c# – StringBuilder真的比Aggreggate快吗？

string c = tmpArr[0].Aggregate(string.Empty,(current,m) => current + (m.Name + " "));

        StringBuilder sb = new StringBuilder();

        foreach (Mobile m in tmpArr[0])
            sb.Append(m.Name + " ");

        sb.ToString();

哪两个更快？聚合肯定是更干净,但它是快速还是与做的一样

foreach(Mobile m in tmpArr[0])
    c += m.Name + " ";

我真正想做的是像string.Join(“,”,tmpArr [0]),但我不希望它连接他们的ToString值,只是他们的名字,我怎么能做到最好？

我没有使用string.Join的问题是我实际上必须做这样的事情：

string separator = "";
        StringBuilder sb = new StringBuilder();

        foreach (Mobile m in tmpArr[0])
        {
            separator = ",";
            sb.Append(separator + m.Name);
        }

解决方法

I don’t want it to concat their ToString values,just their Names,how would I do that best?

string.Join(",",tmpArr[0].Select(t => t.Name).ToArray())

但大多数时间是It. Just. Doesn’t. Matter!