How to Safely Remove Elements from a List While Iterating in C#?

Remove the list element safely when iterates in C#

Modifying the list during the iteration may cause problems, such as a headache that the "collection has been modified; the enumeration operation may not be executed" abnormal. However, some technologies can effectively remove elements during iteration.

Use for loop reverse iteration

One method is to use the for loop reverse iteration list. This can prevent the index position of destroying the collection:

Removeall method

for (int i = safePendingList.Count - 1; i >= 0; i--)
{
    // 处理元素
    // safePendingList.RemoveAt(i);
}

Another choice is to use the Removeall method with predicate to check each element:

<示> Example

safePendingList.RemoveAll(item => item.Value == someValue);

Consider the following integer list:

<除> Before removal:

var list = new List<int>(Enumerable.Range(1, 10));

Output: <<>

<除> After removal:

Console.WriteLine("移除前：");
list.ForEach(i => Console.WriteLine(i));

Output: <<>

<code>1
2
3
4
5
6
7
8
9
10</code>

This demonstrates how to remove elements greater than 5 from the list.

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