Getting Started with ASP.NET Core TreeGrid Control

30 Jan 202624 minutes to read

This section explains how to add the ASP.NET Core TreeGrid control to an ASP.NET Core application using Visual Studio.

Prerequisites

System requirements for ASP.NET Core controls

Create ASP.NET Core web application with Razor pages

Create a Project using Microsoft Templates

Install ASP.NET Core package in the application

To add Syncfusion ASP.NET Core controls, open the NuGet Package Manager in Visual Studio (navigate to Tools → NuGet Package Manager → Manage NuGet Packages for Solution), search for Syncfusion.EJ2.AspNet.Core, and install it.

Alternatively, use the Package Manager Console with this command:

Package Manager
Install-Package Syncfusion.EJ2.AspNet.Core -Version 32.1.19

NOTE

Syncfusion^® ASP.NET Core controls are available in nuget.org. Refer to NuGet packages topic to learn more about installing NuGet packages in various OS environments. The Syncfusion.EJ2.AspNet.Core NuGet package has dependencies, Newtonsoft.Json for JSON serialization and Syncfusion.Licensing for validating Syncfusion^® license key.

Add Syncfusion^® ASP.NET Core Tag Helper

Open ~/Pages/_ViewImports.cshtml file and import the Syncfusion.EJ2 TagHelper.

~/_ViewImports.cshtml
@addTagHelper *, Syncfusion.EJ2

Add stylesheet and script resources

Here, the theme and script is referred using CDN inside the <head> of ~/Pages/Shared/_Layout.cshtml file as follows,

~/_Layout.cshtml
<head>
    ...
    <!-- Syncfusion ASP.NET Core controls styles -->
    <link rel="stylesheet" href="https://cdn.syncfusion.com/ej2/32.1.19/fluent.css" />
    <!-- Syncfusion ASP.NET Core controls scripts -->
    <script src="https://cdn.syncfusion.com/ej2/32.1.19/dist/ej2.min.js"></script>
</head>

NOTE

Checkout the Themes topic to learn different ways (CDN, NPM package, and CRG) to refer styles in ASP.NET Core application, and to have the expected appearance for Syncfusion^® ASP.NET Core controls.

NOTE

Checkout the Adding Script Reference topic to learn different approaches for adding script references in your ASP.NET Core application.

Register Syncfusion^® Script Manager

Also, register the script manager <ejs-script> at the end of <body> in the ASP.NET Core application as follows.

~/_Layout.cshtml
<body>
    ...
    <!-- Syncfusion ASP.NET Core Script Manager -->
    <ejs-scripts></ejs-scripts>
</body>

The <ejs-scripts> tag must be placed AFTER all page content to ensure all Syncfusion controls are fully rendered before the script manager initializes them.

Add ASP.NET Core TreeGrid control

Now, add the Syncfusion^® ASP.NET Core TreeGrid tag helper in ~/Pages/Index.cshtml page.

CSHTML
<ejs-treegrid id="TreeGrid">

</ejs-treegrid>

Defining Row Data

To bind data for the TreeGrid control, you can assign a IEnumerable object to the dataSource property. The list data source can also be provided as an instance of the DataManager.

CSHTML
CSHTML.cs
@{
    ....
    var data = TreeGridItems.GetTreeData();
}

<ejs-treegrid id="TreeGrid" dataSource="@data" childMapping="Children" treeColumnIndex="1">
</ejs-treegrid>
public class TreeGridItems
{
    public TreeGridItems() { }
    public int TaskId { get; set; }
    public string TaskName { get; set; }
    public DateTime StartDate { get; set; }
    public int Duration { get; set; }
    public List<TreeGridItems> Children { get; set; }

    public static List<TreeGridItems> GetTreeData()
    {
        List<TreeGridItems> BusinessObjectCollection = new List<TreeGridItems>();

        TreeGridItems Record1 = null;

        Record1 = new TreeGridItems()
        {
            TaskId = 1,
            TaskName = "Planning",
            StartDate = new DateTime(2016, 06, 07),
            Duration = 5,
            Children = new List<TreeGridItems>(),
        };
        TreeGridItems Child1 = new TreeGridItems()
        {
            TaskId = 2,
            TaskName = "Plan timeline",
            StartDate = new DateTime(2016, 06, 07),
            Duration = 5
        };

