在调用模型方法进行数据操作之前发生。如果这些模型方法是在自定义类型而不是代码隐藏文件上定义的，则处理此事件。

Message in Chinese (Simplified) (中文(简体))

Unlocalized message

Occurs before model methods are invoked for data operations. Handle this event if the model methods are defined on a custom type other than the code behind file.

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Arabic (العربية) Czech (Čeština) Danish (Dansk) Dutch (Nederlands) Finnish (suomi) French (Français) German (Deutsch) Greek (Ελληνικά) Prior (Message) Hebrew (עברית) Hungarian (magyar) Italian (Italiano) Japanese (日本語) Korean (한국어) Norwegian (Bokmal) (Norsk (Bokmål)) Polish (Polski) Next (Message) Portuguese (Brazil) (Português (Brasil)) Russian (Русский) Spanish (Español) Swedish (Svenska) Turkish (Türkçe) Chinese (Traditional) (中文（繁體）)