F# how to return have value a tuple or null

Posted by mamu on Stack Overflow See other posts from Stack Overflow or by mamu
Published on 2010-06-06T05:44:32Z Indexed on 2010/06/06 5:52 UTC
Read the original article Hit count: 227

Filed under:

F#

    let retVal =
      if reader.Read() then
        (reader.GetString(0), getBytesData reader 1, reader.GetDateTime(2))
      else
        null

F# don't allow null to returned

How can i have value return as a tuple or a null?

Related posts about F#

FSharp.Core.sigdata not found alongside FSharp.Core

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm trying to use F# for an ASP.NET MVC application. One my controller actions sends an F# list to the view, so I write: <%@ Page Language="C#" Inherits="ViewPage<FSharpList<int>>" %> Of course, for this to work, I have to add Microsoft.FSharp.Collections to the namespaces element… >>> More
F# Powerpack's Metadata doesn't recognize FSharp.Core as an F# library

as seen on Stack Overflow - Search for 'Stack Overflow'
Here's my test code to isolate the problem: open Microsoft.FSharp.Metadata [<EntryPoint>] let main args = let core = FSharpAssembly.FromFile @"C:\Program Files\FSharp-2.0.0.0\\bin\FSharp.Core.dll" let core2 = FSharpAssembly.FSharpLibrary let core3 = System.AppDomain.CurrentDomain.GetAssemblies()… >>> More
Nasty mono bug with F#

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I have this monstrous f# 2.0 program My mono version is Mono JIT compiler version 2.9 (master/f593354 Sun Dec 26 03:15:55 EET 2010) Copyright (C) 2002-2010 Novell, Inc and Contributors. www.mono-project.com TLS: __thread SIGSEGV: altstack Notifications: epoll Architecture:… >>> More
Could not load file or assembly FSharp.Core, Version=4.0.0.0

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm trying to deploy a web application which uses F# 4.0 on Windows Server 2008. It works on my computer where VS2010 is installed but it doesn't work on the server. Everytime you open the page you'll get this error message: Could not load file or assembly 'FSharp.Core, Version=4.0.0.0, Culture=neutral… >>> More
FSharp.Compiler.CodeDom for VS2008 and VS2010 side-by-side

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm using FSharp.Compiler.CodeDom to dynamically create F# classes. The problem is, that I have both VS2008 and VS2010 on my computer side-by-side (they works fine), and using F# in this configuration is buggy at best: If I don't install InstallFSharp.msi, then under VS2008 the built classes complain… >>> More

Developer IT

F# how to return have value a tuple or null - Developer IT

F# how to return have value a tuple or null

F#

Related posts about F#

FSharp.Core.sigdata not found alongside FSharp.Core

F# Powerpack's Metadata doesn't recognize FSharp.Core as an F# library

Nasty mono bug with F#

Could not load file or assembly FSharp.Core, Version=4.0.0.0

FSharp.Compiler.CodeDom for VS2008 and VS2010 side-by-side

Categories cloud