A local or parameter cannot be declared in this scope

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i'm working on a project and I can't seem to figure out why i'm getting this error. here is the full error

A local or parameter named 'waterAmount' cannot be declared in this scope because that name is used in an enclosing local scope to define a local or parameter

and here is the code

public void WaterMethod()
	{
		int waterAmount;

		Console.WriteLine("In ounces, enter the amount of water that will be put in.");
		waterAmount = int.Parse(Console.ReadLine());

		if (waterAmount => 42)
		{

		}
	}

Thanks in advance for any help

What I have tried:

looking up questions about this error on sites like this

Posted 7-Mar-20 10:47am

Member 14637431

Updated 7-Mar-20 12:34pm

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Jon McKee · Answer 1 · 2020-03-07T12:35:00

"=>" defines a lambda expression. You want ">=" which is a comparison operator (greater than or equal to). By making a lambda you're re-defining waterAmount.

EDIT:
For a more detailed explanation of what's going on, a lambda can capture it's enclosing scope's variables. One side effect of this is that symbols (like waterAmount) can not be duplicated between the lambda's scope and enclosing scope. For instance, how would you resolve the following:

C#

int waterAmount;
Func<int, int> lambda = waterAmount => waterAmount * waterAmount;

Which waterAmount does the lambda's code refer to? The parameter twice, the local twice, or a mix?

This also applies to local/nested functions (functions defined in functions).

For more: The Beauty of Closures[^]

Patrice T · Answer 2 · 2020-03-07T11:04:00

Solution 1

Quote:
A local or parameter named 'waterAmount' cannot be declared in this scope because that name is used in an enclosing local scope

Impossible to answer this as you removed the offending part of your code.
Update your question with completed code.

Posted 7-Mar-20 11:04am

Patrice T