In ASP.NET Core Web API, you can return various types of results from action methods. Here is a comprehensive list of return types you can use in ASP.NET Core Web API:
### 1. **ObjectResult:**
- `ObjectResult` allows you to return an object along with an HTTP status code.
```csharp
public IActionResult Get()
{
var data = new { key = "value" };
return Ok(data); // or return new ObjectResult(data);
}
```
### 2. **ActionResult<T>:**
- `ActionResult<T>` is a generic version of `ObjectResult` that allows you to return an object of type `T` along with an HTTP status code.
```csharp
public ActionResult<string> Get()
{
return Ok("value");
}
```
### 3. **IActionResult:**
- `IActionResult` is an interface that represents a result of an action method. It allows you to return various types of action results.
```csharp
public IActionResult Get()
{
if (condition)
{
return Ok();
}
else
{
return NotFound();
}
}
```
### 4. **ViewResult:**
- `ViewResult` is used in MVC controllers to return a view as a result of the action method.
```csharp
public IActionResult Index()
{
return View();
}
```
### 5. **FileResult:**
- `FileResult` is used to return files to the client.
```csharp
public IActionResult DownloadFile()
{
byte[] fileBytes = // Read file content into byte array
string fileName = "example.txt";
return File(fileBytes, "application/octet-stream", fileName);
}
```
### 6. **ContentResult:**
- `ContentResult` allows you to return a string content along with an HTTP status code and content type.
```csharp
public IActionResult Get()
{
return Content("Hello, World!", "text/plain");
}
```
### 7. **JsonResult:**
- `JsonResult` is used to return JSON-formatted data.
```csharp
public IActionResult Get()
{
var data = new { key = "value" };
return Json(data);
}
```
### 8. **NotFoundResult:**
- `NotFoundResult` returns a 404 Not Found status code.
```csharp
public IActionResult Get(int id)
{
if (Exists(id))
{
return Ok();
}
else
{
return NotFound();
}
}
```
### 9. **BadRequestResult:**
- `BadRequestResult` returns a 400 Bad Request status code.
```csharp
public IActionResult Post([FromBody] MyModel model)
{
if (ModelState.IsValid)
{
// Process the model
return Ok();
}
else
{
return BadRequest();
}
}
```
### 10. **RedirectResult:**
- `RedirectResult` is used to perform a redirection to a specified URL.
```csharp
public IActionResult RedirectToExternalUrl()
{
return Redirect("https://www.example.com");
}
```
### 11. **RedirectToActionResult:**
- `RedirectToActionResult` is used to perform a redirection to another action within the same controller.
```csharp
public IActionResult RedirectToIndex()
{
return RedirectToAction("Index");
}
```
### 12. **ChallengeResult:**
- `ChallengeResult` is used to initiate an authentication challenge.
```csharp
public IActionResult Logout()
{
return SignOut("Cookies", "oidc");
}
```
These are some of the common return types you can use in ASP.NET Core Web API actions. You can choose the appropriate return type based on your API's requirements and the specific response you want to send to the client.
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