c# library 之 代码库

需要测试时间的代码

System.Diagnostics.Stopwatch stopwatch = new System.Diagnostics.Stopwatch();
stopwatch.Start();//  开始监视代码运行时间
#region
需要测试的代码
#endregion
stopwatch.Stop();//  停止监视
TimeSpan timeSpan = stopwatch.Elapsed;//  获取当前实例测量得出的总时间
double seconds = timeSpan.TotalSeconds;
Console.WriteLine("文件读取的总秒数为：{0}", seconds);

键值对数据排序

//1.使用排序字典，默认只支持升序 
SortedDictionary<DateTime, String> dd = new SortedDictionary<DateTime, String>(); 
DateTime dt = DateTime.Now; 
dd.Add(dt, "bbb"); 
dd.Add(dt.AddDays(-1), "ccc"); 
dd.Add(dt.AddDays(1), "aaa"); 
//可以借助List得到降序键或值 
List<String> lst = new List<String>(dd.Values); 
lst.Reverse(); 

//2使用Linq查询 
Dictionary<DateTime, String> dd = new Dictionary<DateTime, String>(); 
DateTime dt = DateTime.Now; 
dd.Add(dt, "bbb"); 
dd.Add(dt.AddDays(-1), "ccc"); 
dd.Add(dt.AddDays(1), "aaa"); 
 
var result = from pair in dd orderby pair.Key descending select pair; 
List<String> lst = new List<String>(); 
foreach (var kv in result) 
{ 
    lst.Add(kv.Value); 
} 
//或 
Dictionary<DateTime, String> dd2 = result.ToDictionary(p=>p.Key, p=>p.Value); 

//3.使用扩展方法  
Dictionary<DateTime, String> dd = new Dictionary<DateTime, String>();  
DateTime dt = DateTime.Now;  
dd.Add(dt, "bbb");  
dd.Add(dt.AddDays(-1), "ccc");  
dd.Add(dt.AddDays(1), "aaa");  
  
Dictionary<DateTime, String> dicAsc = dd.OrderBy(p=>p.Key).ToDictionary(p=>p.Key, p=>p.Value);  
Dictionary<DateTime, String> dicDesc = dd.OrderByDescending(p=>p.Key).ToDictionary(p=>p.Key, p=>p.Value);

文件读写

//写
StreamWriter log = new StreamWriter(@"E:\wli\send.txt");
//重点是FileAccess为写入模式。
FileStream fsw = new FileStream(@"E:\wli\tmp.zip", FileMode.OpenOrCreate,FileAccess.Write);
//读
FileStream fs = new FileStream(@"E:\wli\mdl_3_4_0.zip", FileMode.OpenOrCreate);