blocks|key|1332762|text|这意味着您无法确定在runtime上传递给属性的参数的值，而必须在compile+time处，以便将该值嵌入到程序集中。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1332763|错误消息值需要是一个常量表达式。|1332764|关于信息，属性参数只能是bool、字节、char、short、int、long、float、double、string、System.Type和枚举类型。|1332765|entityMap^0|A|7|X|C|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]|$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Q|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|R|8|@]|D|@]|E|$]]|$1|J|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|K|$]]

It means that you cannot determine the value of the argument you are passing into the attribute at <code>runtime</code>, it must be at <code>compile time</code> so the value is embedded into the assembly.

The error message value needs to be a constant expression.

For information, attribute arguments can only be of types bool, byte, char, short, int, long, float, double, string, System.Type, and enums.

blocks|key|1607887|text|相反，您应该查看该属性的ErrorMessageResourceName和ErrorMessageResourceType属性。它们确实允许从资源中提取错误消息。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1607888|entityMap^0|C|O|11|O|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

You should instead look at the <code>ErrorMessageResourceName</code> and <code>ErrorMessageResourceType</code> properties of this attribute. They do allow the error message to be pulled from a resource.

blocks|key|1607893|text|当您使用ErrorMessage属性时，只能为其分配常量字符串或字符串文本。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1607894|使用ErrorMessageResourceType和ErrorMessageResourceName来详细说明您的资源。|1607895|[RegularExpression(
++++"%5E[a-zA-Z0-9_]*$",+
++++ErrorMessageResourceType=typeof(Resources.RegistrationModel),
++++ErrorMessageResourceName=+"UsernameError"
)]|code-block|syntax|javascript|1607896|注意，资源必须是公共(可以在资源编辑器中设置)。|BOLD|1607897|​|1607898|📷|atomic|1607899|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/7f52d44428be552b388f40cf2ebc7461.jpg|imageAlt^0|4|C|0|2|O|R|O|0|0|8|2|0|0|0|1|0|0^^$0|@$1|2|3|4|5|6|7|13|8|@$9|14|A|15|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|16|8|@$9|17|A|18|B|C]|$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|1B|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1C|8|@$9|1D|A|1E|B|O]]|D|@]|E|$]]|$1|P|3|Q|5|6|7|1F|8|@]|D|@]|E|$]]|$1|R|3|S|5|T|7|1G|8|@]|D|@$9|1H|A|1I|1|1J]]|E|$]]|$1|U|3|-4|5|6|7|1K|8|@]|D|@]|E|$]]]|V|$W|$5|X|Y|Z|E|$10|11|12|-4]]]]

When you are using the <code>ErrorMessage</code> property only constant strings or string literal can be assigned to it.

Use the <code>ErrorMessageResourceType</code> and <code>ErrorMessageResourceName</code> instead to specity your resources. 

<pre><code>[RegularExpression(
 "^[a-zA-Z0-9_]*$", 
 ErrorMessageResourceType=typeof(Resources.RegistrationModel),
 ErrorMessageResourceName= "UsernameError"
)]
</code></pre>

Note that the resources must be public (can be set in the resource editor).

<a href="https://i.stack.imgur.com/xmsQV.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/xmsQV.jpg" alt="Setting resource access to public"></a>

blocks|key|58018|text|试试FluentModelMetaDataProvider。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|58019|设法以强类型的方式为错误消息使用资源。|58020|看起来是这样的：|58021|using+System.Web.Mvc.Extensibility;

