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Avoid String allocations when writing strings that require special character handling #1191

ysanghi opened this Issue Jun 13, 2018 · 1 comment


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ysanghi commented Jun 13, 2018

JsonValueUtils.WriteEscapedJsonString allocates additional strings when dealing with special characters.

Assemblies affected


Additional detail

JsonValueUtils WriteEscapedJsonString uses Substrings to write strings to underlying textwriter but because of the immutable nature of .NET strings it allocates new strings. To further this, strings are objects in .NET and this makes objects visible to GC. This lead high allocations and excessive work needed by GC to clean this objects up. This can be avoided by using a buffer.


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AlanWong-MS commented Jun 21, 2018

Thanks for filing the issue and opening a PR! The fix has now been merged and should be included in our upcoming ODL release. ETA for the release is slated for end of the month.

@AlanWong-MS AlanWong-MS added this to the OData Lib 7.5 milestone Jun 21, 2018

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