c# - 如何在最终用户预览中使用 Roslyn 执行脚本

Question

我正在尝试使用 roslyn 的最终用户预览，并想执行一个简单的脚本。我想做的是:

static void Main(string[] args)
{
    // Is this even valid?
    var myScript = "int x = 5; int y = 6; x + y;";

    // What should I do here?
    var compiledScript = Something.Compile(myScript);
    var result = compiledScript.Execute(myScript);


    Console.WriteLine(result);
}

有人可以指出一些资源和/或告诉我要安装哪些 nuget 包来实现这一点。我已经安装了 Microsoft.CodeAnalysis，但无法弄清楚它是否可行，我觉得我遗漏了什么。

Answer 1

在最新的预览版中(暂时)删除了允许您轻松执行此操作的脚本 API。您仍然可以编译脚本，发出并加载程序集并通过执行以下操作调用其入口点

public static class Program
{
    public static void Main(string[] args)
    {
        var assemblyPath = Path.GetDirectoryName(typeof(object).Assembly.Location);

        var defaultReferences = new[] { "mscorlib.dll", "System.dll", "System.Core.dll" };

        var script = @"using System;
        public static class Program
        {
            public static void Main(string[] args)
            {
                Console.WriteLine(""Hello {0}"", args[0]);
            }
        }";

        // Parse the script to a SyntaxTree
        var syntaxTree = CSharpSyntaxTree.ParseText(script);

        // Compile the SyntaxTree to a CSharpCompilation
        var compilation = CSharpCompilation.Create("Script",
            new[] { syntaxTree },
            defaultReferences.Select(x => new MetadataFileReference(Path.Combine(assemblyPath, x))),
            new CSharpCompilationOptions(OutputKind.ConsoleApplication));

        using (var outputStream = new MemoryStream())
        using (var pdbStream = new MemoryStream())
        {
            // Emit assembly to streams.
            var result = compilation.Emit(outputStream, pdbStream: pdbStream);
            if (!result.Success)
            {
                return;
            }

            // Load the emitted assembly.
            var assembly = Assembly.Load(outputStream.ToArray(), pdbStream.ToArray());

            // Invoke the entry point.
            assembly.EntryPoint.Invoke(null, new object[] { new[] { "Tomas" } });
        }
    }
}

它将在控制台输出Hello Tomas :)