Can Roslyn generate source code from an object instance?

问题

Using the Roslyn API with Visual Studio 2015, can I convert an object instance to source code? Can I create an extension method like ".ToSourceCode()" as shown below?

class Foo { }
class Program
{
    static string classSourceCode = "class Foo { }";
    static void Main()
    {
        var instance = new Foo();
        var instanceSourceCode = instance.GetType().ToSourceCode();
        System.Diagnostics.Debug.Assert(instanceSourceCode == classSourceCode);
    }
}

回答1:

No. However, ILSpy can.

Based on the comments on the question and what I understand about Roslyn, decompilation is not supported. However, thanks to @Bradley's ILSpy tip, there is a solution:

1. Download the ILSpy binaries from http://ilspy.net/
2. Reference the following assemblies: ICSharpCode.Decompiler.dll, ILSpy.exe, Mono.Cecil.dll, ILSpy.BamlDecompiler.Plugin.dll
3. Implement the ".ToSourceCode()" extension method as shown below:

using System;
using System.Linq;
using System.Reflection;
using System.Text.RegularExpressions;
using ICSharpCode.Decompiler;
using ICSharpCode.ILSpy;
using Mono.Cecil;
class Foo { }
class Program
{
    static string classSourceCode = "using System; internal class Foo { } ";
    static void Main()
    {
        var instance = new Foo();
        var instanceSourceCode = instance.GetType().ToSourceCode();
        System.Diagnostics.Debug.Assert(instanceSourceCode == classSourceCode);
    }
}

static class TypeExtensions
{
    public static string ToSourceCode(this Type source)
    {
        var assembly = AssemblyDefinition.ReadAssembly(Assembly.GetExecutingAssembly().Location);
        var type = assembly.MainModule.Types.FirstOrDefault(t => t.FullName == source.FullName);
        if (type == null) return string.Empty;
        var plainTextOutput = new PlainTextOutput();
        var decompiler = new CSharpLanguage();
        decompiler.DecompileType(type, plainTextOutput, new DecompilationOptions());
        return Regex.Replace(Regex.Replace(plainTextOutput.ToString(), @"\n|\r", " "), @"\s+", " ");
    }
}

来源：https://stackoverflow.com/questions/29567489/can-roslyn-generate-source-code-from-an-object-instance