Roslyn: 是一个.NET 编译平台，支持C#, Nuget 包：Microsoft.CodeAnalysis.CSharp.dll.

C#动态编译代码，快速上手，代码如下：如题所示，报这个错误的解决办法：

var assemblies = AppDomain.CurrentDomain.GetAssemblies().Where(s => !s.IsDynamic && !string.IsNullOrEmpty(s.Location));

项目

public string Execute(string code){try{string id = "demo1";var assemblies = AppDomain.CurrentDomain.GetAssemblies().Where(s => !s.IsDynamic && !string.IsNullOrEmpty(s.Location));var refs = assemblies.Select(x => MetadataReference.CreateFromFile(x.Location));var compilation = CSharpCompilation.Create($"{id}.dll").WithOptions(new CSharpCompilationOptions(Microsoft.CodeAnalysis.OutputKind.DynamicallyLinkedLibrary,usings: null,optimizationLevel: OptimizationLevel.Release,checkOverflow: false,allowUnsafe: true,platform: Platform.AnyCpu,warningLevel: 4,xmlReferenceResolver: null)).AddReferences(refs).AddSyntaxTrees(CSharpSyntaxTree.ParseText(code));using (var ms = new MemoryStream()){var result = compilation.Emit(ms);if (result.Success){ms.Seek(0, SeekOrigin.Begin);var assembly = Assembly.Load(ms.ToArray());var invokeType = assembly.GetTypes().First(x => x.Name == "CSCode");var dynamicType = Activator.CreateInstance(invokeType);return (string)invokeType.GetMethod("Execute").Invoke(dynamicType, new object[] {  new MyClass(){ Id="1111"} });}var error = new StringBuilder();foreach (var t in result.Diagnostics){error.AppendLine($"{t.GetMessage()}");}return error.ToString();}}catch (Exception ex){return ex.Message;}}

准备的待编译class文件代码如下：

using Newtonsoft.Json;
namespace DynamicExpresso.Services
{public class CSCode{class MsgInfo{public string Id { get; set; }public string DisplayCode { get; set; }public string DisplayName { get; set; }}public string Execute(MyClass classObj){// 获取对象, 测试MsgInfo msgInfo = JsonConvert.DeserializeObject<MsgInfo>(classObj.Demo);string redisKey = msgInfo.Id;//访问Redis测试bool redisResult = RedisHelper.Set(redisKey, "hello,world#!@#", 1000);string result = RedisHelper.Get(redisKey);//访问数据库测试var dataBaseRepo = new RepositoryBase<MyClass>();var collections=  dataBaseRepo.Query(x => x.Id == "123");return JsonConvert.SerializeObject(collections);}}
}

实际测试：动态代码编译后，并非同所在工程隔离，且是利用了所在项目工程的上下文运行时环境，处于同一个AppDomain中（注意命名空间保持一致） 。