C# – Check if key exists in Dictionary

This short post shows two (2) ways on how to check if a key exists in Dictionary. Dictionary is something similar to Map in Java.

Requirements

Stuffs used for this post.

  • SharpDevelop 5.1.0
  • .NET 4.6

Dictionary.ContainsKey(TKey)

.NET also has Generics similar to Java. The parameter TKey has T which means Generic type.

Outputs

Dictionary. TryGetValue(TKey, out TValue)

This method takes two (2) parameters. Again the parameter names are prefixed with T meaning they are of Generic Types.

This method is a bit special. The TValue must be preceded with out as the variable will be modified within TryGetValue and gets reflected on the valueFromMap1 and valueFromMap2.

Outputs