static void Main(string[] args)
{
// 指定磁盘文件位置
string treeFileName = @"E:\BPlusTree_" + DateTime.Now.ToString(@"yyyyMMddHHmmssffffff") + ".data";
Stream treeFileStream = new FileStream(treeFileName, FileMode.CreateNew, FileAccess.ReadWrite);
// 初始化 B+ 树，固定长度字符串为键，映射至长整形
int keyLength = 64;
int nodeCapacity = 2;
BPlusTree tree = BPlusTree.InitializeInStream(treeFileStream, 0L, keyLength, nodeCapacity);
// 插入 0 到 7 共 8 个键值对
for (int i = 0; i < 8; i++)
{
tree.Set(i.ToString(), (long)(i * 1000)); // Key 是字符串，Value 是 long 类型
}
// 将 B+ 树输出到命令行
Console.WriteLine(tree.ToText());
// 获取指定的键值对
Console.WriteLine();
Console.WriteLine(string.Format("Tree's first key is {0}.", tree.FirstKey()));
Console.WriteLine(string.Format("Check key {0} exists {1}.", "3", tree.ContainsKey("3")));
Console.WriteLine(string.Format("{0}'s next key is {1}.", "6", tree.NextKey("6")));
Console.WriteLine(string.Format("Get key {0} with value {1}.", "2", tree.Get("2")));
Console.WriteLine(string.Format("Index key {0} with value {1}.", "4", tree["4"]));
Console.WriteLine();
// 删除键值对
tree.RemoveKey("6");
Console.WriteLine(tree.ToText());
Console.ReadKey();
}
