// GET: api/CustomersApi
public IHttpActionResult Get()
{
// Attention 01 (web service) - Error - object reference not set to an instance of an object
// Just as it says... an object is null, and you're trying to use it
// Set a breakpoint near this line, then "step over" to get to the error
// Inspect the variable values as you step through the lines of code
// Create a new CustomerEditContactInfo object
// Intentionally leave out some property values
// To fix, simply un-comment out the Fax and Email lines of code below
var newCust = new CustomerEditContactInfo
{
//Fax = "(416) 661-4034",
//Email = "*****@*****.**",
CustomerId = 2,
Phone = "(416) 491-5050"
};
// Now, attempt to use (call, reference) some values that are not set
// To fix, un-comment the Fax and Email lines of code above
var email = newCust.Email;
var emailLength = email.Length;
// End of error block; the remaining code will work as expected
// Fetch the collection
var c = m.CustomerGetAll();
// Pass the collection to the view
return(Ok(c));
}
/*
* // GET: api/CustomersApi/5
* public string Get(int id)
* {
* return "value";
* }
*
* // POST: api/CustomersApi
* public void Post([FromBody]string value)
* {
* }
*/
// PUT: api/CustomersApi/5
public IHttpActionResult Put(int id, [FromBody] CustomerEditContactInfo editedItem)
{
// Ensure that an "editedItem" is in the entity body
if (editedItem == null)
{
return(BadRequest("Must send an entity body with the request"));
}
// Ensure that the id value in the URI matches the id value in the entity body
if (id != editedItem.CustomerId)
{
return(BadRequest("Invalid data in the entity body"));
}
// Ensure that we can use the incoming data
if (ModelState.IsValid)
{
// Attention 03 (web service) - Error - cause a validation error when saving to the store
// At this point in the method, newItem has passed the initial validation test
// Set a breakpoint near this line
// So, let's invalidate some of its values (null and string too long),
// and pass it to the manager, which will attempt to save it to the data store
// Then, BOOM!, a DbEntity validation error will appear
// Set a required value to null
// To fix this, comment out the following line
editedItem.Email = null;
// Set another to a too-long value
// To fix this, comment out the following line
editedItem.Phone = "This string is too long. It exceeds the 24-character limit.";
// Attempt to do the update
var changedItem = m.CustomerEditContactInfo(editedItem);
if (changedItem == null)
{
// Return HTTP 400
return(BadRequest("Cannot edit the object"));
}
else
{
// Return HTTP 200 with the changed item in the entity body
return(Ok <CustomerBase>(changedItem));
}
}
else
{
return(BadRequest(ModelState));
}
}