Blazor Server CRUD Operation Using MudBlazor UI Components[.NET6]

In this article, we are going to implement CRUD operation in .NET6 Blazor Server application using the MudBlazor UI components.

SignalR Connection:

A Blazor Server application works over a SignalR connection. A Blazor Server application creates a UI State memory at the server which will be interacted by the SignalR connections. If a SignalR connection got interrupted, then the client tries to maintain the same state of the application by initiating a new SignalR connection and uses the existing UI state memory at the server. App routing changes, event changes, data changes everything will be carried out by the SignalR connection without any page reload.

Blazor Components:

Create A .NET6 Blazor Server Application:

Pages/_Host.cshtml:- wwwroot:-

Install And Configure MudBlazor UI Library:

<link href="https://fonts.googleapis.com/css?family=Roboto:300,400,500,700&display=swap" rel="stylesheet" />
<link href="_content/MudBlazor/MudBlazor.min.css" rel="stylesheet" />

Now remove the existing CSS files inside of the 'Pages/_Layout.cshtml'.

<script src="_content/MudBlazor/MudBlazor.min.js"></script>

In .NET6 'Startup.cs' file is excluded all service registration added to the 'Program.cs' file. Now let's register the MudBlazor service into the 'Program.cs' file.

1. builder.Services.AddMudServices();

Now let's replace the content in 'Shared/MainLayout.razor' file.

1. @inherits LayoutComponentBase
2. <PageTitle>Dot6.BlazorServer.Crud.Learn</PageTitle>
3. <MudThemeProvider />
4. <MudDialogProvider />
5. <MudSnackbarProvider />
6. <MudLayout>
7. <MudAppBar Color="Color.Primary">
8. <MudText Typo="Typo.h4">Cakes Wold</MudText>
9. </MudAppBar>
10. <MudMainContent class="mt-4">
11. @Body
12. </MudMainContent>
13. </MudLayout>

• (Line: 5) The 'MudThemeProvider' component was added as global registration. It helps apply styles or colors to our sample application.
• (Line: 6) The 'MudDialogProvider' component was added as global registration. It is required to work with MudBlazor dialog.
• (Line: 7) The 'MudSnackbarProvider' component was added as global registration. It is required to display notification messages.
• (Line:  9&16) The 'MudLayout' component was added as a parent of all other components.
• (Line: 10-12) The 'MudAppBar' component added display a nice header menu.
• (Line: 13-14) The '@Body' a razor syntax that helps to render the Blazor page components and it was wrapped by the 'MudMainContent' component. The 'class="mt-4"'(margin-top) applying some margin between the 'MudAppBar' and 'MudMainContent' components.

Now let's run the application and check our app design.

SQL Sample Script:

CREATE TABLE [dbo].[Cake] (
    [Id]          INT             IDENTITY (1, 1) NOT NULL,
    [Name]        VARCHAR (MAX)   NULL,
    [Price]       DECIMAL (18, 2) NULL,
    [Description] VARCHAR (MAX)   NULL
);

Install EntityFramework Core And Configure Database Context:

1. namespace Dot6.BlazorServer.Crud.Learn.Data.Entities;
2. public class Cake
3. public int Id{get;set;}
4. public string Name{get;set;}
5. public decimal Price{get;set;}
6. public string Description{get;set;}

Now let's create the Database Context model like 'MyWorldDbContext.cs'

1. using Dot6.BlazorServer.Crud.Learn.Data.Entities;
2. using Microsoft.EntityFrameworkCore;
3. namespace Dot6.BlazorServer.Crud.Learn.Data;
4. public class MyWorldDbContext : DbContext
5. public MyWorldDbContext(DbContextOptions<MyWorldDbContext> options) : base(options)
6. public DbSet<Cake> Cake{get;set;}

Add the 'Cake.cs' and 'MyWorldDbContext.cs' namespace into the '_Import.razor'.

@using Dot6.BlazorServer.Crud.Learn.Data
@using Dot6.BlazorServer.Crud.Learn.Data.Entities

Add the database connection string into 'appsettings.Development.json' file.

"ConnectionStrings":{
    "MyWorldDbConnection":"your_connection"
}

Register the DatabaseContext.

1. builder.Services.AddDbContext<MyWorldDbContext>(options =>
2. options.UseSqlServer(builder.Configuration.GetConnectionString("MyWorldDbConnection"));

Read Operation:

1. @page "/"
2. @inject MyWorldDbContext _myworldDbContext;
3. <MudGrid Justify="Justify.Center" class="pr-4 pl-4">
4. @foreach (var cake in allCakes)
5. <MudItem xs="3">
6. <MudCard>
7. <MudCardHeader>
8. <CardHeaderContent>
9. <MudText Typo="Typo.body1">@cake.Name</MudText>
10. <MudText Typo="Typo.h6">@cake.Price $</MudText>
11. </CardHeaderContent>
12. </MudCardHeader>
13. <MudCardMedia Image="images/sample-cake.jpg" Height="250" />
14. <MudCardContent>
15. <MudText Typo="Typo.body2">@cake.Description</MudText>
16. </MudCardContent>
17. <MudCardActions>
18. <MudIconButton Icon="@Icons.Filled.Edit" Color="Color.Primary" />
19. <MudIconButton Icon="@Icons.Filled.Delete" Color="Color.Error" />
20. </MudCardActions>
21. </MudCard>
22. </MudItem>
23. </MudGrid>

• (Line: 2) Injected the 'MyWorldDbContext'.
• (Line: 4) Rendered the 'MudGrid' component. Here applied padding right&left like 'class="pr-4 pl-4"'.
• (Line: 5-27) Looping the collection of records by rendering the 'MudItem' component, inside it renders the 'MudCard' component.
• (Line: 15) Added a dummy image for display purposes(image added in folders of  'wwwroot/images').