        TreeGridItems Child2 = new TreeGridItems()
        {
            TaskId = 3,
            TaskName = "Plan budget",
            StartDate = new DateTime(2016, 06, 07),
            Duration = 5
        };
        TreeGridItems Child3 = new TreeGridItems()
        {
            TaskId = 4,
            TaskName = "Allocate resources",
            StartDate = new DateTime(2016, 06, 07),
            Duration = 5
        };
        Record1.Children.Add(Child1);
        Record1.Children.Add(Child2);
        Record1.Children.Add(Child3);
        TreeGridItems Record2 = new TreeGridItems()
        {
            TaskId = 6,
            TaskName = "Design",
            StartDate = new DateTime(2021, 08, 25),
            Duration = 3,
            Children = new List<TreeGridItems>()
        };
        TreeGridItems Child5 = new TreeGridItems()
        {
            TaskId = 7,
            TaskName = "Software Specification",
            StartDate = new DateTime(2021, 08, 25),
            Duration = 3
        };

        TreeGridItems Child6 = new TreeGridItems()
        {
            TaskId = 8,
            TaskName = "Develop prototype",
            StartDate = new DateTime(2021, 08, 25),
            Duration = 3
        };
        TreeGridItems Child7 = new TreeGridItems()
        {
            TaskId = 9,
            TaskName = "Get approval from customer",
            StartDate = new DateTime(2024, 06, 27),
            Duration = 2
        };
        Record2.Children.Add(Child5);
        Record2.Children.Add(Child6);
        Record2.Children.Add(Child7);
        BusinessObjectCollection.Add(Record1);
        BusinessObjectCollection.Add(Record2);
        return BusinessObjectCollection;
    }
}

Press Ctrl+F5 (Windows) or ⌘+F5 (macOS) to run the app. Then, the Syncfusion^® ASP.NET Core TreeGrid control will be rendered in the default web browser.

ASP.NET Core TreeGrid Control

Defining Columns

The columns are automatically generated when columns declaration is empty or undefined while initializing the treegrid.

The TreeGrid has an option to define columns using e-treegrid-columns tag helper. In e-treegrid-column tag helper you have properties to customize columns.

Let’s check the properties used here:

The field property is to map with a property name an array of JavaScript objects.
The headerText property is to change the title of columns.
The textAlign property is to change the alignment of columns. By default, columns will be left aligned. To change columns to right align, you need to define textAlign as Right.
Using format property, you can format number and date values to standard or custom formats. Here, you have defined it for the conversion of numeric values to currency.

CSHTML
CSHTML.cs
@{
    ....
    var data = TreeGridItems.GetTreeData();
}

<ejs-treegrid id="TreeGrid" dataSource="@data" childMapping="Children" treeColumnIndex="1">
    <e-treegrid-columns>
        <e-treegrid-column field="TaskId" headerText="Task ID" textAlign="Right" width="95"></e-treegrid-column>
        <e-treegrid-column field="TaskName" headerText="Task Name" width="220"></e-treegrid-column>
        <e-treegrid-column field="StartDate" headerText=" Start Date" textAlign="Right" format="yMd" type="date" width="115"></e-treegrid-column>
        <e-treegrid-column field="EndDate" headerText=" End Date" textAlign="Right" format="yMd" type="date" width="115"></e-treegrid-column>
        <e-treegrid-column field="Duration" headerText="Duration" textAlign="Right" width="100"></e-treegrid-column>
        <e-treegrid-column field="Progress" headerText="Progress" textAlign="Right" width="105"></e-treegrid-column>
        <e-treegrid-column field="Priority" headerText="Priority" width="100"></e-treegrid-column>
    </e-treegrid-columns>
</ejs-treegrid>
public class TreeGridItems
{
    public TreeGridItems() { }
    public int TaskId { get; set; }
    public string TaskName { get; set; }
    public DateTime StartDate { get; set; }
    public int Duration { get; set; }
    public List<TreeGridItems> Children { get; set; }

    public static List<TreeGridItems> GetTreeData()
    {
        List<TreeGridItems> BusinessObjectCollection = new List<TreeGridItems>();

