feat(wxapi): 新增自定义 JSON 转换器 TextualLongArrayConverter

src/SKIT.FlurlHttpClient.Wechat.Api/Converters/Internal/System.Text.Json/Array[Long]/TextualLongArrayConverter.cs

@@ -0,0 +1,74 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Text.Json.Serialization;
+
+namespace System.Text.Json.Converters
+{
+    internal class TextualLongArrayConverter : JsonConverter<long[]?>
+    {
+        public override long[]? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+        {
+            if (reader.TokenType == JsonTokenType.Null)
+            {
+                return null;
+            }
+            else if (reader.TokenType == JsonTokenType.StartArray)
+            {
+                IList<long> list = new List<long>();
+
+                while (reader.Read())
+                {
+                    switch (reader.TokenType)
+                    {
+                        case JsonTokenType.Number:
+                            {
+                                long value = reader.GetInt64();
+                                list.Add(value);
+                            }
+                            break;
+
+                        case JsonTokenType.String:
+                            {
+                                string? value = reader.GetString();
+                                if (!long.TryParse(value, out long l))
+                                    throw new JsonException($"Could not parse String '{value}' to Long.");
+
+                                list.Add(l);
+                            }
+                            break;
+
+                        case JsonTokenType.EndArray:
+                            return list.ToArray();
+
+                        case JsonTokenType.Comment:
+                            break;
+
+                        default:
+                            throw new JsonException($"Unexpected JSON token type '{reader.TokenType}' when reading.");
+                    }
+                }
+            }
+
+            throw new JsonException($"Unexpected JSON token type '{reader.TokenType}' when reading.");
+        }
+
+        public override void Write(Utf8JsonWriter writer, long[]? value, JsonSerializerOptions options)
+        {
+            if (value != null)
+            {
+                writer.WriteStartArray();
+
+                foreach (long l in value)
+                {
+                    writer.WriteStringValue(l.ToString());
+                }
+
+                writer.WriteEndArray();
+            }
+            else
+            {
+                writer.WriteNullValue();
+            }
+        }
+    }
+}