发现EF中字段错误

在使用EF时，报错：

对一个或多个实体的验证失败。有关详细信息，请参见“EntityValidationErrors”属性

添加一个验证方法：

代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;
using Rongzi.BZone.Functions;
using Rongzi.BZone.Common.Util;
using System.Data.Entity.Validation;
using System.Text;
using System.IO;

namespace Rongzi.BZone.Controllers.Manage
{
    public class ManageUserInfoApiController : ApiController
    {
        RongziBZoneEntities entity = new RongziBZoneEntities();

        /// <summary>
        /// 后台认证用户
        /// </summary>
        /// <param name="req"></param>
        /// <returns></returns>
        [HttpPost]
        public ResponseContext EditCustomerInfo(RequestContext<CustomerInfo> req)
        {
            ResponseContext result = new ResponseContext();
            var obj = req.Content;
            if (obj == null)
            {
                result.Head.Ret = -;
                result.Head.Code = ErrCode.ParameterError;
                return result;
            }
            CustomerInfo info = entity.CustomerInfo.Where(x => x.IsDeleted == false).Where(x => x.CustomerID==obj.CustomerID).FirstOrDefault();
            if (info == null)
            {
                result.Head.Ret = -;
                result.Head.Code = ErrCode.DataIsnotExist;
                return result;
            }
            info.IdentificationState = obj.IdentificationState;
            info.IdentificationMemo = obj.IdentificationMemo;
            info.IsDeleted = obj.IsDeleted;
            info.UpdateUser = obj.UpdateUser;
            info.UpdateTime = DateTime.Now;
            IsValided<CustomerInfo>(info);
            entity.SaveChanges();
            return result;
        }

        public bool IsValided<T>(T model) where T : class
        {
            DbEntityValidationResult vResult = entity.Entry<T>(model).GetValidationResult();
            if (vResult == null) return true;
            if (vResult.IsValid) return true;
            StringBuilder builder = new StringBuilder();
            foreach (DbValidationError item in vResult.ValidationErrors)
            {
                builder.Append("出错字段：" + item.PropertyName);
                builder.Append("<br/>");
                builder.Append("错误描述：" + item.ErrorMessage);
                builder.Append("<br />");
            }
            throw new Exception("数据验证失败，" + builder.ToString());
            return false;
        }
        #endregion
    }
}
 

这样就可以直接查出那些错，

我这个就是有个字段customerCard字段长度在数据库中由50改成了200，我看ef是string类型，就没有在意，然后就报错，长度不能超过50

这个也可以直接关掉ef的验证

      entity.Configuration.ValidateOnSaveEnabled = false;

这样也可以