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

Returns the zero-based index of the first element that matches the conditions defined by the specified predicate.

Namespace: DevExpress.Web

Assembly: DevExpress.Web.v23.2.dll

NuGet Package: DevExpress.Web

Declaration

C#

public int IndexOf(
    Predicate<T> match
)

VB.NET

Public Function IndexOf(
    match As Predicate(Of T)
) As Integer

Parameters

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

Returns

Type	Description
Int32	The zero-based index of the first element that matches the conditions defined by the predicate.

Remarks

The IndexOf method individually passes elements of the current collection to a predicate, and returns the zero-based index of the first element that matches 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

C#

using DevExpress.Web.ASPxNavBar;
...
int ExpandedGroupIndex = ASPxNavBar1.Groups.IndexOf(IsExpanded);
...
private static bool IsExpanded(NavBarGroup group) {
     return group.Expanded;
}

VB.NET

Imports DevExpress.Web.ASPxNavBar
...
Private ExpandedGroupIndex As Integer = ASPxNavBar1.Groups.IndexOf(IsExpanded)
...
Private Shared Function IsExpanded(ByVal group As NavBarGroup) As Boolean
     Return group.Expanded
End Function

ASPX

<dx:ASPxNavBar ID="ASPxNavBar1" runat="server" AutoCollapse="True" DataSourceID="XmlDataSource1">
</dx:ASPxNavBar>