C# .net casting question

.net, c#

Solution

Because `Cast()` doesn't deal with user-specified casts - only reference conversions (i.e. the normal sort of conversion of a reference up or down the inheritance hierarchy) and boxing/unboxing conversions. It's not the same as what a cast will do in source code. Unfortunately this isn't clearly documented :(

EDIT: Just to bring Jason's comment into the post, you can work around this easily with a projection:

IEnumerable<string> results = originalList.Select(x => (string) x);

Problem

I'm a bit confused about the following. Given this class: ``` public class SomeClassToBeCasted { public static implicit operator string(SomeClassToBeCasted rightSide) { return rightSide.ToString(); } } ``` Why is an InvalidCastException thrown when I try to do the following? ``` IList<SomeClassToBeCasted> someClassToBeCastedList = new List<SomeClassToBeCasted> {new SomeClassToBeCasted()}; IEnumerable<string> results = someClassToBeCastedList.Cast<string>(); foreach (var item in results) { Console.WriteLine(item.GetType()); } ```

Original source