CODEWITHSUNDEEP
c#linq
ankur
ankur

Reputation: 4733

Check if String contains the key

There is a string that has the following key value pair. It is being Seperated by "," So after splitting it by.

 string[] strSubject = certificate.Subject.Split(',');

            [0] "[email protected]" 
        [1] " CN=Ankur" 
        [2] " OU=Telco" 
        [3] " O=aol"    
        [4] " L=Mum"    
        [5] " S=Mh"
        [6] " C=IN"

the value is a combination of key value pair, With key name fixed. The problem is it is not mandatory to have all the keys for all objects . what it meant is for some object it will have some values, for Example

            [0] "[email protected]" 
        [1] " CN=Ankur" 
        [2] " S=Mh"
        [3] " C=IN"

So I cant hard code the Index and fetch the value by doing some thing like this

String value = strSubject[5].Replace("S=",string.Empty));

I have tried using .contains too like this

if (strSubject.Contains("C="))//Don't Know the value part as it is dynamic
   {
//this does not work
   }

How can I get the values of the keys that are present after splitting . Can Linq query fetch the value not sure about it.

Upvotes: 3

Views: 3237

Answers (9)

EventHorizon
EventHorizon

Reputation: 2986

Parsing distinguished names can be challenging. I suggest you consider Hall72215's answer here, or this project on code project for a solution in managed code.

The accepted answer by faester will break if you have RDNs with the same name which is quite common for distinguished names. For example this certificate from Verisign:

OU = NO LIABILITY ACCEPTED, (c)97 VeriSign, Inc., OU = VeriSign Time Stamping Service, Root OU = VeriSign, Inc., O = VeriSign Trust Network

Here you have two occurences of OU, and one of the OU values contains a comma which will also break the code.

Upvotes: 0

faester
faester

Reputation: 15086

Create a dictionary and query that:

var testStr = "E=foo,B=Bar,O=aol,FAIL";

var dict = testStr.Split(',').Where(x => x.Contains("="))
   .Select(x => x.Trim().Split('=')).ToDictionary(x => x[0], x=> x[1]);

dict.ContainsKey("theKey");

(This also gives you a convenient way of handle the queries.)

Upvotes: 2

svick
svick

Reputation: 244878

What you should do is to parse the string into something like Dictionary<string, string>, it will be much easier to work with that.

Something like (assuming the space after , is required):

var subjectDictionary = certificate.Subject
    .Split(new[] { ", " }, StringSplitOptions.None)
    .Select(pair => pair.Split('='))
    .ToDictionary(pair => pair[0], pair => pair[1])

if (subjectDictionary.ContainsKey("C"))
{
   var valueForC = subjectDictionary["C"];
   …
}

Upvotes: 2

Abbas
Abbas

Reputation: 14432

To get the values just use this line of code:

var values = strSubject.Select(v => v.Split('=')[1]);

And for key and value:

var values = strSubject.Select(v => new { Key = v.Split('=')[0], Value = v.Split('=')[1] });

Upvotes: 0

Csaba Benko
Csaba Benko

Reputation: 1161

I am not sure what exactly is your aim, but what if you do a Split again with '=' as a separator:

string[] strParts = theValue.Split("=");

Than you have the key and the value in strParts[0] and strParts[1] respectively.

Upvotes: 0

walther
walther

Reputation: 13600

I guess something like this should work.. 

string[] strSubject = certificate.Subject.Split(',');
for (int i = 0; i < strSubject.Length; i++)
{
   string[] row = strSubject[i].Split('=');

   switch (row[0]) // the key
   {
        case "E": 
            // do something, value is stored in row[1]
            break;
        case "CN":
            // do something else
            break;
        //... cover the expected keys
   }
}

Upvotes: 1

Alessandro D&#39;Andria
Alessandro D&#39;Andria

Reputation: 8868

Try get all the key and values:

var q = certificate.Subject.Split(',')
    .Select(x => x.Trim())
    .Select(x => new
    {
        key = x.Substring(0, x.IndexOf('=')).Trim(),
        value = x.Substring(x.IndexOf('=') + 1).Trim()
    });

then:

foreach (var x in q)
{
    if (x.key == "C")
    {
        // code
    }
}

Upvotes: 0

huMpty duMpty
huMpty duMpty

Reputation: 14470

for(var i=0;i<strSubject.Length;i++)
{
      if(strSubject[i].Trim().StartsWith("C="))
      {
               //perform your action
      }
}

Upvotes: 0

tigerswithguitars
tigerswithguitars

Reputation: 2547

I like to use the yourWord.IndexOf(inputString) != 0

So using System.Linq

var match = yourWords.ToList().FirstOrDefault(x => x.ToLower().IndexOf(inputString) != 0);

But there are loads of ways of other ways doing this. Pick your fave!

Upvotes: 0

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