在 ASP.NET Core 6 中，可以使用 System.Text.Json.Serialization 命名空间中的 converter 属性将 DateOnly 和 TimeOnly 类型转换为字符串，以便在查询参数中传递。以下是一个示例：

首先在项目的 Startup.cs 文件中添加以下代码：

using System.Text.Json.Serialization;

public void ConfigureServices(IServiceCollection services)
{
    services.AddControllers()
        .AddJsonOptions(options =>
        {
            options.JsonSerializerOptions.Converters.Add(new JsonStringEnumConverter());
            options.JsonSerializerOptions.Converters.Add(new JsonTimeOnlyConverter());
            options.JsonSerializerOptions.Converters.Add(new JsonDateOnlyConverter());
        });
}

然后，定义以下三个转换器：

using System;
using System.Text.Json;
using System.Text.Json.Serialization;

public class JsonTimeOnlyConverter : JsonConverter
{
    public override TimeOnly Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
    {
        return TimeOnly.Parse(reader.GetString());
    }

    public override void Write(Utf8JsonWriter writer, TimeOnly value, JsonSerializerOptions options)
    {
        writer.WriteStringValue(value.ToString());
    }
}

public class JsonDateOnlyConverter : JsonConverter
{
    public override DateOnly Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
    {
        return DateOnly.Parse(reader.GetString());
    }

    public override void Write(Utf8JsonWriter writer, DateOnly value, JsonSerializerOptions options)
    {
        writer.WriteStringValue(value.ToString());
    }
}

public class JsonStringEnumConverter : JsonConverterFactory
{
    public override bool CanConvert(Type typeToConvert)
    {
        return typeToConvert.IsEnum;
    }

    public override JsonConverter CreateConverter(Type typeToConvert, JsonSerializerOptions options)
    {
        var converterType = typeof(JsonStringEnumConverter<>).MakeGenericType(typeToConvert);
        return (JsonConverter)Activator.CreateInstance(converterType);
    }
}

public class JsonStringEnumConverter : JsonConverter where T : struct, Enum
{
    public override T Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
    {
        return Enum.Parse(reader.GetString(), true