Earlier quoted context omitted.
Could you be clearer about what you mean, since string is a sealed type in C#, so what exactly do you mean T1 and T2 of string?
A record wrapping a string, indicating what the string represents, so you can't mix it up with a different thing also represented by a string.
Yes, you can have two different record types which both wrap a string value.
As a (bad) trivial example, you could wrap reading a file in this kind of monstrosity:
var fileResult = Helpers.ReadFile(@"c:\temp\test.txt");
Console.WriteLine("Extracted:");
Console.WriteLine(Helpers.ExtractString(fileResult));
public record FileRead(string value);
public record FileError(string value);
public union FileResult(FileError, FileRead);
public static class Helpers
{
public static FileResult ReadFile(string fileName)
{
try
{
var fileResult = System.IO.File.ReadAllText(fileName);
return new FileRead(fileResult);
}
catch (Exception ex)
{
return new FileError(ex.Message);
}
}
public static string ExtractString(FileResult result)
{
return result switch
{
FileError err => $"An Error occured: {err.value}",
FileRead content => content.value,
_ => throw new NotImplementedException()
};
}
}
It's more useful implemented a level deeper, so that the exception is never raised and caught, because exceptions aren't particularly cheap in .NET.