Day 8 C Sharp Put & Delete Database Data

After Get and Post method, we will learn the last two method, they are Put and Delete method.

Put method

Open CustomerController.cs.

`CustomerController.cs`.
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.
.
[HttpPut]
public async Task<ActionResult<Customer>> PutCustomer(int id, Customer customer)
{
    if (id != customer.Id)
    {
        return BadRequest();
    }

    _context.Entry(customer).State = EntityState.Modified;

    try
    {
        await _context.SaveChangesAsync();
    }
    catch (DbUpdateConcurrencyException) 
    {
        if (!CustomerExists(id)) { return NotFound(); }
        else { throw; }
    }

    return NoContent();
}

private bool CustomerExists(int id)
{
    return (_context.Customers?.Any(customer => customer.Id == id)).GetValueOrDefault();
}

Open Postman.

Put method means to edit the data, it required am id from the request URL and the data from request body. According to the HTTP specification, a PUT request the client to submit the complete updated entity, which is mandatory, but not only the data to be modified.

The response for this is 204 (No Content).

Delete method

Open CustomerController.cs.

`CustomerController.cs`.
.
.
.
[HttpDelete("{id}")]
public async Task<ActionResult<Customer>> DeleteCustomer(int id)
{
    if(_context.Customers == null)
    {
        return NotFound();
    }
    var customer = await _context.Customers.FindAsync(id);
    if (customer == null) 
    {
        return NotFound();
    }
    _context.Customers.Remove(customer);
    await _context.SaveChangesAsync();
    return NoContent();
}

Open Postman.