        TreeGridItems Record1 = null;

        Record1 = new TreeGridItems()
        {
            TaskId = 1,
            TaskName = "Planning",
            StartDate = new DateTime(2016, 06, 07),
            Duration = 5,
            Children = new List<TreeGridItems>(),
        };
        TreeGridItems Child1 = new TreeGridItems()
        {
            TaskId = 2,
            TaskName = "Plan timeline",
            StartDate = new DateTime(2016, 06, 07),
            Duration = 5
        };

        TreeGridItems Child2 = new TreeGridItems()
        {
            TaskId = 3,
            TaskName = "Plan budget",
            StartDate = new DateTime(2016, 06, 07),
            Duration = 5
        };
        TreeGridItems Child3 = new TreeGridItems()
        {
            TaskId = 4,
            TaskName = "Allocate resources",
            StartDate = new DateTime(2016, 06, 07),
            Duration = 5
        };
        Record1.Children.Add(Child1);
        Record1.Children.Add(Child2);
        Record1.Children.Add(Child3);
        TreeGridItems Record2 = new TreeGridItems()
        {
            TaskId = 6,
            TaskName = "Design",
            StartDate = new DateTime(2021, 08, 25),
            Duration = 3,
            Children = new List<TreeGridItems>()
        };
        TreeGridItems Child5 = new TreeGridItems()
        {
            TaskId = 7,
            TaskName = "Software Specification",
            StartDate = new DateTime(2021, 08, 25),
            Duration = 3
        };

        TreeGridItems Child6 = new TreeGridItems()
        {
            TaskId = 8,
            TaskName = "Develop prototype",
            StartDate = new DateTime(2021, 08, 25),
            Duration = 3
        };
        TreeGridItems Child7 = new TreeGridItems()
        {
            TaskId = 9,
            TaskName = "Get approval from customer",
            StartDate = new DateTime(2024, 06, 27),
            Duration = 2
        };
        Record2.Children.Add(Child5);
        Record2.Children.Add(Child6);
        Record2.Children.Add(Child7);
        BusinessObjectCollection.Add(Record1);
        BusinessObjectCollection.Add(Record2);
        return BusinessObjectCollection;
    }
}

ASP.NET Core TreeGrid Columns

Enable Paging

Paging breaks large datasets into smaller pages, improving performance and readability. Users see page navigation controls at the bottom of the TreeGrid to move between pages.

Enable paging by setting allowPaging property to true. Pager can be customized using e-treegrid-pagesettings tag helper.

CSHTML
CSHTML.cs
@{
    ....
    var data = TreeGridItems.GetTreeData();
}

<ejs-treegrid id="TreeGrid" dataSource="@data" allowPaging="true" childMapping="Children" treeColumnIndex="1">
    <e-treegrid-pagesettings pageSizes="true" pageSize="10" pageCount="4"></e-treegrid-pagesettings>
    <e-treegrid-columns>
        <e-treegrid-column field="TaskId" headerText="Task ID" textAlign="Right" width="95"></e-treegrid-column>
        <e-treegrid-column field="TaskName" headerText="Task Name" width="220"></e-treegrid-column>
        <e-treegrid-column field="StartDate" headerText=" Start Date" textAlign="Right" format="yMd" type="date" width="115"></e-treegrid-column>
        <e-treegrid-column field="Duration" headerText="Duration" textAlign="Right" width="100"></e-treegrid-column>
    </e-treegrid-columns>
</ejs-treegrid>
public class TreeGridItems
{
    public TreeGridItems() { }
    public int TaskId { get; set; }
    public string TaskName { get; set; }
    public DateTime StartDate { get; set; }
    public int Duration { get; set; }
    public List<TreeGridItems> Children { get; set; }

    public static List<TreeGridItems> GetTreeData()
    {
        List<TreeGridItems> BusinessObjectCollection = new List<TreeGridItems>();

        TreeGridItems Record1 = null;

