Monthly Archives May 2016

The acronym LINQ is for Language Integrated Query. Microsoft’s query language is fully integrated and offers easy data access from in-memory objects, databases, XML documents and many more.

LINQ C# Objects

LINQ Standard Query Operators

Classification Standard Query Operators
Filtering Where, OfType
Sorting OrderBy, OrderByDescending, ThenBy, ThenByDescending, Reverse
Grouping GroupBy, ToLookup
Join GroupJoin, Join
Projection Select, SelectMany
Aggregation Aggregate, Average, Count, LongCount, Max, Min, Sum
Quantifiers All, Any, Contains
Elements ElementAt, ElementAtOrDefault, First, FirstOrDefault, Last, LastOrDefault, Single,
SingleOrDefault
Set Distinct, Except, Intersect, Union
Partitioning Skip, SkipWhile, Take, TakeWhile
Concatenation Concat
Equality SequenceEqual
Generation DefaultEmpty, Empty, Range, Repeat
Conversion AsEnumerable, AsQueryable, Cast, ToArray, ToDictionary, ToList

Examples

The OfType operator filters the collection based on the ability to cast to a specified type.

In a LINQ query expression, the orderby clause enables you to sort the result sequence into the ascending or descending order based on the default comparer for the element type. The orderby clause may have multiple keys in order to perform the sorting based on different sort operations. By default it sorts the result in ascending order that generates the sequence from smallest to the largest element. The method based syntax of LINQ also allows to specify the custom comparer sorting.

GroupBy transforms a collection into groups. Each group has a key. With this method from the System.Linq namespace, you can do this in your C# program on many collections

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A function can have one or more parameters of different data types, but what if you want to pass a function itself as a parameter? How does C# handle the callback functions or event handler? The answer is – delegate.

A delegate is like a pointer to a function. It is a reference type data type and it holds the reference of a method. All the delegates are implicitly derived from System.Delegate class. Read more

Occurs after an item in the repeater control is data-bound but before it is rendered on the page.

Final Output

Repeater with Item Data Bound Event
Repeater with Item Data Bound Event

The following example demonstrates how to specify and code a handler for the ItemDataBound event of the repeater control. The data is modified after it is bound to an item in the repeater control but before it is rendered on the page.

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