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Integrate the Web API into an Existing XAF Blazor Application

  • 3 minutes to read

This topic describes how to add the Web API service to a Blazor Server project.

Add Web API Service: Core Functionality

Install NuGet Packages

Install the following NuGet packages to the Blazor Server project (MySolution.Blazor.Server):

  • DevExpress.ExpressApp.WebApi
  • Swashbuckle.AspNetCore
  • DevExpress.ExpressApp.WebApi.Xpo - XPO applications only

See the following topic for more information on how to install DevExpress NuGet packages: Install DevExpress Controls Using NuGet Packages.

Add Service Configuration Code

Use the code below to configure services for the Web API:

File: MySolution.Blazor.Server\Startup.cs

using DevExpress.ExpressApp.WebApi.Services;
using Microsoft.OpenApi.Models;
using Microsoft.AspNetCore.OData;
// ...
public void ConfigureServices(IServiceCollection services) {
// ...     
    services.AddXafWebApi(Configuration, options => { 
        // To make a Business Object available via Web API and
        // to generate GET, POST, PUT, and DELETE HTTP methods for it,
        // uncomment the following line.
        // !!!
        // options.BusinessObject<YourBusinessObject>();
        // !!!
    // In EF Core applications, do nothing. 
    // In XPO applications, uncomment the following line.
    // !!!
    // .AddXpoServices()
    // !!!
    services.AddControllers().AddOData((options, serviceProvider) => {
            .AddRouteComponents("api/odata", new EdmModelBuilder(serviceProvider).GetEdmModel())
    services.AddSwaggerGen(c => {
        c.SwaggerDoc("v1", new OpenApiInfo {
            Title = "MySolution API",
            Version = "v1",
            Description = @"Use AddXafWebApi(Configuration, options) in the MySolution.Blazor.Server\Startup.cs file to make Business Objects available in the Web API."

public void Configure(IApplicationBuilder app, IWebHostEnvironment env) {
    if(env.IsDevelopment()) {
        // ...
        app.UseSwaggerUI(c => {
            c.SwaggerEndpoint("/swagger/v1/swagger.json", "MySolution WebApi v1");
    // ...

Configure Authentication Settings (Optional)

The Web API supports all standard ASP.NET Core authentication techniques. See the following topic for more information: Authentication in Web API projects.

Create Endpoints and Test the Web API

You can now create endpoints and test the Web API.

Add Web API Service: Additional Modules

You can enable additional Web API Service modules in an existing application. For instructions, please refer to the topic that describes the required module:

A number of modules are available to you right away, without the need for manual registration:


Additional modules listed above ship only as part of the DevExpress Universal Subscription.

See Also