添加项目文件。

test/Basic/Controllers/JsonAnnotationsController.cs

@@ -0,0 +1,38 @@
+using System.Collections.Generic;
+using System.Text.Json.Serialization;
+using Microsoft.AspNetCore.Mvc;
+
+namespace Basic.Controllers
+{
+    [Produces("application/json")]
+    public class JsonAnnotationsController
+    {
+        [HttpGet("/promotions")]
+        public IEnumerable<Promotion> GetPromotions()
+        {
+            return new[]
+            {
+                new Promotion { Code = "A", DiscountType = DiscountType.Amount, Discount = 30 },
+                new Promotion { Code = "B", DiscountType = DiscountType.Percentage, Discount = 10 }
+            };
+        }
+    }
+
+    public class Promotion
+    {
+        [JsonPropertyName("promo-code")]
+        public string Code { get; set; }
+
+        public DiscountType DiscountType { get; set; }
+
+        [JsonIgnore]
+        public int Discount { get; set; }
+    }
+
+    [JsonConverter(typeof(JsonStringEnumConverter))]
+    public enum DiscountType
+    {
+        Percentage,
+        Amount
+    }
+}