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Reduce enumerations and delegate invocations #28470

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Dec 18, 2020
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Reduce enumerations and delegate invocations #28470

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8 changes: 6 additions & 2 deletions src/Hosting/Hosting/src/WebHostBuilder.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -183,9 +183,13 @@ public IWebHost Build()
var logger = host.Services.GetRequiredService<ILogger<WebHost>>();

// Warn about duplicate HostingStartupAssemblies
foreach (var assemblyName in _options.GetFinalHostingStartupAssemblies().GroupBy(a => a, StringComparer.OrdinalIgnoreCase).Where(g => g.Count() > 1))
var assemblyNames = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
foreach (var assemblyName in _options.GetFinalHostingStartupAssemblies())
{
logger.LogWarning($"The assembly {assemblyName} was specified multiple times. Hosting startup assemblies should only be specified once.");
if (!assemblyNames.Add(assemblyName))
{
logger.LogWarning($"The assembly {assemblyName} was specified multiple times. Hosting startup assemblies should only be specified once.");
}
}

return host;
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