NET 基于ValidationContext和反射,调用过滤器校验参数
作者:互联网
业务背景:
页面可视化批量操作数据,支持添加修改删除等操作,某天耐不住客户拍脑袋,要求把该功能改成文件上传 文件流没办法使用之前的【过滤器校验参数】逻辑,重新写容易出毛病【主要是上头懒得折腾】,就想出了这个骚操作 PS1:以前流程为【浏览器选择文件 / 浏览器展示&操作数据 / 调用批量上传数据接口】 PS2:现在流程为【浏览器选择文件 / 调用上传接口】
1.添加引用[展开项目 / 选中“引用” / 右键 / 添加引用 / 程序集]:System.ComponentModel.DataAnnotations
2.校验核心代码
var itemModel = dtoList[i]; var context = new System.ComponentModel.DataAnnotationsValidationContext(itemModel); // 存在错误信息的字段集合 var itemErrorFieldNameList = new List<string>(); // 循环属性 foreach (var itemMapping in mappingList) { context.MemberName = itemMapping.RealName; context.DisplayName = itemMapping.RealName; var itemValue = entityType.GetProperty(itemMapping.RealName).GetValue(itemModel); // 循环属性的特性 foreach (var itemObject in entityType.GetProperty(itemMapping.RealName).GetCustomAttributes(false)) { ValidationAttribute validationAttribute = null; if (itemObject is Filters.CustomRequiredAttribute) validationAttribute = itemObject as Filters.CustomRequiredAttribute; else if (itemObject is Filters.CustomNotSupportAttribute) validationAttribute = itemObject as Filters.CustomNotSupportAttribute; else if (itemObject is Filters.CustomRequiredDateAttribute) validationAttribute = itemObject as Filters.CustomRequiredDateAttribute; if (validationAttribute == null) continue; var itemBoo = validationAttribute.GetValidationResult(itemValue, context); if (itemBoo != null) itemErrorFieldNameList.Add(itemBoo.ErrorMessage); } } if (!itemErrorFieldNameList.IsNullOrEmpty()) errorFieldNameList.Add($"第 {i + 2} 行字段【{itemErrorFieldNameList.Distinct().Join("/")}】的数据有问题!");
3.Mapping
4.CustomRequiredAttribute
[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter, AllowMultiple = false)] public class CustomRequiredAttribute : ValidationAttribute { protected override ValidationResult IsValid(object value, ValidationContext validationContext) { var validPropertityDesc = validationContext.DisplayName; if (!value.IsValid()) { return new ValidationResult(validPropertityDesc); } return ValidationResult.Success; } }
标签:RealName,itemMapping,校验,itemObject,validationAttribute,Filters,var,NET,Validatio 来源: https://www.cnblogs.com/CRobot/p/15469752.html