datatype类必须提供类型的某种对象表示，以便验证器可用来进行相等性比较和计算散列码。

The Datatype class must provide some object representation of the type that the validator can use for equality comparison and hash code calculation.

youdao

表单验证不仅将用户名写入Cookie，它还写入信息验证码(一种来自Cookie和只有服务器知道的密值的散列形式)。

Forms authentication not only writes the user's name into the cookie, it adds a message authentication code (a hash formed from the cookie and a secret value that only the Web server knows).

youdao

表单验证不仅将用户名写入Cookie，它还写入信息验证码(一种来自Cookie和只有服务器知道的密值的散列形式)。

Forms authentication not only writes the user's name into the cookie, it adds a message authentication code (a hash formed from the cookie and a secret value that only the Web server knows).

youdao