There are four main types of Web API interface return values: void, IHttpActionResult, HttpResponseMessage, and custom types. Each has its own use case and behavior.
Void is used when a method does not need to return any value. For example, in an API controller, you might define a method like this:
```csharp
public void Get()
{
// No return value
}
```
When using Postman to test such an endpoint, you'll see that the HTTP status code returned is 204, indicating "No Content." This means the server processed the request but has no data to return.
IHttpActionResult is one of the most commonly used return types in Web API. It allows you to return various types of responses, such as `Json(T content)`, `Ok()`, `NotFound()`, `BadRequest()`, and more. These methods provide a clean way to handle different HTTP responses.
For instance, the `Json(T content)` method is often used to return JSON-formatted data. Under the hood, it returns a `JsonResult` object, which implements the `IHttpActionResult` interface. This gives you flexibility in how you structure your responses.
You can also return dynamic objects or custom types, allowing for more complex and flexible response structures. Here's an example of returning a dynamic object:
```csharp
public IHttpActionResult Get()
{
var data = new { Name = "John", Age = 30 };
return Json(data);
}
```
In addition to these, `HttpResponseMessage` provides even more control over the HTTP response, including headers, status codes, and content. It’s particularly useful when you need to build a response manually or handle more advanced scenarios.
Understanding these return types helps you choose the right approach based on your application's needs, ensuring efficient and clear communication between the client and the server.
Mini LED Screen,Mini Led Screen Display,Mini Indoor LED Video Wall,COB Mini LED Video Wall
Shanghai Really Technology Co.,Ltd , https://www.really-led.com