If you receive a zsh: command not found: dotnet error, make sure you opened a new terminal window. If you can't resolve the issue, use the I ran into an issue button to get help fixing the problem.
If you receive a dotnet: command not found error, make sure you opened a new terminal window. If you can't resolve the issue, use the I ran into an issue button to get help fixing the problem.
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When creating a Blazor Web App you can select from various options, like whether to enable authentication, what interactive render modes to enable, and how much of the app you want to be interactive. For this app, make sure the defaults are selected as follows:
The first time you run a web app in Visual Studio, it will set up a development certificate for hosting the app over HTTPS and then prompt you to trust the certificate. We recommend agreeing to trust the certificate. The certificate will only be used for local development, and without it most browsers will complain about the security of the website.
It already contains the code that sets it as the homepage and displays the text Hello, world! and Welcome to your new app. The PageTitle component sets the title for the current page so that it shows up in the browser tab.
If you receive an error message saying "Your connection is not private" with error code NET::ERR_CERT_INVALID, try to restart all browser windows so the new certificate can be picked up by the browser and run the application again.
A request for /counter in the browser, as specified by the @page directive at the top, causes the Counter component to render its content. The @rendermode directive enables interactive server rendering for the component, so that it can handle user interface events from the browser.
Open the Home.razor file in Visual Studio. The Home.razor file already exists, and it was created when you created the project. It's located in the Components/Pages folder inside the BlazorApp directory that was created earlier.
Open the Home.razor file in a text editor of your choice. The Home.razor file already exists, and it was created when you ran the dotnet new command. It's located in the Components/Pages folder inside the BlazorApp directory that was created earlier.
Component parameters are specified using attributes or child content, which allow you to set properties on the child component. Define a parameter on the Counter component for specifying how much it increments with every button click:
Apply the change to the app by clicking the Hot Reload button. The Home component now has its own counter that increments by ten each time the Click me button is selected, as shown in the following image. The Counter component (Counter.razor) at /counter continues to increment by one.
The Home component now has its own counter that increments by ten each time the Click me button is selected, as shown in the following image. The Counter component (Counter.razor) at /counter continues to increment by one.
The following series of tutorials introduce you to the Windows Communication Foundation (WCF) programming experience. Working through these tutorials in order will give you an introductory understanding of the steps required to create WCF applications. After you finish, you'll have a running WCF service and a WCF client that calls the service.
The first three tutorials describe how to define a WCF service contract, how to implement it, and how to host it. The service that you create is self-hosted within a console application. You can also host services under Microsoft Internet Information Services (IIS). For more information, see How to: Host a WCF Service in IIS. Although you use code to configure the service in the tutorial, you can also configure services within a configuration file.
Configure an endpoint for the service and host the service in a console application. For a service to become active, you must configure it and host it within a run-time environment. This run-time environment creates the service and controls its context and lifetime.
The next two tutorials describe how to create, configure, and use a client application to call the operations the service exposes. Services publish metadata that define the information a client application needs to communicate with the service. Visual Studio automates the process of accessing this metadata and uses it to construct the client application for the service. If you decide not to use Visual Studio, you can use the ServiceModel Metadata Utility tool (Svcutil.exe) instead.
Retrieve metadata for creating a WCF client proxy from a WCF service. You retrieve metadata by using Visual Studio to add a service reference or you can use the ServiceModel Metadata Utility tool. You specify the endpoint that the client uses to access the service.
This information relates to a pre-release product that may be substantially modified before it's commercially released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Minimal APIs are architected to create HTTP APIs with minimal dependencies. They're ideal for microservices and apps that want to include only the minimum files, features, and dependencies in ASP.NET Core.
This tutorial teaches the basics of building a minimal API with ASP.NET Core. Another approach to creating APIs in ASP.NET Core is to use controllers. For help with choosing between minimal APIs and controller-based APIs, see APIs overview. For a tutorial on creating an API project based on controllers that contains more features, see Create a web API.
The Visual Studio Code instructions use the .NET CLI for ASP.NET Core development functions such as project creation. You can follow these instructions on macOS, Linux, or Windows and with any code editor. Minor changes may be required if you use something other than Visual Studio Code.
The preceding code defines the database context, which is the main class that coordinates Entity Framework functionality for a data model. This class derives from the Microsoft.EntityFrameworkCore.DbContext class.
builder.Services.AddEndpointsApiExplorer();: Enables the API Explorer, which is a service that provides metadata about the HTTP API. The API Explorer is used by Swagger to generate the Swagger document.
builder.Services.AddOpenApiDocument(config => {...});: Adds the Swagger OpenAPI document generator to the application services and configures it to provide more information about the API, such as its title and version. For information on providing more robust API details, see Get started with NSwag and ASP.NET Core
The previous code enables the Swagger middleware for serving the generated JSON document and the Swagger UI. Swagger is only enabled in a development environment. Enabling Swagger in a production environment could expose potentially sensitive details about the API's structure and implementation.
ASP.NET Core automatically serializes the object to JSON and writes the JSON into the body of the response message. The response code for this return type is 200 OK, assuming there are no unhandled exceptions. Unhandled exceptions are translated into 5xx errors.
This method is similar to the MapPost method, except it uses HTTP PUT. A successful response returns 204 (No Content). According to the HTTP specification, a PUT request requires the client to send the entire updated entity, not just the changes. To support partial updates, use HTTP PATCH.
This sample uses an in-memory database that must be initialized each time the app is started. There must be an item in the database before you make a PUT call. Call GET to ensure there's an item in the database before making a PUT call.
The sample app code repeats the todoitems URL prefix each time it sets up an endpoint. APIs often have groups of endpoints with a common URL prefix, and the MapGroup method is available to help organize such groups. It reduces repetitive code and allows for customizing entire groups of endpoints with a single call to methods like RequireAuthorization and WithMetadata.
Returning TypedResults rather than Results has several advantages, including testability and automatically returning the response type metadata for OpenAPI to describe the endpoint. For more information, see TypedResults vs Results.
Currently the sample app exposes the entire Todo object. Production apps In production applications, a subset of the model is often used to restrict the data that can be input and returned. There are multiple reasons behind this and security is a major one. The subset of a model is usually referred to as a Data Transfer Object (DTO), input model, or view model. DTO is used in this article.
Minimal APIs are architected to create HTTP APIs with minimal dependencies. They are ideal for microservices and apps that want to include only the minimum files, features, and dependencies in ASP.NET Core.
This tutorial teaches the basics of building a minimal API with ASP.NET Core. Another approach to creating APIs in ASP.NET Core is to use controllers. For help in choosing between minimal APIs and controller-based APIs, see APIs overview. For a tutorial on creating an API project based on controllers that contains more features, see Create a web API. 152ee80cbc
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