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Jayne Spooner
Jayne Spooner

Total Post:21

Posted on    December-09-2015 12:21 AM

 .NET C#  .NET  String  list 

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I'm trying to get List of strings from my dynamic object list and it keeps saying that:

Error 1 Cannot implicitly convert type 'System.Collections.Generic.List<dynamic>' to 'System.Collections.Generic.List<string>'
I'm selecting a property and use .ToString() on it:

var objects = new List<dynamic>();
//filling objects here

List<string> things = objects.Select(x => x.nameref.ToString()).ToList();
So isn't it a valid List of strings? Why compiler is assuming that this list is of type dynamic?

I've tried also converting from this answer, but it keeps giving me same error.

Anyone knows how to make it List<string>?

Why isn't it working? Because you can make mess like this:

public class Test
    public int ToString()
        return 0;
and compiler won't know if ToString returns string or int.

Mayank Tripathi
Mayank Tripathi

Total Post:397

Posted on    December-09-2015 12:33 AM

You need to cast the items, like so:

List<string> things = objects.Select(x => x.nameref.ToString()).Cast<string>().ToList();
The reason why it's not recognizing that ToString() returns a string is that it's called on a dynamic object, and the method binding is done at runtime, not compile time.

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