how to authenticate user blazor in csharp

There are a few steps to authenticate users in Blazor using C#:

First, add the necessary packages to your project. In the ProjectName.Client project file, add the following lines:


<ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.Authentication" Version="5.0.5" />
</ItemGroup>
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In App.razor, add the CascadingAuthenticationState component to propagate authentication state changes throughout the application:


main.cs
<CascadingAuthenticationState>
    <Router ... />
</CascadingAuthenticationState>
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In Program.cs, configure the authentication provider with the appropriate settings. For example, to use the default IdentityServerProvider:


main.cs
builder.Services.AddOidcAuthentication(options =>
{
    options.ProviderOptions.Authority = "https://localhost:5001";
    options.ProviderOptions.ClientId = "ProjectName.Client";
    options.ProviderOptions.ResponseType = "code";
});
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Use the AuthorizeView component to restrict access to pages or components based on the user's authentication status or role:


main.cs
<AuthorizeView>
    <Authorized>
        <h1>Welcome, authenticated user!</h1>
    </Authorized>
    <NotAuthorized>
        <p>You need to log in to view this content.</p>
    </NotAuthorized>
</AuthorizeView>
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To handle user authentication events, inject the AuthenticationStateProvider and subscribe to the AuthenticationState changed event:


main.cs
@inject AuthenticationStateProvider AuthenticationStateProvider

@code {
    protected override async Task OnInitializedAsync()
    {
        var authState = await AuthenticationStateProvider.GetAuthenticationStateAsync();
        var user = authState.User;
        // do something with the user
    }

    private void HandleAuthenticationStateChanged(Task<AuthenticationState> task)
    {
        // handle the authentication state change
    }
}
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These are the basic steps to authenticate users in Blazor using C#. You may need to customize some of the steps based on your specific authentication requirements.

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