Asp net core bad model in parameter at post action is not set to null

Introduction

ASP.NET is a popular programming used for building web applications. It provides a framework for developing , web services, and web APIs. One common that developers face is the bad model in parameter at post not being set to null in ASP.NET Core. In this article, we will explore this problem and provide a with examples.

The Problem

When working with ASP.NET Core, it is common to use models to bind data from the client to the server. In some cases, the model may not be set to null when passed as a parameter to a post action. This can lead to unexpected behavior and errors in the application.

The Solution

To solve this issue, we can use the [FromBody] attribute in ASP.NET Core. This attribute tells the framework to bind the model from the request body, ensuring that it is set to null if no data is provided.

Let's take a look at an example:


[HttpPost]
public IActionResult Create([FromBody] MyModel model)
{
    // Perform some  with the model
    // ...
    return Ok();
}

In the above code, we have a post action “Create” that takes a parameter of type “MyModel”. By adding the [FromBody] attribute, we ensure that the model is bound from the request body and set to null if no data is provided.

Now, if we make a POST request to this action without providing any data, the model will be set to null:


POST /api/mycontroller/create HTTP/1.1
-Type: application/json

{}

In the above example, we are making a POST request to the “Create” action with an empty JSON object as the request body. Since no data is provided, the model will be set to null.

However, if we provide data in the request body, the model will be populated with the provided values:


POST /api/mycontroller/create HTTP/1.1
Content-Type: application/json

{
    "name": "John Doe",
    "age": 25
}

In the above example, we are providing data in the request body. The model will be populated with the values “John Doe” for the name property and 25 for the age property.

Conclusion

The bad model in parameter at post action not being set to null in ASP.NET Core can be solved by using the [FromBody] attribute. This ensures that the model is bound from the request body and set to null if no data is provided. By following this , developers can avoid unexpected behavior and errors in their ASP.NET Core applications.

Rate this post

Leave a Reply

Your email address will not be published. Required fields are marked *

Table of Contents