C# string to list

Question

I am really new to C# and am trying to troubleshoot a test of some code that uses Amazon SES to send email.

    [TestMethod()]
    public void SendEmailTest()
    {
        SESEmailProvider target = new SESEmailProvider();

        string ToEmailAddresses = "[email protected]";
        string FromEmailAddress = "[email protected]";
        string Subject = "Test";
        string EmailBody = "Hello world.";
        string expected = string.Empty;
        string actual;
        actual = target.SendEmail(ToEmailAddresses, FromEmailAddress, Subject, EmailBody);
        Assert.AreEqual(expected, actual);
        Assert.Inconclusive("Verify the correctness of this test method.");
    }

The error message in Visual Studio is:

string SESEmailProvider.SendEmail(
 System.Collections.Generic.List<string> ToEmailAddresses,
 string FromEmailAddress, string Subject, string EmailBody)

Error:

 The best overloaded method match for 'MyServices.SESEmailProvider.SendEmail(
   System.Collections.Generic.List<string>, string, string, string)'
  has some invalid arguements.

I think the issue is that it's expecting ToEmailAddresses to be a list, not a single string, but I'm struggling to find a way to convert/handle this.

Thanks!

Jason · Accepted Answer · 2011-10-29 02:51:39Z

4

well you've defined the variable ToEmailAddresses as a string, but you want it to be a list.

there are many ways to define and fill a list, but the most compact is:

var toEmailAddresses = new List<string> { "[email protected]" }

the above creates a new list, and initializes it with a single string "[email protected]"

answered Oct 29, 2011 at 2:51

Jason

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2 Comments

Jason Over a year ago

note that you can initialize the list with multiple values by comma separating them e.g. .....{ "item1", "item2", "item3" }

Matt Over a year ago

Thanks - this worked perfectly. I'll accept the answer as soon as the wait time is up. Thanks again!

bryanmac · Accepted Answer · 2011-10-29 02:51:16Z

2

SendMail expects a List as it's first argument - not a string.

So, do:

List<String> toAddresses = new List<String>();
toAddresses.Add("[email protected]");

pass toAddresses as the first arg

The clue was in the error message. It expects List, string, string, string

The best overloaded method match for 'MyServices.SESEmailProvider.SendEmail(
System.Collections.Generic.List, string, string, string)'
has some invalid arguements.

answered Oct 29, 2011 at 2:51

bryanmac

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Comments

user596075 · Accepted Answer · 2011-10-29 02:51:57Z

1

[TestMethod()] 
public void SendEmailTest() 
{ 
    SESEmailProvider target = new SESEmailProvider(); 

    List<string> ToEmailAddresses = new List<string>() {"[email protected]"}; 
    string FromEmailAddress = "[email protected]"; 
    string Subject = "Test"; 
    string EmailBody = "Hello world."; 
    string expected = string.Empty; 
    string actual; 
    actual = target.SendEmail(ToEmailAddresses, FromEmailAddress, Subject, EmailBody); 
    Assert.AreEqual(expected, actual); 
    Assert.Inconclusive("Verify the correctness of this test method."); 
}

Try that. I have changed your variable from a string to a List<string>.

answered Oct 29, 2011 at 2:51

user596075

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