Index.razor:(C# Code)

1. @code {
2. List<Cake> allCakes = new List<Cake>();
3. protected override async Task OnInitializedAsync()
4. allCakes = await _myworldDbContext.Cake.ToListAsync();

• (Line: 2)Initialized the collection of 'Cake' instance.
• (Line: 3-6) The 'OnInitialized' life cycle method invokes the database call to fetch all the records.

 Create Operation:

1. <MudDialog>
2. <DialogContent>
3. <MudTextField T="string" Label="Name" @bind-Value="cake.Name" />
4. <MudTextField T="decimal" Label="Price" @bind-Value="cake.Price" />
5. <MudTextField T="string" Label="Description" @bind-Value="cake.Description" Lines=4/>
6. </DialogContent>
7. <DialogActions>
8. <MudButton OnClick="Cancel">Cancel</MudButton>
9. <MudButton Color="Color.Primary" OnClick="Submit">Ok</MudButton>
10. </DialogActions>
11. </MudDialog>

1. @code {
2. [CascadingParameter] MudDialogInstance MudDialog { get; set; }
3. [Parameter] public Cake cake { get; set; } = new Cake();
4. private void Cancel()
5. MudDialog.Cancel();
6. private void Submit()
7. MudDialog.Close(DialogResult.Ok<Cake>(cake));

• (Line: 2) The 'MudDialogInstance' property gives control over the dialog.
• (Line: 4) The 'cake' property instance is used to bind the dialog fields and the instance of the property comes from the component that invokes the dialog.
• (Line: 6-9) The 'Cancel' method to close the dialog.
• (Line: 11-14) The 'Submit' method closes the dialog as well passe the dialog information to a component that invokes the component.

1. private async Task CreateAsync()
2. var parameters = new DialogParameters();
3. parameters.Add("cake", new Cake());
4. var dialog = await _dialogService.Show<AddOrUpdateCakeDialog>("Create A Post", parameters).Result;
5. if (dialog.Data != null)
6. Cake newCake = dialog.Data as Cake;
7. _myworldDbContext.Cake.Add(newCake);
8. await _myworldDbContext.SaveChangesAsync();
9. allCakes.Insert(0, newCake);

• (Line: 3-4) The 'DialogParameters' instance needs to use for adding parameters that can be sent to the dialog.
• (Line: 5) Using the 'IDialogService' we can open dialog by calling 'Show<T>()' where T(type) will be the dialog component. The 'Show<T>' has 2 params where 1st parameter will be the title for the dialog and 2nd parameter will be the data that passed to the dialog component.
• (Line: 7) Checking for data coming from the dialog.
• (Line: 9-11) Using entity framework database context saves the new record to the database.
• (Line: 13) Now updating the 'allCakes' collection property with our newly created record.

Update Operation:

1. <MudCardActions>
2. <MudIconButton Icon="@Icons.Filled.Edit" Color="Color.Primary" @onclick="(e => UpdateAsync(cake.Id))" />
3. <MudIconButton Icon="@Icons.Filled.Delete" Color="Color.Error" />
4. </MudCardActions>

• (Line: 2) The edit button registers with the 'UpdateAsync' click event.

Index.razor:(C# Part)

1. private async Task UpdateAsync(int id)
2. var parameters = new DialogParameters();
3. var cakeNeedToUpdate = allCakes.FirstOrDefault(_ => _.Id == id);
4. parameters.Add("cake", cakeNeedToUpdate);
5. var dialog = await _dialogService.Show<AddOrUpdateCakeDialog>("Update A Item", parameters).Result;
6. if (dialog.Data != null)
7. var updatedCake = dialog.Data as Cake;
8. _myworldDbContext.Cake.Update(updatedCake);
9. await _myworldDbContext.SaveChangesAsync();
10. allCakes.Remove(cakeNeedToUpdate);
11. allCakes.Insert(0, updatedCake);

• (Line: 3-5) Adding the record that needs to be updated as a parameter to the 'DailogParamters'.
• (Line: 9-11) Saving modified changes to the database.

Delete Operation:

1. <MudCardActions>
2. <MudIconButton Icon="@Icons.Filled.Edit" Color="Color.Primary" @onclick="(e => UpdateAsync(cake.Id))" />
3. <MudIconButton Icon="@Icons.Filled.Delete" Color="Color.Error" @onclick="(e => DeleteAsync(cake.Id))" />
4. </MudCardActions>

• (Line: 3) The 'Delete' button registered with 'DeleteAsync' click event

Index.razor:(C# Part)

1. private async Task DeleteAsync(int id)
2. bool? result = await _dialogService.ShowMessageBox(
3. "Delete Confirmation",
4. "Deleting can not be undone!",
5. yesText: "Delete!", cancelText: "Cancel");
6. if (result ?? false)
7. var cakeToRemove = await _myworldDbContext.Cake.FindAsync(id);
8. _myworldDbContext.Cake.Remove(cakeToRemove);
9. await _myworldDbContext.SaveChangesAsync();
10. allCakes.Remove(cakeToRemove);

• (Line: 3-6) MudBlazor 'MessageBox' are simple popups that can be easily used like 'warning' or 'confirmation' popups. So 'MessageBox' is also invoked by using 'IDialogService'. MessageBox on click 'cancelText' button returns 'null', if we click 'yesText' button then it returns 'true' value.
• (Line: 10-12) Deleting the record from the database.

Refer:

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