[HttpPost]
    public async Task<JsonResult> SaveNewCustomerAsnyc(AddCustomerInput input)
    {
      if (!ModelState.IsValid)
      {
        return Json(Result.FromCode(ResultCode.InvalidParams));
      }

      .....
    }

public class ApiValidationFilter : IActionFilter
  {
    public bool AllowMultiple => false;

    public async Task<HttpResponseMessage> ExecuteActionFilterAsync(HttpActionContext actionContext, CancellationToken cancellationToken, Func<Task<HttpResponseMessage>> continuation)
    {
      var method = actionContext.ActionDescriptor.GetMethodInfoOrNull();
      if (method == null)
      {
        return await continuation();
      }      

      if (!actionContext.ModelState.IsValid)
      {
        var error = actionContext.ModelState.GetValidationSummary();
        var result = Result.FromError($"參數(shù)驗(yàn)證不通過：{error}", ResultCode.InvalidParams);
        return actionContext.Request.CreateResponse(result);
      }

      return await continuation();
    }
}

public static class ModelStateExtensions
  {
    /// <summary>
    /// 獲取驗(yàn)證消息提示并格式化提示
    /// </summary>
    public static string GetValidationSummary(this ModelStateDictionary modelState, string separator = "\r\n")
    {
      if (modelState.IsValid) return null;

      var error = new StringBuilder();

      foreach (var item in modelState)
      {
        var state = item.Value;
        var message = state.Errors.FirstOrDefault(p => !string.IsNullOrWhiteSpace(p.ErrorMessage))?.ErrorMessage;
        if (string.IsNullOrWhiteSpace(message))
        {
          message = state.Errors.FirstOrDefault(o => o.Exception != null)?.Exception.Message;
        }
        if (string.IsNullOrWhiteSpace(message)) continue;

        if (error.Length > 0)
        {
          error.Append(separator);
        }

        error.Append(message);
      }

      return error.ToString();
    }
  }

if (!ModelState.IsValid)
{
  return BadRequest(ModelState);
}

public class ApiBehaviorOptions
  {
    public Func<ActionContext, IActionResult> InvalidModelStateResponseFactory { get; set; }

    public bool SuppressModelStateInvalidFilter { get; set; }

    public bool SuppressInferBindingSourcesForParameters { get; set; }

    public bool SuppressConsumesConstraintForFormFileParameters { get; set; }
  }

public void ConfigureServices(IServiceCollection services)
    {      
      services
         .AddMvc()
        .AddXmlSerializerFormatters() //設(shè)置支持XML格式輸入輸出
        .SetCompatibilityVersion(CompatibilityVersion.Version_2_1);

      //禁用默認(rèn)行為
      services.Configure<ApiBehaviorOptions>(options =>
      {
        options.SuppressModelStateInvalidFilter = true;
      });
    }

public void ConfigureServices(IServiceCollection services)
    {
      .....
      services
         .AddMvc(options =>
         {
           options.Filters.Add<ApiValidationFilter>();
         })
        .AddXmlSerializerFormatters() //設(shè)置支持XML格式輸入輸出
        .SetCompatibilityVersion(CompatibilityVersion.Version_2_1);

    }

public void ConfigureServices(IServiceCollection services)
    {      
      services
         .AddMvc()
        .AddXmlSerializerFormatters() //設(shè)置支持XML格式輸入輸出
        .SetCompatibilityVersion(CompatibilityVersion.Version_2_1);

      //參數(shù)驗(yàn)證
      services.Configure<ApiBehaviorOptions>(options =>
      {
        options.InvalidModelStateResponseFactory = (context) =>
        {
          var error = context.ModelState.GetValidationSummary();
          
          return new JsonResult(Result.FromError($"參數(shù)驗(yàn)證不通過：{error.ToString()}", ResultCode.InvalidParams));
        };
      });
    }