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ES-975464 - Resolve the ReadMe issue in this sample repository
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‎README.md‎

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# How to load data on demand using events in winui treegrid?
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This examples describes how to load data on demand using events in winui treegrid.
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# How to load data on demand using events in WinUI TreeGrid
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This examples describes how to load data on demand using events in [WinUI TreeGrid](https://www.syncfusion.com/winui-controls/treegrid) (SfTreeGrid).
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SfTreeGrid supports to load the data in on-demand through [SfTreeGrid.RequestTreeItems](https://help.syncfusion.com/cr/winui/Syncfusion.UI.Xaml.TreeGrid.SfTreeGrid.html#Syncfusion_UI_Xaml_TreeGrid_SfTreeGrid_RequestTreeItems) event. `RequestTreeItems` event is triggered at the time of loading and when user expand any node at runtime. SfTreeGrid gets the root and leaf nodes through this event handler.
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`TreeGridRequestTreeItemsEventArgs.ParentItem` denotes the data object looking for its child nodes. If it is null, it denotes SfTreeGrid requesting root nodes.
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In the below example SfTreeGrid is populated through `SfTreeGrid.RequestTreeItems` instead of setting [SfTreeGrid.ItemsSource](https://help.syncfusion.com/cr/winui/Syncfusion.UI.Xaml.TreeGrid.SfTreeGrid.html#Syncfusion_UI_Xaml_TreeGrid_SfTreeGrid_ItemsSource).
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``` csharp
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treeGrid.RequestTreeItems += TreeGrid_RequestTreeItems;
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private void TreeGrid_RequestTreeItems(object sender, TreeGridRequestTreeItemsEventArgs e)
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{
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if (e.ParentItem == null)
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{
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//get the root list - get all employees who have no boss
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e.ChildItems = (this.treeGrid.DataContext as ViewModel).EmployeeDetails.Where(x => x.ReportsTo == -1); //get all employees whose boss's id is -1 (no boss)
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}
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else //if ParentItem not null, then set args.ChildList to the child items for the given ParentItem.
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{ //get the children of the parent object
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EmployeeInfo emp = e.ParentItem as EmployeeInfo;
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if (emp != null)
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{
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//get all employees that report to the parent employee
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e.ChildItems = (this.treeGrid.DataContext as ViewModel).GetReportees(emp.ID);
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}
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}
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}
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```
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``` csharp
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public class EmployeeInfo : NotificationObject
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{
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int _id;
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/// <summary>
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/// Gets or sets the ID.
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/// </summary>
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/// <value>The ID.</value>
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public int ID
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{
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get
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{
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return _id;
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}
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set
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{
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_id = value;
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RaisePropertyChanged("ID");
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}
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}
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string _firstName;
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/// <summary>
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/// Gets or sets the first name.
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/// </summary>
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/// <value>The first name.</value>
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public string FirstName
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{
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get
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{
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return _firstName;
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}
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set
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{
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_firstName = value;
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RaisePropertyChanged("FirstName");
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}
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}
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string _lastName;
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/// <summary>
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/// Gets or sets the last name.
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/// </summary>
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/// <value>The last name.</value>
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public string LastName
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{
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get
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{
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return _lastName;
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}
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set
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{
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_lastName = value;
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RaisePropertyChanged("LastName");
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}
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}
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private string _title;
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/// <summary>
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/// Gets or sets the title.
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/// </summary>
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/// <value>The title.</value>
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public string Title
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{
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get
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{
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return _title;
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}
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set
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{
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_title = value;
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RaisePropertyChanged("Title");
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}
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}
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double? _salary;
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/// <summary>
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/// Gets or sets the salary.
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/// </summary>
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/// <value>The salary.</value>
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public double? Salary
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{
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get
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{
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return _salary;
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}
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set
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{
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_salary = value;
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RaisePropertyChanged("Salary");
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}
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}
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int _reportsTo;
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/// <summary>
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/// Gets or sets the reports to.
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/// </summary>
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/// <value>The reports to.</value>
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public int ReportsTo
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{
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get
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{
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return _reportsTo;
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}
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set
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{
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_reportsTo = value;
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RaisePropertyChanged("ReportsTo");
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}
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}
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}
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```
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``` csharp
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public class ViewModel : NotificationObject
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{
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/// <summary>
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/// Initializes a new instance of the <see cref="ViewModel"/> class.
