C#编程建议1：正确操作字符串
- using System;
- using System.Collections.Generic;
- using System.Linq;
- using System.Text;
- namespace Tip1
- {
- class Program
- {
- static void Main(string[] args)
- {
- }
- private static void NewMethod1()
- {
- string s1 = "abc";
- s1 = "123" + s1 + "456"; //以上两行代码创建了3个
- //字符串对象，并执行了一次string.Contact方法
- }
- private static void NewMethod6()
- {
- string re6 = 9 + "456"; //该代码发生一次装箱，并调
- //用一次string.Contact方法
- }
- private static void NewMethod2()
- {
- string re2 = "123" + "abc" + "456"; //该代码等效于
- //string re2 = "123abc456";
- }
- private static void NewMethod9()
- {
- const string a = "t";
- string re1 = "abc" + a; //因为a是一个常量，所以
- //该代码等效于 string re1 = "abc" + "t";
- //最终等效于string re1 = "abct";
- }
- private static void NewMethod8()
- {
- string a = "t";
- a += "e";
- a += "s";
- a += "t";
- }
- private static void NewMethod7()
- {
- string a = "t";
- string b = "e";
- string c = "s";
- string d = "t";
- string result = a + b + c + d;
- }
- private static void NewMethod10()
- {
- //为了演示必要，定义了4个变量
- string a = "t";
- string b = "e";
- string c = "s";
- string d = "t";
- StringBuilder sb = new StringBuilder(a);
- sb.Append(b);
- sb.Append(c);
- sb.Append(d);
- //再次提示，是运行时，所以没有使用下面的代码
- //StringBuilder sb = new StringBuilder("t");
- //sb.Append("e");
- //sb.Append("s");
- //sb.Append("t");
- string result = sb.ToString();
- }
- private static void NewMethod11()
- {
- //为了演示必要，定义了4个变量
- string a = "t";
- string b = "e";
- string c = "s";
- string d = "t";
- string.Format("{0}{1}{2}{3}", a, b, c, d);
- }
- }
- }
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