Extension Methods from Fons Sonnemans
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Pivot
Groups the elements of a sequence according to a specified firstKey selector function and rotates the unique values from the secondKey selector function into multiple values in the output, and performs aggregations.
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AddRange<T>()
I have created this AddRange<T>() method on ObservableCollection<T> because the LINQ Concat() method didn't trigger the CollectionChanged event. This method does.
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ToObservableCollection<T>()
Convert a IEnumerable<T> to a ObservableCollection<T> and can be used in XAML (Silverlight and WPF) projects
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Storyboard.BeginAsync()
Begin an XAML Storyboard using the async/await pattern instead of using the completed event.
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IndexOf<T>()
Returns the index of the first occurrence in a sequence by using the default equality comparer or a specified one.
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IsPrime
Returns true when a integer is a prime.
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SetCookie(), GetCookie(), DeleteCookie()
Extension methods on HtmlDocument used to read, write and delete cookies in Silverlight applications.
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ToString
Concatenates a specified separator String between each element of a specified enumeration, yielding a single concatenated string.
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GetValueOrDefault<T> for DbDataReader
Helper method to retrieve a nullable value of a column from a datareader.
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Popup.ShowAsync()
Show an XAMP Popup using the async/await pattern instead of using the completed event.
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Append() and Prepend()
Append() adds a value to the end of the sequence. Prepend() adds a value to the beginning of the sequence. This is usefull if you are not using .NET Core or .NET Framework 4.7.
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ToColor
Convert a (A)RGB string to a Silverlight Color object
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SetInputScope
Set the InputScope of TextBox on a Windows 7 Phone.
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FirstIndex() and LastIndex()
Finds the index of the first of last occurence which matches the predicate.
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GetPermutations
GetPermutations
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First(), Last(), Any()
Helper methods to simplify development. Prevent common LINQ performance mistakes.
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Chooser.ShowAsync()
Show Windows Phone Choosers using the async/await pattern instead of using the completed event.
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WriteToConsole
Write all elements in the Enumeration to the Console
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FirstOrNothing
Returns the first element of a sequence, or a nullable value which has no value if no element is found.
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FindMin() and FindMax()
Selects the object in a list with the minimum or maximum value on a particular property
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SetInitialFocus
Set the initial focus for a Silverlight ChildWindow.
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SplitNext
Split the next part of this span with the given separator
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ToList(capacity)
LINQ ToList() extension method with an extra capacity argument. This can boost the speed of creating the list.
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InsertSorted
Insert an item to a sorted List
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Right
Returns a string containing a specified number of characters from the right side of a string
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FillSpan
Fill any Span using an IEnumerable. Returns the number of items which are placed in the Span.
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All() and Any() on Array and List<T>
Faster implementations of the LINQ All() and Any() methods for Array and List<T>. This solution uses less memory allocations and is just faster. Temporary solution until this PR is accepted https://github.com/dotnet/runtime/pull/1832
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ForEachRef
Performs the specified action on each ValueType in the List<T> without copying it.
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AnyAndAll
Determines whether a sequence contains any elements and whether all elements of a sequence satisfy a condition. The normal 'All' method returns true when the sequence is empty.
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EnumerateWithIndex<T>()
Enumerate an IEnumerable<T> source and getting the Index and the Item returned in a ValueTuple.
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Fluent DateOnly Extensions
A fluent way to create DateOnly values.
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Dictionary<K,V>.GetValueOrDefault()
If you attempt to get a value from a dictionary using a key that doesn't exist, it throws a KeyNotFoundException. But this extension method to return a default value when the key doesn't exist. Also supports an overload with a Lazy initialization of the fallback value.
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SkipFrom
Bypasses a specified number of elements in a sequence from a given start position