CODEWITHSUNDEEP
c#.net
Nilesh Moradiya
Nilesh Moradiya

Reputation: 721

Difference between define dictionary

i am developing application using C#(5.0).Net(4.5). I want to know whats the difference between below to declaration of dictionary variable. 1.

var emailtemplateValues = new Dictionary<string, object>
    {
        {"CreatorName", creatorUserInfo.UserName},
        {"ProjectName", masterProjectInfo.Title},
        {"Reason",  reason}
    };

and 2.

var emailtemplateValues = new Dictionary<string, object>()
    {
        {"CreatorName", creatorUserInfo.UserName},
        {"ProjectName", masterProjectInfo.Title},
        {"Reason",  reason}
    };

in 2nd declaration i have used () after Dictionary<string, object>. both syntax works fine but just eager to know about internal work.

Upvotes: 5

Views: 100

Answers (4)

Subhash Jakhar
Subhash Jakhar

Reputation: 172

There are no difference after the processed by compiler the output is same code.

Upvotes: 1

JaredPar
JaredPar

Reputation: 754763

These two syntaxes are equivalent. When a constructor call is omitted from the initializer expression then the compiler will attempt to bind to the parameterless constructor an that type. This is covered in section 7.5.10.1 of the C# spec

An object creation expression can omit the constructor argument list and enclosing parentheses provided it includes an object initializer or collection initializer. Omitting the constructor argument list and enclosing parentheses is equivalent to specifying an empty argument list.

Upvotes: 9

Tobia Zambon
Tobia Zambon

Reputation: 7629

No difference here, the first one is simply a syntactic sugar for the second.

Upvotes: 5

p.s.w.g
p.s.w.g

Reputation: 149020

Nothing. When using the initializer syntax, you may omit the the parentheses. This is equivalent to invoking the parameterless constructor. They will produce exactly the same byte-code when compiled.

Upvotes: 5

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