Patch in web api

Hello Latha,

Put Request

PUT request method is commonly used to update an existing resource.

When a client sends a PUT request to the server, it includes the entire representation of the updated resource in the request body. The server then replaces the old representation of the resource with the new representation in its storage.

[HttpPut("{id}")]
public ActionResult Update(int id, User user)
{
	var existingUser = _users.Find(u => u.Id == id);

	if (existingUser == null)
	{
		return NotFound();
	}

	await _repo.UpdateAsync(id, user)
	

	return Ok();
}

It will update all the fields of user.

Patch request

A patch request in a web API is a type of HTTP request that is used to update a resource with only the changes that need to be made, instead of replacing the entire resource. This is useful in cases where you only want to modify certain properties of a resource, without having to send the entire object back to the server.

Sample Example :

[HttpPatch("{id}")]
public ActionResult PartialUpdate(int id, User user)
{
	var existingUser = _users.Find(u => u.Id == id);

	if (existingUser == null)
	{
		return NotFound();
	}

	existingUser.Name = user.Name ?? existingUser.Name;
	existingUser.Email = user.Email ?? existingUser.Email;
	
	await _repo.UpdateAsync(id, user)
	

	return Ok();
}

Assume use have send request with Name and Email and it will update the name and email into user.

A PUT request is used to completely replace an existing resource with a new version of that resource. The entire resource is sent in the request body and replaces the previous version of the resource. This means that a PUT request updates the entire resource and any fields that are not included in the request will be set to their default values.

On the other hand, a PATCH request is used to make a partial update to an existing resource. In a PATCH request, the request body contains only the changes to the resource that need to be made, rather than the entire resource. This means that a PATCH request updates only the specified fields and leaves the rest of the resource unchanged.

You can refere below article. 

https://code-maze.com/using-httpclient-to-send-http-patch-requests-in-asp-net-core/

Thanks

Naimish Makwana