patterncsharpCritical

A generic list of anonymous class

Submitted by: @import:stackoverflow-api·Mar 10, 2026·

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genericlistanonymousclass

Problem

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 list = new List();
list.Add(o);
list.Add(o1);

Another Example:

List list = new List();

while (....)
{
    ....
    list.Add(new {Id = x, Name = y});
    ....
}

Solution

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 CreateList(params T[] elements)
{
     return new List(elements);
}

var list = CreateList(o, o1);

You get the idea :)

Code Snippets

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

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

var list = CreateList(o, o1);

Context

Stack Overflow Q#612689, score: 496

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