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/// </summary>
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public ViewModel()
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{
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EmployeeDetails = new List<EmployeeInfo>();
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EmployeeDetails.Add(new EmployeeInfo() { FirstName = "Hwakin", ID = 65, LastName = "Grant", Title = "Business Manager", Salary = 200000, ReportsTo = -1 });
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EmployeeDetails.Add(new EmployeeInfo() { FirstName = "Madison", ID = 34, LastName = "Bush", Title = "Vice President", Salary = 200000, ReportsTo = -1 });
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EmployeeDetails.Add(new EmployeeInfo() { FirstName = "Richard", ID = 36, LastName = "Monroe", Title = "HR Coordinator", Salary = 200000, ReportsTo = -1 });
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EmployeeDetails.Add(new EmployeeInfo() { FirstName = "Jack", ID = 43, LastName = "Madison", Title = "Supervisor", Salary = 25000, ReportsTo = 55 });
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}
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/// <summary>
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/// Gets or sets the employee details.
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/// </summary>
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/// <value>The employee details.</value>
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public List<EmployeeInfo> EmployeeDetails
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{
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get;
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set;
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}
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/// <summary>
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/// Gets the reportees.
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/// </summary>
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/// <param name="bossID">The boss ID.</param>
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/// <returns></returns>
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public IEnumerable<EmployeeInfo> GetReportees(int bossID)
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{
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List<EmployeeInfo> list = new List<EmployeeInfo>();
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if (bossID == 65)
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{
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list.Add(new EmployeeInfo() { FirstName = "John", ID = 5, LastName = "Polk", Title = "Marketing Specialist", Salary = 100000, ReportsTo = 65 });
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list.Add(new EmployeeInfo() { FirstName = "Bill", ID = 26, LastName = "Wilson", Title = "Senior Tool Designer", Salary = 100000, ReportsTo = 65 });
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list.Add(new EmployeeInfo() { FirstName = "Jimmy", ID = 23, LastName = "Harry", Title = "Stocker", Salary = 50000, ReportsTo = 65 });
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list.Add(new EmployeeInfo() { FirstName = "Harry", ID = 68, LastName = "Coolidge", Title = "Maintainence Superviser", Salary = 50000, ReportsTo = 65 });
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}
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if (bossID == 34)
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{
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list.Add(new EmployeeInfo() { FirstName = "Franklin", ID = 24, LastName = "Madison", Title = "Quality Assurance Supervisor", Salary = 40000, ReportsTo = 34 });
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list.Add(new EmployeeInfo() { FirstName = "William", ID = 66, LastName = "Nixon", Title = "Production Technician", Salary = 40000, ReportsTo = 34 });
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list.Add(new EmployeeInfo() { FirstName = "Grover", ID = 35, LastName = "Taft", Title = "Stocker", Salary = 50000, ReportsTo = 34 });
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list.Add(new EmployeeInfo() { FirstName = "Bill", ID = 18, LastName = "Nixon", Title = "Maintainence Superviser", Salary = 50000, ReportsTo = 34 });
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}
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if (bossID == 36)
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{
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list.Add(new EmployeeInfo() { FirstName = "Madison", ID = 64, LastName = "Franklin", Title = "Quality Assurance Supervisor", Salary = 40000, ReportsTo = 36 });
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list.Add(new EmployeeInfo() { FirstName = "Wilson", ID = 67, LastName = "Harry", Title = "Production Technician", Salary = 40000, ReportsTo = 36 });
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list.Add(new EmployeeInfo() { FirstName = "Harry", ID = 59, LastName = "Taft", Title = "Stocker", Salary = 50000, ReportsTo = 36 });
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list.Add(new EmployeeInfo() { FirstName = "Jimmy", ID = 08, LastName = "Grover", Title = "Maintainence Superviser", Salary = 50000, ReportsTo = 36 });
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}
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if (bossID == 5)
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{
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list.Add(new EmployeeInfo() { FirstName = "Franklin", ID = 47, LastName = "William", Title = "Quality Assurance Supervisor", Salary = 40000, ReportsTo = 5 });
