Question

嗨我有这样的代码

List<CQuizOccurrence> matchData = new List<CQuizOccurrence>();
foreach (CQuizOccurrence myQuizOccurrence in Global.quizOccurrences) 
{
    DateTime dtDatabase = (DateTime)myQuizOccurrence.occurred;
    string dt = dtDatabase.ToString();
    if (dt == dateOccur) {
        matchData.Add(myQuizOccurrence);
    }
}

foreach (CQuizOccurrence myQuizOccurrence in matchData)
{
    Global.quizOccurrences.RemoveAt(0);
}

我认为该代码将能够 删除'global = quizOccurences'数据'dt == dateOccur' ，但我错了，它只是简单地删除' Global.quizOccurences'，索引为0

如何按照我的意愿纠正它（斜体和粗体文字）

Answer 1

RemoveAt()删除指定索引处的项目。在您的情况下，您需要删除符合特定条件的项目，而不是列表开头的项目。

var itemsToRemove = Global.quizOccurrences
    .Where(q => q.occurred.ToString() == dateOccur)
    .ToList();

foreach(var quizOccurrence in itemsToRemove)
{
    Global.quizOccurrences.Remove(quizOccurrence);
}

Answer 2

尝试更改此行：

Global.quizOccurrences.RemoveAt(0);

到此：

Global.quizOccurrences.Remove(myQuizOccurrence);

删除列表数据foreach

2 个答案: