public static public static - 1 year ago 55
C# Question

Can I depend on the values of GetHashCode() to be consistent?

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.

Answer Source

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.