Entlib5字符串验证 [英] Entlib5 string validation

问题描述

如果这是规则，我该如何验证某些字符串：

How can I validate some string if this is the rule:

- can be empty
- if not empty -> max length: 30

我知道这两种方式：

[IgnoreNulls]
[StringLengthValidator(30)]

或

[ValidatorComposition(CompositionType.Or)]
[StringLengthValidator(30)] 
[NotNullValidator(Negated=true)]

但是有一种方法可以不使用IgnoreNulls或Composition或（有问题： Entlib5验证[IgnoreNull]抛出将对象添加到列表时出现异常）

but is there a way NOT to use IgnoreNulls or Composition.Or (have problems: Entlib5 Validation [IgnoreNull] throws exception while adding objects to list)

推荐答案

我已经解决了这个问题。我无法使用Composition，NotNull或IgnoreNull验证器。我所做的是：

I've solved this issue. I couldn't use Composition, NotNull or IgnoreNull validators. What I did is:

private string _address = string.Empty; // IMPORTANT!

[StringLengthValidator(30, "Max. 30 chars")]
public string Address {
    get { return _address; }
    set { _address = value; }
}

现在，在第一个调用字段_address不为空，它是空字符串，并且现在不需要IgnoreNulls批注。现在，StringLengthValidator仅检查地址是否为< = 30个字符。

Now, in first call field _address is not null, it's empty string and IgnoreNulls annotation is now not needed. StringLengthValidator now checks only if Address is <=30 characters.

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