【翻译】C#和.NET核心快速参考

int[] numArray = {1903, 1907, 1910};
int[] numArray = new int[3];
// 3行2列
int[ , ] nums = {{1907, 1990}, {1904, 1986}, {1910, 1980}};

Array.Sort(numArray); // 升序排列
// 排序开始在4位置，排序10个元素
Array.Sort(numArray, 4, 10);
// 使用一个数组作为键排序两个数组
string[] values = {“Cary”, “Gary”, “Barbara”};
string[] keys = {“Grant”, “Cooper”, “Stanwyck”};
Array.Sort(keys, values);
// 清除数组中的元素（数组元素, 第一个元素, 元素长度）
Array.Clear(numArray, 0, numArray.Length);
// 拷贝数组元素到另一个数组
Array.Copy(src, target, numelements);

StringBuilder sb=new StringBuilder();
StringBuilder sb=new StringBuilder(mystring);
StringBuilder sb=new StringBuilder(mystring,capacity);

Using StringBuilderMembers
decimal bmi = 22.2M;
int wt=168;
StringBuilder sb = new StringBuilder(“My weight is ”);
sb = sb.Append(wt); 
// 可以追加数量
sb= sb.Append(“ and my bmi is ”).Append(bmi);
// 我的重量是 168 ，我的bmi（身体质量指数）指数是 22.2
sb= sb.Replace(“22.2”,”22.4”);
string s = sb.ToString();
// 清除并设置新值
sb.Length=0;
sb.Append(“Xanadu”);

DateTime Constructor
DateTime(yr, mo, day)
DateTime(yr, mo, day, hr, min, sec)
 
DateTime bday = new DateTime(1964,12,20,11,2,0);
DateTime newyr = DateTime.Parse(“1/1/2005”);
DateTime currdt = DateTime.Now;
// also AddHours, AddMonths, AddYears
DateTime tomorrow = currdt.AddDays(1);
TimeSpan diff = currdt.Subtract(bday);
//从12/20/64 到 6/24/05 14795 天
Console.WriteLine(“{0}”, diff.Days); 
// TimeSpan(hrs, min, sec)
TimeSpan ts = new TimeSpan(6, 30, 10);
// also FromMinutes, FromHours, FromDays
TimeSpan ts = TimeSpan.FromSeconds(120);
TimeSpan ts = ts2 – ts1;  // +,-,>,<,==, !=  

CultureInfo ci = new CultureInfo("de-DE"); // 德国文化
string curdt = String.Format(ci,"{0:M}",DateTime.Now); // 29 Juni

string zipexp = @"\d{5}((-|\s)?\d{4})?$";
string addr="W.44th St, New York, NY 10017-0233";
Match m = Regex.Match(addr,zipexp); //静态方法
Regex zipRegex= new Regex(zipexp);
m= zipRegex.Match(addr); // 使用正则表达式对象
Console.WriteLine(m.Value); // 10017-0233

// (1) 定义一个委托调用方法（S）具有单个字符串参数
public delegate void StringPrinter(string s);
// (2) 注册方法通过委托调用
StringPrinter prt = new StringPrinter(PrintLower);
prt += new StringPrinter(PrintUpper);
prt(“Copyright was obtained in 2005”); / /执行PrintLower和PrintUpper
使用匿名方法与委托，而不是调用一个方法，委托封装的代码被执行：
prt = delegate(string s) { Console.WriteLine(s.ToLower()); };
prt += delegate(string s) { Console.WriteLine(s.ToUpper()); };
prt(“Print this in lower and upper case.”);

// class.event += new delegate(event handler method);
Button Total = new Button();
Total.Click += new EventHandler(GetTotal);
//事件处理程序方法必须已经指定由委托签名
private void GetTotal( object sender, EventArgs e) {}