業務背景：

頁面視覺化批量操作資料，支援新增修改刪除等操作，某天耐不住客戶拍腦袋，要求把該功能改成檔案上傳
檔案流沒辦法使用之前的【過濾器校驗引數】邏輯，重新寫容易出毛病【主要是上頭懶得折騰】，就想出了這個騷操作
PS1：以前流程為【瀏覽器選擇檔案 / 瀏覽器展示&操作資料 / 呼叫批量上傳資料介面】
PS2：現在流程為【瀏覽器選擇檔案 / 呼叫上傳介面】

1.新增引用[展開專案 / 選中“引用” / 右鍵 / 新增引用 / 程式集]：System.ComponentModel.DataAnnotations

2.校驗核心程式碼

                var itemModel = dtoList[i];
                
 
var context = new System.ComponentModel.DataAnnotationsValidationContext(itemModel);

                // 存在錯誤資訊的欄位集合
                var itemErrorFieldNameList = new List<string>();
                // 迴圈屬性
                foreach (var itemMapping in mappingList)
                {
                    context.MemberName 
 
= itemMapping.RealName;
                    context.DisplayName = itemMapping.RealName;
                    var itemValue = entityType.GetProperty(itemMapping.RealName).GetValue(itemModel);
                    // 迴圈屬性的特性
                    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} 行欄位【{itemErrorFieldNameList.Distinct().Join("/")}】的資料有問題！");

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;
        }
    }