Visual Studio. NET phiên bản (hoặc mới hơn) sẽ tự động thêm một tham chiếu đến thư viện . Trong trường hợp đó, bạn có thể không cần thêm một tham chiếu đến thư viện. Hình . Các không gian tên trong một dự án | This document was created by an unregistered ChmMagic please go to http to register it. Thanks 5. Go to the Solution Explorer window and expand the References node. The namespace is listed there Figure 27 . Figure . The namespace in a project Note Visual Studio .NET version or later automatically adds a reference to the library. In that case you may not need to add a reference to the library. 6. After adding a reference to you must import and other related namespaces depending on the classes your application will use. For now we will import the and namespaces. We add the following two lines to the top of our class using using You can also qualify a namespace reference by directly adding it as a prefix of the class. For example if you don t want to use the using statements defined here you can define a class as follows g This document was created by an unregistered ChmMagic please go to http to register it. Thanks Note If you create a Windows application using only the line using needs to be written because using will already be there. Getting a Graphics Object in an Application After adding a GDI library reference to the project the next step is to decide on a drawing surface. In a Windows application a form is a drawing surface. Every form has a Graphics object associated with it which provides the drawing functionality. In the .NET Framework the Graphics class represents a GDI Graphics object which defines methods and properties to draw and fill graphics objects. Whenever an application needs to draw anything it must go through the Graphics object. Caution There is no way to create a Graphics object using thenew operator. For example if you write the following code you will .
