我有以下模型：

public class SaveTemplateRequest
{
    [JsonProperty("templateType")]
    [Required(ErrorMessage = "TemplateType can not be empty")]
    public string TemplateType { get; set; }

    [JsonProperty("langs")]
    [Required(ErrorMessage = "Lang's can not be empty")]
    public List<PushContentRequest> PushLangsRequest { get; set; }

    [JsonProperty("appIds")]
    [Required(ErrorMessage = "AppIds can not be empty")]
    public List<string> AppIds { get; set; }

    [JsonProperty("advertisers")]
    [Required(ErrorMessage = "AdvertiserNames can not be empty")]
    [BindProperty(Name = "Name")]
    public List<string> Advertisers { get; set; }

    [JsonProperty("isactive")]
    [Required(ErrorMessage = "Isactive field is required")]
    public bool  Isactive { get; set; }

    [JsonProperty("category")]
    [Required(ErrorMessage = "Category can not be empty")]
    [BindProperty(Name = "Name")]
    public string Category { get; set; }

    [JsonProperty("timeAgo")]
    [Required(ErrorMessage = "TimeAgo can not be null")]
    public int TimeAgo { get; set; }

    [JsonProperty("pushTemplate")]
    public int PushTemplateId { get; set; }


}

我将使用JSON主体将其映射到HTTP请求。这是控制器的签名：

public async Task<IactionResult> SaveTemplate([FromBody] SaveTemplateRequest request)
        { ... }

但是，如果我的请求包含错误的JSON，则我没有来自[Required(ErrorMessage = "<here is a message>")]的消息，我在控制器的request变量中只有NULL。为什么会这样呢？如何在客户端上发送错误消息？