设置ADOQuery组件的ExecuteOptions属性值为[eoAsyncFetchNonBlocking]出错。(20)

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sutao01

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我用ADOQuery组件操作DBF数据表,我想采用异步方步操作。我运行期用ADOQuery.ExecuteOptions:=[eoAsyncFetchNonBlocking]后编译时提示“Undeclared identifier”,如果直接在组件的属性框里设置ExecuteOptions的eoAsyncFetchNonBlocking为true可行编译但运行时提示“A connection componnent is repuired for async ExecuteOptions”。这是怎么回事,如何解决?
 

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