CSharpScript.EvaluateAsync未识别enum

Question

我使用CSharpScript.EvaluateAsync从字符串生成谓词。使用字符串和int变量可以很好地工作，但是如果我试图传入字符串中的enum变量以进行转换，则会引发错误：

消息"(1,26)：error CS0103:当前上下文中不存在名称‘CS0103’“字符串

以下是独立复制：

using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.CodeAnalysis.CSharp.Scripting;
using Microsoft.CodeAnalysis.Scripting;

namespace PredicateParser
{
    class Program
    {
        static void Main(string[] args)
        {
            var albums = new List<Album>
            {
                new Album { Quantity = 10, Artist = "Betontod", Title = "Revolution", Status = Status.Offline},
                new Album { Quantity = 50, Artist = "The Dangerous Summer", Title = "The Dangerous Summer", Status = Status.Offline },
                new Album { Quantity = 200, Artist = "Depeche Mode", Title = "Spirit", Status = Status.Online },
            };


            var albumFilter1 = "album => album.Quantity > 20 && album.Quantity < 200"; //works fine
            var albumFilter2 = "album => album.Status == Status.Online"; //Throws exception

            var predicate1 = CreatePredicate<Album>(albumFilter1);
            var predicate2 = CreatePredicate<Album>(albumFilter2);

            var filteredAlbums1 = albums.Where(predicate1).ToList();
            var filteredAlbums2 = albums.Where(predicate2).ToList();

        }

        public static Func<T, bool> CreatePredicate<T>(string command)
        {
            var options = ScriptOptions.Default.AddReferences(typeof(T).Assembly);
            Func<T, bool> predicate = CSharpScript.EvaluateAsync<Func<T, bool>>(command, options).Result;

            return predicate;
        }

    }



    public class Album
    {
        public int Quantity { get; set; }
        public string Title { get; set; }
        public string Artist { get; set; }
        public Status Status { get; set; }
    }

    public enum Status
    {
        Online,
        Offline
    }
    
}

我怎么才能让它和枚举一起工作呢？

Answer 1

var options = ScriptOptions.Default.AddReferences(typeof(T).Assembly).AddImports(nameof(PredicateParser));

忘记添加“使用命名空间”:)

Answer 2

在本例中，如果完全使用命名空间对其进行限定，则不会出现错误。

"album => album.Status == PredicateParser.Status.Online"