A generic list of anonymous class


Question

In C# 3.0 you can create anonymous class with the following syntax

var o = new { Id = 1, Name = "Foo" };

Is there a way to add these anonymous class to a generic list?

Example:

var o = new { Id = 1, Name = "Foo" };
var o1 = new { Id = 2, Name = "Bar" };

List<var> list = new List<var>();
list.Add(o);
list.Add(o1);

Another Example:

List<var> list = new List<var>();

while (....)
{
    ....
    list.Add(new {Id = x, Name = y});
    ....
}
1
388
9/6/2013 8:39:49 PM

Accepted Answer

You could do:

var list = new[] { o, o1 }.ToList();

There are lots of ways of skinning this cat, but basically they'll all use type inference somewhere - which means you've got to be calling a generic method (possibly as an extension method). Another example might be:

public static List<T> CreateList<T>(params T[] elements)
{
     return new List<T>(elements);
}

var list = CreateList(o, o1);

You get the idea :)

403
3/4/2009 10:12:18 PM

Here is the answer.

string result = String.Empty;

var list = new[]
{ 
    new { Number = 10, Name = "Smith" },
    new { Number = 10, Name = "John" } 
}.ToList();

foreach (var item in list)
{
    result += String.Format("Name={0}, Number={1}\n", item.Name, item.Number);
}

MessageBox.Show(result);

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