Bind data to Blazor components using WebApiAdaptor and perform CRUD
10 Feb 202319 minutes to read
In this topic, you can learn how to retrieve data from WebApi Controller, bind to Grid component using WebApiAdaptor of SfDataManger, and perform CRUD operations.
You can use the WebApiAdaptor of SfDataManager to interact with Web APIs created with OData endpoint. The WebApiAdaptor is extended from the ODataAdaptor. Hence, to use WebApiAdaptor, the endpoint should understand the OData formatted queries sent along with the request.
To enable the OData query option for Web API, Refer to this documentation.
Prerequisite software
The following software are needed
- Visual Studio 2019 v16.8.0 Preview 3.0 or later
- .NET SDK 5.0 RC2 or later.
Create the database
Open Visual Studio 2019 Preview, select View -> SQL Server Object Explorer. Right-click on the Databases folder to create a new Database and name it as OrdersDetails.
Right-click on the Tables folder of the created database and click Add New Table.
Use the following query to add a new table named Orders.
Create Table Orders(
OrderID BigInt Identity(1,1) Primary Key Not Null,
CustomerID Varchar(100) Not Null,
Freight int Null,
OrderDate datetime null
)
Now, the Orders table design will look like below. Click on the Update button.
Now, click on Update Database.
Create Blazor Server Application
Open Visual Studio 2019 and follow the steps in the below documentation to create the Blazor Server Application.
Generate DbContext and model class from the database
Now, you need to scaffold DbContext and model classes from the existing OrdersDetails database. To perform scaffolding and work with the SQL Server database in our application, install the following NuGet packages.
Run the following commands in the Package Manager Console.
- Install-Package Microsoft.EntityFrameworkCore.Tools -Version 3.0.0: This package creates database context and model classes from the database.
- Install-Package Microsoft.EntityFrameworkCore.SqlServer -Version 3.0.0: The database provider that allows Entity Framework Core to work with SQL Server.
Once the above packages are installed, you can scaffold DbContext and Model classes. Run the following command in the Package Manager Console.
Scaffold-DbContext “Data Source=(localdb)\MSSQLLocalDB;Initial Catalog=OrdersDetails;Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False” Microsoft.EntityFrameworkCore.SqlServer -OutputDir Data
The above scaffolding command contains the following details for creating DbContext and model classes for the existing database and its tables.
- Connection string: Data Source=(localdb)\MSSQLLocalDB;Initial Catalog=OrdersDetails;Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False
- Data provider: Microsoft.EntityFrameworkCore.SqlServer
- Output directory: -OutputDir Data
After running the above command, OrdersDetailsContext.cs and Orders.cs files will be created under the WebAPICRUDServerApp.Data folder as follows.
You can see that OrdersDetailsContext.cs file contains the connection string details in the OnConfiguring method.
using System;
using System.Collections.Generic;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata;
namespace WebAPICRUDServerApp.Data
{
public partial class OrdersDetailsContext : DbContext
{
public OrdersDetailsContext()
{
}
public OrdersDetailsContext(DbContextOptions<OrdersDetailsContext> options)
: base(options)
{
}
public virtual DbSet<Order> Orders { get; set; } = null!;
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
if (!optionsBuilder.IsConfigured)
{
optionsBuilder.UseSqlServer("Data Source=(localdb)\\MSSQLLocalDB;Initial Catalog=OrdersDetails;Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False");
}
}
...
}
}It is not recommended to have a connection string with sensitive information in the OrdersDetailsContext.cs file, so the connection string is moved to the appsettings.json file.
{
"Logging": {
"LogLevel": {
"Default": "Information",
"Microsoft.AspNetCore": "Warning"
}
},
"AllowedHosts": "*",
"ConnectionStrings": {
"OrdersDetailsDatabase": "Data Source=(localdb)\\MSSQLLocalDB;Initial Catalog=OrdersDetails;Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False"
}
}Now, the DbContext must be configured using connection string and registered as scoped service using the AddDbContext method in Startup.cs for .NET 5 and .NET 3.X application and in Program.cs file in .NET 6 application.
builder.Services.AddDbContext<OrdersDetailsContext>(option =>
option.UseSqlServer(builder.Configuration.GetConnectionString("OrdersDetailsDatabase")));namespace ODataServiceProject
{
public class Startup
{
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public IConfiguration Configuration { get; }
// This method gets called by the runtime. Use this method to add services to the container.
// For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
public void ConfigureServices(IServiceCollection services)
{
services.AddDbContext<OrdersDetailsContext>(option =>
option.UseSqlServer(Configuration.GetConnectionString("OrdersDetailsDatabase")));
...
}
....
....
}
}Creating API Controller
The application is now configured to connect with the OrdersDetails database using Entity Framework. Now, it’s time to consume data from the OrdersDetails database. To do so, you need a Web API controller to serve data from the DbContext to the Blazor application.
