Dynamically create properties in anonymous type

Question

I want to create a new type using anonymous types.

This is my code:

 var t = paramaterList.Select(x => x).ToArray().Select(item => new
             {
                 item,
             });

I need to create properties for var t based on the name of item.

For example:

if paramaterList.Select(x => x).ToArray() contained 3 items: FirstName, Surname, Age

This should create properties for each of those items:

paramaterList.Select(x => x).ToArray().Select(item => new
             {

             });

How are you going to consume `t` if you don't know its properties at compile time? — Sergey Berezovskiy, Feb 23 '17 at 20:42
You want too much. You know that anonymous types are compiler generated, right? Which means the answer is no, you can't do that. — Ivan Stoev, Feb 23 '17 at 20:43
Are you really looking for `dynamic` and http://stackoverflow.com/questions/1653046/what-are-the-true-benefits-of-expandoobject? — Alexei Levenkov, Feb 23 '17 at 21:04

score 0 · Answer 1 · answered Feb 23 '17 at 20:44

0

Anonymous types are still statically typed, even though they don't have a name that you can use to refer to them by. If you don't know the fields that this object is going to have at compile time, then you can't create a variable of an anonymous type to hold that data. You'll need to store the data in some form of data structure, such as a dictionary, that doesn't require you to know what the values are at compile time.

answered Feb 23 '17 at 20:44

Servy

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You can create Expression which builds anonymous type depending on properties in source type – Sergey Berezovskiy Feb 23 '17 at 20:45
Is there any way to achieve this? Even if I do not use anonymous types – John Feb 23 '17 at 20:46
@SergeyBerezovskiy But then you could never have a variable of that type. – Servy Feb 23 '17 at 20:47
@John Sure, store the data in a `Dictionary`, like I said in the answer. – Servy Feb 23 '17 at 20:47
@John You can find hundreds of thousands of examples with a quick Google search. – Servy Feb 23 '17 at 20:49
There is a SO question [how to list all...](http://stackoverflow.com/questions/6536163/how-to-list-all-variables-of-class) and also use [anonymous type](https://msdn.microsoft.com/en-us/library/bb397696.aspx) – Felix Castor Feb 23 '17 at 20:51

Dynamically create properties in anonymous type

1 Answers1