How to: Save And Restore the ASPxTreeList's Layout

Dec 17, 2020
2 minutes to read

Example 1

This example shows how to save/restore the ASPxTreeList’s layout to/from a data store.

C#
VB.NET

csharp

protected void ASPxTreeList1_ClientLayout(object sender,
DevExpress.Web.ASPxClientLayoutArgs e) {
    if (e.LayoutMode == DevExpress.Web.ClientLayoutMode.Saving) {
        SaveUserLayoutToDatabase(userID, "AccountTreeList", e.LayoutData);
    }
    else {
        if (System.IO.File.Exists(fileName))
            e.LayoutData = RestoreUserLayoutFromDatabase(userID, "AccountTreeList");
    }
}

Protected Sub ASPxTreeList1_ClientLayout(sender As Object, _
e As DevExpress.Web.ASPxClientLayoutArgs)
   If e.LayoutMode = DevExpress.Web.ClientLayoutMode.Saving Then
      SaveUserLayoutToDatabase(userID, "AccountTreeList", e.LayoutData)
   Else
      If File.Exists(fileName) Then
         e.LayoutData = RestoreUserLayoutFromDatabase(userID, "AccountTreeList")
      End If
   End If
End Sub

Example 2

This example shows how to manually save and restore the previously saved layout. When the Save Layout or Load Layout button is clicked, the tree list’s client ASPxClientTreeList.PerformCallback method is used to send a callback to the server. This generates the server-side ASPxTreeList.CustomCallback event, which is handled to save or restore the tree list’s layout.

C#
VB.NET

csharp

protected void ASPxTreeList1_CustomCallback(object sender,
DevExpress.Web.ASPxTreeList.TreeListCustomCallbackEventArgs e) {
    if (e.Parameters == "save") {
        SaveUserLayoutToDatabase("userID", "TreeListLayout", ASPxTreeList1.SaveClientLayout());
    }
    if (e.Parameters == "load") {
        ASPxTreeList1.LoadClientLayout(GetUserLayoutFromDatabase("userID", "TreeListLayout"));
    }
}

Protected Sub ASPxTreeList1_CustomCallback(ByVal sender As Object, ByVal e As DevExpress.Web.ASPxTreeList.TreeListCustomCallbackEventArgs)
    If e.Parameters = "save" Then
        SaveUserLayoutToDatabase("userID", "TreeListLayout", ASPxTreeList1.SaveClientLayout())
    End If

    If e.Parameters = "load" Then
        ASPxTreeList1.LoadClientLayout(GetUserLayoutFromDatabase("userID", "TreeListLayout"))
    End If
End Sub

Note

To specify which information on the ASPxTreeList layout can be saved, use options provided by the ASPxTreeList.SettingsCookies property.