C#•9mo ago

C# Dictionary question

Hi, if i have a dictionary in C# defined like so: Dictionary<string, List<int>> test; and I do List<int> stringValue = test["string"]; is the resulting variable "stringValue" a copy of test["string"] or the actual list ???

3 Replies

Angius•9mo ago

A list is a reference type, so a reference to that list We can easily check that, though

MODiX•9mo ago

Angius

REPL Result: Success

var dict = new Dictionary<string, List<int>>(){
    ["key"] = [ 1, 2, 3, 4, 5 ]
};

var list = dict["key"];
list.Add(17);

dict["key"]

var dict = new Dictionary<string, List<int>>(){
    ["key"] = [ 1, 2, 3, 4, 5 ]
};

var list = dict["key"];
list.Add(17);

dict["key"]

Result: List<int>

[
  1,
  2,
  3,
  4,
  5,
  17
]

[
  1,
  2,
  3,
  4,
  5,
  17
]

Compile: 350.837ms | Execution: 32.600ms | React with ❌ to remove this embed.

fifty ShucksOP•9mo ago

thank you

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C# Dictionary question