Collection<T>.ForEach(Action<T>) Method

Performs the specified action on each element of the current collection.

Namespace: DevExpress.Web

Assembly: DevExpress.Web.v20.2.dll

NuGet Package: DevExpress.Web

Declaration

C#

public Collection<T> ForEach(
    Action<T> action
)

VB.NET

Public Function ForEach(
    action As Action(Of T)
) As Collection(Of T)

Parameters

Name	Type	Description
action	Action<T>	The Action<T> action to perform on each element of the collection.

Returns

Type	Description
Collection<T>	A collection of elements that have been processed by the specified action.

Remarks

The ForEach method individually passes elements of the current collection to the specified action, and returns a collection of elements that have been processed by the action.

Example

The code sample below demonstrates how to apply different style settings, specified in data source custom attributes, to treeview nodes using ForEach method. The image below shows the result.

C#

using DevExpress.Web.ASPxTreeView;
...
protected void ASPxTreeView1_DataBound(object sender, EventArgs e) {
     ASPxTreeView1.Nodes.ForEach(SetColor);
}
private static void SetColor(TreeViewNode node) {
     System.Xml.XmlNode dataNode = ((node.DataItem as IHierarchyData).Item as System.Xml.XmlNode);
     node.TextStyle.ForeColor = System.Drawing.Color.FromName(dataNode.Attributes["Color"].Value);
}

VB.NET

Imports DevExpress.Web.ASPxTreeView
... 
Protected Sub ASPxTreeView1_DataBound(ByVal sender As Object, ByVal e As EventArgs)
     ASPxTreeView1.Nodes.ForEach(AddressOf SetColor)
End Sub
Private Shared Sub SetColor(ByVal node As TreeViewNode)
     Dim dataNode As System.Xml.XmlNode = (TryCast((TryCast(node.DataItem, IHierarchyData)).Item, System.Xml.XmlNode))
     node.TextStyle.ForeColor = System.Drawing.Color.FromName(dataNode.Attributes("Color").Value)
End Sub

XML

<!--Site.xml-->
<mainmenu>
  <item Name="1" Text="Home"  ImageUrl="~/Images/Home.png" Color="Red"/> 
  <item Name="2" Text="News" ImageUrl="~/Images/News.png" Color="Blue"/>
  <item Name="3" Text="Products" ImageUrl="~/Images/Products.png" Color="Green"/>
...

ASPX

<dx:ASPxTreeView ID="ASPxTreeView1" runat="server" DataSourceID="XmlDataSource1" onnodedatabound="ASPxTreeView1_NodeDataBound">
</dx:ASPxTreeView>
<asp:XmlDataSource ID="XmlDataSource1" runat="server" DataFile="~/App_Data/Site.xml" XPath="/mainmenu/item">
</asp:XmlDataSource>