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Get Count of IReadOnlyCollection object in TryGetNonEnumeratedCount method #98974
Get Count of IReadOnlyCollection object in TryGetNonEnumeratedCount method #98974
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@ruoshili please read the following Contributor License Agreement(CLA). If you agree with the CLA, please reply with the following information.
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Tagging subscribers to this area: @dotnet/area-system-linq Issue DetailsWhatThis PR allows TryGetNonEnumeratedCount to use
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@ruoshili please read the following Contributor License Agreement(CLA). If you agree with the CLA, please reply with the following information.
Contributor License AgreementContribution License AgreementThis Contribution License Agreement ( “Agreement” ) is agreed to by the party signing below ( “You” ), 1. Definitions. “Code” means the computer software code, whether in human-readable or machine-executable form, “Project” means any of the projects owned or managed by .NET Foundation and offered under a license “Submit” is the act of uploading, submitting, transmitting, or distributing code or other content to any “Submission” means the Code and any other copyrightable material Submitted by You, including any 2. Your Submission. You must agree to the terms of this Agreement before making a Submission to any 3. Originality of Work. You represent that each of Your Submissions is entirely Your 4. Your Employer. References to “employer” in this Agreement include Your employer or anyone else 5. Licenses. a. Copyright License. You grant .NET Foundation, and those who receive the Submission directly b. Patent License. You grant .NET Foundation, and those who receive the Submission directly or c. Other Rights Reserved. Each party reserves all rights not expressly granted in this Agreement. 6. Representations and Warranties. You represent that You are legally entitled to grant the above 7. Notice to .NET Foundation. You agree to notify .NET Foundation in writing of any facts or 8. Information about Submissions. You agree that contributions to Projects and information about 9. Governing Law/Jurisdiction. This Agreement is governed by the laws of the State of Washington, and 10. Entire Agreement/Assignment. This Agreement is the entire agreement between the parties, and .NET Foundation dedicates this Contribution License Agreement to the public domain according to the Creative Commons CC0 1. |
@dotnet-policy-service agree |
Thank you for your interest of contribution! Unfortunately, any additional check would result in (slight) performance penalty for cases that doesn't fall into the path. Supporting optimization of readonly interfaces in LINQ has been discussed in #42254. The current approach in our sight is #31001. We are experimenting to make |
Hi huoyaoyuan, Thanks for your prompt reply but I respectfully disagree with your conclusion. Here are my reasons:
Thanks, |
Note that check for covariant interface is measuably slower: (#42254 (comment))
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Ah, I see, that is a good point. I will close this PR. Thanks. |
What
This PR allows TryGetNonEnumeratedCount to use
IReadOnlyCollection.Count
which avoids unnecessary enumeration.