Parse string to different variables c#

Question

I've got a string fdf=232232&lid=19974832&number=1&aa_result1_1=someId1&aa_resuuuuuult2_2=someId2&aa_resuuuult3_3=someId3

and if aa exists I need to take values and add them to dictionary like:

var dict =  extendedIds.Add("result1", new Dictionary<string, int[]>()
   {
      {
           "someId1",
           new int[]{ 1 }
      }, ...
   });

however I am having a difficult time deciding how to parse it properly? I need to accept multiple aa values (the ones that come as resultN, someIdN and a number (which is the number after resultN_NUMBER).

I tried to use substring but that doesn't work as I dont't now the length of word result

Basically it is var parameters = $"pam=805700&laaid=19974832&kpm=1&{HttpUtility.UrlEncode("aa_{result}_{number}={id}&aa_{result}_{number}={id}&aa_{result}_{number}={id}", Encoding.UTF8)}";

So I decode it and get string: var decoded = input.ToString().UrlDecode();

I need to accept multiple aa values, so in this example there would be three values, two of them comes from in bertween _ one after = but I wonder how to take these values then there could be something else also split by _...

also I could var parsed = HttpUtility.ParseQueryString(decoded); parse to NameValueCollection. but I can't use parsed.GetValues("aa") because the key would be e.g. aa_result1_1 and I never know beforehand what it is

I mean I changed these values now for an example, in real life result will be some kind of url, aa will be different string but it will be same everywhere — user122222
– user122222, Commented Mar 17, 2021 at 7:26
Can you explain the rules by which you go from your input string to your dictionary? Would a Split on _ help? — Hans Keﬆing
– Hans Keﬆing, Commented Mar 17, 2021 at 7:28

Keith Nicholas · Accepted Answer · 2021-03-17 07:12:10Z

4

this is a query string, you can use HttpUtility.ParseQueryString to parse it

see

https://learn.microsoft.com/en-us/dotnet/api/system.web.httputility.parsequerystring?view=net-5.0

answered Mar 17, 2021 at 7:12

Keith Nicholas

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Hans Keﬆing · Accepted Answer · 2021-03-17 10:06:06Z

Would this set you on the right track?

var qs = "fdf=232232&lid=19974832&number=1&aa_result1_1=someId1&aa_resuuuuuult2_2=someId2&aa_resuuuult3_3=someId3";
var nvc = System.Web.HttpUtility.ParseQueryString(qs);
foreach (var key in nvc.AllKeys.Where(k => k.StartsWith("aa")))
{
    var id = nvc[key];
    var parts = key.Split('_');
    var result = parts[1];
    var number = parts[2];
    
    Console.WriteLine($"result = '{result}', number = '{number}' => id = '{id}'");
}

Use ParseQueryString to convert your string into a NameValueCollection.
Then use each key that starts with "aa"
Get its value - this is your "id"
Split the key on the _
Ignore the first part (which would be "aa") and use the next two parts

Of course you would want to add some safety: I now assume that there always are 3 parts in that key. Plus you want to do something useful with the results.

The above code prints this

result = 'result1', number = '1' => id = 'someId1'
result = 'resuuuuuult2', number = '2' => id = 'someId2'
result = 'resuuuult3', number = '3' => id = 'someId3'

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