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Editorial Team
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Asked: 2026-05-27T13:40:33+00:00

Problem I freshly installed mono on OS X Lion, compiled and ran my first-ever

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Problem

I freshly installed mono on OS X Lion, compiled and ran my first-ever csharp “hello world”, and then attempted a web request…

But I’m missing HttpUtility.

gmcs GoogleExample.cs -r:System.Web.Services -r:System.Web 
GoogleExample.cs(14,32): error CS0103: The name `HttpUtility' does not exist in the current context
Compilation failed: 1 error(s), 0 warnings

What to do?

History

I code C, NodeJS, Python, Ruby, etc. No noob to programming, just to mono.

I just installed mono (MRE Runtime, MDK, and MonoDevelop) on OS X via these instructions: http://www.go-mono.com/mono-downloads/download.html

Then I went off to play hello world with these instructions:
http://www.mono-project.com/Mono_Basics

And now I want to create a web request following this tutorial:
http://www.codeproject.com/KB/cross-platform/introtomono1.aspx?msg=3229009

End Goal:
Naturally, I want to create a JSON-based chat server as my first csharp project.

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1 Answer

  1. Editorial Team

    Apparently google couldn’t find it either, so they wrote there own api-compatible version:

    Here’s a workaround:

    1. Compile Google’s version as a library

      wget 'http://google-gdata.googlecode.com/svn/trunk/clients/cs/src/core/HttpUtility.cs'
gmcs -t:library HttpUtility.cs

    2. Edit GoogleExample.cs to include that namespace

      using Google.GData.Client; // where HttpUtility lives

    3. Recompile using the library

      gmcs GoogleExample.cs -r:System.Web.Services -r:System.Web -r:HttpUtility

    Side Note: the RegEx (or perhaps URL) in the example GoogleExample.cs is out of date, so it never returns results, but at least it compiles and runs.

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