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object, the Validation block will, by default, apply all rules that have no name (effectively, rules with an empty string as the name) that it can find in configuration, attributes, and self-validation. If you have specified one rule set in configuration as the default rule set for the type you are validating (by setting the DefaultRule property for that type to the rule set name), rules within this rule set are also treated as being members of the default (unnamed) rule set. The one time that this default mechanism changes is if you create a validator for a type using a facade other than ValidatorFactory. As you ll see later in this chapter you can use the ConfigurationValidatorFactory, AttributeValidatorFactory, or Validation AttributeValidatorFactory to generate type validators. In this case, the validator will only apply rules that have the specified name and exist in the specified location. For example, when you use a ConfigurationValidatorFactory and specify the name MyRuleset as the rule set name when you call the CreateValidator method, the validator you obtain will only process rules it finds in configuration that are defined within a rule set named MyRuleset for the target object type. If you use an AttributeValidator Factory, the validator will only apply Validation block rules located in attributes and self-validation methods of the target class that have the name MyRuleset. Configuring multiple rule sets for the same type is useful when the type you need to validate is a primitive type such as a String. A single application may have dozens of different rule sets that all target String.
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If you do not specify a rule set name when you create a validator for an
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In the remainder of this chapter, we ll show you in more detail how you can use the features of the Validation block you have seen in previous sections. In this section, we cover three topics that you should be familiar with when you start to use the block in your applications: preparing your application to use the block, choosing a suitable approach for validation, the options available for creating validators, accessing and displaying validation errors, and understanding how you can use template tokens in validation messages. To use the Validation block, you must reference the required assemblies. In addition to the assemblies required in every application that uses Enterprise Library (listed in 1, Introduction ), you require the main Validation block assembly, Microsoft.Practices. EnterpriseLibrary.Validation.dll. If you intend to use the integration features for ASP. NET, Windows Forms, WPF, or WCF, you must also reference the relevant assembly that contains these features. Then you can edit your code to specify the namespaces used by the Validation block and, optionally, the integration features if you need to integrate with WCF or a UI technology. If you are using WCF integration, you should add a reference to the System.Service Model namespace.
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Before you start to use the Validation block, you should consider how you want to perform validation. As you ve seen, there are several approaches you can follow. Table 2 summarizes these, and will help you to choose one, or a combination, most suited to your requirements.
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table 2 Validation approaches Validation approach Rule sets in configuration Advantages Supports the full capabilities of the Validation block validators. Validation rules can be changed without requiring recompilation and redeployment. Validation rules are more visible and easier to manage. Validation block attributes Supports the full capabilities of the Validation block validators. Validation attributes may be defined in separate metadata classes. Rules can be extracted from the metadata for a type by using reflection. Data annotation attributes Allows you to apply validation rules defined by .NET data annotation attributes, which may be defined in separate metadata classes. Typically used with technologies such as LINQ, for which supporting tools might be used to generate code. Technologies such as ASP.NET Dynamic Data that use these attributes can perform partial client-side validation. Rules can be extracted from the metadata for a type by using reflection. Self-validation Allows you to create custom validation rules that may combine values of different members of the class. Requires modification of the source code. Hides validation rules from administrators and operators. Rules cannot be extracted from the metadata for a type by using reflection. Validators created programmatically Requires additional code and is generally more difficult to manage for complex Useful if you only need to perform small validation scenarios. Hides validation rules from administrators and specific validation tasks, especially and operators. on value types held in variables. A simple way to validate individual values as well as entire objects. More difficult to administer and manage. Considerations Rules are visible in configuration files unless the content is encrypted. May be open to unauthorized alteration if not properly protected. Type definitions and validation rule definitions are stored in different files and accessed using different tools, which can be confusing. Requires modification of the source code of the types to validate. Some complex rule combinations may not be possible only a single And or Or combination is available for multiple rules. Hides validation rules from administrators and operators. Requires modification of the source code. Does not support all of the powerful validation capabilities of the Validation block.
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