How to specify parameter from multiple optional parameters

Question

I have a method that takes one dynamically typed (probably not relevant) parameter and multiple optional parameters of more than one type. Is there any way to specify which parameters you are passing?

With this code I am getting compiler errors (below), and I wold like not to have to write overloads or rewrite the function with multiple orders for the optional parameters.

Error 2 Argument 3: cannot convert from 'string' to 'bool'
Error 1 The best overloaded method match for Index(int, bool, bool, string)' has some invalid arguments

Code:

public void DoSomeWork()
{
    Index<int>(Id, false,"test"); //compiler error 
}

private void Index<T>(T o, bool flush = false, bool userDispose = true, string starter = "stop")
{

}

Kevin Brechbühl · Accepted Answer · 2014-01-08 20:24:34Z

6

You can mark optional parameters with the name followed by a double point. In your example:

public void DoSomeWork()
{
    Index<int>(Id, false, starter: "test");
}

This means that Id and false names the first two parameters o and flush, the third parameter userDispose is not set and the parameter starter is set with test.

For more informations about named and optional parameters, have a look at the MSDN.

answered Jan 8, 2014 at 20:24

Kevin Brechbühl

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2 Comments

cubitouch Over a year ago

Interresting, I didn't know that !

DROP TABLE users Over a year ago

Thanks, exactly what I was looking for (will mark as answer as soon as it lets me).

Selman Genç · Accepted Answer · 2014-01-08 20:25:22Z

3

Use named arguments, which is one of the great features of C#.

 Index<int>(Id, flush: false, starter: "test");

answered Jan 8, 2014 at 20:25

Selman Genç

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