Blazor QueryBuilder Component in WebAssembly App using Visual Studio

24 Jan 20225 minutes to read

This article provides a step-by-step instructions for building Blazor WebAssembly App with Blazor QueryBuilder component using Visual Studio.

Prerequisites

Create a Blazor WebAssembly App in Visual Studio

You can create Blazor WebAssembly App using Visual Studio in one of the following ways,

Install Syncfusion Blazor QueryBuilder NuGet in the App

Syncfusion Blazor components are available in nuget.org. To use Syncfusion Blazor components in the application, add reference to the corresponding NuGet. Refer to NuGet packages topic for available NuGet packages list with component details.

To add Blazor QueryBuilder component in the app, open the NuGet package manager in Visual Studio (Tools → NuGet Package Manager → Manage NuGet Packages for Solution), search for Syncfusion.Blazor.QueryBuilder and then install it.

Register Syncfusion Blazor Service

Open ~/_Imports.razor file and import the Syncfusion.Blazor namespace.

@using Syncfusion.Blazor

Now, Open ~/Program.cs file and register the Syncfusion Blazor Service in the client web app. Here, Syncfusion Blazor Service is registered by setting IgnoreScriptIsolation property as true to load the scripts externally in the next steps.

using Microsoft.AspNetCore.Components.Web;
using Microsoft.AspNetCore.Components.WebAssembly.Hosting;
using Syncfusion.Blazor;

var builder = WebAssemblyHostBuilder.CreateDefault(args);
builder.RootComponents.Add<App>("#app");
builder.RootComponents.Add<HeadOutlet>("head::after");

builder.Services.AddScoped(sp => new HttpClient { BaseAddress = new Uri(builder.HostEnvironment.BaseAddress) });

builder.Services.AddSyncfusionBlazor(options => { options.IgnoreScriptIsolation = true; });
await builder.Build().RunAsync();
....
using Syncfusion.Blazor;

namespace BlazorApplication
{
    public class Program
    {
        public static async Task Main(string[] args)
        {
            ....
            builder.Services.AddSyncfusionBlazor(options => { options.IgnoreScriptIsolation = true; });
            await builder.Build().RunAsync();
        }
    }
}

Add Style Sheet

Checkout the Blazor Themes topic to learn different ways (Static Web Assets, CDN and CRG) to refer themes in Blazor application, and to have the expected appearance for Syncfusion Blazor components. Here, the theme is referred using Static Web Assets.

To add theme to the app, open the NuGet package manager in Visual Studio (Tools → NuGet Package Manager → Manage NuGet Packages for Solution), search for Syncfusion.Blazor.Themes and then install it. Then, the theme style sheet from NuGet can be referred inside the <head> of wwwroot/index.html file in client web app.

<head>
    ...
    <link href="_content/Syncfusion.Blazor.Themes/bootstrap5.css" rel="stylesheet" />
</head>

Add Script Reference

Checkout Adding Script Reference topic to learn different ways to add script reference in Blazor Application. In this getting started walk-through, the required scripts are referred using Static Web Assets externally inside the <head> of wwwroot/index.html file in client web app.

<head>
    ...
    <link href="_content/Syncfusion.Blazor.Themes/bootstrap5.css" rel="stylesheet" />
    <script src="https://cdn.syncfusion.com/blazor/19.4.38/syncfusion-blazor.min.js" type="text/javascript"></script>
</head>

Syncfusion recommends to reference scripts using Static Web Assets, CDN and CRG by disabling JavaScript isolation for better loading performance of the Blazor application. Generate scripts and theme assets using CRG by selecting the components you were using in the application.

Add Blazor QueryBuilder component

  • Open ~/_Imports.razor file or any other page under the ~/Pages folder where the component is to be added and import the Syncfusion.Blazor.QueryBuilder namespace.
@using Syncfusion.Blazor
@using Syncfusion.Blazor.QueryBuilder
  • Now, add the Syncfusion QueryBuilder component in razor file. Here, the QueryBuilder component is added in the ~/Pages/Index.razor file under the ~/Pages folder.
<SfQueryBuilder TValue="EmployeeDetails">
<QueryBuilderColumns>
    <QueryBuilderColumn Field="EmployeeID" Label="Employee ID" Type="ColumnType.Number"></QueryBuilderColumn>
    <QueryBuilderColumn Field="FirstName" Label="First Name" Type="ColumnType.String"></QueryBuilderColumn>
    <QueryBuilderColumn Field="TitleOfCourtesy" Label="Title of Courtesy" Type="ColumnType.Boolean" Values="Values"></QueryBuilderColumn>
    <QueryBuilderColumn Field="Title" Label="Title" Type="ColumnType.String"></QueryBuilderColumn>
    <QueryBuilderColumn Field="HireDate" Label="Hire Date" Type="ColumnType.Date"></QueryBuilderColumn>
    <QueryBuilderColumn Field="Country" Label="Country" Type="ColumnType.String"></QueryBuilderColumn>
    <QueryBuilderColumn Field="City" Label="City" Type="ColumnType.String"></QueryBuilderColumn>
</QueryBuilderColumns>
</SfQueryBuilder>

@code {
    private string[] Values = new string[] { "Mr.", "Mrs." };

    public class EmployeeDetails
    {
        public int EmployeeID { get; set; }
        public string FirstName { get; set; }
        public bool TitleOfCourtesy { get; set; }
        public string Title { get; set; }
        public DateTime HireDate { get; set; }
        public string Country { get; set; }
        public string City { get; set; }
    }
}
  • Press Ctrl+F5 (Windows) or +F5 (macOS) to run the app. Then, the Syncfusion Blazor QueryBuilder component will be rendered in the default web browser.

Blazor QueryBuilder