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How To Host Mono’s CSharp Compiler as a Service in .NET - For Runtime Code Evaluation/REPL

| Sunday, October 10, 2010
 Anders in his C# Futures Talk mentioned about C# Compiler as a Service and demonstrated an REPL (Read Evaluation Print Loop) implementation.
If this is going to be a part of C#/.NET framework, this will allow you to execute plain C# code strings during runtime. This will allow you to implement features like interactive scripting in your applications.

  As of now, .NET/C# stack don’t have this. Enter Mono’s C# Compiler as a service implementation. Big Bang. Last April, Miguel announced the availability of Mono’s C# Compiler as a Service assembly, along with a neat REPL C# shell. From that point onwards, I was thinking about writing a quick post on some of my thoughts about hosting Mono’s assembly in your .NET applications, so here we go.

1 – Download the C# Shell and Mono.CSharp.dll assembly
A snapshot of the C# REPL shell and Mono.CSharp.dll is available from this direct link (From Miguel’s post). The Zip contains a C# REPL shell - csharp.exe – and also the Mono.CSharp.dll which is the Compiler as Service assembly that we may use to host the C# compiler in our .NET apps.

2 – Exploring Miguel’s C# REPL Shell
For now, fire up csharp.exe. Once you fire up the shell, type help; to get a list of Static methods available for meta purposes like showing the defined local variables (ShowVars), loading an assembly so that you can use the types inside the same (LoadAssembly) etc.

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