Possible multiple enumerations of 'IEnumerable' collection. Consider using an implementation that avoids multiple enumerations. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1851)

Possible multiple enumerations of 'IEnumerable' collection. Consider using an implementation that avoids multiple enumerations. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1851)

Null check can be simplified (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/ide0270)

Null check can be simplified (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/ide0270)

Do not guard 'Dictionary.Remove(key)' with 'Dictionary.ContainsKey(key)' (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1853)

Possible multiple enumerations of 'IEnumerable' collection. Consider using an implementation that avoids multiple enumerations. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1851)

Possible multiple enumerations of 'IEnumerable' collection. Consider using an implementation that avoids multiple enumerations. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1851)

Null check can be simplified (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/ide0270)

Null check can be simplified (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/ide0270)