CODEWITHSUNDEEP
c#listcompiler-errors
Jedediah
Jedediah

Reputation: 1944

Why is List not being resolved by visual studio here?

I'm afraid I'm a little new to C#, so I simply copied some code from his documentation. This is using the MailChimp Amazon Simple Email Service API

var api = new SesApi(yourMailChimpKey);
var result = api.SendEmail("Subject for test email",
     "<p>Body of HTML email</p>",
     "Body of plain text email",
     new EmailAddress("Sender name", "[email protected]"),
     new List { new EmailAddress("Recipient", "[email protected]") },
     tags: new List { "test" } //Problems are on this line, and the one above it
);

The problem is that visual studio (I'm using .net 4.5) doesn't seem to be able to resolve the sections where is says "new List {...}"

Am I missing a library, or is there a newer way to do this that I've missed?

Upvotes: 1

Views: 681

Answers (3)

svick
svick

Reputation: 244777

The problem is that there is no type List. There is only the generic List<T>, which is most likely what the documentation meant to use. (The non-generic version is ArrayList, but you really shouldn't use that.)

This means you need to specify the type of the list in your code:

 new List<EmailAddress> { new EmailAddress(…) }
 new List<string> { "test" }

(This assumes you have using System.Collections.Generic; at the top of your code file.)

Assuming the API accepts any collection, simpler solution might be to use an array:

 new[] { new EmailAddress(…) }
 new[] { "test" }

Upvotes: 2

Bob Mc
Bob Mc

Reputation: 2008

I think you've got a couple of issues.

First, you need a using System.Collections.Generic; directive at the top of your file, as noted by Moshe.

Then, try putting parentheses after your list declaration, like this example:

private void Form1_Load( object sender, EventArgs e )
{
    ListParam( new List<string>() { "Item 1", "Item 2" } );
}

private void ListParam( List<string> mylist )
{
    MessageBox.Show( "List count = " + mylist.Count );
}

Upvotes: 0

Moshe
Moshe

Reputation: 2668

Notice there's a difference between "using System.Collections" to "using System.Collections.Generics". The later requires that you specify the list type, such as "new List<EmailAddress> { new EmailAddress ... }"

Upvotes: 1

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