Dictionary<string, List<DisplayAllQuestionsTable>> tPages= new Dictionary<string, List<DisplayAllQuestionsTable>>();;
List<DisplayAllQuestionsTable> threadsByTopic = new List<DisplayAllQuestionsTable>();
int tPage=0;
foreach (var topicKeys in postsByTopic)
{
if (topicKeys.Key == subTopic)
{
foreach (var item in postsByTopic[topicKeys.Key])
{
questionNumber++;
maximumTopicPages++;
threadsByTopic.Add(item);//Adds All DisplayAllTables objects
//if there are 20 add a button.
if (maximumTopicPages == 20)
{
tPages.Add(tPage.ToString(), threadsByTopic);//The threadsByTopic clears everytime i call threadsByTopic.clear()
threadsByTopic.Clear();
tPage++;
}
}
我知道如果它是引用,它的引用将按值传递。但是,如果我将threadByTopic列表添加到字典..它保存原样...?还是必须重置?
答案 0 :(得分:1)
实例被添加到字典中,但它仍然是相同的列表,因此当你使用clear u时,清除你刚刚添加的列表。你应该使用clear来创建新的列表对象。