To create a Web API controller, right-click the Controller folder in the Server project and select Add -> New Item -> API controller with read/write actions to create a new Web API controller. We are naming this controller as OrdersController as it returns Orders table records.
Now, replace the Web API controller with the following code which contains code to handle CRUD operations in the Orders table.
using Microsoft.AspNetCore.Mvc;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using WebAPICRUDServerApp.Data;
namespace WebAPICRUDServerApp
{
[Route("api/[controller]")]
[ApiController]
public class OrdersController : ControllerBase
{
private OrdersDetailsContext _context;
public OrdersController(OrdersDetailsContext context)
{
_context = context;
}
// GET: api/<OrdersController>
[HttpGet]
public object Get()
{
return new { Items = _context.Orders, Count = _context.Orders.Count() };
}
// POST api/<OrdersController>
[HttpPost]
public void Post([FromBody] Orders book)
{
_context.Orders.Add(book);
_context.SaveChanges();
}
// PUT api/<OrdersController>
[HttpPut]
public void Put(long id, [FromBody] Orders book)
{
Orders _book = _context.Orders.Where(x => x.OrderId.Equals(book.OrderId)).FirstOrDefault();
_book.CustomerId = book.CustomerId;
_book.Freight = book.Freight;
_book.OrderDate = book.OrderDate;
_context.SaveChanges();
}
// DELETE api/<OrdersController>
[HttpDelete("{id}")]
public void Delete(long id)
{
Orders _book = _context.Orders.Where(x => x.OrderId.Equals(id)).FirstOrDefault();
_context.Orders.Remove(_book);
_context.SaveChanges();
}
}
}- For .NET 6 and .NET 7 applications open Program.cs file and add MapDefaultControllerRoute in Configure method as follows.
- For .NET 5 and .NET 3.X applications open Startup.cs file and add MapDefaultControllerRoute in Configure method as follows.
......
app.UseRouting();
app.MapDefaultControllerRoute();
app.MapBlazorHub();
app.MapFallbackToPage("/_Host");
app.Run();public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
...
app.UseEndpoints(endpoints =>
{
endpoints.MapDefaultControllerRoute();
endpoints.MapBlazorHub();
endpoints.MapFallbackToPage("/_Host");
});
}Add Syncfusion Blazor DataGrid package
To add Syncfusion components into the project, right-click Dependencies and select the Manage NuGet Packages.
Now, in the Browse tab, search and install the Syncfusion.Blazor.Grid NuGet package.
NOTE
For this demo, Syncfusion.Blazor(19.1.0.66) NuGet package is used. A new Syncfusion.Blazor NuGet package with new enhancement has been released in our every-week release and main release. So, you can check and update to the latest versions by using this link.
Open _Import.razor file and add the following namespaces which are required to use Syncfusion Blazor components in this application.
@using Syncfusion.Blazor
@using Syncfusion.Blazor.Data
@using Syncfusion.Blazor.Grids
@using WebAPICRUDServerApp.DataOpen Startup.cs file in .NET 3.X and .NET 5 applications, Program.cs file in .NET 6 and .NET 7 application and register the Syncfusion service in the ConfigureServices method as follows.
builder.Services.AddDbContext<OrdersDetailsContext>(option =>
option.UseSqlServer(builder.Configuration.GetConnectionString("OrdersDetailsDatabase")));
builder.Services.AddRazorPages();
builder.Services.AddServerSideBlazor();
builder.Services.AddSingleton<WeatherForecastService>();
builder.Services.AddSyncfusionBlazor();public void ConfigureServices(IServiceCollection services)
{
services.AddDbContext<OrdersDetailsContext>(option => option.UseSqlServer(Configuration.GetConnectionString("OrdersDetailsDatabase")));
services.AddRazorPages();
services.AddServerSideBlazor();
services.AddSingleton<WeatherForecastService>();
services.AddSyncfusionBlazor();
}Themes provide life to components. Syncfusion Blazor has different themes. They are:
- Bootstrap4
- Material
- Office 365
- Bootstrap
- High Contrast
In this demo application, the Bootstrap4 theme will be used.
-
For .NET 6 app, add theme in the
<head>of the ~/Pages/_Layout.cshtml file. -
For .NET 3.X, .NET 5 and .NET 7 app, add theme in the
<head>of the ~/Pages/_Host.cshtml file.
<link href="_content/Syncfusion.Blazor.Themes/fabric.css" rel="stylesheet" /><link href="_content/Syncfusion.Blazor.Themes/fabric.css" rel="stylesheet" />Add Syncfusion Blazor DataGrid component to an application
In previous steps, we have successfully configured the Syncfusion Blazor package in the application. Now, we can add the grid component to the Index.razor page.
<SfGrid TValue="Orders"></SfGrid>Binding data to Blazor DataGrid component using WebApiAdaptor
To consume data from the WebApi Controller, we need to add the SfDataManager with WebApiAdaptor. Refer to the following documentation for more details on WebApiAdaptor.
