Question

I have an issue with string manipulation in c#. Please check the follwoing expression :

public static string UNID =  ((Thread.CurrentPrincipal as ClaimsPrincipal).Identity as ClaimsIdentity)
.Claims.Single(c => c.ClaimType.Contains("nameidentifier")).Value.Substring( //issue is here

I want to point the value in the substring function for applying the indexOf function on it. I tried this keyword but not working :

public static string UNID =  ((Thread.CurrentPrincipal as ClaimsPrincipal).Identity as ClaimsIdentity)
.Claims.Single(c => c.ClaimType.Contains("nameidentifier")).Value.Substring(this.IndexOf('/') + 1);

I know that we can do the same thing by breaking the expression into parts like :

var value = ((Thread.CurrentPrincipal as ClaimsPrincipal).Identity as ClaimsIdentity)
.Claims.Single(c => c.ClaimType.Contains("nameidentifier")).Value;

var UNID = value.Substring(value.IndexOf('/') + 1);

But if there is any solution for this just like i was trying with this keyword. Then please let me know ?

Answer 1

This should work:

public static string UNID =  ((Thread.CurrentPrincipal as ClaimsPrincipal).Identity as ClaimsIdentity).Claims
  .Where(c => c.ClaimType.Contains("nameidentifier"))
  .Select(c => c.Value.Substring(c.Value.IndexOf('/')+1))
  .Single();

• first select the requested claimtype
• then convert that to the correct value-substring
• and take the only (expected) value