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Fix for a rare race condition in System.IO.Packaging #63013

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Dec 20, 2021
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Fix for a rare race condition in System.IO.Packaging #63013

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8 changes: 5 additions & 3 deletions src/libraries/System.IO.Packaging/src/System/IO/Packaging/PackUriHelper.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -684,13 +684,15 @@ internal string PartUriExtension
{
if (_partUriExtension == null)
{
_partUriExtension = Path.GetExtension(_partUriString);
string partUriExtension = Path.GetExtension(_partUriString);

//If extension is absent just return the empty string
//else remove the leading "." from the returned extension
//string
if (_partUriExtension.Length > 0)
_partUriExtension = _partUriExtension.Substring(1);
if (partUriExtension.Length > 0)
partUriExtension = partUriExtension.Substring(1);

_partUriExtension = partUriExtension;
}
return _partUriExtension;
}
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