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list.Add(new EmployeeInfo() { FirstName = "Taft", ID = 52, LastName = "Peter", Title = "Production Technician", Salary = 40000, ReportsTo = 5 });
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list.Add(new EmployeeInfo() { FirstName = "Harry", ID = 34, LastName = "Wilson", Title = "Stocker", Salary = 50000, ReportsTo = 5 });
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list.Add(new EmployeeInfo() { FirstName = "Grover", ID = 41, LastName = "John", Title = "Maintainence Superviser", Salary = 50000, ReportsTo = 5 });
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}
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if (bossID == 26)
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{
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list.Add(new EmployeeInfo() { FirstName = "Andrew", ID = 11, LastName = "Wilson", Title = "Quality Assurance Supervisor", Salary = 40000, ReportsTo = 26 });
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list.Add(new EmployeeInfo() { FirstName = "George", ID = 24, LastName = "Madison", Title = "Production Technician", Salary = 40000, ReportsTo = 26 });
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list.Add(new EmployeeInfo() { FirstName = "Peter", ID = 33, LastName = "Taft", Title = "Stocker", Salary = 50000, ReportsTo = 26 });
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list.Add(new EmployeeInfo() { FirstName = "Jimmy", ID = 54, LastName = "Harry", Title = "Maintainence Superviser", Salary = 50000, ReportsTo = 26 });
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}
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if (bossID == 23)
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{
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list.Add(new EmployeeInfo() { FirstName = "Bush", ID = 98, LastName = "Bill", Title = "Quality Assurance Supervisor", Salary = 40000, ReportsTo = 23 });
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list.Add(new EmployeeInfo() { FirstName = "Hayes", ID = 32, LastName = "William", Title = "Production Technician", Salary = 40000, ReportsTo = 23 });
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list.Add(new EmployeeInfo() { FirstName = "Madison", ID = 12, LastName = "Franklin", Title = "Stocker", Salary = 50000, ReportsTo = 23 });
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list.Add(new EmployeeInfo() { FirstName = "Arthur", ID = 96, LastName = "Grover", Title = "Maintainence Superviser", Salary = 50000, ReportsTo = 23 });
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}
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if (bossID == 18)
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{
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list.Add(new EmployeeInfo() { FirstName = "Adams", ID = 71, LastName = "Reagan", Title = "Quality Assurance Supervisor", Salary = 40000, ReportsTo = 18 });
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list.Add(new EmployeeInfo() { FirstName = "Nixon", ID = 92, LastName = "Tyler", Title = "Production Technician", Salary = 40000, ReportsTo = 18 });
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list.Add(new EmployeeInfo() { FirstName = "Coolidge", ID = 43, LastName = "Polk", Title = "Design Engineer", Salary = 50000, ReportsTo = 18 });
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list.Add(new EmployeeInfo() { FirstName = "George", ID = 84, LastName = "Harrison", Title = "Maintainence Superviser", Salary = 50000, ReportsTo = 18 });
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}
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if (bossID == 68)
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{
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list.Add(new EmployeeInfo() { FirstName = "Madison", ID = 125, LastName = "Bill", Title = "Marketing Specialist", Salary = 100000, ReportsTo = 68 });
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list.Add(new EmployeeInfo() { FirstName = "Nixon", ID = 226, LastName = "Wilson", Title = "Senior Tool Designer", Salary = 100000, ReportsTo = 68 });
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list.Add(new EmployeeInfo() { FirstName = "Taft", ID = 253, LastName = "Franklin", Title = "Stocker", Salary = 50000, ReportsTo = 68 });
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list.Add(new EmployeeInfo() { FirstName = "Harry", ID = 618, LastName = "Coolidge", Title = "Maintainence Superviser", Salary = 50000, ReportsTo = 68 });
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}
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if (bossID == 24)
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{
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list.Add(new EmployeeInfo() { FirstName = "Franklin", ID = 244, LastName = "Madison", Title = "Quality Assurance Supervisor", Salary = 40000, ReportsTo = 24 });
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list.Add(new EmployeeInfo() { FirstName = "William", ID = 166, LastName = "Nixon", Title = "Production Technician", Salary = 40000, ReportsTo = 24 });
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list.Add(new EmployeeInfo() { FirstName = "Grover", ID = 355, LastName = "Taft", Title = "Stocker", Salary = 50000, ReportsTo = 24 });
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list.Add(new EmployeeInfo() { FirstName = "Bill", ID = 148, LastName = "Harry", Title = "Production Superviser", Salary = 50000, ReportsTo = 24 });
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}
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if (bossID == 66)
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{
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list.Add(new EmployeeInfo() { FirstName = "Stogner", ID = 64, LastName = "Martin", Title = "Quality Assurance Supervisor", Salary = 40000, ReportsTo = 66 });
