C# 创建重复元素的 List<T> 的最短方法
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Shortest way to create a List<T> of a repeated element
提问by xyz
With the String class, you can do:
使用 String 类,您可以执行以下操作:
string text = new string('x', 5);
//text is "xxxxx"
What's the shortest way to create a List< T > that is full of n
elements which are all the same reference?
创建一个充满n
相同引用元素的 List< T > 的最短方法是什么?
采纳答案by JaredPar
Try the following
尝试以下
var l = Enumerable.Repeat('x',5).ToList();
回答by Andy_Vulhop
Fastest way I know is:
我知道的最快方法是:
int i = 0;
MyObject obj = new MyObeject();
List<MyObject> list = new List<MyObject>();
for(i=0; i< 5; i++)
{
list.Add(obj);
}
which you can make an extention method if you want to use it multiple times.
如果您想多次使用它,您可以制作一个扩展方法。
public void AddMultiple(this List<T> list, T obj, int n)
{
int i;
for(i=0;i<n;i++)
{
list.Add(obj);
}
}
Then you can just do:
然后你可以这样做:
List<MyObject> list = new List<MyObject>();
MyObject obj = new MyObject();
list.AddMultiple(obj, 5);
回答by JP Alioto
This seems pretty straight-forward ...
这看起来很简单......
for( int i = 0; i < n; i++ ) { lst.Add( thingToAdd ); }
:D
:D