
{
PartNAme = (obj[i].ToString().Split('='))[1];
_prtnm = PartNAme.ToString().Split(';')[0];

//this is url , source for the image
_final_URI = _URI + _Prod_name + '/' + _prtnm + ".GIF";


WebClient client = new WebClient();

string strtempname = DateTime.Now.ToString().Replace("/", "").Replace(":", "").Replace(" ", "");

rnd = new Random(100);

string _strfile = "PNImage" + strtempname + rnd.Next().ToString() + ".gif";

string _path = "../Images/PNImage/" + _strfile;

string _PPath = Server.MapPath(_path);

//to download image from source url, and path to save the image file
client.DownloadFile(_final_URI, _PPath);
}

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in above code when i debug the image files are getting downloaded properly, but while running without debug some image files gets repeated so instead of getting original image file, old/same image file gets downloaded instead... is this due to some cache.... or image file is in Gif format....

Answer 1

I think that random gives you the same number. See this thread for a fix Random number generator only generating one random number

If you debug you are way "slower" that without debugging. Another option would be to use guids as filename