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list.Add(new EmployeeInfo() { FirstName = "Wilson", ID = 67, LastName = "Harry", Title = "Production Technician", Salary = 40000, ReportsTo = 66 });
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list.Add(new EmployeeInfo() { FirstName = "Harrison", ID = 59, LastName = "Will", Title = "Stocker", Salary = 50000, ReportsTo = 66 });
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list.Add(new EmployeeInfo() { FirstName = "Jimmy", ID = 08, LastName = "Grover", Title = "Maintainence Superviser", Salary = 50000, ReportsTo = 66 });
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}
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if (bossID == 35)
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{
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list.Add(new EmployeeInfo() { FirstName = "Franklin", ID = 417, LastName = "William", Title = "Quality Assurance Supervisor", Salary = 40000, ReportsTo = 35 });
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list.Add(new EmployeeInfo() { FirstName = "Taft", ID = 522, LastName = "Peter", Title = "Production Technician", Salary = 40000, ReportsTo = 35 });
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list.Add(new EmployeeInfo() { FirstName = "Harry", ID = 341, LastName = "Wilson", Title = "Stocker", Salary = 50000, ReportsTo = 35 });
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list.Add(new EmployeeInfo() { FirstName = "Grover", ID = 141, LastName = "John", Title = "Maintainence Superviser", Salary = 50000, ReportsTo = 35 });
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}
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if (bossID == 64)
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{
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list.Add(new EmployeeInfo() { FirstName = "Andrew", ID = 141, LastName = "Wilson", Title = "Quality Assurance Supervisor", Salary = 40000, ReportsTo = 64 });
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list.Add(new EmployeeInfo() { FirstName = "Will", ID = 244, LastName = "Madison", Title = "Production Technician", Salary = 40000, ReportsTo = 64 });
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list.Add(new EmployeeInfo() { FirstName = "Harrison", ID = 343, LastName = "Taft", Title = "Stocker", Salary = 50000, ReportsTo = 64 });
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list.Add(new EmployeeInfo() { FirstName = "Jimmy", ID = 544, LastName = "Harry", Title = "Maintainence Superviser", Salary = 50000, ReportsTo = 64 });
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}
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if (bossID == 67)
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{
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list.Add(new EmployeeInfo() { FirstName = "Bush", ID = 98, LastName = "Bill", Title = "Quality Assurance Supervisor", Salary = 40000, ReportsTo = 67 });
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list.Add(new EmployeeInfo() { FirstName = "Hayes", ID = 32, LastName = "William", Title = "Production Technician", Salary = 40000, ReportsTo = 67 });
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list.Add(new EmployeeInfo() { FirstName = "Madison", ID = 12, LastName = "Franklin", Title = "Stocker", Salary = 50000, ReportsTo = 67 });
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list.Add(new EmployeeInfo() { FirstName = "Arthur", ID = 96, LastName = "Grover", Title = "Maintainence Superviser", Salary = 50000, ReportsTo = 67 });
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}
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if (bossID == 59)
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{
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list.Add(new EmployeeInfo() { FirstName = "Adams", ID = 711, LastName = "Reagan", Title = "Quality Assurance Supervisor", Salary = 40000, ReportsTo = 59 });
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list.Add(new EmployeeInfo() { FirstName = "Nixon", ID = 192, LastName = "Tyler", Title = "Production Technician", Salary = 40000, ReportsTo = 59 });
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list.Add(new EmployeeInfo() { FirstName = "Coolidge", ID = 413, LastName = "Polk", Title = "Design Engineer", Salary = 50000, ReportsTo = 59 });
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list.Add(new EmployeeInfo() { FirstName = "George", ID = 841, LastName = "Harrison", Title = "Maintainence Superviser", Salary = 50000, ReportsTo = 59 });
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}
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if (bossID == 8)
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{
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list.Add(new EmployeeInfo() { FirstName = "William", ID = 71, LastName = "Bush", Title = "Quality Assurance Supervisor", Salary = 40000, ReportsTo = 8 });
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list.Add(new EmployeeInfo() { FirstName = "Harry", ID = 92, LastName = "Tyler", Title = "Production Technician", Salary = 40000, ReportsTo = 8 });
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list.Add(new EmployeeInfo() { FirstName = "Arthur", ID = 43, LastName = "Polk", Title = "Design Engineer", Salary = 50000, ReportsTo = 8 });
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list.Add(new EmployeeInfo() { FirstName = "George", ID = 84, LastName = "Harrison", Title = "Maintainence Superviser", Salary = 50000, ReportsTo = 8 });
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}
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return list;
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}
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}
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```

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