Support `enum` as dictionary keys.

Resolve #13552

framework/src/Volo.Abp.Json/Volo/Abp/Json/SystemTextJson/JsonConverters/AbpStringToEnumConverter.cs

@@ -1,5 +1,4 @@
 using System;
-using System.Collections.Generic;
 using System.Text.Json;
 using System.Text.Json.Serialization;
 
@@ -48,4 +47,14 @@ public class AbpStringToEnumConverter<T> : JsonConverter<T>
 
         JsonSerializer.Serialize(writer, value, _writeJsonSerializerOptions);
     }
+
+    public override T ReadAsPropertyName(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+    {
+        return (T)Enum.Parse(typeToConvert, reader.GetString());
+    }
+
+    public override void WriteAsPropertyName(Utf8JsonWriter writer, T value, JsonSerializerOptions options)
+    {
+        writer.WritePropertyName(Enum.GetName(typeof(T), value));
+    }
 }

framework/test/Volo.Abp.Json.Tests/Volo/Abp/Json/AbpStringToEnum_Tests.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Text.Json;
 using Shouldly;
 using Volo.Abp.Json.SystemTextJson.JsonConverters;
@@ -26,6 +27,16 @@ namespace Volo.Abp.Json
             testClass = JsonSerializer.Deserialize<TestClass>("{\"Day\": 1}", options);
             testClass.ShouldNotBeNull();
             testClass.Day.ShouldBe(DayOfWeek.Monday);
+
+            var dictionary = JsonSerializer.Deserialize<Dictionary<DayOfWeek, string>>("{\"Monday\":\"Mo\"}", options);
+            dictionary.ShouldNotBeNull();
+            dictionary.Keys.ShouldContain(DayOfWeek.Monday);
+            dictionary.Values.ShouldContain("Mo");
+
+            dictionary = JsonSerializer.Deserialize<Dictionary<DayOfWeek, string>>("{\"1\":\"Mo\"}", options);
+            dictionary.ShouldNotBeNull();
+            dictionary.Keys.ShouldContain(DayOfWeek.Monday);
+            dictionary.Values.ShouldContain("Mo");
         }
 
         [Fact]
@@ -45,6 +56,13 @@ namespace Volo.Abp.Json
             });
 
             testClassJson.ShouldBe("{\"Day\":1}");
+
+            testClassJson = JsonSerializer.Serialize(new Dictionary<DayOfWeek, string>
+            {
+                {DayOfWeek.Monday, "Mo"}
+            }, options);
+
+            testClassJson.ShouldBe("{\"Monday\":\"Mo\"}");
         }
 
         class TestClass