Runtime: Performance of LINQ .Any() - type check to leverage .Count property?

Created on 2 Oct 2018  路  2Comments  路  Source: dotnet/runtime

In the .Any() method here:
https://github.com/dotnet/corefx/blob/e043326e204a9566ee26403b522cf95cda2d54ee/src/System.Linq/src/System/Linq/AnyAll.cs#L18:L21

would it make sense to check for IReadOnlyCollection and call Count in order to avoid the enumerator instantiation?

picture dnickless

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Oh well, it would appear there is high demand for that. ;) I'll close this one and I promise to properly use the search next time.

picture dnickless on 2 Oct 2018
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All 2 comments

https://github.com/dotnet/corefx/issues/24773
https://github.com/dotnet/corefx/issues/26579
https://github.com/dotnet/corefx/pull/28472

stephentoub picture stephentoub on 2 Oct 2018

Oh well, it would appear there is high demand for that. ;) I'll close this one and I promise to properly use the search next time.

dnickless picture dnickless on 2 Oct 2018
😄3
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