<SfGrid TValue="Orders">
<SfDataManager Url="api/Orders" Adaptor="Adaptors.WebApiAdaptor"></SfDataManager>
</SfGrid>Grid columns can be defined by using the GridColumn component. We are going to create columns using the following code.
<SfGrid TValue="Orders">
<SfDataManager Url="api/Orders" Adaptor="Adaptors.WebApiAdaptor"></SfDataManager>
<GridColumns>
<GridColumn Field=@nameof(Orders.OrderId) HeaderText="Order ID" IsPrimaryKey="true" Visible="false" TextAlign="TextAlign.Right" Width="120"></GridColumn>
<GridColumn Field=@nameof(Orders.CustomerId) HeaderText="Customer Name" Width="150"></GridColumn>
<GridColumn Field=@nameof(Orders.OrderDate) HeaderText=" Order Date" Format="d" Type="ColumnType.Date" TextAlign="TextAlign.Right" Width="130"></GridColumn>
<GridColumn Field=@nameof(Orders.Freight) HeaderText="Freight" Format="C2" TextAlign="TextAlign.Right" Width="120"></GridColumn>
</GridColumns>
</SfGrid>When you run the application, the Get() method will be called in your API controller.
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using WebAPICRUDServerApp.Data;
namespace WebAPICRUDServerApp
{
[Route("api/[controller]")]
[ApiController]
public class OrdersController : ControllerBase
{
private OrdersDetailsContext _context;
public OrdersController(OrdersDetailsContext context)
{
_context = context;
}
// GET: api/<OrdersController>
[HttpGet]
public object Get()
{
return new { Items = _context.Orders, Count = _context.Orders.Count() };
}
...
}
}The response object from the Web API should contain the properties, Items and Count, whose values are a collection of entities and the total count of the entities, respectively.
The sample response object should look like this:
{
"Items": [{..}, {..}, {..}, ...],
"Count": 830
}
Handling CRUD operations with our Syncfusion Blazor DataGrid component
You can enable editing in the grid component using the GridEditSettings component. Grid provides various modes of editing options such as Inline/Normal, Dialog, and Batch editing.
Here, we are using Inline edit mode and used Toolbar property to show toolbar items for editing.
We have added the DataGrid Editing and Toolbar code with previous Grid model.
<SfGrid TValue="Orders" Toolbar="@(new List<string>() { "Add", "Edit", "Delete", "Cancel", "Update" })">
<SfDataManager Url="api/Orders" Adaptor="Adaptors.WebApiAdaptor"></SfDataManager>
<GridEditSettings AllowAdding="true" AllowDeleting="true" AllowEditing="true" Mode="EditMode.Normal"></GridEditSettings>
<GridColumns>
<GridColumn Field=@nameof(Orders.OrderId) HeaderText="Order ID" IsPrimaryKey="true" Visible="false" TextAlign="TextAlign.Right" Width="120"></GridColumn>
<GridColumn Field=@nameof(Orders.CustomerId) HeaderText="Customer Name" Width="150"></GridColumn>
<GridColumn Field=@nameof(Orders.OrderDate) HeaderText=" Order Date" Format="d" Type="ColumnType.Date" TextAlign="TextAlign.Right" Width="130"></GridColumn>
<GridColumn Field=@nameof(Orders.Freight) HeaderText="Freight" Format="C2" TextAlign="TextAlign.Right" Width="120"></GridColumn>
</GridColumns>
</SfGrid>NOTE
Normal editing is the default edit mode for the DataGrid component. Set the IsPrimaryKey property of Column as true for a particular column, whose value is a unique value for editing purposes.
Insert a row
To insert a new row, click the Add toolbar button. The new record edit form will look like below.
Clicking the Update toolbar button will insert the record in the Orders table by calling the following POST method of the Web API.
public void Post([FromBody] Orders book)
{
_context.Orders.Add(book);
_context.SaveChanges();
}
Update a row
To edit a row, select any row and click the Edit toolbar button. The edit form will look like below. Edit the Customer Name column.
Clicking the Update toolbar button will update the record in the Orders table by calling the following PUT method of the Web API.
public void Put(long id, [FromBody] Orders book)
{
Orders _book = _context.Orders.Where(x => x.OrderId.Equals(book.OrderId)).FirstOrDefault();
_book.CustomerId = book.CustomerId;
_book.Freight = book.Freight;
_book.OrderDate = book.OrderDate;
_context.SaveChanges();
}
Delete a row
To delete a row, select any row and click the Delete toolbar button. Deleting operation will send a DELETE request to the Web API with the selected record`s primary key value to remove the corresponding record from the Orders table.
public void Delete(long id)
{
Orders _book = _context.Orders.Where(x => x.OrderId.Equals(id)).FirstOrDefault();
_context.Orders.Remove(_book);
_context.SaveChanges();
}NOTE
Find the sample from this Github location.