I have two tables Products and Order for some reason I just want a few records to come and sit in Orders table
I have the following code
public ActionResult Order()
{
List<Product> products=TempData["products"] as List<Product>;
List<Order> orders = new List<Order>();
Order order = new Order();
foreach (var item in products)
{
order.Customer_Id = 1;
order.Product_Name = item.Model_Name;
order.Amount = item.Price;
order.Order_Date = DateTime.Now.ToLocalTime();
orders.Add(order);
}
db.Orders.InsertAllOnSubmit(orders);
db.SaveChanges();
return View(products);
}
I just want to know how does it work found some stuff online but couldn't understand how really it works. Can anyone could tell how it works nad how to apply it in the above code
I have no idea why it doesn't compile, according to the discussion under your question you possibly paste some other code, however this should definitely work:
public ActionResult Order()
{
List<Product> products=TempData["products"] as List<Product>;
foreach (var item in products)
{
Order order = new Order();
order.Customer_Id = 1;
order.Product_Name = item.Model_Name;
order.Amount = item.Price;
order.Order_Date = DateTime.Now.ToLocalTime();
db.Orders.Add(order);
}
db.SaveChanges();
return View(products);
}
Edit: note that since you are calling SaveChanges rather than SubmitChanges Then most probably you are not using linq2sql but rather, the Entity Framework and you are just confusing these two!
The InsertAllOnSubmit is not implemented in EF, you just use the code I suggest above.
Related
I have the following code
here is how I add a list of values to session
public ActionResult Add(Product product)
{
if (Session["AddToCart"] == null)
{
Session["AddToCart"] = new List<Product>();
}
var list = (List<Product>)Session["AddToCart"];
list.Add(product);
}
but how to remove a single record when a session contains multiple records. I am trying to pass an Id but it is not removing the record from the session. Here is how I perform the next step.
Public ActionResult Remove(Product product)
{
Product prod=db.Products.Single(x=>x.Id==product.Id);
var list=(List<Product>)Session["AddToCart"];
//Is this the correct approach
list.Remove(prod);
}
The above code doesn't works. Am I correct or is there anything missing plz correct the above code. Thanks.
Try this,
var list=(List<Product>)Session["AddToCart"];
list.RemoveAll(p => p.Id == product.Id);
Your choice of finding the product with the code db.Products.Single(x=>x.Id==product.Id); may not be the same object with the one in the session.
Edit:
Or you can implement IEquatable<Product> interface. In this case your code would work too.
public class Product : IEquatable<Product>
{
public int Id;
public bool Equals(Product prod)
{
return prod.Id == Id;
}
// Rest of the class
}
I have a manually invoked process which is tied to the account entity. This process has a number of steps. One of the first steps is to create a task and assign it to someone. It's expected that this person will add some notes and complete the task.
Further down the process, I have a step to create a service case. After this is created, I want to copy the note(s) from the task above to the newly created service case.
I have created a custom workflow activity to try and accomplish this. I have gotten as far as deploying it and using it within my process without any errors and it does copy content into the notes field of the service case, however it copies the title of the task, not the note content and I can't quite fathom out why.
public class CopyNotes : CodeActivity
{
protected override void Execute(CodeActivityContext executionContext)
{
//Create the context
IWorkflowContext context = executionContext.GetExtension<IWorkflowContext>();
IOrganizationServiceFactory serviceFactory = executionContext.GetExtension<IOrganizationServiceFactory>();
IOrganizationService service = serviceFactory.CreateOrganizationService(context.UserId);
//get the notes associated with the source entity
Guid copyFromId = CopyFrom.Get(executionContext).Id;
Guid copyToId = CopyTo.Get(executionContext).Id;
EntityCollection copyFromNotes = RetrieveNotes(service, copyFromId);
if (copyFromNotes.Entities.Any())
{
foreach (Entity e in copyFromNotes.Entities)
{
Entity newNote = new Entity("annotation");
newNote.Attributes["subject"] = e.Attributes["subject"];
newNote.Attributes["notetext"] = e.Attributes["notetext"];
newNote.Attributes["objectid"] = new EntityReference() { Id = copyToId, LogicalName = CopyTo.Get(executionContext).LogicalName };
}
}
}
private EntityCollection RetrieveNotes(IOrganizationService service, Guid relatedObject)
{
ConditionExpression condition = new ConditionExpression();
condition.AttributeName = "objectid";
condition.Operator = ConditionOperator.Equal;
condition.Values.Add(relatedObject.ToString());
ColumnSet columns = new ColumnSet("subject", "notetext");
QueryExpression query = new QueryExpression();
query.ColumnSet = columns;
query.EntityName = "annotation";
query.Criteria.AddCondition(condition);
EntityCollection results = service.RetrieveMultiple(query);
return results;
}
[RequiredArgument]
[ReferenceTarget("task")]
[Input("Copy notes from item")]
public InArgument<EntityReference> CopyFrom { get; set; }
[RequiredArgument]
[ReferenceTarget("incident")]
[Input("Copy notes to item")]
public InArgument<EntityReference> CopyTo { get; set; }
}
I think you need to actually create the newNote after defining it.
