C# 中的本地化属性参数

发布于 2024-08-19 03:18:47 字数 591 浏览 1 评论 0原文

在 C# 中，属性参数必须是常量表达式、typeof 或数组创建表达式。

各种库（例如 Castle 验证器）允许指定将看似本地化的错误消息传递给属性构造函数：

//this works
[ValidateNonEmpty("Can not be empty")]

//this does not compile
[ValidateNonEmpty(Resources.NonEmptyValidationMessage)]

有什么方法可以解决此问题并本地化这些参数吗？

如果使用 Castle Validator 时没有解决此问题的方法，是否有类似于 Castle Validator 的验证库可以本地化验证消息？

编辑：我发现数据注释验证库如何解决这个问题。非常优雅的解决方案： http://haacked.com/archive/ 2009/12/07/本地化-aspnetmvc-validation.aspx

原文

In C#, attribute parameters require to be a constant expression, typeof or array creation expression.

Various libraries, like for example Castle validator, allow specifying passing what seems like localized error messages to attribute constructor:

//this works
[ValidateNonEmpty("Can not be empty")]

//this does not compile
[ValidateNonEmpty(Resources.NonEmptyValidationMessage)]

Is there any way how to approach this problem and localize these arguments?

In case there is no workaround for this when using Castle Validator, is there a validation library similar to Castle Validator that allows localization of validation messages?

EDIT: I found how Data Annotations validation library approaches this problem. Very elegant solution: http://haacked.com/archive/2009/12/07/localizing-aspnetmvc-validation.aspx

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旧时模样 2024-08-26 03:18:47

我们也遇到了类似的问题，但与 Castle 无关。我们使用的解决方案只是定义一个从另一个属性派生的新属性，并使用常量字符串作为对资源管理器的查找，如果没有找到，则返回到键字符串本身。

[AttributeUsage(AttributeTargets.Class
  | AttributeTargets.Method
  | AttributeTargets.Property
  | AttributeTargets.Event)]
public class LocalizedIdentifierAttribute : ... {
  public LocalizedIdentifierAttribute(Type provider, string key)
    : base(...) {
    foreach (PropertyInfo p in provider.GetProperties(
      BindingFlags.Static | BindingFlags.NonPublic)) {
      if (p.PropertyType == typeof(System.Resources.ResourceManager)) {
        ResourceManager m = (ResourceManager) p.GetValue(null, null);

        // We found the key; use the value.
        return m.GetString(key);
      }
    }

    // We didn't find the key; use the key as the value.
    return key;
  }
}

用法类似于：

[LocalizedIdentifierAttribute(typeof(Resource), "Entities.FruitBasket")]
class FruitBasket {
  // ...
}

然后，每个特定于语言环境的资源文件都可以根据需要定义自己的 Entities.FruitBasket 条目。

We had a similar issue, although not with Castle. The solution we used was simply to define a new attribute which was derived from the other one, and which used the constant string as a lookup to the resources manager, and fell back to the key string itself if none was found.

[AttributeUsage(AttributeTargets.Class
  | AttributeTargets.Method
  | AttributeTargets.Property
  | AttributeTargets.Event)]
public class LocalizedIdentifierAttribute : ... {
  public LocalizedIdentifierAttribute(Type provider, string key)
    : base(...) {
    foreach (PropertyInfo p in provider.GetProperties(
      BindingFlags.Static | BindingFlags.NonPublic)) {
      if (p.PropertyType == typeof(System.Resources.ResourceManager)) {
        ResourceManager m = (ResourceManager) p.GetValue(null, null);

        // We found the key; use the value.
        return m.GetString(key);
      }
    }

    // We didn't find the key; use the key as the value.
    return key;
  }
}

Usage is something like:

[LocalizedIdentifierAttribute(typeof(Resource), "Entities.FruitBasket")]
class FruitBasket {
  // ...
}

Then each locale-specific resource file can define its own Entities.FruitBasket entry, as needed.

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箹锭⒈辈孓 2024-08-26 03:18:47

它开箱即用：

    [ValidateNonEmpty(
        FriendlyNameKey = "CorrectlyLocalized.Description",
        ErrorMessageKey = "CorrectlyLocalized.DescriptionValidateNonEmpty",
        ResourceType = typeof (Messages)
        )]
    public string Description { get; set; }

It works out of the box:

    [ValidateNonEmpty(
        FriendlyNameKey = "CorrectlyLocalized.Description",
        ErrorMessageKey = "CorrectlyLocalized.DescriptionValidateNonEmpty",
        ResourceType = typeof (Messages)
        )]
    public string Description { get; set; }

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