namespace+UI.Model
{
++++public+class+StoreInputMetadata+:+ModelMetadataConfigurationBase<StoreInput>
++++{
++++++++public+StoreInputMetadata()
++++++++{
++++++++++++Configure(m+=>+m.Id)
++++++++++++++++.Hide();
++++++++++++Configure(model+=>+model.Name)
++++++++++++++++.Required(Resources.Whatever.StoreIsRequired)
++++++++++++++++.MaximumLength(64,+Resources.Whatever.StoreNameLengthSomething);
++++++++}
++++}
}|code-block|syntax|javascript|58022|错误信息告诉我什么？
属性参数必须是属性参数类型的常量表达式、类型表达式或数组创建表达式。|blockquote|58023|已经是不言自明的了。C#不是像Ruby那样的动态语言，您可以编写在运行时继承随机基类的类。:)|58024|下面是斯基特是怎么说的。|58025|entityMap|0|LINK|mutability|MUTABLE|url|http://weblogs.asp.net/rashid/archive/2009/12/24/introducing-fluent-metadataprovider-for-asp-net-mvc.aspx|1|https://stackoverflow.com/questions/392083/use-a-global-setting-as-an-attribute-argument/392096#392096^0|2|R|0|0|0|0|0|0|0|0|3|1|0^^$0|@$1|2|3|4|5|6|7|13|8|@]|9|@$A|14|B|15|1|16]]|C|$]]|$1|D|3|E|5|6|7|17|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|18|8|@]|9|@]|C|$]]|$1|H|3|I|5|J|7|19|8|@]|9|@]|C|$K|L]]|$1|M|3|N|5|O|7|1A|8|@]|9|@]|C|$]]|$1|P|3|Q|5|6|7|1B|8|@]|9|@]|C|$]]|$1|R|3|S|5|6|7|1C|8|@]|9|@$A|1D|B|1E|1|1F]]|C|$]]|$1|T|3|-4|5|6|7|1G|8|@]|9|@]|C|$]]]|U|$V|$5|W|X|Y|C|$Z|10]]|11|$5|W|X|Y|C|$Z|12]]]]

Try <a href="http://weblogs.asp.net/rashid/archive/2009/12/24/introducing-fluent-metadataprovider-for-asp-net-mvc.aspx" rel="nofollow noreferrer">FluentModelMetaDataProvider</a>.
Managed to use resources for error messages in strongly typed fashion.
Looks like this:
<pre><code>using System.Web.Mvc.Extensibility;

namespace UI.Model
{
 public class StoreInputMetadata : ModelMetadataConfigurationBase&lt;StoreInput&gt;
 {
 public StoreInputMetadata()
 {
 Configure(m =&gt; m.Id)
 .Hide();
 Configure(model =&gt; model.Name)
 .Required(Resources.Whatever.StoreIsRequired)
 .MaximumLength(64, Resources.Whatever.StoreNameLengthSomething);
 }
 }
}
</code></pre>
<hr />
<blockquote>
What is the error message telling me?
<blockquote>
An attribute argument must be a constant expression, typeof expression or array creation expression of an attribute parameter type.
</blockquote>
</blockquote>
It's already self explanatory. C# isn't dynamic language like Ruby where You can write classes that inherits random base class at runtime. :)
<a href="https://stackoverflow.com/questions/392083/use-a-global-setting-as-an-attribute-argument/392096#392096">Here's</a> what Skeet says about this.

blocks|key|1607979|text|我们现在可以对强类型错误消息使用名称：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1607980|[RegularExpression("%5E[a-zA-Z0-9_]*$",+
++ErrorMessageResourceType=typeof(Resources.RegistrationModel),
++ErrorMessageResourceName=nameof(Resources.RegistrationModel.UsernameError)
)]|code-block|syntax|javascript|1607981|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|$]]

We can now use nameof for strongly typed error messages:

<pre><code>[RegularExpression("^[a-zA-Z0-9_]*$", 
 ErrorMessageResourceType=typeof(Resources.RegistrationModel),
 ErrorMessageResourceName=nameof(Resources.RegistrationModel.UsernameError)
)]
</code></pre>

Why can't I do like this?

<pre><code>[Required(ErrorMessage = "*")]
[RegularExpression("^[a-zA-Z0-9_]*$", ErrorMessage = Resources.RegistrationModel.UsernameError)]
public string Username { get; set; }
</code></pre>

What is the error message telling me?

<blockquote>
 An attribute argument must be a
 constant expression , typeof
 expression or array creation
 expression of an attribute parameter
 type.
</blockquote>

Why can't I use resources as ErrorMessage with DataAnnotations?

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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为什么我不能这样做？[Required(ErrorMessage = "*")][RegularExpression("^[a-zA-Z0-9_]*$", ErrorMessage = Resources.RegistrationModel.UsernameError)]public string Username {...

问为什么我不能用ErrorMessage和DataAnnotations来使用资源呢？
EN

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问为什么我不能用ErrorMessage和DataAnnotations来使用资源呢？EN