从C#中的Collection中删除第一次出现的对象
要从Collection中删除对象的第一次出现，代码如下-
示例
using System;
using System.Collections.ObjectModel;
public class Demo {
public static void Main(){
Collection<string> col = new Collection<string>();
col.Add("Andy");
col.Add("Kevin");
col.Add("John");
col.Add("Nathan");
col.Add("Nathan");
col.Add("Katie");
col.Add("Barry");
col.Add("Nathan");
col.Add("Mark");
Console.WriteLine("Count of elements = "+ col.Count);
Console.WriteLine("Iterating through the collection...");
var enumerator = col.GetEnumerator();
while (enumerator.MoveNext()) {
Console.WriteLine(enumerator.Current);
}
col.Remove("Nathan");
Console.WriteLine("Count of elements (updated) = "+ col.Count);
Console.WriteLine("Iterating through the collection... (updated)");
enumerator = col.GetEnumerator();
while (enumerator.MoveNext()) {
Console.WriteLine(enumerator.Current);
}
}
}输出结果
这将产生以下输出-
Count of elements = 9 Iterating through the collection... Andy Kevin John Nathan Nathan Katie Barry Nathan Mark Count of elements (updated) = 8 Iterating through the collection... (updated) Andy Kevin John Nathan Katie Barry Nathan Mark
示例
让我们看另一个例子-
using System;
using System.Collections.ObjectModel;
public class Demo {
public static void Main(){
Collection<string> col = new Collection<string>();
col.Add("One");
col.Add("Two");
col.Add("Two");
col.Add("Four");
col.Add("Five");
col.Add("Two");
col.Add("Six");
col.Add("Seven");
Console.WriteLine("Count of elements = "+ col.Count);
Console.WriteLine("Iterating through the collection...");
var enumerator = col.GetEnumerator();
while (enumerator.MoveNext()) {
Console.WriteLine(enumerator.Current);
}
col.Remove("Two");
Console.WriteLine("Count of elements = "+ col.Count);
Console.WriteLine("Iterating through the collection... (updated)");
enumerator = col.GetEnumerator();
while (enumerator.MoveNext()) {
Console.WriteLine(enumerator.Current);
}
}
}输出结果
这将产生以下输出-
Count of elements = 8 Iterating through the collection... One Two Two Four Five Two Six Seven Count of elements = 7 Iterating through the collection... (updated) One Two Four Five Two Six Seven