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 Certainly! Here's a categorized list of LINQ methods in C# based on their primary operations:

Filtering Methods:

1. Where
2. OfType

Sorting Methods:

1. OrderBy
2. OrderByDescending
3. ThenBy
4. ThenByDescending
5. Reverse

Projection Methods:

1. Select
2. SelectMany

Joining Methods:

1. Join
2. GroupJoin

Set Methods:

1. Distinct
2. Except
3. Intersect
4. Union

Element Methods:

1. ElementAt
2. ElementAtOrDefault
3. First
4. FirstOrDefault
5. Last
6. LastOrDefault
7. Single
8. SingleOrDefault

Quantifier Methods:

1. All
2. Any
3. Contains

Aggregation Methods:

1. Aggregate
2. Average
3. Count
4. LongCount
5. Max
6. Min
7. Sum

Conversion Methods:

1. AsEnumerable
2. Cast
3. DefaultIfEmpty
4. Empty
5. Prepend
6. Append
7. Range
8. Repeat
9. ToArray
10. ToDictionary
11. ToHashSet
12. ToList
13. ToLookup

Partitioning Methods:

1. Skip
2. SkipWhile
3. Take
4. TakeWhile
5. SkipLast
6. TakeLast

Equality Methods:

53. SequenceEqual

Combining Methods:

1. Concat
2. Zip

These methods provide a wide range of operations for querying and manipulating data in LINQ queries in C#.