Convert list to int array in C#

Question

I have searched through StackOverflow and Google for the conversion, but unfortunately I was unable to get the solution. Everything was the opposite of what I wanted. i.e., Conversion of an int[] to List.

Problem

I have this code in my [WebMethod].

[WebMethod]
public int MyMethodWS(int N, List<int> M)
{
}

And now I have a Console Application, that references this service by using this URL:

http://localhost:61090/MyMethod.asmx?WSDL

I have this code in my Console Application:

int N;
List<int> M = new List<int>();
// Some crazy user input coding.
// Ultimately you will have non-empty M list and N int.
MyMethod.MyMethodWS DA = new MyMethod.MyMethodWS();
Sum = DA.MyMethodWS(N, M);

When I run this code, I am getting this error:

#1: The best overloaded method match for 'MyMethod.MyMethod.MyMethodWS(int, int[])' has some invalid arguments.

#2: Argument 2: cannot convert from 'System.Collections.Generic.List<int>' to 'int[]'

Questions

I have used only List there. But why is it trying to convert as int[]?
Currently the WebService as well as Console Application, both run in the same Solution. Is it a problem? Should I use different solutions, or different instances of Visual Studio 2012 altogether?

score 2 · Accepted Answer · 2013-10-27 12:43:42Z

2

It is trying to convert it to int[], because MyMethodWS takes a int[] as a parameter, instead of List<int> that you are trying to pass it. To convert a List<int> to int[], call List<T>.ToArray();

So change the line Sum = DA.MyMethodWS(N, M); to Sum = DA.MyMethodWS(N, M.ToArray());

edited Oct 27, 2013 at 12:43

answered Oct 27, 2013 at 12:38

user925777

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8 Comments

Jeroen Vannevel Over a year ago

What makes you say it takes an int[] parameter? Could you explain why this is the case, even though it's defined as List<int>?

user925777 Over a year ago

@JeroenVannevel Actually I'm a bit confused now too. I think originally the method that Praveen was trying to call was named DivisorSumWS or something, and not that MyMethodWS which clearly takes a List<int> as a parameter. However, that error message clearly states that the method takes int[] as a parameter... I'm not quite sure whats going on, maybe Praveen changed the original post or I read it incorrectly to begin with.

Praveen Kumar Purushothaman Over a year ago

@JaakkoLipsanen Please update your answer. Yes, I changed it because well, it is the code from my production, which I am not supposed to put. :)

Praveen Kumar Purushothaman Over a year ago

The thing is, I have declared as List<int>, but it expects in int[]. But your solution worked removing the errors, but VS 2012 Crashed.

user925777 Over a year ago

@PraveenKumar Do you still have a problem or error in your code? Because based on the edited code from your question, it should work jus fine. If it's still not working, try to clean&rebuild and if even that doesn't help, post more information so that we can help you.

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