将具有特定属性的属性转换为 JSON 字符串

Question

我在下面编写了以下函数，将具有 [Key] 属性的对象转换为 JSON 字符串。对我来说似乎有很多代码，有没有更现代的功能我可以利用它来重构它？

    public string FormatKeyAttributesAsJson<T>(object value)
    {
        lock (lockObject)
        {                
            BindingFlags flags = BindingFlags.Public | BindingFlags.Instance;
            var properties = typeof(T).GetProperties(flags)
                .Where(p => p.GetCustomAttribute<KeyAttribute>() != null)
                .ToList();

            StringBuilder jsonString = new StringBuilder();
            jsonString.Append("{");
            for (int i = 0; i < properties.Count; i++)
            {
                if(i == properties.Count - 1)
                {
                    jsonString.Append($"\"{properties[i].Name}\":\"{properties[i].GetValue(value)}\"");
                }
                else
                {
                    jsonString.Append($"\"{properties[i].Name}\":\"{properties[i].GetValue(value)}\",");
                }
                
            }
            jsonString.Append("}");
            return jsonString.ToString();
        }
    }

Answer 1

小重构以使用 System.Text.Json 命名空间中的新 JsonSerializer：

public string FormatKeyAttributesAsJson2<T>(object value)
{
    lock (lockObject)
    {
        BindingFlags flags = BindingFlags.Public | BindingFlags.Instance;
        // create here a Dictionary<string, object>
        var dict = typeof(T).GetProperties(flags)
            .Where(p => p.GetCustomAttribute<KeyAttribute>() != null)
            .ToDictionary<PropertyInfo, string, object>(p => p.Name, p => p.GetValue(value));
        // which will be seriazlied without any problems
        return JsonSerializer.Serialize(dict);
    }
}