foreach (Entity e in copyFromNotes.Entities)
{
Entity newNote = new Entity("annotation");
newNote.Attributes["subject"] = e.Attributes["subject"];
newNote.Attributes["notetext"] = e.Attributes["notetext"];
newNote.Attributes["objectid"] = new EntityReference() { Id = copyToId, LogicalName = CopyTo.Get(executionContext).LogicalName };
service.Create(newNote);
}
Once I did that your code worked just fine creating a new note with both the title and note text.
You could do this with a standard workflow, if Async creation is fast enough.
Andreas
I'm taking a basic course in C# programming, have never programmed anything before. One of our exercises is to create a program that can rent out movies (i.e. a Videostore) from scratch.
One of my classes contains customers. I need a method where the user of the program can add customers to the first list and a separate method in which to display all customers, containing the newly added customers; or if no customers are added then the original ones.
This is what I´ve done so far:
I've created a List<T> for the original customers.
I have made a method that can add customers to the first list and display them in ONE method.
The problem is that I don´t know how to update the original list of customers with the ones the user adds. If I call the entire method it will obviously (even to me..) return the entire method and make the user add the customers over again. I´ve tried creating two List<T>s, but how can I make the original list update to include the customers the user adds?? I managed to call the first list from the second but the reverse doesn't work.
I have tried and tried and tried but I´ve simply run out of ideas! For me even getting this far has been quite the challenge. I thought about giving the whole thing up. Programming is not easy.
If anyone has any suggestions I would be very happy!
namespace MyNameSpace
{
public class Customers
{
public Customers()
{
}
public string Name
{
get;
set;
}
public string Tel
{
get;
set;
}
public List<Customers> CustomerList1() //Original customers
{
List<Customers> newCustomer = new List<Customers>
{
new Customers
{
Name="A",
Tel="1"
},
new Customers
{
Name="H",
Tel="2"
},
};
return newCustomer;
}
public List<Customers> CustomerList2() //User adds new customers
{
List<Customers> custList = CustomerList1();
Console.WriteLine("---------------------------");
Console.WriteLine("New Customer");
Console.WriteLine("---------------------------");
Console.WriteLine("Name:");
Console.WriteLine("Tel:");
List<Customers> addedCustomer = new List<Customers>
{
new Customers //There is most likely a better way...
{
Name=Console.ReadLine(),
Telephone=Console.ReadLine()
}
};
custList.AddRange(addedCustomer);
Console.WriteLine("***************List******************");
foreach (Customers c in custList)
{
Console.WriteLine();
Console.WriteLine(c.Name);
Console.WriteLine(c.Tel);
Console.WriteLine();
}
Console.WriteLine("******************************************");
return addedCustomer;
}
public void CustomerView() //This method only returns original list
{
List<Customers> customers = CustomerList1();
foreach (Customers c in customers)
{
Console.WriteLine();
Console.WriteLine(c.Name);
Console.WriteLine(c.Tel);
Console.WriteLine();
}
Console.WriteLine("*******************");
}
public void CustomerListAdd() //This is another method I´ve tried to add
{ customers..
List<Customers> customers = CustomerList1();
Console.WriteLine("");
Console.WriteLine("---------------------------");
Console.WriteLine("New Customer");
Console.WriteLine("---------------------------");
Customers customerAdd = new Customers();
Console.WriteLine("Name:");
customerAdd.Name = Console.ReadLine();
Console.WriteLine("Tel:");
customerAdd.Telephone = Console.ReadLine();
customers.Add(customerAdd);
Console.WriteLine();
foreach (Customers c in customers)
{
Console.WriteLine();
Console.WriteLine(c.Name);
Console.WriteLine(c.Tel);
Console.WriteLine();
}
Console.WriteLine("*******************");
}
}
}
Thank you in advance
Make your Customer list class level:
public class MyClass
{
// this is outside of a method, but inside the class
private List<Customer> customers;
public MyClass()
{
// instantiate the customer list inside the constructor
customers = new List<Customer>();
// add a default customer to the list by calling the AddCustomer
// method in the constructor.
AddCustomer(new Customer() { Name = "A", Tel="1" });
// You can also bypass the AddCustomer method below and just call
// customers.Add() here instead. If you have other things you want
// to do (like insert the customer into a database, for example)
// you might want to keep the method like I have below.
