What is Model Binding?
💡 Concept: Model Binding
Model Binding in ASP.NET Core maps HTTP request data to action method parameters and model properties.
📘 Quick Intro
It automates extracting data from requests (query, form, route) to strongly typed parameters.
🧠 Analogy
Like a waiter taking your order and delivering it exactly to the kitchen station responsible.
🔧 Technical Explanation
- Supports binding from various sources: query string, form data, route data, headers, body.
- Uses parameter names and attributes to match incoming data.
- Supports complex types and collections.
- Custom model binders allow fine-grained control.
- Helps simplify controller code and validation.
🎯 Use Cases
- ✅ Binding form inputs to action method parameters.
- ✅ Mapping query strings to method parameters.
- ✅ Populating complex model objects automatically.
- ✅ Customizing binding behavior with attributes.
💻 Code Example
// Sample action using model binding
public IActionResult SubmitOrder(OrderModel order) {
if (ModelState.IsValid) {
// process order
}
return View();
}
public class OrderModel {
public string ProductName { get; set; }
public int Quantity { get; set; }
}
❓ Interview Q&A
Q1: What is model binding?
A: Process of mapping request data to action parameters.
Q2: What sources can model binding extract data from?
A: Query, form, route, headers, body.
Q3: Can model binding handle complex types?
A: Yes.
Q4: What are custom model binders?
A: Classes to customize binding logic.
Q5: Does model binding validate data?
A: Works with validation attributes.
Q6: Is model binding only for MVC?
A: Mostly MVC and Razor Pages.
Q7: Can you bind from headers?
A: Yes, with attributes.
Q8: What attribute is used to specify binding source?
A: [FromQuery], [FromBody], etc.
Q9: Is model binding automatic?
A: Yes.
Q10: Can you bind to collections?
A: Yes.
📝 MCQs
Q1. What is model binding?
- Mapping request data to action parameters
- Validating data
- Rendering views
- Routing requests
Q2. What sources can model binding extract data from?
- Query only
- Form only
- Query, form, route, headers, body
- Headers only
Q3. Can model binding handle complex types?
- No
- Yes
- Sometimes
- Rarely
Q4. What are custom model binders?
- Validation tools
- Customize binding logic
- Data annotations
- View components
Q5. Does model binding validate data?
- Yes
- No
- Sometimes
- Never
Q6. Is model binding only for MVC?
- Yes
- No
- Only MVC
- All frameworks
Q7. Can you bind from headers?
- No
- Yes
- Sometimes
- Never
Q8. What attribute specifies binding source?
- [FromQuery], [FromBody]
- [FromRoute]
- [FromForm]
- [FromHeader]
Q9. Is model binding automatic?
- No
- Yes
- Sometimes
- Never
Q10. Can you bind to collections?
- No
- Yes
- Sometimes
- Never
💡 Bonus Insight
Model binding simplifies handling incoming data and reduces boilerplate code in ASP.NET Core applications.
📄 PDF Download
Need a handy summary for your notes? Download this topic as a PDF!