Performance

Composite Recipes

Recipes that include further recipes, often including the individual recipes below.

• Performance code quality

Recipes

• Add timeout to Regex
• Avoid NullReferenceException
• Avoid boxing of value type
• Avoid closure when using ConcurrentDictionary
• Avoid locking on publicly accessible instance
• Bitwise operation on enum without Flags attribute
• Convert HasFlag to bitwise operation
• Do not pass non-read-only struct by read-only reference
• Do not use NaN in comparisons
• Do not use ToString on GetType result
• Do not use async void
• Do not use blocking calls on tasks
• Find Dictionary/HashSet with struct key type
• Find EqualityComparer<string>.Default usage
• Find FormattableString that could use string.Create
• Find GetCustomAttributes that could use Attribute.IsDefined
• Find GetType() called on System.Type
• Find Guid.Parse with constant string
• Find LINQ Count() on materialized collection
• Find LINQ methods replaceable with direct methods
• Find LINQ methods replaceable with indexer
• Find Regex that could use source generator
• Find Span<char> equality that should use SequenceEqual
• Find Values.Contains() instead of ContainsValue()
• Find blocking calls in async methods
• Find calls that could use TimeProvider
• Find closure in GetOrAdd that could use factory argument
• Find closure in GetOrAdd/AddOrUpdate factory
• Find implicit culture-sensitive ToString calls
• Find implicit culture-sensitive string methods
• Find methods not forwarding CancellationToken
• Find methods that could be static
• Find missing WithCancellation on async enumerables
• Find simplifiable string.Create calls
• Find string.GetHashCode() without StringComparer
• Find structs without StructLayout attribute
• Find unused Stream.Read return value
• Make parameter ref read-only
• Optimize StringBuilder.Append usage
• Optimize method call
• Remove unnecessary explicit enumerator
• Replace Enum.ToString() with nameof
• Return completed task instead of null
• String.Format format string should be constant
• Throwing of new NotImplementedException
• Use Array.Empty<T>() instead of new T[0]
• Use ContainsKey instead of Keys.Contains
• Use ContainsKey instead of TryGetValue with discard
• Use Count/Length property instead of Count()
• Use Regex.IsMatch
• Use RegexOptions.ExplicitCapture
• Use StringBuilder.AppendLine
• Use StringComparison
• Use char overload for single-character string methods
• Use string.Concat instead of string.Join