asp.net core ModelState 模型状态验证扩展类

using DMS.Common.BaseResult;
using Microsoft.AspNetCore.Mvc.ModelBinding;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

/// <summary>
/// 聚合扩展方法类
/// </summary>
public static class ModelStateExts
{
    #region [ 得到模型错误消息 NonAction Task<string> ModelStateMsg(ModelStateDictionary modelState, List<string> PartValidKeys = null) ]

    /// <summary>
    /// 得到模型错误消息
    /// <code>
    /// <![CDATA[
    ///     if (ModelState.IsValidOK(out string errmsg))
    ///     {
    ///         return await Service.GetLiveVodAndVideoProductList(CurrentUserTicket.ID.ToLong(), param);
    ///     }
    ///     else
    ///     {
    ///         return new ResponsePageResult<ProductVodOrVideoResult> { errno = 1, errmsg = errmsg };
    ///     }
    /// ]]>
    /// </code>
    /// </summary>
    /// <param name="modelState"></param>
    /// <param name="errmsg">返回的错误消息</param>
    /// <param name="PartValidKeys">要验证的属性集合</param>
    /// <returns></returns>
    public static bool IsValidOK(this ModelStateDictionary modelState, out string errmsg, List<string> PartValidKeys = null)
    #region [ MyRegion ]
    {
        var errorCount = 0;

        List<string> sb = new List<string>();
        //获取所有错误的Key
        List<string> keys = PartValidKeys ?? modelState.Keys.ToList();

        //获取每一个key对应的ModelStateDictionary
        foreach (var key in keys)
        {
            var errors = modelState[key].Errors.ToList();
            errorCount += errors.Count;

            //将错误描述添加到sb中
            foreach (var error in errors)
            {
                sb.Add(error.ErrorMessage);
            }
        }

        var result = string.Join("，", sb);
        if (string.IsNullOrWhiteSpace(result))
        {
            result = $"{result}。";
        }

        errmsg = result;

        return errorCount > 0 ? false : true;
    }
    #endregion

    #endregion

    #region [ 进行模型验证，并返回服务结果 ]

    /// <summary>
    /// 执行模型验证，并返回指定服务方法的执行结果
    /// 调用方式：return await ModelState.GetResult(Service.ActionName, param);
    /// </summary>
    /// <typeparam name="TParam"></typeparam>
    /// <typeparam name="TResult"></typeparam>
    /// <param name="modelState"></param>
    /// <param name="func"></param>
    /// <param name="param"></param>
    /// <param name="PartValidKeys"></param>
    /// <returns></returns>
    public async static Task<TResult> Execute<TParam, TResult>(this ModelStateDictionary modelState, Func<TParam, Task<TResult>> func, TParam param, List<string> PartValidKeys = null) where TResult : class, new()
        #region [ MyRegion ]
    {
        if (IsValidOK(modelState, out string errmsg, PartValidKeys: PartValidKeys))
        {
            var result = new TResult { };

            return await func.Invoke(param);
        }
        else
        {
            return new DataResultBase { errno = 600, errmsg = errmsg } as TResult;
        }
    }
    #endregion

    #endregion
}