C# |删除集合指定索引处的元素
原文:https://www . geesforgeks . org/c-sharp-remove-element-at-specified-index-of-collection/
收藏。RemoveAt(Int32) 用于移除集合< T** >中指定索引处的元素。
语法:
public void RemoveAt (int index);
这里， *索引* 是要移除的元素的从零开始的索引。
异常:如果指标小于零T9】或 T11指标等于或大于 Count，此方法将给出T3【argumentout of range Exception】T5。**
下面给出了一些例子，以便更好地理解实现:
例 1:
// C# code to remove the element
// at the specified index of the Collection
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
class GFG {
// Driver code
public static void Main()
{
// Creating a collection of strings
Collection<string> myColl = new Collection<string>();
// Adding elements in Collection myColl
myColl.Add("A");
myColl.Add("B");
myColl.Add("C");
myColl.Add("D");
myColl.Add("E");
// To print the count of elements in Collection
Console.WriteLine("Count : " + myColl.Count);
// Displaying the elements in myColl
foreach(string str in myColl)
{
Console.WriteLine(str);
}
// Removing the element at the
// specified index of the Collection
myColl.RemoveAt(2);
// To print the count of elements in Collection
Console.WriteLine("Count : " + myColl.Count);
// Displaying the elements in myColl
foreach(string str in myColl)
{
Console.WriteLine(str);
}
}
}
输出:
Count : 5
A
B
C
D
E
Count : 4
A
B
D
E
例 2:
// C# code to remove the element
// at the specified index of the Collection
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
class GFG {
// Driver code
public static void Main()
{
// Creating a collection of ints
Collection<int> myColl = new Collection<int>();
// Adding elements in Collection myColl
myColl.Add(2);
myColl.Add(3);
myColl.Add(4);
myColl.Add(5);
// To print the count of elements in Collection
Console.WriteLine("Count : " + myColl.Count);
// Displaying the elements in myColl
foreach(int i in myColl)
{
Console.WriteLine(i);
}
// Removing the element at the
// specified index of the Collection
// This should raise "ArgumentOutOfRangeException"
// as the index is less than 0
myColl.RemoveAt(-4);
// To print the count of elements in Collection
Console.WriteLine("Count : " + myColl.Count);
// Displaying the elements in myColl
foreach(int i in myColl)
{
Console.WriteLine(i);
}
}
}
运行时错误:
未处理异常: 系统。ArgumentOutOfRangeException:索引超出范围。必须是非负的，并且小于集合的大小。 参数名称:索引
注:此方法为 O(n)运算，其中 n 为 Count。
参考:
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