        Record1 = new TreeGridItems()
        {
            TaskId = 1,
            TaskName = "Planning",
            StartDate = new DateTime(2016, 06, 07),
            Duration = 5,
            Children = new List<TreeGridItems>(),
        };
        TreeGridItems Child1 = new TreeGridItems()
        {
            TaskId = 2,
            TaskName = "Plan timeline",
            StartDate = new DateTime(2016, 06, 07),
            Duration = 5
        };

        TreeGridItems Child2 = new TreeGridItems()
        {
            TaskId = 3,
            TaskName = "Plan budget",
            StartDate = new DateTime(2016, 06, 07),
            Duration = 5
        };
        TreeGridItems Child3 = new TreeGridItems()
        {
            TaskId = 4,
            TaskName = "Allocate resources",
            StartDate = new DateTime(2016, 06, 07),
            Duration = 5
        };
        Record1.Children.Add(Child1);
        Record1.Children.Add(Child2);
        Record1.Children.Add(Child3);
        TreeGridItems Record2 = new TreeGridItems()
        {
            TaskId = 6,
            TaskName = "Design",
            StartDate = new DateTime(2021, 08, 25),
            Duration = 3,
            Children = new List<TreeGridItems>()
        };
        TreeGridItems Child5 = new TreeGridItems()
        {
            TaskId = 7,
            TaskName = "Software Specification",
            StartDate = new DateTime(2021, 08, 25),
            Duration = 3
        };

        TreeGridItems Child6 = new TreeGridItems()
        {
            TaskId = 8,
            TaskName = "Develop prototype",
            StartDate = new DateTime(2021, 08, 25),
            Duration = 3
        };
        TreeGridItems Child7 = new TreeGridItems()
        {
            TaskId = 9,
            TaskName = "Get approval from customer",
            StartDate = new DateTime(2024, 06, 27),
            Duration = 2
        };
        Record2.Children.Add(Child5);
        Record2.Children.Add(Child6);
        Record2.Children.Add(Child7);
        BusinessObjectCollection.Add(Record1);
        BusinessObjectCollection.Add(Record2);
        return BusinessObjectCollection;
    }
}

ASP.NET Core TreeGrid with Paging

Enable Sorting

Sorting allows users to reorder rows by clicking column headers. This helps users find data quickly by organizing it according to their needs.

Enable sorting by setting allowSorting property as true. Sorting feature can be customized using e-treegrid-sortsettings tag helper.

CSHTML
CSHTML.cs
@{
    ....
    var data = TreeGridItems.GetTreeData();
}

<ejs-treegrid id="TreeGrid" dataSource="@data" allowSorting="true" allowPaging="true" childMapping="Children" treeColumnIndex="1">
    <e-treegrid-columns>
        <e-treegrid-column field="TaskId" headerText="Task ID" textAlign="Right" width="95"></e-treegrid-column>
        <e-treegrid-column field="TaskName" headerText="Task Name" width="220"></e-treegrid-column>
        <e-treegrid-column field="StartDate" headerText=" Start Date" textAlign="Right" format="yMd" type="date" width="115"></e-treegrid-column>
        <e-treegrid-column field="Duration" headerText="Duration" textAlign="Right" width="100"></e-treegrid-column>
    </e-treegrid-columns>
</ejs-treegrid>
public class TreeGridItems
{
    public TreeGridItems() { }
    public int TaskId { get; set; }
    public string TaskName { get; set; }
    public DateTime StartDate { get; set; }
    public int Duration { get; set; }
    public List<TreeGridItems> Children { get; set; }

    public static List<TreeGridItems> GetTreeData()
    {
        List<TreeGridItems> BusinessObjectCollection = new List<TreeGridItems>();

        TreeGridItems Record1 = null;

        Record1 = new TreeGridItems()
        {
            TaskId = 1,
            TaskName = "Planning",
            StartDate = new DateTime(2016, 06, 07),
            Duration = 5,
            Children = new List<TreeGridItems>(),
        };
        TreeGridItems Child1 = new TreeGridItems()
        {
            TaskId = 2,
            TaskName = "Plan timeline",
            StartDate = new DateTime(2016, 06, 07),
            Duration = 5
        };

