如何根据某些条件向模型类添加属性 [英] How Can I Add Attributes To Model Class Based On Some Conditions

问题描述

亲爱的所有人，



我想根据某些条件为模型类属性添加属性


$ b $例如：



假设以下EmployeeModel类：

Dear All,

I want to add attributes to model class properties based on some conditions

example:

Suppose the following EmployeeModel Class:

public class EmployeeModel
    {
        public int EmployeeId { get; set; }

        [Required]
        public string EmployeeName { get; set; }
 
    }

我想根据某些条件在EmployeeName上添加Required属性。



我该如何实现？

I want to add the Required attribute on EmployeeName Based on Some Condition.

How can i implement that?

推荐答案

这是更新后的代码

< br $> b $ b

班级档案

Here is the updated code


Class file

public class ConditionalRequired : ValidationAttribute, IClientValidatable
    {
        public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context)
        {
            var mcvrTwo = new ModelClientValidationRule();
            mcvrTwo.ValidationType = "contactnovalid";
            mcvrTwo.ErrorMessage = "Contact No is not valid.";
            mcvrTwo.ValidationParameters.Add
            ("contactnoregex", @"\b\d{10}\b");
            return new List<ModelClientValidationRule> { mcvrTwo };
        }

        protected override ValidationResult IsValid(object value, ValidationContext validationContext)
        {
            var obj = validationContext.ObjectInstance as Customer;
            if (obj.CustomerID == 1)
            {
                return ValidationResult.Success;
            }
            return new ValidationResult("Contact No is not valid");
        }
    }

CSHTML文件

CSHTML file

<script src="~/Scripts/jquery-1.10.2.js"></script>
<script src="~/Scripts/jquery.validate.min.js"></script>
<script src="~/Scripts/jquery.validate.unobtrusive.min.js"></script>
<script src="~/Scripts/MicrosoftAjax.js"></script>

<script type="text/javascript">

.validator.addMethod（ contactnovalid， function （value，element，contactnoregex）{
var patt = new RegExp （contactnoregex）;
if （patt.test（value） ）
return true ;
return false ;
}）;

.validator.addMethod("contactnovalid", function (value, element, contactnoregex) { var patt = new RegExp(contactnoregex); if (patt.test(value)) return true; return false; });

.validator.unobtrusive.adapters.add（ contactnovalid，[ contactnoregex]， function （options）{
options.rules [ contactnovalid] = options.params.contactnoregex;
options.messages [ contactnovalid] = options.message;
}）;
< / script>

.validator.unobtrusive.adapters.add("contactnovalid", ["contactnoregex"], function (options) { options.rules["contactnovalid"] = options.params.contactnoregex; options.messages["contactnovalid"] = options.message; }); </script>

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