C# cast to anonymous type

venil7

consider the following code:

Expand|Select|Wrap|Line Numbers

 var test1 = new { field1 = "hello" };

ArrayList al = new ArrayList();

al.Add(test1);
 
//compile error

Console.WriteLine(al[0].field1);

an anonymous type is created than placed into ArrayList.
al[0] obviously returns Object, how to cast this back to anonymous type to retrieve value of 'field1'?

tlhintoq

just guessing but have you tried...

(var)al[0].field1

or

var Recovered = (var)al[0];
Console.WriteLine(Recovered.field1);

venil7

ok, I found the answer:

first we need an Extension class:

Expand|Select|Wrap|Line Numbers

 static class Extension

    {

        static public T CastTo<T>(this object o, T t)

        {

            return (T)o;

        }

    }

which will add CastTo method to all Objects, then

Expand|Select|Wrap|Line Numbers

 var v = al[0];

Console.WriteLine(v.CastTo(new { field1=String.Empty}).field1);

the trick is to pass an anonymous object to CastTo which has same signature as the one that we put to ArrayList

Plater

Why did you need to do all that work instead of just type-casting?

C# cast to anonymous type

re: C# cast to anonymous type

re: C# cast to anonymous type

re: C# cast to anonymous type

Similar .NET Framework bytes

/bytes/development

/bytes/it

/bytes/about