Adding an optional dictionary parameter [duplicate]

Question

How to add an optional dictionary type parameter to any method.

I want to add a new optional parameter Dictionary to an existing method. I want to know if we could do this and if we could how could i default it to an empty dictionary of that type or null

You cannot provide a non-constant default-param. Thus you have to check for null within your method and assign an empty dictionary in that case as @Rahul mentioned — MakePeaceGreatAgain
– MakePeaceGreatAgain, Commented Oct 7, 2015 at 13:23

Rahul Tripathi · Accepted Answer · 2015-10-07 13:22:43Z

7

You can try like this:

void myFun(Dictionary<string, string> param = null)
{
    if(param == null) 
    param = new Dictionary<string,string>();
}

answered Oct 7, 2015 at 13:22

Rahul Tripathi

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1 Comment

Andy Braham Over a year ago

In newer versions, if you use <Nullable>enable</Nullable> the optional parameter needs to be defined as nullable Dictionary<string, string>? param = null

VERYNET · Accepted Answer · 2015-10-07 13:28:51Z

2

 void Foo(Dictionary<string, string> parameter){
        if(parameter == null) parameter = new Dictionary<string,string>();
    }

You could also make the parameter optional:

void Foo(Dictionary<string, string> parameter = null)
{
    if(parameter == null) parameter = new Dictionary<string,string>();
}

edited Oct 7, 2015 at 13:28

answered Oct 7, 2015 at 13:24

VERYNET

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