C# 7.3 support?

PeterHamerton

Does linqpad have c# 7.3 support?

c# 7.3 added equality support for tuples (== and !=) and while the following code works in Visual Studio 15.7 Preview, its causes a compilation error in linqpad 5.31

`(1,1) == (1,2)`

`CS0019 Operator '==' cannot be applied to operands of type '(int, int)' and '(int, int)'`

JoeAlbahari

It does now

Download the new beta:
http://www.linqpad.net/download.aspx#beta

ARMPLINKER

This sample statement does not appear to work although LinqPad states 7.3 support:

var value = 2;

var result=  value switch
{

    1 => "Case 1",  
    2 => "Case 2",  
    3 => "Case 3",  
    4 => "Case 4",  
};

results in:

CS1002 ; expected

CS1003 Syntax error, '(' expected

CS1525 Invalid expression term '{'

CS1026 ) expected

I am sorry to be out of it, but these really simple examples should work, yes? Or do I need to set an option somewhere?

What I really want to do is this:

Replace all these if statements :

        **    if (e.Argument.StartsWith(@"DISCARD:INSPECTION"))
            {
                DiscardInspection();
            }

            if (e.Argument == @"ERROR")
            {
                Response.Redirect("~/Error.aspx");
            }

            if (e.Argument == @"EXPIRATION")
            {
                Log?.Debug("EditFormCS redirects to Expiration");
                Response.Redirect("~/Expiration.aspx");
            }**

with :

var action = e.Argument switch
{
e.ArgumentStartsWith(@"DISCARD:INSPECTION")) => DiscardInspection(),
e.Argument == @"ERROR" => Response.Redirect("~/Error.aspx"),
e.Argument == @"EXPIRATION" =>  {
                    Log?.Debug("EditFormCS redirects to Expiration");
                    Response.Redirect("~/Expiration.aspx");
                },
...
...
...
..

}

and then invoke the action...

Hopeless?

Thank you.

sgmoore

Works ok with LinqPad 6 beta, so I'm guessing you are using LinqPad 5.

JoeAlbahari

Switch expressions were introduced in C# 8, which requires .NET Core (and hence LINQPad 6).

mmooreNts

This is a few years old, but I am copying code directly from my .NetFrameWork (3.7.2) code into LinqPad 5, but I get an error for Invalid Expression Term in a Switch Statement. however, I get no error in VS and the code works. Am I missing a setting change in LinqPad5?

            switch (phonenumber.Length)
            {
                case > 6:
                    sb.Append($"{phonenumber.Substring(0, 3)}-{phonenumber.Substring(3, 4)}");
                    break;
                case <= 3:
                    sb.Append(phonenumber);
                    break;
                default:
                    sb.Append($"{phonenumber.Substring(0, 3)}-{phonenumber.Substring(3, phonenumber.Length - 3)}");
                    break;
            }

NetMage

The feature you are using (relational patterns) is part of C# 9. LINQPad 5 only supports up to C# 7.3 or 8 with experimental Roslyn features enabled. Are you using C# 9 but targeting .Net Framework 3.7.2?

mmooreNts

We are running a .Net 4.7.2, and we can not set the target language version, it is disabled and automatically set by the framework.

Again, this has been in our code for a while. (FYI, I mean 4.7.2 (type-o on my part..sorry)

mmooreNts

so, our projects are setup to use "LangVersion" of 9.