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Asked: 2026-05-10T14:33:23+00:00

Is the return value of GetHashCode() guaranteed to be consistent assuming the same string

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Is the return value of GetHashCode() guaranteed to be consistent assuming the same string value is being used? (C#/ASP.NET)

I uploaded my code to a server today and to my surprise I had to reindex some data because my server (win2008 64-bit) was returning different values compared to my desktop computer.

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  1. If I’m not mistaken, GetHashCode is consistent given the same value, but it is NOT guaranteed to be consistent across different versions of the framework.

    From the MSDN docs on String.GetHashCode():

    The behavior of GetHashCode is dependent on its implementation, which might change from one version of the common language runtime to another. A reason why this might happen is to improve the performance of GetHashCode.

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