tailieunhanh - Referencing the Type Libraries

Tham khảo các Thư viện Type Trước khi nhìn thấy làm thế nào để sử dụng các bộ sưu tập và các đối tượng, bạn cần phải biết làm thế nào để tham khảo các thư viện mô hình đối tượng để sử dụng. Các mô hình đối tượng được tìm thấy trong các thư viện loại trong hệ thống tập tin | Referencing the Type Libraries Before seeing how to use these collections and objects you need to know how to reference the object model libraries for use. The object models are found in type libraries in the file system. A type library contains the information about the object models such as the collections properties and methods. Referencing the type libraries isn t difficult but it is still very important. Because Visual Basic .NET uses by default you will have to reference all the object models you are going to need. To reference the object models choose Add Reference from Visual Studio .NET s Project menu. After you re in the Add Reference dialog box click on the COM tab. You then have to find the type libraries for the object models and select them. The type library name that you will be using is as follows Microsoft ActiveX Data Objects Library. This is also referred to as the ADODB object model. You can see this library as well as other Microsoft ActiveX Data Objects Libraries in Figure . Figure . Registering the COM type libraries. Tip You can use both ADO libraries and classes in the same application without worrying about the order of libraries in the references. This is great when you re converting applications from ADO to . To use all libraries and not worry about the order of reference you must prefix your objects with the library with which they come. Here are some examples with the specific library types Dim odaTest as Dim rstTestADO as Dim catTest as Although not all objects are shared between the libraries it s a good idea to specify the library while you re getting used to the objects. After the library has been selected you can see the ADODB reference entry in the Solution Explorer under .