The gethashcode method does not guarantee that the value is unique.

When I used the word segmentation module, I assigned hashcode to each word, but found that its value is not unique;
For example, the values of "public egress" and "Antique" are both 6237203.

Why is there such a problem? In fact, there is an explanation in msdn:

Remarks

GethashcodeThe behavior depends on its implementation, which may be changed from a public Language Runtime Library version to another version. The reason may be to improveGethashcodePerformance. If requiredGethashcodeThe behavior remains unchanged. Please use your own, sure not to change the implementation to rewriteGethashcode.

That's right, because he used different methods to optimize the speed.Algorithm, Resulting in the emergence of the same value, the solution is as he said, write a fixed algorithm.

If you have used this method before, you have to change it.