// finds a stock request by ID
public static StockRequest Find(int id)
{
try
{
if (id <= 0)
{
throw new ArgumentException("ID must be greater than 0");
}
List <StockRequest> storerequests = StockRequest.All();
StockRequest res = (from req in storerequests
where req.Id == id
select req).First();
if (res != null)
{
return(res);
}
}
catch (Exception e)
{
Console.WriteLine(e.Message);
return(null);
}
return(null);
}
// Deletes an exiting request.
// Since this is an instance method, it is best that you'll use
// StockRequest.find() to get the instance of request you want to delete
public bool Delete()
{
string path = Path.Combine(PathHelper.BASEPATH, @"Resources/stockrequests.txt");
try
{
if (Id == 0)
{
throw new Exception("Request ID is required");
}
if (StoreName == null)
{
throw new Exception("Store name is required");
}
if (ProductName == null)
{
throw new Exception("Product name is required");
}
if (StockRequest.Find(Id) == null)
{
throw new Exception("This request cannot be found");
}
List <StockRequest> items = StockRequest.All();
var itemtoremove = items.Single(item => item.Id == Id);
items.Remove(itemtoremove);
string json = JsonConvert.SerializeObject(items, Formatting.Indented);
File.WriteAllText(path, json);
return(true);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
return(false);
}
}
// Saves a stock request. This may add or edit exiting requests.
// Since this is an instance method, it is best that you'll use
// StockRequest.find() to get the instance of request you want to edit
public bool Save()
{
// saving operation may fail
try
{
if (StoreName == null)
{
throw new Exception("Store name is required");
}
if (ProductName == null)
{
throw new Exception("Product name is required");
}
if (Quantity < 0)
{
throw new Exception("Quantity is required");
}
List <StockRequest> stockRequests = StockRequest.All();
// autogenerate ID for new requests
int useID = 1;
if (stockRequests.Count() > 0)
{
// ID must be unique
if (Id != 0)
{
int matches = (from sr in stockRequests
where sr.Id == Id
select sr).Count();
if (matches > 0)
{
throw new Exception("Item with similar ID already exists");
}
}
// ID of new item is the ID of latest item plus 1;
var latestItem = (from sr in stockRequests
orderby sr.Id descending
select sr).First();
useID = latestItem.Id + 1;
}
// stock requests can ONLY be added, not modified
StockRequest stockRequest = new StockRequest();
stockRequest.Id = useID;
stockRequest.StoreName = StoreName;
stockRequest.ProductName = ProductName;
stockRequest.Quantity = Quantity;
stockRequests.Add(stockRequest);
// insert into file
string path = Path.Combine(PathHelper.BASEPATH, @"Resources/stockrequests.txt");
string json = JsonConvert.SerializeObject(stockRequests, Formatting.Indented);
File.WriteAllText(path, json);
return(true);
}
// if anything goes wrong, return false
catch (Exception e)
{
Console.WriteLine(e.Message);
return(false);
}
}