问题：action中返回匿名对象时，swagger只能按强类型生成返回值描述
解决办法：使用roslyn在内存中动态执行代码，使用json.net反序列化匿名对象，向swagger返回动态匿名对象
效果：
Swaager在描述控制器的方法时，可以使用以下方法
<response code="400">如果id为空</response>
或
[ProducesResponseType(typeof(ResponseT<User>), 200)]
Openapi json如下
生成效果如下图
上述方法必须存在强类型user
代码
@@@code
[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = true, Inherited = true)]
public class AnonymousTypeProducesResponseTypeAttribute : Microsoft.AspNetCore.Mvc.ProducesResponseTypeAttribute
{
public AnonymousTypeProducesResponseTypeAttribute(string typeJson, int statusCode) : base(getAnonymousType(typeJson), statusCode)
{
}
/// <summary>
///
/// </summary>
/// <param>匿名类型描述串
/// </param>
/// <example>new {id=1,name=""}</example>
/// <param></param>
static System.Type getAnonymousType(string typeJson)
{
var code = @"
public class Result {
public System.Type GetType2(){
var t = Newtonsoft.Json.JsonConvert.DeserializeAnonymousType(""{}"", #T#);
return t.GetType();
}
}
".Replace("#T#", typeJson.Replace("'", @""""));
List<PortableExecutableReference> refList = new List<PortableExecutableReference>();
refList.Add(MetadataReference.CreateFromFile(typeof(object).Assembly.Location));
refList.Add(MetadataReference.CreateFromFile(typeof(Newtonsoft.Json.JsonConvert).Assembly.Location));
refList.Add(MetadataReference.CreateFromFile(typeof(System.Runtime.AssemblyTargetedPatchBandAttribute).Assembly.Location));
refList.Add(MetadataReference.CreateFromFile(System.IO.Path.Combine(System.IO.Path.GetDirectoryName(typeof(object).Assembly.Location), "netstandard.dll")));
var tree = CSharpSyntaxTree.ParseText(code);
var compilation = CSharpCompilation.Create("test")
.WithOptions(new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary))
.AddReferences(refList.ToArray()).AddSyntaxTrees(tree);
using (var stream = new MemoryStream())
{
var emitResult = compilation.Emit(stream);
if (emitResult.Success)
{
stream.Seek(0, SeekOrigin.Begin);
var assembly = Assembly.Load(stream.ToArray());
var typeResult = assembly.GetType("Result");
var m = Activator.CreateInstance(typeResult);
var Type = m.GetType();
return typeResult.GetMethod("GetType2").Invoke(m, null) as Type;