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List<T>.RemoveAll Method

Removes all the elements that match the conditions defined by the specified predicate.

Namespace:  System.Collections.Generic
Assembly:  mscorlib (in mscorlib.dll)

public int RemoveAll(
	Predicate<T> match
)

Parameters

match
Type: System.Predicate<T>
The Predicate<T> delegate that defines the conditions of the elements to remove.

Return Value

Type: System.Int32
The number of elements removed from the List<T> .

ExceptionCondition
ArgumentNullException

match is null.

The Predicate<T> is a delegate to a method that returns true if the object passed to it matches the conditions defined in the delegate. The elements of the current List<T> are individually passed to the Predicate<T> delegate, and the elements that match the conditions are removed from the List<T>.

This method performs a linear search; therefore, this method is an O(n) operation, where n is Count.

Silverlight

Supported in: 5

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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