Question

Looking at the string class metadata, I only see the operators == and != overloaded. So how is it able to perform concatenation for the + operator?

http://www.ohchr.org。

Some interesting notes from Eric Lippert on string concatenation:

http://ericfallert.com/06/17/string-concatenation-behind-the-scenes-part-one/>Part 1

http://ericfallert.com/06/24/string-connation-behind-the-scenes-part-second/>Part 2

第2部分还提到了Joel的一篇文章(http://www.joelonsoftware.com/articles/fog0000319.html )。

Answer 1

(C#汇编者:)

因此,该法典:

string x = "hello";
string y = "there";
string z = "chaps";
string all = x + y + z;

实际编辑如下:

string x = "hello";
string y = "there";
string z = "chaps";
string all = string.Concat(x, y, z);

(Gah-Inter edit 意外去除其他比目)

C#汇编者指出,这里有多种缩略语,其好处是,你不会最终形成一个中层的<代码>x+ y,然后作为<代码>(x + y)和的分类的一部分,再加以复制。相反,我们一劳永逸。



EDIT: Note that the compiler can t do anything if you concatenate in a loop. For example, this code:

string x = "";
foreach (string y in strings)
{
    x += y;
}


just ends up as equivalent to:

string x = "";
foreach (string y in strings)
{
    x = string.Concat(x, y);
}

......因此,does产生大量垃圾,因此,你应使用StringBuilder处理此类案件。 我有,其中涉及两个的更多细节,希望能回答进一步的问题。

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