你如何串连在C＃名单？ [英] How do you concatenate Lists in C#?

问题描述

如果我有：

List<string> myList1;
List<string> myList2;
int placeToCheckValues = 0; //Used for breakpoints since the values don't get updated until after the line is executed

myList1 = getMeAList();
placeToCheckValues = 0;    //Checked myList1 here, it contains 4 strings

myList2 = getMeAnotherList();
placeToCheckValues = 0;    //Checked myList2 here, it contains 6 strings

myList1.Concat(myList2);
placeToCheckValues = 0;    //Checked mylist1 again, it contains 4 strings... why?

我跑在Visual Studio 2008和每个执行后，设置断点与此类似code。后 myList1 = getMeAList（）; ， myList1 包含四个字符串，我pressed的加号按钮，使确保他们不都是空值。

I ran code similar to this in Visual Studio 2008 and set break points after each execution. After myList1 = getMeAList();, myList1 contains four strings, and I pressed the plus button to make sure they weren't all nulls.

在 myList2 = getMeAnotherList（）; ， myList2 包含六弦，我检查，以确保他们间没有T空...后 myList1.Concat（myList2）; myList1只包含四根弦。这是为什么？

After myList2 = getMeAnotherList();, myList2 contains six strings, and I checked to make sure they weren't null... After myList1.Concat(myList2); myList1 contained only four strings. Why is that?

推荐答案

的毗连返回一个新序列的而不修改原始列表。尝试 myList1.AddRange（myList2）。

Concat returns a new sequence without modifying the original list. Try myList1.AddRange(myList2).

这篇关于你如何串连在C＃名单？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！