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ADO WillChangeField 与 FieldCh
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The WillChangeField Event
WillChangeField事件
The WillChangeField event is triggered before the values of one or more Field Objects are changing.
WillChangeField事件是在一个或更多个的字段对象改变之前被激发。
Note: Before this event returns, set the status parameter to adStatusCancel to cancel the operation that caused this event.
注意：在返回这个事件之前，将status[状态]参数设置为adStatusCancel可以取消运行该事件的操作程序。
The FieldChangeComplete Event
FieldChangeComplete事件
The FieldChangeComplete event is triggered after the values of one or more Field Objects have been changed.
FieldChangeComplete事件是在一个或更多个字段对象被改变之后被激发的。
Note: Before this event returns, set the status parameter to adStatusUnwantedEvent to prevent subsequent notifications.
注意：在你返回这个方法之前，将status[状态]参数设置为adStatusUnwantedEvent可以阻止接下来一系列的通告提示。
Note: The WillChangeField event and the FieldChangeComplete event may occur when you set the Value property and calls the Update method with field and value array parameters.
注意：当你设置属性值并且对“字段/值（即字段对应的值）”数组参数请求Update[更新]方法时，WillChangeField事件和FieldChangeComplete事件将会被触发。
Syntax
语法
WillChangeField numfields,fields,status,objRs FieldChangeComplete numfields,fields,objErr,status,objRs |
| Parameter参数 | Description描述 |
|---|---|
| numfields | The number of Field objects in fields 指定字段集中包含的字段数量 |
| fields | An array that contains Field objects with changes 制定一个数组。该数组包含了发生改变的字段对象 |
| status | An EventStatusEnum value that indicates the status of the execution of the event 指定一个EventStatusEnum值，用于指示事件执行的状态 |
| objErr | The name of an Error object that describes the error if status is set to adStatusErrorsOccurred, otherwise it is not set 指定一个错误对象的名称。如果status[状态]设置为adStatusErrorsOccurred，那么该对象将描述具体的错误信息 |
| objRs | The name of the Recordset Object that triggered this event 指定激发该事件的记录集对象的名称 |
EventStatusEnum Values
| Constant常量 | Value值 | Description描述 |
|---|---|---|
| adStatusOK | 1 | The operation that caused the event was successful 激发事件操作成功 |
| adStatusErrorsOccurred | 2 | The operation that caused the event failed 激发事件操作失败 |
| adStatusCantDeny | 3 | The operation that caused the event cannot be cancelled 不可以取消正处于处理执行中的操作 |
| adStatusCancel | 4 | The operation that caused the event is cancelled 取消激发事件的操作 |
| adStatusUnwantedEvent | 5 | Prevents subsequent notifications before the event method has finished executing 在时间的运行方法终止运行之前禁止后续的报告 |
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