A set of very conservative extension methods — most of those closely follow common naming and implementation patterns in the .NET framework. You can get it from NuGet as AshMind.Extensions.

Below is an auto-generated list of the methods provided:

Array

1. IndexOf
2. LastIndexOf
3. Reverse
4. Sort

Assembly

1. GetAssemblyFile
2. GetAssemblyFileFromCodeBase

Char

1. IsControl
2. IsDigit
3. IsHighSurrogate
4. IsLetter
5. IsLetterOrDigit
6. IsLower
7. IsLowSurrogate
8. IsNumber
9. IsPunctuation
10. IsSeparator
11. IsSurrogate
12. IsSymbol
13. IsUpper
14. IsWhiteSpace
15. ToLower
16. ToLowerInvariant
17. ToUpper
18. ToUpperInvariant

Collection

1. AddRange
2. RemoveAll
3. RemoveWhere

Comparable

1. IsBetween
2. IsGreaterThan
3. IsGreaterThanOrEqual
4. IsLesserThan
5. IsLesserThanOrEqual

DateTime

1. TruncateToHours
2. TruncateToMilliseconds
3. TruncateToMinutes
4. TruncateToSeconds

Delegate

1. AsComparison
2. AsFunction
3. AsPredicate
4. ToComparer

Dictionary

1. AsReadOnly
2. GetOrAdd
3. GetValueOrDefault

Double

1. IsInfinity
2. IsNaN
3. IsNegativeInfinity
4. IsPositiveInfinity

Enumerable

1. Any
2. AsCollection
3. AsList
4. AsReadOnlyCollection
5. AsReadOnlyList
6. Concat
7. EmptyIfNull
8. Except
9. ForEach
10. GroupAdjacentBy
11. HavingMax
12. HavingMin
13. OnAfterEach
14. OnAfterLast
15. OnBeforeEach
16. OnBeforeFirst
17. ToSet

Formattable

1. ToInvariantString
2. ToString

Int32

1. IsBetween
2. Times

List

1. AsReadOnly
2. EnumerateRange
3. InsertRange
4. RemoveRange

Reflection

1. CreateDelegate
2. GetCustomAttribute
3. GetCustomAttributes
4. HasInterface
5. IsAssignableFrom
6. IsAssignableTo
7. IsDefined
8. IsGenericTypeDefinedAs
9. IsSameAsOrSubclassOf
10. IsSubclassOf

String

1. Contains
2. IsNullOrEmpty
3. IsNullOrWhiteSpace
4. NullIfEmpty
5. RemoveEnd
6. RemoveStart
7. Split
8. SubstringAfter
9. SubstringAfterLast
10. SubstringBefore
11. SubstringBeforeLast
12. TruncateEnd

Time

1. Ago
2. Days
3. Hours
4. Milliseconds
5. Minute
6. Minutes
7. Seconds