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dictionary of hashsets

Posted on 2010-08-30
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Last Modified: 2012-06-22
I have a dictionary of hashsets. I need a method search through a dictionary of hashsets to find a match.
Something like below code
public bool IsMatch(string lookup, Dictionary d)
{
 bool match;
 for each (hashet x in Dictionary.Keys)
 {
if (lookup match(x.key))
{return match;}
 }
}
But I'm not exactly sure how of the syntax of accessing the dictionary's keys & values.
My dictionary initialization in the main method looks like this:
Dictionary<string, HashSet<string>> l = new Dictionary<string, HashSet<string>>();
and it's populated already when I want to call this method
IsMatch("yada")

public bool IsMatch(string lookup, Dictionary d)
{
 bool match;
 for each (hashet x in Dictionary.Keys)
 {
if (lookup match(x.key))
{return match;}
 }
}

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Question by:mielcita
  • 4
6 Comments
 
LVL 75

Expert Comment

by:käµfm³d 👽
ID: 33563116
Is "yada" a key in the dictionary or a value in one of the Hashsets?
0
 
LVL 8

Expert Comment

by:Gururaj Badam
ID: 33566274
try this

if(l.ContainsKey(_key))
return l[_key);

return null;

If this is not what you're expecting, brief what the method is suppose to look for and return what.
0
 

Author Comment

by:mielcita
ID: 33570722
Novice,
Thanks, I tried that, and it does not return any values.

Kaufmed,
"yada" is a string I'm trying to match.
For testing purposes I'm using a string that is included in one of the hashsets.
But
l.ContainsKey("yada")
or
l.ContainsKey(_key)  //where _key is a string in one hashset

still returns null.
0
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LVL 75

Assisted Solution

by:käµfm³d 👽
käµfm³d   👽 earned 250 total points
ID: 33571552
If "yada" is a value in one of the HashSets, then you would search like this:
Dictionary<string, HashSet<string>> l = new Dictionary<string, HashSet<string>>();
bool found;

foreach (var item in l)
{
    if (item.Value.Contains("yada"))
    {
        found = true;
        break;
    }
}

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Accepted Solution

by:
käµfm³d   👽 earned 250 total points
ID: 33571563
Note:

I used "var" as a shortcut because it's easier to write than what I'm about to show you. You could also have done:
Dictionary<string, HashSet<string>> l = new Dictionary<string, HashSet<string>>();
bool found;

foreach (KeyValuePair<string, HashSet<string>> item in l)
{
    if (item.Value.Contains("yada"))
    {
        found = true;
        break;
    }
}

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LVL 75

Expert Comment

by:käµfm³d 👽
ID: 33571749
You could also have done this with LINQ or lambdas:
// LINQ
var result = from item in l
             where item.Value.Contains("yadda")
             select item;

bool found = result.Count() > 0;

// Lambda

var result = l.Values.FirstOrDefault(item => item.Contains("yadda"));

bool found = (result != null);

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