Cast to Anonymous Type
The question is how to cast an object to an anonymous type. Anonymous types are created using object initializers and are often used as a convenient way to store data. However, they do not have a type name, which can make it difficult to cast them.
One way to cast an object to an anonymous type is to use a trick that involves using a dummy value of the desired anonymous type. This dummy value is used to infer the type of the object to be cast. Here is an example:
public class Program { public static void Main(string[] args) { var a = new { Id = 1, Name = "Bob" }; TestMethod(a); } private static void TestMethod(object x) { // This is a dummy value, just to get 'a' to be of the right type var a = new { Id = 0, Name = "" }; a = Cast(a, x); Console.WriteLine(a.Id + ": " + a.Name); } private static T Cast<t>(T typeHolder, object x) { // typeHolder above is just for compiler magic // to infer the type to cast x to return (T)x; } }</t>
Another way to cast an object to an anonymous type is to use a generic extension method. This method can be used to cast an object to any anonymous type. Here is an example:
public static class AnonymousTypeExtensions { public static T CastTo<t>(this object value, T targetType) { // targetType above is just for compiler magic // to infer the type to cast value to return (T)value; } } public class Program { public static void Main(string[] args) { var a = new { Id = 1, Name = "Bob" }; var b = a.CastTo(new { Id = 0, Name = "" }); Console.WriteLine(b.Id + ": " + b.Name); } }</t>
However, it is important to note that using anonymous types in this way can be tricky and is not recommended in general. It is better to use a real type instead.
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