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Hello all,

I am facing a problem on a windows web service. Although I havent made any changes on my code, lately I ve been receiving this error. What I am trying to do is connecting to a web service and make a call and get a responce. So if i can get a responce I have a XML written to a string. But now it fails and goes directly to my catch statement.

The weird thing is, I can access the XML when I put the URL to the browser.

In addition to that;
in order to make a call I am using a IDictionary.
the code goes like that;

IDictionary<string, string> r3 = new Dictionary<string, String>();
            r3["Service"] = "ECommerceService";
            r3["Operation"] = "ItemLookup";
            r3["ItemId"] = asin;
            r3["MerchantId"] = "Featured";
            r3["ResponseGroup"] = "Medium,OfferFull,Reviews";

string urlReq = HttpUtility.UrlDecode(r3.Values.ToString());
            requestUrl = helper.Sign(urlReq);

This doesnt work because on the request url it apeears as;

- http://onca/xml?AccessKeyId=0JB3Q7C8ZC0YD8WE7BG2&System.Collections.Generic.Dictionary`2[System.String,System.String]=&Timestamp=2011-02-14T19:00:13Z

On the link here "

" there should be values.

The correct must be ;


So instead of "

" i need this there"


In order to get that how can I get it from IDictionary like that can someone help? I am open to new ideas as well?

What I am thinking but cant figure out yet; I tried

string urlReq = "";
            foreach (string url in r3.Values)
                urlReq = r3[url] + "&";
            urlReq = urlReq.Substring(0, urlReq.Length - 1);
            urlReq = HttpUtility.UrlDecode(urlReq);

But this foreach is faulty. what is the proper way for it? I hope I am clear.


1 solution

Try this:

IDictionary<string, string> r3 = new Dictionary<string, string>();
r3["Service"] = "ECommerceService";
r3["Operation"] = "ItemLookup";
r3["ItemId"] = "asin";
r3["MerchantId"] = "Featured";
r3["ResponseGroup"] = "Medium,OfferFull,Reviews";

var urlString = String.Join(string.Empty, r3.Select(it => String.Format("&{0}={1}", it.Key, it.Value)));

urlString will now be: &Service=ECommerceService&Operation=ItemLookup&ItemId=asin&MerchantId=Featured&ResponseGroup=Medium,OfferFull,Reviews
Orcun Iyigun 14-Feb-11 16:11pm
well I am having an error as;
Error 2 Argument '2': cannot convert from 'System.Collections.Generic.IEnumerable<string>' to 'string[]'.

How can I fix this?
Nish Nishant 14-Feb-11 16:13pm
Okay, what version of .NET are you on? The overload I used is .NET 4/Silverlight only.
Nish Nishant 14-Feb-11 16:14pm
Try this:

var urlString = String.Join(string.Empty, r3.Select(it => String.Format("&{0}={1}", it.Key, it.Value)).ToArray());

That should work with .NET 3.5 which is what I think you are on.
Orcun Iyigun 14-Feb-11 16:25pm
Nish Nishant 14-Feb-11 16:26pm
I hope that worked.
Manfred Rudolf Bihy 14-Feb-11 16:29pm
Good answer and follow up! 5+
Nish Nishant 14-Feb-11 16:33pm

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