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To compare string ignoring case, use the option StringComparison.OrdinalIgnoreCase #1321

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To compare string ignoring case, use the option StringComparison.OrdinalIgnoreCase #1321

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To compare string ignoring case, use the option StringComparison.Ordi… 
…nalIgnoreCase

instead of converting the case of the whole string.
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@randruc
randruc committed Feb 13, 2025
commit 34863dba47c966f6a2abc0012c4f84f7599ae60c
10 changes: 5 additions & 5 deletions src/core/SIP/SIPEndPoint.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -137,11 +137,11 @@ public static SIPEndPoint ParseSIPEndPoint(string sipEndPointStr)
return null;
}

if (sipEndPointStr.ToLower().StartsWith("udp:") ||
sipEndPointStr.ToLower().StartsWith("tcp:") ||
sipEndPointStr.ToLower().StartsWith("tls:") ||
sipEndPointStr.ToLower().StartsWith("ws:") ||
sipEndPointStr.ToLower().StartsWith("wss:"))
if (sipEndPointStr.StartsWith("udp:", StringComparison.OrdinalIgnoreCase) ||
sipEndPointStr.StartsWith("tcp:", StringComparison.OrdinalIgnoreCase) ||
sipEndPointStr.StartsWith("tls:", StringComparison.OrdinalIgnoreCase) ||
sipEndPointStr.StartsWith("ws:", StringComparison.OrdinalIgnoreCase) ||
sipEndPointStr.StartsWith("wss:", StringComparison.OrdinalIgnoreCase))
{
return ParseSerialisedSIPEndPoint(sipEndPointStr);
}
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18 changes: 8 additions & 10 deletions src/core/SIPEvents/SIPEventPackages.cs
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Expand Up @@ -163,16 +163,14 @@ public static bool IsValid(string value)
{
return false;
}
else if (value.ToLower() == "cancelled" || value.ToLower() == "error" || value.ToLower() == "local-bye" ||
value.ToLower() == "rejected" || value.ToLower() == "replaced" || value.ToLower() == "remote-bye" ||
value.ToLower() == "timeout")
{
return true;
}
else
{
return false;
}

return value.Equals("cancelled", StringComparison.OrdinalIgnoreCase) ||
value.Equals("error", StringComparison.OrdinalIgnoreCase) ||
value.Equals("local-bye", StringComparison.OrdinalIgnoreCase) ||
value.Equals("rejected", StringComparison.OrdinalIgnoreCase) ||
value.Equals("replaced", StringComparison.OrdinalIgnoreCase) ||
value.Equals("remote-bye", StringComparison.OrdinalIgnoreCase) ||
value.Equals("timeout", StringComparison.OrdinalIgnoreCase);
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Given this is being refactored why not make it even readable:

return value.ToLowerInvariant() is "cancelled" 
                                   or "error"
                                   or "local-bye"
                                   or "rejected"
                                   or "replaced"
                                   or "remote-bye"
                                   or "timeout";

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That will potentially allocate a string.

The purposed code is a bit more verbose, but potentially more performant.

Unless all input has be previously sanitized and guaranteed to be lower case.

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Couldn't agree more.

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I'm struggling to see why the emphasis on such fine grained optimisations (in itself an anti-pattern). This part of the code is dealing with the SIP signalling protocol which has far lower traffic volumes than the media & RTP traffic. And even if you're intent on milking performance from the SIP stack you're starting in the wrong place, for example see the extensive use of regex'es in SIPHeader.cs which will far outweigh any string allocations (not that there have been any performance issues reported in that class the last 20 years).

For 90% of the classes in this library the emphasis should be on readability and maintainability ahead of extracting the last 10% of performance. The RTP stack is an exception.

Unlike this lirbary there is a prototype C# video encoding attempt that could benefit a lot from perfomance improvements.

}

public static SIPEventDialogStateEvent Parse(string value)
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