An enumerator that can be used to iterate through the collection. Constructs an immutable dictionary from an existing collection of elements, applying a transformation function to the source keys. Returns distinct elements from a sequence by using the default equality comparer to compare values. Appends a value to the end of the sequence. The elements of each group are projected by using a specified function. Invokes a transform function on each element of a sequence and returns the maximum nullable Single value. Projects each element of a sequence to an IEnumerable, flattens the resulting sequences into one sequence, and invokes a result selector function on each element therein.

Invokes a transform function on each element of a sequence and returns the minimum Decimal value.

Gets the element in the collection at the current position of the enumerator. For another C# example that demonstrates how to implement the IEnumerable interface, see the Generics Sample. Invokes a transform function on each element of a sequence and returns the minimum nullable Single value. Microsoft Visual C# MVP 2008-2011; Codeproject MVP 2008-2011; Open Source Projects Cinch SL/WPF MVVM Your best friend is you. The specified seed value is used as the initial accumulator value, and the specified function is used to select the result value. The specified seed value is used as the initial accumulator value. Returns an enumerator that iterates through the collection.

You can even create your own classes that implement IEnumerable, and those classes will instantly "inherit" all LINQ functionality! The following example demonstrates how to implement the IEnumerable interface and how to use that implementation to create a LINQ query. Computes the average of a sequence of Decimal values that are obtained by invoking a transform function on each element of the input sequence. Invokes a transform function on each element of a sequence and returns the maximum Decimal value.

Computes the sum of the sequence of Decimal values that are obtained by invoking a transform function on each element of the input sequence. All LINQ methods are extension methods to the IEnumerable interface. This sample uses of the yield keyword instead of implementing IEnumerator.

Produces the set intersection of two sequences by using the specified IEqualityComparer to compare values.

If the last call to MoveNext returned false, Current is undefined. Computes the sum of the sequence of nullable Decimal values that are obtained by invoking a transform function on each element of the input sequence.

Returns the maximum value in a generic sequence. Bypasses elements in a sequence as long as a specified condition is true and then returns the remaining elements.

Produces the set union of two sequences by using a specified IEqualityComparer. The element's index is used in the logic of the predicate function. The foreach statement of the C# language ( for each in C++, For Each in Visual Basic) hides the complexity of the enumerators. Invokes a transform function on each element of a generic sequence and returns the minimum resulting value.

Returns a collection of elements that contains the descendant elements of every element and document in the source collection. If the last call to MoveNext returned false, Current is undefined. Returns a collection of the child nodes of every document and element in the source collection.

The IQueryable interface is intended for implementation by query providers. Walkthrough: Implementing IEnumerable(Of T) in Visual Basic.

It does not necessarily need to be implemented; instead, the implementer can simply throw a NotSupportedException. Returns the element at a specified index in a sequence. Creates a Dictionary from an IEnumerable according to a specified key selector function and key comparer.

The following example demonstrates how to implement the IEnumerable interface and uses that implementation to create a LINQ query. Invokes a transform function on each element of a sequence and returns the minimum nullable Decimal value. Enumerates and transforms a sequence, and produces an immutable sorted dictionary of its contents. Returns a number that represents how many elements in the specified sequence satisfy a condition.

Groups the elements of a sequence according to a specified key selector function and creates a result value from each group and its key. Returns a DataTable that contains copies of the DataRow objects, given an input IEnumerable object where the generic parameter T is DataRow. Determines whether two sequences are equal by comparing their elements by using a specified IEqualityComparer. Returns elements from a sequence as long as a specified condition is true. Initially, the enumerator is positioned before the first element in the collection. Creates an immutable array from the specified collection. Enumerates and transforms a sequence, and produces an immutable dictionary of its contents. Only elements that have a matching XName are included in the collection. Implementing IEnumerator also requires IDisposableto be implemented, which you will see in this example.

Groups the elements of a sequence according to a key selector function. Projects each element of a sequence to an IEnumerable, and flattens the resulting sequences into one sequence.

Determines whether a sequence contains a specified element by using a specified IEqualityComparer. IEnumerator is the base interface for all generic enumerators. Enumerates a sequence and produces an immutable sorted set of its contents. Produces the set intersection of two sequences by using the default equality comparer to compare values. Creates a HashSet from an IEnumerable.

MoveNext sets Current to the next element. Sorts the elements of a sequence in ascending order according to a key. Returns elements from a sequence as long as a specified condition is true. Projects each element of a sequence to an IEnumerable, flattens the resulting sequences into one sequence, and invokes a result selector function on each element therein. If MoveNext passes the end of the collection, the enumerator is positioned after the last element in the collection and MoveNext returns false.

Adds a value to the beginning of the sequence. Invokes a transform function on each element of a sequence and returns the maximum Int64 value. Copies DataRow objects to the specified DataTable, given an input IEnumerable object where the generic parameter T is DataRow. Computes the sum of the sequence of Double values that are obtained by invoking a transform function on each element of the input sequence. Returns the last element of a sequence that satisfies a specified condition. Enumerates a sequence and produces an immutable hash set of its contents. Creates a Dictionary from an IEnumerable according to a specified key selector function. Invokes a transform function on each element of a generic sequence and returns the maximum resulting value. Invokes a transform function on each element of a sequence and returns the maximum nullable Double value. A specified IEqualityComparer is used to compare keys.

Creates a Dictionary from an IEnumerable according to specified key selector and element selector functions.

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