資料結構
網路
RDBMS
作業系統
Java
MS Excel
iOS
HTML
CSS
Android
Python
C 程式設計
C++
C#
MongoDB
MySQL
Javascript
PHP
物理學
化學
生物學
數學
英語
經濟學
心理學
社會科學
時尚研究
法律研究搜尋 C# Collection 中指定物件的索引
要搜尋 Collection 中指定物件的索引，程式碼如下 −
舉例
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 specific object Electronics? = "+strCol.IndexOf("Electronics"));
}
}輸出
將產生以下輸出 −
StringCollection elements... Accessories Books Electronics Books StringCollection elements...UPDATED Accessories Books Headphone Electronics Books Index of specific object Electronics? = 3
舉例
現在，讓我們看另一個示例 −
using System;
using System.Collections.Specialized;
public class Demo {
public static void Main() {
StringCollection stringCol = new StringCollection();
String[] arr = new String[] { "100", "200", "300", "400", "500" };
Console.WriteLine("Array elements...");
foreach (string res in arr) {
Console.WriteLine(res);
}
stringCol.AddRange(arr);
Console.WriteLine("Does the specified string is in the StringCollection? = "+stringCol.Contains("800"));
Console.WriteLine("Total number of elements = "+stringCol.Count);
Console.WriteLine("Iterating through StringCollection = "+stringCol.Count);
StringEnumerator myenum = stringCol.GetEnumerator();
while (myenum.MoveNext())
Console.WriteLine(myenum.Current);
Console.WriteLine("Index of specific object 500? = "+stringCol.IndexOf("500"));
Console.WriteLine("Index of specific object 1000? = "+stringCol.IndexOf("1000"));
}
}輸出
將產生以下輸出 −
Array elements... 100 200 300 400 500 Does the specified string is in the StringCollection? = False Total number of elements = 5 Iterating through StringCollection = 5 100 200 300 400 500 Index of specific object 500? = 4 Index of specific object 1000? = -1
更新於： 2019-12-16
114 次瀏覽
廣告