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Avoid SolutionConfiguration dictionary resizing #12160

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Merged
JanProvaznik merged 3 commits into from
Aug 25, 2025
Merged

Avoid SolutionConfiguration dictionary resizing #12160

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Avoid SolutionConfiguration dictionary resizing
Erarndt Jul 11, 2025
3b15db8
Merge branch 'main' of https://github.com/dotnet/msbuild into dev/era…
Erarndt Aug 18, 2025
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Erarndt Aug 18, 2025
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19 changes: 14 additions & 5 deletions src/Shared/SolutionConfiguration.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -20,19 +20,19 @@ internal sealed class SolutionConfiguration
public static readonly char[] ConfigPlatformSeparator = { '|' };

// This field stores pre-cached project elements for project guids for quicker access by project guid
private readonly Dictionary<string, XmlElement> _cachedProjectElements = new Dictionary<string, XmlElement>(StringComparer.OrdinalIgnoreCase);
private readonly Dictionary<string, XmlElement> _cachedProjectElements;

// This field stores pre-cached project elements for project guids for quicker access by project absolute path
private readonly Dictionary<string, XmlElement> _cachedProjectElementsByAbsolutePath = new Dictionary<string, XmlElement>(StringComparer.OrdinalIgnoreCase);
private readonly Dictionary<string, XmlElement> _cachedProjectElementsByAbsolutePath;

// This field stores the project absolute path for quicker access by project guid
private readonly Dictionary<string, string> _cachedProjectAbsolutePathsByGuid = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
private readonly Dictionary<string, string> _cachedProjectAbsolutePathsByGuid;

// This field stores the project guid for quicker access by project absolute path
private readonly Dictionary<string, string> _cachedProjectGuidsByAbsolutePath = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
private readonly Dictionary<string, string> _cachedProjectGuidsByAbsolutePath;

// This field stores the list of dependency project guids by depending project guid
private readonly Dictionary<string, List<string>> _cachedDependencyProjectGuidsByDependingProjectGuid = new Dictionary<string, List<string>>(StringComparer.OrdinalIgnoreCase);
private readonly Dictionary<string, List<string>> _cachedDependencyProjectGuidsByDependingProjectGuid;

public SolutionConfiguration(string xmlString)
{
Expand All @@ -44,7 +44,16 @@ public SolutionConfiguration(string xmlString)
// <ProjectConfiguration Project="{4A727FF8-65F2-401E-95AD-7C8BBFBE3167}" AbsolutePath="c:foo\Project3\C.csproj" BuildProjectInSolution="True">Debug|AnyCPU</ProjectConfiguration>
// </SolutionConfiguration>
//

XmlNodeList? projectConfigurationElements = GetProjectConfigurations(xmlString);
int projectConfigurationCount = projectConfigurationElements?.Count ?? 0;

_cachedProjectElements = new Dictionary<string, XmlElement>(projectConfigurationCount, StringComparer.OrdinalIgnoreCase);
_cachedProjectElementsByAbsolutePath = new Dictionary<string, XmlElement>(projectConfigurationCount, StringComparer.OrdinalIgnoreCase);
_cachedProjectAbsolutePathsByGuid = new Dictionary<string, string>(projectConfigurationCount, StringComparer.OrdinalIgnoreCase);
_cachedProjectGuidsByAbsolutePath = new Dictionary<string, string>(projectConfigurationCount, StringComparer.OrdinalIgnoreCase);
_cachedDependencyProjectGuidsByDependingProjectGuid = new Dictionary<string, List<string>>(projectConfigurationCount, StringComparer.OrdinalIgnoreCase);

if (projectConfigurationElements != null)
{
foreach (XmlElement xmlElement in projectConfigurationElements)
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