        TreeGridItems Child2 = new TreeGridItems()
        {
            TaskId = 3,
            TaskName = "Plan budget",
            StartDate = new DateTime(2016, 06, 07),
            Duration = 5
        };
        TreeGridItems Child3 = new TreeGridItems()
        {
            TaskId = 4,
            TaskName = "Allocate resources",
            StartDate = new DateTime(2016, 06, 07),
            Duration = 5
        };
        Record1.Children.Add(Child1);
        Record1.Children.Add(Child2);
        Record1.Children.Add(Child3);
        TreeGridItems Record2 = new TreeGridItems()
        {
            TaskId = 6,
            TaskName = "Design",
            StartDate = new DateTime(2021, 08, 25),
            Duration = 3,
            Children = new List<TreeGridItems>()
        };
        TreeGridItems Child5 = new TreeGridItems()
        {
            TaskId = 7,
            TaskName = "Software Specification",
            StartDate = new DateTime(2021, 08, 25),
            Duration = 3
        };

        TreeGridItems Child6 = new TreeGridItems()
        {
            TaskId = 8,
            TaskName = "Develop prototype",
            StartDate = new DateTime(2021, 08, 25),
            Duration = 3
        };
        TreeGridItems Child7 = new TreeGridItems()
        {
            TaskId = 9,
            TaskName = "Get approval from customer",
            StartDate = new DateTime(2024, 06, 27),
            Duration = 2
        };
        Record2.Children.Add(Child5);
        Record2.Children.Add(Child6);
        Record2.Children.Add(Child7);
        BusinessObjectCollection.Add(Record1);
        BusinessObjectCollection.Add(Record2);
        return BusinessObjectCollection;
    }
}

Sorting in ASP.NET Core TreeGrid

Enable Filtering

Filtering enables users to view a subset of rows matching specific criteria. This reduces data volume and helps users focus on relevant information.

Enable filtering by setting allowFiltering property as true. Filtering feature can be customized using e-treegrid-filtersettings tag helper.

CSHTML
CSHTML.cs
@{
    ....
    var data = TreeGridItems.GetTreeData();
}

<ejs-treegrid id="TreeGrid" dataSource="@data" allowFiltering="true" allowPaging="true" allowSorting="true" childMapping="Children" treeColumnIndex="1">
    <e-treegrid-filtersettings type="FilterBar" hierarchyMode="Parent" mode="Immediate"></e-treegrid-filtersettings>
    <e-treegrid-pagesettings pageSize="10"></e-treegrid-pagesettings>
    <e-treegrid-columns>
        <e-treegrid-column field="TaskId" headerText="Task ID" textAlign="Right" width="70"></e-treegrid-column>
        <e-treegrid-column field="TaskName" headerText="Task Name" width="200"></e-treegrid-column>
        <e-treegrid-column field="StartDate" headerText=" Start Date" textAlign="Right" format="yMd" type="date" width="100"></e-treegrid-column>
        <e-treegrid-column field="Duration" headerText="Duration" textAlign="Right" width="90"></e-treegrid-column>
    </e-treegrid-columns>
</ejs-treegrid>
public class TreeGridItems
{
    public TreeGridItems() { }
    public int TaskId { get; set; }
    public string TaskName { get; set; }
    public DateTime StartDate { get; set; }
    public int Duration { get; set; }
    public List<TreeGridItems> Children { get; set; }

    public static List<TreeGridItems> GetTreeData()
    {
        List<TreeGridItems> BusinessObjectCollection = new List<TreeGridItems>();

        TreeGridItems Record1 = null;

        Record1 = new TreeGridItems()
        {
            TaskId = 1,
            TaskName = "Planning",
            StartDate = new DateTime(2016, 06, 07),
            Duration = 5,
            Children = new List<TreeGridItems>(),
        };
        TreeGridItems Child1 = new TreeGridItems()
        {
            TaskId = 2,
            TaskName = "Plan timeline",
            StartDate = new DateTime(2016, 06, 07),
            Duration = 5
        };

