Roslyn:从元模型创建程序集

Question

在我投入大量时间学习 roslyn 编译器服务之前，我想问一下 roslyn 是否可以实现以下场景。是否可以编译程序集而无需将任何内容写入磁盘并执行它？我基于元模型生成完整的解决方案，我想采用它并编译并执行它。罗斯林有可能吗？

Answer 1

这是一个稍微轻一点的版本:

// Some standard references most projects use
var references = new List<MetadataReference>
{
    MetadataReference.CreateAssemblyReference("mscorlib"),
    MetadataReference.CreateAssemblyReference("System"),
    MetadataReference.CreateAssemblyReference("System.Linq"),
    new MetadataFileReference(this.GetType().Assembly.Location)
};

// The MyClassInAString is where your code goes
var syntaxTree = SyntaxTree.ParseText(MyClassInAString);

// Use Roslyn to compile the code into a DLL
var compiledCode = Compilation.Create(
    "MyAssemblyName",
    options: new CompilationOptions(OutputKind.DynamicallyLinkedLibrary),
    syntaxTrees: syntaxTree,
    references: references;
    );

// Now read the code into a memory stream. You can then load types out of the assembly with reflection
Assembly assembly;
using (var stream = new MemoryStream())
{
    EmitResult compileResult = compiledCode.Emit(stream);
    if (!compileResult.Success)
    {
        throw new InvalidOperationException("The assembly could not be built, there are {0} diagnostic messages.".FormatWith(compileResult.Diagnostics.Count()));
    }
    assembly = Assembly.Load(stream.GetBuffer());
}