What is new without type in C#?

Question

What is new without type in C#?

I met the following code at work:

throw new("some string goes here");

Is the new("some string goes here") a way to create strings in C# or is it something else?

Answer 1

In the specific case of throw<\/code> , throw new()<\/code> is a shorthand for throw new Exception()<\/code> . The feature was introduced in c# 9 and you can find the documentation as Target-typed new expressions<\/a> .

private readonly Dictionary<SomeVeryLongName, List<AnotherTooLongName>> _data = new();

Answer 2

The new() creates an object of a type that can be inferred from context .

So instead of:

throw new System.Exception("hi");

you can use this abbreviated form instead:

throw new ("hi");

Similarly,

var s = new string("hello");

can be replaced with:

string s = new("hello");

Answer 3

The new()<\/code> creates an object of a type that can be inferred from context.

throw new System.Exception("hi");