C# 中 StringCollection 中首次出现的索引?
csharpserver side programmingprogramming更新于 2025/7/9 5:22:17
要获取 StringCollection 中首次出现的索引，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
现在让我们看另一个例子 −
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
