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Review usage of string.Substring (part 1)

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Reduced allocations by replacing string.Substring with ReadOnlySpan<char>.Slice
This commit is contained in:
Bond_009
2020-07-22 13:34:51 +02:00
parent 0750357916
commit febb6bced6
25 changed files with 124 additions and 99 deletions
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4
Emby.Server.Implementations/LiveTv/Listings/SchedulesDirect.cs
View File

@@ -461,7 +461,7 @@ namespace Emby.Server.Implementations.LiveTv.Listings
private async Task<List<ScheduleDirect.ShowImages>> GetImageForPrograms(
ListingsProviderInfo info,
List<string> programIds,
CancellationToken cancellationToken)
CancellationToken cancellationToken)
{
if (programIds.Count == 0)
{
@@ -474,7 +474,7 @@ namespace Emby.Server.Implementations.LiveTv.Listings
{
var imageId = i.Substring(0, 10);
if (!imageIdString.Contains(imageId))
if (!imageIdString.Contains(imageId, StringComparison.Ordinal))
{
imageIdString += "\"" + imageId + "\",";
}

9
Emby.Server.Implementations/LiveTv/TunerHosts/HdHomerun/HdHomerunHost.cs
View File

@@ -195,7 +195,7 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts.HdHomerun
while (!sr.EndOfStream)
{
string line = StripXML(sr.ReadLine());
if (line.Contains("Channel"))
if (line.Contains("Channel", StringComparison.Ordinal))
{
LiveTvTunerStatus status;
var index = line.IndexOf("Channel", StringComparison.OrdinalIgnoreCase);
@@ -226,6 +226,11 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts.HdHomerun
private static string StripXML(string source)
{
if (string.IsNullOrEmpty(source))
{
return string.Empty;
}
char[] buffer = new char[source.Length];
int bufferIndex = 0;
bool inside = false;
@@ -270,7 +275,7 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts.HdHomerun
for (int i = 0; i < model.TunerCount; ++i)
{
var name = string.Format("Tuner {0}", i + 1);
var name = string.Format(CultureInfo.InvariantCulture, "Tuner {0}", i + 1);
var currentChannel = "none"; // @todo Get current channel and map back to Station Id
var isAvailable = await manager.CheckTunerAvailability(ipInfo, i, cancellationToken).ConfigureAwait(false);
var status = isAvailable ? LiveTvTunerStatus.Available : LiveTvTunerStatus.LiveTv;

25
Emby.Server.Implementations/LiveTv/TunerHosts/M3uParser.cs
View File

@@ -158,15 +158,14 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts
private string GetChannelNumber(string extInf, Dictionary<string, string> attributes, string mediaUrl)
{
var nameParts = extInf.Split(new[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
var nameInExtInf = nameParts.Length > 1 ? nameParts[nameParts.Length - 1].Trim() : null;
var nameInExtInf = nameParts.Length > 1 ? nameParts[^1].AsSpan().Trim() : ReadOnlySpan<char>.Empty;
string numberString = null;
string attributeValue;
double doubleValue;
if (attributes.TryGetValue("tvg-chno", out attributeValue))
{
if (double.TryParse(attributeValue, NumberStyles.Any, CultureInfo.InvariantCulture, out doubleValue))
if (double.TryParse(attributeValue, NumberStyles.Any, CultureInfo.InvariantCulture, out _))
{
numberString = attributeValue;
}
@@ -176,36 +175,36 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts
{
if (attributes.TryGetValue("tvg-id", out attributeValue))
{
if (double.TryParse(attributeValue, NumberStyles.Any, CultureInfo.InvariantCulture, out doubleValue))
if (double.TryParse(attributeValue, NumberStyles.Any, CultureInfo.InvariantCulture, out _))
{
numberString = attributeValue;
}
else if (attributes.TryGetValue("channel-id", out attributeValue))
{
if (double.TryParse(attributeValue, NumberStyles.Any, CultureInfo.InvariantCulture, out doubleValue))
if (double.TryParse(attributeValue, NumberStyles.Any, CultureInfo.InvariantCulture, out _))
{
numberString = attributeValue;
}
}
}
if (String.IsNullOrWhiteSpace(numberString))
if (string.IsNullOrWhiteSpace(numberString))
{
// Using this as a fallback now as this leads to Problems with channels like "5 USA"
// where 5 isnt ment to be the channel number
// Check for channel number with the format from SatIp
// #EXTINF:0,84. VOX Schweiz
// #EXTINF:0,84.0 - VOX Schweiz
if (!string.IsNullOrWhiteSpace(nameInExtInf))
if (!nameInExtInf.IsEmpty && !nameInExtInf.IsWhiteSpace())
{
var numberIndex = nameInExtInf.IndexOf(' ');
if (numberIndex > 0)
{
var numberPart = nameInExtInf.Substring(0, numberIndex).Trim(new[] { ' ', '.' });
var numberPart = nameInExtInf.Slice(0, numberIndex).Trim(new[] { ' ', '.' });
if (double.TryParse(numberPart, NumberStyles.Any, CultureInfo.InvariantCulture, out var number))
if (double.TryParse(numberPart, NumberStyles.Any, CultureInfo.InvariantCulture, out _))
{
numberString = numberPart;
numberString = numberPart.ToString();
}
}
}
@@ -231,7 +230,7 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts
{
try
{
numberString = Path.GetFileNameWithoutExtension(mediaUrl.Split('/').Last());
numberString = Path.GetFileNameWithoutExtension(mediaUrl.Split('/')[^1]);
if (!IsValidChannelNumber(numberString))
{
@@ -258,7 +257,7 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts
return false;
}
if (!double.TryParse(numberString, NumberStyles.Any, CultureInfo.InvariantCulture, out var value))
if (!double.TryParse(numberString, NumberStyles.Any, CultureInfo.InvariantCulture, out _))
{
return false;
}
@@ -281,7 +280,7 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts
{
var numberPart = nameInExtInf.Substring(0, numberIndex).Trim(new[] { ' ', '.' });
if (double.TryParse(numberPart, NumberStyles.Any, CultureInfo.InvariantCulture, out var number))
if (double.TryParse(numberPart, NumberStyles.Any, CultureInfo.InvariantCulture, out _))
{
// channel.Number = number.ToString();
nameInExtInf = nameInExtInf.Substring(numberIndex + 1).Trim(new[] { ' ', '-' });