String + operations and stringbuilder objects

You are used to writing STR + = "XXX" in the C # code. Note that if this operation is performed many times for a single variable, it is likely to cause performance degradation.

We all know the difference between string and stringbuilder. I will not talk about it here. Let's take a look at the example and let's take a look:

Test the common string to perform 5 W overlay operations vs stringbuilder to perform 5 W append operations:

As you can see, it takes 67 seconds for the normal string operation (my dual-core CPU), and stringbuilder is 0.04 seconds ....

Check whether the string will be recycled. As shown in the figure, GC. Collect recycles the string object caused by these 5 million operations.

It was really shocked by the string...

Download Code