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As you can see,indexers behave much like a custom collection supporting the IEnumeratorand IEnumerableinterfaces in that they provide access to a container’s subitems. The major difference ofcourse is that rather than accessing the contents using the foreachconstruct, you are able to manipulate the internal collection of sub-objects just like a standardarray. Now for the big question: How do you configure the PeopleCollectionclass (or any class/ structure) to support this functionality? An indexer is represented as a slightly mangled C# property. Inits simplest form, an indexer is created using the this[]syntax. Hereis the required update for the PeopleCollectionclass:

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// Console.WriteLine(cs[9]); 类似这样的问题 这种翁提劝解； 适合初学者

static void gettoken() { token.Remove(0, token.Length); char c = prog[i]; while (c == ' '){ i++; c=prog[i]; } if (c == '+'|| c == '-' || c == '*' || c == '/') { token_t = DILIM; token.Append(c); ++i; } else if (c > '0' && c < '9') { token_t = NUM; while (c > '0'&& c < '9') { token.Append(c); if (i >= prog.Length-1) { return; } else { c = prog[++i]; } } } else { token_t = ERR; } } static void arith(char op, ref float r, float h) { switch (op) { case '+': r = r + h; break; case '-': r = r - h; break; case '*': r = r * h; break; case '/': r = r / h; break; } } static void lev1(ref float r) { char op; float h=0F; gettoken(); lev2(ref r); op = token[0]; while (op == '+' || op == '-') { gettoken(); lev2(ref h); arith(op, ref r, h); gettoken(); //gettoken(); // arith(op, ref r, h); op = token[0]; } } static void lev2(ref float r) { char op; float h; String s = token.ToString(); r=float.Parse (s); gettoken(); op = token[0]; while ((op == '*') ||( op == '/')) { gettoken(); s = token.ToString(); h=float.Parse (s); arith(op, ref r, h); gettoken(); op = token[0]; } } } }

static void gettoken() { token.Remove(0, token.Length); char c = prog[i]; while (c == ' '){ i++; c=prog[i]; } if (c == '+'|| c == '-' || c == '*' || c == '/') { token_t = DILIM; token.Append(c); ++i; } else if (c > '0' && c '0'&& c = prog.Length-1) { return; } else { c = prog[++i]; } } } else { token_t = ERR; } } static void arith(char op, ref float r, float h) { switch (op) { case '+': r = r + h; break; case '-': r = r - h; break; case '*': r = r * h; break; case '/': r = r / h; break; } } static void lev1(ref float r) { char op; float h=0F; gettoken(); lev2(ref r); op = token[0]; while (op == '+' || op == '-') { gettoken(); lev2(ref h); arith(op, ref r, h); gettoken(); //gettoken(); // arith(op, ref r, h); op = token[0]; } } static void lev2(ref float r) { char op; float h; String s = token.ToString(); r=float.Parse (s); gettoken(); op = token[0]; while ((op == '*') ||( op == '/')) { gettoken(); s = token.ToString(); h=float.Parse (s); arith(op, ref r, h); gettoken(); op = token[0]; } } } }

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Ⅰ部分 C# 语 言 第1章 .NET体系结构.... 3 1.1 C#与.NET的关系...... 3 1.2 公共语言运行库...... 3 1.3 详细介绍中间语言...... 6 1.3.1 面向对象和接口的支持..... 7 1.3.2 相异值类型和引用类型..... 8 1.3.3 强数据类型..... 8 1.3.4 通过异常方法处理错误..... 14 1.3.5 特性的使用..... 14 1.4 程序集...... 14 1.4.1 私有程序集..... 15 1.4.2 共享程序集..... 16 1.4.3 反射..... 16 1.5 .NET Framework类...... 16 1.6 命名空间...... 17 1.7 用C#创建.NET应用程序...... 18 1.7.1 创建ASP.NET应用程序..... 18 1.7.2 创建Windows窗体..... 20 1.7.3 Windows控件..... 20 1.7.4 Windows服务..... 20 1.8 C#在.NET企业体系结构中 的作用...... 20 1.9 小结...... 22 第2章 C#基础.... 23 2.1 引言...... 23 2.2 第一个C#程序...... 23