C#如何从数组中删除一个元素 [英] How to delete an element from an array in C#

问题描述

假设我有这个数组，

int[] numbers = {1, 3, 4, 9, 2};

如何通过名称"删除元素?，让我们说数字 4?

How can I delete an element by "name"? , lets say number 4?

连ArrayList都没有帮助删除?

string strNumbers = " 1, 3, 4, 9, 2";
ArrayList numbers = new ArrayList(strNumbers.Split(new char[] { ',' }));
numbers.RemoveAt(numbers.IndexOf(4));
foreach (var n in numbers)
{
    Response.Write(n);
}

推荐答案

如果你想删除 4 的所有实例而不需要知道索引:

LINQ:(.NET Framework 3.5)

LINQ: (.NET Framework 3.5)

int[] numbers = { 1, 3, 4, 9, 2 };
int numToRemove = 4;
numbers = numbers.Where(val => val != numToRemove).ToArray();

非 LINQ:(.NET Framework 2.0)

Non-LINQ: (.NET Framework 2.0)

static bool isNotFour(int n)
{
    return n != 4;
}

int[] numbers = { 1, 3, 4, 9, 2 };
numbers = Array.FindAll(numbers, isNotFour).ToArray();

如果您只想删除第一个实例:

LINQ:(.NET Framework 3.5)

LINQ: (.NET Framework 3.5)

int[] numbers = { 1, 3, 4, 9, 2, 4 };
int numToRemove = 4;
int numIndex = Array.IndexOf(numbers, numToRemove);
numbers = numbers.Where((val, idx) => idx != numIndex).ToArray();

非 LINQ:(.NET Framework 2.0)

Non-LINQ: (.NET Framework 2.0)

int[] numbers = { 1, 3, 4, 9, 2, 4 };
int numToRemove = 4;
int numIdx = Array.IndexOf(numbers, numToRemove);
List<int> tmp = new List<int>(numbers);
tmp.RemoveAt(numIdx);
numbers = tmp.ToArray();

以防万一您还没有弄清楚，正如 Malfist 指出的那样，您需要以 .NET Framework 3.5 为目标，以便LINQ 代码示例工作.如果您的目标是 2.0，则需要参考非 LINQ 示例.

Just in case you hadn't already figured it out, as Malfist pointed out, you need to be targetting the .NET Framework 3.5 in order for the LINQ code examples to work. If you're targetting 2.0 you need to reference the Non-LINQ examples.

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