1.新建Window窗体项目GZDBHelperDemo 2.从Nuget添加GZDBHelper引用 添加完成后会出现GZDBHelper的引用 3.添加数据库链接管理类 添加类库文件:DatabaseFactoryEx.cs public class DatabaseFactoryEx { private static GZDBHelper.IDatabase db; public static GZDBHelper.IDatabase CreateDatabase() { if (db =…