        TreeGridItems Child2 = new TreeGridItems()
        {
            TaskId = 3,
            TaskName = "Plan budget",
            StartDate = new DateTime(2016, 06, 07),
            Duration = 5
        };
        TreeGridItems Child3 = new TreeGridItems()
        {
            TaskId = 4,
            TaskName = "Allocate resources",
            StartDate = new DateTime(2016, 06, 07),
            Duration = 5
        };
        Record1.Children.Add(Child1);
        Record1.Children.Add(Child2);
        Record1.Children.Add(Child3);
        TreeGridItems Record2 = new TreeGridItems()
        {
            TaskId = 6,
            TaskName = "Design",
            StartDate = new DateTime(2021, 08, 25),
            Duration = 3,
            Children = new List<TreeGridItems>()
        };
        TreeGridItems Child5 = new TreeGridItems()
        {
            TaskId = 7,
            TaskName = "Software Specification",
            StartDate = new DateTime(2021, 08, 25),
            Duration = 3
        };

        TreeGridItems Child6 = new TreeGridItems()
        {
            TaskId = 8,
            TaskName = "Develop prototype",
            StartDate = new DateTime(2021, 08, 25),
            Duration = 3
        };
        TreeGridItems Child7 = new TreeGridItems()
        {
            TaskId = 9,
            TaskName = "Get approval from customer",
            StartDate = new DateTime(2024, 06, 27),
            Duration = 2
        };
        Record2.Children.Add(Child5);
        Record2.Children.Add(Child6);
        Record2.Children.Add(Child7);
        BusinessObjectCollection.Add(Record1);
        BusinessObjectCollection.Add(Record2);
        return BusinessObjectCollection;
    }
}

Filtering in ASP.NET Core TreeGrid Conrtol

NOTE

View Sample in GitHub.

Handling errors

Error handling in Tree Grid identifies exceptions and notifies them through the actionFailure event. When configuring the Tree Grid or enabling specific features through its API, mistakes can occur. The actionFailure event can be used to manage these errors. This event triggers when such mistakes happen. The actionFailure event handles various scenarios, including:

For CRUD operations, row drag and drop, and persisting the selection, ensure the isPrimaryKey property is mapped to a unique data column. Failure to do so will cause an error.
Paging is not supported with virtualization. Enabling paging with virtualization will result in an error.
To render the Tree Grid, map either the dataSource or columns property. Failure to do so will result in an error.
Freeze columns by mapping either isFrozen or frozenColumns. Enabling both properties simultaneously will result in an error.
The detailTemplate is not supported with virtualization and stacked header. Enabling them with these features will result in an error.
The frozenRows and frozenColumns are not supported with rowTemplate, detailTemplate, and cell editing. Enabling them with these features will result in an error.
In stacked header, the freeze direction is incompatible with column reordering.
Selection functionality is not supported when using rowTemplate. Enabling both properties simultaneously will result in an error.
Set the treeColumnIndex value to display the tree structure. Make sure the value does not exceed the total column count, or it will result in an error.
For virtualization, do not specify height and width in percentages. Using percentages will result in an error.
When using the default filter (filterbar) type, do not apply the other filterType to columns within the same tree grid, as this will result in an error.
In Tree Grid avoid enabling idMapping and childMapping simultaneously. Enabling both properties at the same time will result in an error.
The showCheckbox column should only be defined in the tree column. Defining it elsewhere will result in an error.
The textAlign right is not applicable for tree columns in the Tree Grid. Enabling right alignment for tree columns will result in an error.

The following code example shows how to use the actionFailure event in the Tree Grid control to display an exception when isPrimaryKey are not configured properly in the Tree Grid.

CSHTML
ErrorHandling.cs
<ejs-treegrid id="TreeGrid" dataSource="@ViewBag.dataSource" height="400" childMapping="Children" treeColumnIndex="1" actionFailure="actionFailure" >
    <e-treegrid-editsettings allowAdding="true" allowEditing="true" allowDeleting="true"></e-treegrid-editsettings>
    <e-treegrid-columns>
        <e-treegrid-column field="TaskId" headerText="Task ID" textAlign="Right" width="100"></e-treegrid-column>
        <e-treegrid-column field="TaskName" headerText="Task Name" editType="stringedit" width="190"></e-treegrid-column>
        <e-treegrid-column field="StartDate" headerText="Start Date" editType="datepickeredit" textAlign="Right" format="yMd" type="date" width="130"></e-treegrid-column>
        <e-treegrid-column field="Duration" headerText="Duration" editType="numericedit" textAlign="Right" width="120"></e-treegrid-column>
    </e-treegrid-columns>
</ejs-treegrid>
<script>
    function actionFailure(e) {
       var span = document.createElement('span');
       this.element.parentNode.insertBefore(span, this.element);
       span.style.color = '#FF0000'
       span.innerHTML = e.error[0];
    }
</script>
public class HomeController : Controller
{
    public ActionResult Index()
    {
        return View(TreeGridItems.GetTreeData());
    }
}
public class TreeGridItems
{
    public TreeGridItems() { }
    public int TaskId { get; set; }
    public string TaskName { get; set; }
    public DateTime StartDate { get; set; }
    public int Duration { get; set; }
    public List<TreeGridItems> Children { get; set; }

