What's the return type of an anonymous class

Question

I have a class that used to have a string return type. Now I find I need to return more than a string. I was thinking to return something like below:

public          


        

Answer 1

The object that you return does have a class, but it's anonymous so you can't specify it in the code. You just have to return it as an object reference:

public object Test() {
  return new { ID = 5, Name= "Dave" };
}

Note that the anonymous type is unknown outside the scope of the method, so reflection is the only way to access its properties.

If you want to be able to use the returned object conveniently, you should declare a class:

public class TestResult
{
    public int ID { get; set; }
    public string Name { get; set; }
}

public TestResult Test() {
    return new TestResult() { ID = 5, Name= "Dave" };
}

Another alternative is to use an existing class, if it fits your purpose. A KeyValuePair is close to what you use, but then the properties will of course be named Key and Value instead of ID and Name:

public KeyValuePair Test() {
  return new KeyValuePair(5, "Dave");
}