Collection<T>.FindAll(Predicate<T>) Method

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

Namespace: DevExpress.Web

Assembly: DevExpress.Web.v19.1.dll

Declaration

C#

public IEnumerable<T> FindAll(
    Predicate<T> match
)

VB.NET

Public Function FindAll(
    match As Predicate(Of T)
) As IEnumerable(Of T)

Parameters

Name	Type	Description
match	Predicate<T>	A delegate that defines the conditions of the elements to search for.

Returns

Type	Description
IEnumerable<T>	A collection of the elements that match the conditions defined by the predicate.

Remarks

The FindAll method individually passes elements of the current collection to a predicate, and returns a collection of elements that match the predicate. A predicate is a delegate to a method that returns true if the object passed to it matches the conditions defined in the delegate; otherwise the method returns false.

Example

The code sample below demonstrates how you can use the FindAll method to find all items that meet custom conditions within a collection. In this example, the method finds all items that start from letter “A”.

C#

using DevExpress.Web.ASPxTitleIndex;
...
protected void ASPxButton1_Click(object sender, EventArgs e) {
     IEnumerable<TitleIndexItem> List = ASPxTitleIndex1.Items.FindAll(StartWith);
}
public bool StartWith(TitleIndexItem Item) {
     return Item.Text.StartsWith("A");
}

VB.NET

Imports DevExpress.Web.ASPxTitleIndex
...
Protected Sub ASPxButton1_Click(ByVal sender As Object, ByVal e As EventArgs)
     Dim List As IEnumerable(Of TitleIndexItem) = ASPxTitleIndex1.Items.FindAll(AddressOf StartWith)
End Sub
Public Function StartWith(ByVal Item As TitleIndexItem) As Boolean
     Return Item.Text.StartsWith("A")
End Function