How to search / check the dictionary value by key

Question

I am trying to confirm if a particular dictionary key contains a value

eg.

does dict01 contains the phrase "testing" in the "tester" key

Right now I need to iterate over the dictionary with KeyPair, which I don't want to do, as it wastes performance

Answer 1

You can use ContainsKey and string.Contains :

var key = "tester"; var val = "testing"; if(myDictionary.ContainsKey(key) && myDictionary[key].Contains(val)) { // "tester" key exists and contains "testing" value } 

You can also use TryGetValue :

 var key = "tester"; var val = "testing"; var dicVal = string.Empty; if(myDictionary.TryGetValue(key, out dicVal) && dicVal.contains(val)) { // "tester" key exists and contains "testing" value } 

Answer 2

You can use the following method if you do not want to iterate through the dictionary twice

 string value; var result = dict01.TryGetValue("tester", out value) && value.Contains("testing"); 

Answer 3

 if (myDict.ContainsKey("tester")) // Do something? 

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