C# 中 StringCollection 中第一次出现的索引?
获取 StringCollection 中第一次出现的索引,代码如下 −
示例
using System; using System.Collections.Specialized; public class Demo { public static void Main() { StringCollection strCol = new StringCollection(); strCol.Add("Accessories"); strCol.Add("Books"); strCol.Add("Electronics"); strCol.Add("Books"); Console.WriteLine("StringCollection elements..."); foreach (string res in strCol) { Console.WriteLine(res); } strCol.Insert(2, "Headphone"); Console.WriteLine("StringCollection elements...UPDATED"); foreach (string res in strCol) { Console.WriteLine(res); } Console.WriteLine("Index of first occurrence of Books? = "+strCol.IndexOf("Books")); } }
输出
这将产生以下输出 −
StringCollection elements... Accessories Books Electronics Books StringCollection elements...UPDATED Accessories Books Headphone Electronics Books Index of first occurrence of Books? = 1
示例
现在我们来看另一个示例 −
using System; using System.Collections.Specialized; public class Demo { public static void Main() { StringCollection strCol = new StringCollection(); String[] strArr = new String[] { "A", "B", "C", "D", "E", "F", "D", "H" }; Console.WriteLine("StringCollection elements..."); foreach (string str in strArr) { Console.WriteLine(str); } strCol.AddRange(strArr); Console.WriteLine("Element at 5th index = "+strCol[5]); Console.WriteLine("Count of strings in StringCollection = " + strCol.Count); Console.WriteLine("Index of first occurrence of D? = "+strCol.IndexOf("D")); } }
输出
这将产生以下输出 −
StringCollection elements... A B C D E F D H Element at 5th index = F Count of strings in StringCollection = 8 Index of first occurrence of D? = 3
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