标签：接口 lis names div inter write 字符串 重载 mes
1. c# 索引器（indexer）
using System; using System.IO; namespace IO { class Program { private string[] nameList = new string[10]; static void Main(string[] args) { var names = new IndexedNames(); names[0] = "hi"; Console.WriteLine(names[0]); Console.WriteLine(names[1]); Console.WriteLine(names[11]); } class IndexedNames { private string[] nameList = new string[10]; public IndexedNames() { for (int i = 0; i < nameList.Length; i++) { nameList[i] = "N/A"; } } public string this[int index] { get { string tmp; if (index >= 0 && index < nameList.Length) { tmp = nameList[index]; } else { tmp = "index is empty"; } return tmp; } set { if(index >= 0 && index < nameList.Length) { nameList[index] = value; } } } } } }
using System; using System.IO; namespace IO { class Program { private string[] nameList = new string[10]; static void Main(string[] args) { var names = new IndexedNames(); names[0] = "hi"; Console.WriteLine(names[0]); Console.WriteLine(names[1]); Console.WriteLine(names[11]); var testStr = "hi"; Console.WriteLine(names[testStr]); } class IndexedNames { private string[] nameList = new string[10]; public IndexedNames() { for (int i = 0; i < nameList.Length; i++) { nameList[i] = "N/A"; } } public string this[int index] { get { string tmp; if (index >= 0 && index < nameList.Length) { tmp = nameList[index]; } else { tmp = "index is empty"; } return tmp; } set { if(index >= 0 && index < nameList.Length) { nameList[index] = value; } } } // 以字符串为索引，返回该字符串在数组中的整型索引，重载了索引器 public int this[string name] { get { int i = 0; while(i < nameList.Length) { if(nameList[i] == name) { return i; } } return -1; } } } } }
可为get、set 设置修饰符，一般set为private，get为public
3. 基于接口的索引器与代码强壮性
在接口内也可以新建索引器。
下方
using System; using System.IO; namespace IO { class Program { private string[] nameList = new string[10]; static void Main(string[] args) { var names = new IndexedNames(); names[0] = "hi"; Console.WriteLine(names[0]); Console.WriteLine(names[1]); Console.WriteLine(names[11]); var testStr = "hi"; Console.WriteLine(names[testStr]); } } class IndexedNames { private string[] nameList = new string[10]; public IndexedNames() { for (int i = 0; i < nameList.Length; i++) { nameList[i] = "N/A"; } } public string this[int index] { get { string tmp; if (index >= 0 && index < nameList.Length) { tmp = nameList[index]; } else { tmp = "index is empty"; } return tmp; } set { if (index >= 0 && index < nameList.Length) { nameList[index] = value; } } } // 以字符串为索引，返回该字符串在数组中的整型索引 public int this[string name] { get { int i = 0; while (i < nameList.Length) { if (nameList[i] == name) { return i; } } return -1; } } } public interface ISomeInterface { int this[int index] { get; set; } } class IndexerClass : ISomeInterface { private int[] arr = new int[100]; public int this[int index] { get { return arr[index]; } set { arr[index] = value; } } } }
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标签：接口 lis names div inter write 字符串 重载 mes
原文地址：https://www.cnblogs.com/Tanqurey/p/12259551.html
