What are some examples of model binding in ASP.NET Core?

What are some examples of model binding in ASP.NET Core?

Model binding in ASP.NET Core is a process that converts data from HTTP requests into .NET objects. Here are a few examples:

1. Simple Types: If you have a form with a text input named 'name', you can bind it directly to a string property in your model.

2. Complex Types: You can bind a JSON object from the request body to a complex type. For instance, if you send a JSON object representing a user, it can be bound to a User model.

3. Collections: You can bind collections from query strings or form data. For example, if you have multiple checkboxes for interests, they can be bound to a list of strings.

4. Custom Model Binders: You can create your own model binders for specific scenarios, like binding a custom type from a specific format.

Would you like to see code examples for any of these?

Yes, can you show me a code example for binding a complex type?

Sure! Here's a simple example of binding a complex type in ASP.NET Core:

public class User
{
    public string Name { get; set; }
    public int Age { get; set; }
}

[HttpPost]
public IActionResult CreateUser([FromBody] User user)
{
    if (ModelState.IsValid)
    {
        // Process the user object
        return Ok(user);
    }
    return BadRequest(ModelState);
}

In this example, when you send a JSON object like { "name": "John", "age": 30 } in the request body, it will be automatically bound to the User model. Would you like to know more about any specific part?

That's great! What about binding collections?

For binding collections, you can use a similar approach. Here's an example:

public class InterestsModel
{
    public List<string> Interests { get; set; }
}

[HttpPost]
public IActionResult SubmitInterests([FromBody] InterestsModel model)
{
    if (ModelState.IsValid)
    {
        // Process the list of interests
        return Ok(model.Interests);
    }
    return BadRequest(ModelState);
}

In this case, if you send a JSON object like { "interests": ["Reading", "Traveling", "Gaming"] }, it will bind the interests to the Interests property of the InterestsModel. Would you like to explore more examples?