    public static List<TreeGridItems> GetTreeData()
    {
        List<TreeGridItems> BusinessObjectCollection = new List<TreeGridItems>();

        TreeGridItems Record1 = null;

        Record1 = new TreeGridItems()
        {
            TaskId = 1,
            TaskName = "Planning",
            StartDate = new DateTime(2016, 06, 07),
            Duration = 5,
            Children = new List<TreeGridItems>(),
        };
        TreeGridItems Child1 = new TreeGridItems()
        {
            TaskId = 2,
            TaskName = "Plan timeline",
            StartDate = new DateTime(2016, 06, 07),
            Duration = 5
        };

        TreeGridItems Child2 = new TreeGridItems()
        {
            TaskId = 3,
            TaskName = "Plan budget",
            StartDate = new DateTime(2016, 06, 07),
            Duration = 5
        };
        TreeGridItems Child3 = new TreeGridItems()
        {
            TaskId = 4,
            TaskName = "Allocate resources",
            StartDate = new DateTime(2016, 06, 07),
            Duration = 5
        };
        Record1.Children.Add(Child1);
        Record1.Children.Add(Child2);
        Record1.Children.Add(Child3);
        TreeGridItems Record2 = new TreeGridItems()
        {
            TaskId = 6,
            TaskName = "Design",
            StartDate = new DateTime(2021, 08, 25),
            Duration = 3,
            Children = new List<TreeGridItems>()
        };
        TreeGridItems Child5 = new TreeGridItems()
        {
            TaskId = 7,
            TaskName = "Software Specification",
            StartDate = new DateTime(2021, 08, 25),
            Duration = 3
        };

        TreeGridItems Child6 = new TreeGridItems()
        {
            TaskId = 8,
            TaskName = "Develop prototype",
            StartDate = new DateTime(2021, 08, 25),
            Duration = 3
        };
        TreeGridItems Child7 = new TreeGridItems()
        {
            TaskId = 9,
            TaskName = "Get approval from customer",
            StartDate = new DateTime(2024, 06, 27),
            Duration = 2
        };
        Record2.Children.Add(Child5);
        Record2.Children.Add(Child6);
        Record2.Children.Add(Child7);
        BusinessObjectCollection.Add(Record1);
        BusinessObjectCollection.Add(Record2);
        return BusinessObjectCollection;
    }
}

ASP.NET CORE Tree Grid with Handling errors

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Getting Started with ASP.NET Core TreeGrid Control

Prerequisites

Create ASP.NET Core web application with Razor pages

Install ASP.NET Core package in the application

Add Syncfusion^® ASP.NET Core Tag Helper

Add stylesheet and script resources

Register Syncfusion^® Script Manager

Add ASP.NET Core TreeGrid control

Defining Row Data

Defining Columns

Enable Paging

Enable Sorting

Enable Filtering

Handling errors

See also

Getting Started with ASP.NET Core TreeGrid Control

Prerequisites

Create ASP.NET Core web application with Razor pages

Install ASP.NET Core package in the application

Add Syncfusion® ASP.NET Core Tag Helper

Add stylesheet and script resources

Register Syncfusion® Script Manager

Add ASP.NET Core TreeGrid control

Defining Row Data

Defining Columns

Enable Paging

Enable Sorting

Enable Filtering

Handling errors

See also

Add Syncfusion^® ASP.NET Core Tag Helper

Register Syncfusion^® Script Manager