ASP.NET Web API in C#

To call a RESTful service API in C#, you can use the HttpClient class. Here is an example:

using System.Net.Http;
using System.Threading.Tasks;

public static async Task<string> CallRestApi(string url)
{
    using (HttpClient client = new HttpClient())
    {
        HttpResponseMessage response = await client.GetAsync(url);
        response.EnsureSuccessStatusCode();
        string responseBody = await response.Content.ReadAsStringAsync();
        return responseBody;
    }
}

To pass an array of values in ASP.NET Web API, you can use the [FromUri] attribute to bind the values from the query string to an array parameter in your action method. Here is an example:

[HttpGet]
public IHttpActionResult MyActionMethod([FromUri] int[] values)
{
    // do something with the values array
}

To ignore a specific object property during JSON serialization in Web API, you can use the [JsonIgnore] attribute on the property. Here is an example:

public class MyModel
{
    public int Id { get; set; }

    [JsonIgnore]
    public string Secret { get; set; }

    public string Name { get; set; }
}

In this example, the "Secret" property will be ignored during JSON serialization.

C# Web API authentication in ASP.NET:
- Implementing authentication in ASP.NET Web API using C#.
- Code snippet:
```
[Authorize]
public class ValuesController : ApiController
{
    // Controller actions
}
```

ASP.NET Web API routing in C#:

Configuring and understanding routing in ASP.NET Web API using C#.

Code snippet:

config.Routes.MapHttpRoute(
    name: "DefaultApi",
    routeTemplate: "api/{controller}/{id}",
    defaults: new { id = RouteParameter.Optional }
);

Securing ASP.NET Web API endpoints in C#:
- Ensuring security for specific endpoints in ASP.NET Web API using C#.
- Code snippet:
```
[Authorize(Roles = "Admin")]
public IHttpActionResult SecureEndpoint()
{
    // Endpoint logic
}
```

ASP.NET Web API versioning in C#:

Managing API versioning in ASP.NET Web API using C#.

Code snippet:

config.Services.Replace(typeof(IHttpControllerSelector), new VersionedControllerSelector(config));

C# Web API parameter binding:
- Handling parameter binding in ASP.NET Web API using C#.
- Code snippet:
```
public IHttpActionResult Get(int id)
{
    // Retrieve data based on the id parameter
}
```
Working with JSON in ASP.NET Web API:
- Processing JSON data in ASP.NET Web API using C#.
- Code snippet:
```
public IHttpActionResult Post([FromBody] MyModel data)
{
    // Process JSON data
}
```

C# Web API error handling:

Implementing error handling in ASP.NET Web API using C#.

Code snippet:

public IHttpActionResult Get()
{
    try
    {
        // Logic that may throw an exception
    }
    catch (Exception ex)
    {
        return InternalServerError(ex);
    }
}

ASP.NET Web API CORS in C#:
- Enabling Cross-Origin Resource Sharing (CORS) in ASP.NET Web API using C#.
- Code snippet:
```
config.EnableCors(new EnableCorsAttribute("*", "*", "*"));
```
Token-based authentication in ASP.NET Web API:
- Implementing token-based authentication in ASP.NET Web API using C#.
- Code snippet:
```
[Authorize]
public IHttpActionResult SecureEndpoint()
{
    // Access secured endpoint
}
```

C# Web API model validation:

Validating input models in ASP.NET Web API using C#.

Code snippet:

public IHttpActionResult Post([FromBody] MyModel data)
{
    if (!ModelState.IsValid)
    {
        return BadRequest(ModelState);
    }
    // Process valid data
}

Implementing CRUD operations in ASP.NET Web API:

Performing CRUD operations in ASP.NET Web API using C#.

Code snippet:

public IHttpActionResult Get(int id)
{
    // Retrieve data based on the id parameter
}

public IHttpActionResult Post([FromBody] MyModel data)
{
    // Create new data
}

public IHttpActionResult Put(int id, [FromBody] MyModel data)
{
    // Update data based on the id parameter
}

public IHttpActionResult Delete(int id)
{
    // Delete data based on the id parameter
}

Dependency injection in ASP.NET Web API:

Implementing dependency injection in ASP.NET Web API using C#.

Code snippet:

public class ValuesController : ApiController
{
    private readonly IService _service;

    public ValuesController(IService service)
    {
        _service = service;
    }
}

C# Web API custom filters:
- Creating and using custom filters in ASP.NET Web API using C#.
- Code snippet:
```
public class CustomFilterAttribute : ActionFilterAttribute
{
    // Custom filter logic
}
```
Securing ASP.NET Web API with OAuth in C#:
- Securing ASP.NET Web API using OAuth authentication in C#.
- Code snippet:
```
[Authorize]
public IHttpActionResult SecureEndpoint()
{
    // Access secured endpoint
}
```