Getting Started with ASP.NET Core TreeGrid Control

16 Feb 202424 minutes to read

This section briefly explains about how to include ASP.NET Core TreeGrid control in your ASP.NET Core application using Visual Studio.

Prerequisites

System requirements for ASP.NET Core controls

Create ASP.NET Core web application with Razor pages

Install ASP.NET Core package in the application

To add ASP.NET Core controls in the application, open the NuGet package manager in Visual Studio (Tools → NuGet Package Manager → Manage NuGet Packages for Solution), search for Syncfusion.EJ2.AspNet.Core and then install it. Alternatively, you can utilize the following package manager command to achieve the same.

Package Manager
Install-Package Syncfusion.EJ2.AspNet.Core -Version 25.1.35

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/ej2/25.1.35/fluent.css" />
    <!-- Syncfusion ASP.NET Core controls scripts -->
    <script src="https://cdn.syncfusion.com/ej2/25.1.35/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>

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

NOTE

childMapping specifies the mapping property path for subtasks in dataSource.
treeColumnIndex specifies the index of the column that needs to have the expander button.

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

The paging feature enables users to view the treegrid record in a paged view. It can be enabled by setting the 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

The sorting feature enables you to order the records. It can be enabled by setting the 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

The filtering feature enables you to view reduced amount of records based on filter criteria. It can be enabled by setting the 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.