blocks|key|1537200|text|正如Murali所述，数据注释属性值必须是编译时常量。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1537201|如果你想执行基于其他模型值的动态验证，你可以尝试使用某种第三方框架(例如，Fluent+Validation，甚至can+be+integrated+in+ASP.NET's+model+validation+)。|offset|length|1537202|entityMap|0|LINK|mutability|MUTABLE|url|http://fluentvalidation.codeplex.com/|1|http://fluentvalidation.codeplex.com/wikipage?title=mvc&referringTitle=Documentation^0|0|11|H|0|1L|1B|1|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@$D|R|E|S|1|T]|$D|U|E|V|1|W]]|A|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]|N|$5|I|J|K|A|$L|O]]]]

As Murali stated Data Annotation attributes values must be compile time constants.

If you want to perform dynamic validation based on other model values you can try with some kind of third party framework (e.g. <a href="http://fluentvalidation.codeplex.com/" rel="nofollow">Fluent Validation</a>, it even <a href="http://fluentvalidation.codeplex.com/wikipage?title=mvc&amp;referringTitle=Documentation" rel="nofollow">can be integrated in ASP.NET's model validation</a> too).

blocks|key|1532628|text|我相信有一种方法可以通过继承IValidatableObject接口来实现它。这样做之后，只要在服务器端验证了ModelState，您就可以执行所需的所有检查。它看起来像这样：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1532629|public+class+SomeClass:+IValidatableObject+{
++++private+RegEx+validation;
++++public+SomeClass(RegEx+val)+{
++++++++this.validation+=+val;
++++}

++++public+IEnumerable<ValidationResult>+Validate(ValidationContext+validationContext)
++++{
++++++++var+results+=+new+List<ValidationResult>();
++++++++//+perform+validation+logic+-+check+regex+etc...
++++++++//+if+an+error+occurs:
++++++++results.Add(new+ValidationResult('error+message'));
++++}
}|code-block|syntax|javascript|1532630|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I believe there might be a way to implement this by inheriting the IValidatableObject interface. Upon doing so whenever the ModelState gets validated on the server side you could perform all the necessary checks that you wish.
It would look something like:

<pre><code>public class SomeClass: IValidatableObject {
 private RegEx validation;
 public SomeClass(RegEx val) {
 this.validation = val;
 }

 public IEnumerable&lt;ValidationResult&gt; Validate(ValidationContext validationContext)
 {
 var results = new List&lt;ValidationResult&gt;();
 // perform validation logic - check regex etc...
 // if an error occurs:
 results.Add(new ValidationResult('error message'));
 }
}
</code></pre>

blocks|key|1528277|text|您有两个选择，要么创建自己的验证属性，要么使整个模型“可验证”。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1528278|选项1|1528279|public+class+RegexFromDbValidatorAttribute+:+ValidationAttribute
{
++++private+readonly+IRepository+_db;

++++//parameterless+ctor+that+initializes+_db

++++public+override+ValidationResult+IsValid(object+value,+ValidationContext+context)
++++{
++++++++string+regexFromDb+=+_db.GetRegex();

++++++++Regex+r+=+new+Regex(regexFromDb);

++++++++if+(value+is+string+&&+r.IsMatch(value+as+string)){
++++++++++++return+ValidationResult.Success;
++++++++}else{
++++++++++++return+new+ValidationResult(FormatMessage(context.DisplayName));
++++++++}
++++}
}|code-block|syntax|javascript|1528280|然后在你的模型上：|1528281|[RegexFromDbValidator]
public+string+Telephone+{get;+set;}|1528282|选项2|1528283|public+SomeModel+:+IValidatableObject
{
++++private+readonly+IRepository+_db;

++++//don't+forget+to+initialize+_db+in+ctor

++++public+string+Telephone+{get;+set;}

++++public+IEnumerable<ValidationResult>+Validate(ValidationContext+context)
++++{

++++++++string+regexFromDb+=+_db.GetRegex();

++++++++Regex+r+=+new+Regex(regexFromDb);

++++++++if+(!r.IsMatch(Telephone))
++++++++++++yield+return+new+ValidationResult("Invalid+telephone+number",+new+[]{"Telephone"});
++++}
}|1528284|是一个很好的资源，它解释了如何创建验证属性|1528285|使用IValidatableObject的示例|1528286|entityMap^0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|10|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|11|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|12|8|@]|9|@]|A|$G|H]]|$1|Q|3|R|5|6|7|13|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|14|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|V|$]]

You have two options, either you create your own validation attribute or you make your whole model "validatable".

<h3>Option 1</h3>

<pre><code>public class RegexFromDbValidatorAttribute : ValidationAttribute
{
 private readonly IRepository _db;

 //parameterless ctor that initializes _db

 public override ValidationResult IsValid(object value, ValidationContext context)
 {
 string regexFromDb = _db.GetRegex();

 Regex r = new Regex(regexFromDb);

 if (value is string &amp;&amp; r.IsMatch(value as string)){
 return ValidationResult.Success;
 }else{
 return new ValidationResult(FormatMessage(context.DisplayName));
 }
 }
}
</code></pre>

Then on your model:

<pre><code>[RegexFromDbValidator]
public string Telephone {get; set;}
</code></pre>

<h3>Option 2</h3>

<pre><code>public SomeModel : IValidatableObject
{
 private readonly IRepository _db;

 //don't forget to initialize _db in ctor

 public string Telephone {get; set;}

 public IEnumerable&lt;ValidationResult&gt; Validate(ValidationContext context)
 {

 string regexFromDb = _db.GetRegex();

 Regex r = new Regex(regexFromDb);

 if (!r.IsMatch(Telephone))
 yield return new ValidationResult("Invalid telephone number", new []{"Telephone"});
 }
}
</code></pre>

<a href="http://www.codeproject.com/Articles/301022/Creating-Custom-Validation-Attribute-in-MVC-3" rel="nofollow">Here's</a> a good resource that explains how to create validation attributes 

<a href="http://www.itorian.com/2013/02/custom-validation-with.html" rel="nofollow">Here's</a> an example of using IValidatableObject

I need to set RegularExpression Dynamically in Model.

I mean, I have stored RegularExpression in table and then I will store that value in one variable.

Now I want to supply that variable in Regular Express validation.

i.e 

<pre><code>[RegularExpression(VariableValue, ErrorMessage = "Valid Phone is required")]
</code></pre>

Something like 

i.e 

<pre><code>string CustomExpress = "@"^(\+|\d)(?:\+?1[-. ]?)?$?([0-9]{2})$?[-. ]?([0-9]{1})[-. ]?([0-9]{9})$" (from Database's table)

[RegularExpression(CustomExpress, ErrorMessage = "Valid Phone is required")]
public string Phone { get; set; }
</code></pre>

Set RegularExpression Dynamically in Model

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我需要在模型中动态设置RegularExpression。我的意思是，我已经将RegularExpression存储在表中，然后我将该值存储在一个变量中。现在，我想在常规Express验证中提供该变量。i.e[RegularExpression(VariableValue, ErrorMessage = "Valid ...

问在模型中动态设置RegularExpression
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