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法律研究搜索 C# Collection 中指定对象的索引
要搜索 Collection 中指定对象的索引，代码如下 −
举例
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"));
}
}输出
将产生以下输出 −
StringCollection elements... Accessories Books Electronics Books StringCollection elements...UPDATED Accessories Books Headphone Electronics Books Index of specific object Electronics? = 3
举例
现在，让我们看另一个示例 −
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"));
}
}输出
将产生以下输出 −
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
更新于： 2019-12-16
114 次浏览
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