如何删除添加到列表中的最后一个元素? [英] How to remove the last element added into the List?

问题描述

我在 c# 中有一个列表，我在其中添加列表字段.现在添加时我必须检查条件，如果条件满足，则我需要从列表中删除添加的最后一行.这是我的示例代码..

I have a List in c# in which i am adding list fields.Now while adding i have to check condition,if the condition satisfies then i need to remove the last row added from the list. Here is my sample code..

    List<> rows = new List<>();
    foreach (User user in users)
    {
        try
        {
            Row row = new Row();
            row.cell = new string[11];
            row.cell[1] = user."";
            row.cell[0] = user."";
            row.cell[2] = user."";         

            rows.Add(row);

            if (row.cell[0].Equals("Something"))
            {

                //here i have to write code to remove last row from the list
                //row means all the last three fields

            }

        }

所以我的问题是如何从 C# 中的列表中删除最后一行.请帮帮我.

So my question is how to remove last row from list in c#. Please help me.

推荐答案

这个问题的直接答案是:

The direct answer to this question is:

if(rows.Any()) //prevent IndexOutOfRangeException for empty list
{
    rows.RemoveAt(rows.Count - 1);
}

注意: 从 c#8.0 开始，您可以使用 rows.RemoveAt(^1) 而不是 rows.RemoveAt(rows.Count - 1).

Note: Since c#8.0 you can use rows.RemoveAt(^1) instead of rows.RemoveAt(rows.Count - 1).

然而...在这个问题的具体情况下，首先不添加行更有意义:

However... in the specific case of this question, it makes more sense not to add the row in the first place:

Row row = new Row();
//...      

if (!row.cell[0].Equals("Something"))
{
    rows.Add(row);
}

TBH，我会更进一步，针对 user."" 测试 "Something"，甚至不实例化 Row 除非满足条件，但作为 user."" 将无法编译，我将其留给读者作为练习.

TBH, I'd go a step further by testing "Something" against user."", and not even instantiating a Row unless the condition is satisfied, but seeing as user."" won't compile, I'll leave that as an exercise for the reader.

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