}
public void AddCustomer(Customer cust)
{
// add the customer to the existing list.
customers.Add(cust);
}
}
I have been fighting with this all day and still I am failing.
I can simplify the problem as follows:
I have reports and reports have forms. I have entity models of each. They have Guid id's as shown below.
I am trying to get a single view where I can create a report and a form. As an end goal I would like to be able to add multiple forms, but just one would be great. My controller is as follows:
// GET: /AllInOne/Create
public ActionResult Create()
{
ViewBag.PossibleReportBases = reportBaseRepository.All;
ViewBag.PossibleCategories = categoryRepository.All;
var model = new Report {FromDate = DateTime.Now};
model.Forms.Add(new Form());
return View(model);
}
// POST: /AllInOne/Create
[HttpPost]
public ActionResult Create(Report report)
{
if (ModelState.IsValid) {
reportRepository.InsertOrUpdate(report);
reportRepository.Save();
return RedirectToAction("Index");
}
else
{
ViewBag.PossibleReportBases = reportBaseRepository.All;
ViewBag.PossibleCategories = categoryRepository.All;
return View();
}
}
The repository code looks like this:
public void InsertOrUpdate(Report report)
{
if (report.Id == default(System.Guid)) {
// New entity
report.Id = Guid.NewGuid();
context.Reports.AddObject(report);
} else {
// Existing entity
context.Reports.Attach(report);
context.ObjectStateManager.ChangeObjectState(report, EntityState.Modified);
}
}
At one stage the binding was giving me this error:
The EntityCollection has already been initialized. The InitializeRelatedCollection method should only be called to initialize a new EntityCollection during deserialization of an object graph.
I have tried many things for the views, but none of them have worked.
Please help.
i dont' think you need to bother with the attaching. if you've selected the report from your context, it is already being tracked. you can simplify your repository like so
public void InsertOrUpdate(Report report)
{
// i prefer Guid.Empty but no big deal
if (report.Id == default(System.Guid)) {
// New entity
report.Id = Guid.NewGuid();
context.Reports.AddObject(report);
}
context.SaveChanges();
}
I was hoping there was an easier way to do this in my MVC 3 project. In my database, I have a Customer table that is mapped in my application via LINQ2SQL. There is also a partial customer class where I perform updates, look-up etc - which where I have an update method like this:
public static void Update(Customer customer)
{
if (customer == null)
return;
using(var db = new DataBaseContext)
{
var newCustomer = db.Customers.Where(c => c.customer_id = customer.customer_id).SingleOrDefault();
if(newCustomer == null)
return;
newCustomer.first_nm = customer.first_nm;
// ...
// ... Lot's of fields to update
// ...
newCustomer.phone_num = customer.phone_nm;
db.SubmitChanges();
}
}
What I was hoping to find was a less-cumbersome method to update the fields in newCustomer with the corresponding fields in customer that are different.
Any suggestions? Thanks.
I think you can implement IEqualityComparer:
public class Customer
{
public string first_nm { get; set; }
public int phone_num { get; set; }
}
class CustomerComparer : IEqualityComparer<Customer>
{
public bool Equals(Customer x, Customer y)
{
//Check whether the compared objects reference the same data.
if (Object.ReferenceEquals(x, y)) return true;
//Check whether any of the compared objects is null.
if (Object.ReferenceEquals(x, null) || Object.ReferenceEquals(y, null))
return false;
//Check whether the customer' properties are equal.
return x.first_nm == y.first_nm && x.phone_num == y.phone_num ;
}
}
and do it as follows:
if (newCustomer != customer)
{
myDbContext.Customers.Attach(customer,true); // true means modified.
}
Or implement ICloneable and set newCustomer to customer.Clone(). then there's no need to attach customer since newCustomer is already attached.
in EF(4.1), I think You just have to attach the entity as modified:
myDbContext.Customers.AttachAsModified(customer, this.ChangeSet.GetOriginal(customer), myContext);
UPDATE:
Well, it seems like L2S needs original values of the entity. In reply to your comment, you have a couple choices: Using a timestamp column, returning a subset of entities, or having the original entity in your hand. In your scenario, you have the original entity already:
// This is your original entity
var newCustomer = db.Customers.Where(c => c.customer_id = customer.customer_id).SingleOrDefault();
So you will most probably can do:
if (customer != newCustomer)
{
myDbContext.Customers.Attach(customer, newCustomer);
}
Note: I'd rename newCustomer to originalCustomer if I were you since it's more related to the entity's state.
The problem with this approach is that you have an extra trip to database to get your original customer (newCustomer in your code). Take a look at here, here and definitely here to see how you can use TimeStamp columns to prevent the extra database trip.