在ASP.NET MVC中导出具有多个表的Crystal Reports

Question

I am trying to print an orders report from my web application. I have to connect 3 tables to get the data that I want.

For instance, I have an Orders , Contract and Products table. I also have another table ContractProducts which is the bridge table for contract and products. The orders table has a customer id as a foreign key and the contract table has a foreign key as well for the customer id.

I actually have a Customers table as well but I decided to just use the customer id from the orders table because I have no use for the Customers table. Long story short, I need to display the Order ID, Contract ID and the products associated with the order. I have the following code and it is giving me an error saying that there is an error in retrieving the database. I used the join method however, it is still not working. Please help me. I've spent hours on this :(

//This function is for Export order report

public ActionResult CreateOrderReport()
    {
        try
        {              

            var orders = (from o in db.Orders
                     join con in db.Contracts on o.CustomerID equals con.CustomerID
                     join prod in db.ContractProducts on con.ContractID equals prod.ContractID
                     select new
                     {
                         OrderID = o.OrderID.ToString(),
                         CustomerID = o.Customer.CustomerID.ToString(),
                         CustomerName = o.Customer.CustomerName.ToString(),
                         Phone = o.Customer.Phone.ToString(),
                         ProductID = prod.ProductID.ToString(),
                         CategoryID = prod.Product.CategoryID.ToString(),
                         Brand = prod.Product.Brand.ToString(),
                         Volume = prod.Product.Volume.ToString(),
                         PackSize = prod.Product.PackSize.ToString(),
                         Quantity = prod.Quantity.ToString()
                     }).ToList();


            ReportDocument Rep = new ReportDocument();

            Rep.Load(Path.Combine(Server.MapPath("~/Reports/OrderReport.rpt")));

            Rep.SetDataSource(orders);
            Response.Buffer = false;
            Response.ClearContent();
            Response.ClearHeaders();

            Stream stream = Rep.ExportToStream(CrystalDecisions.Shared.ExportFormatType.PortableDocFormat);
            stream.Seek(0, SeekOrigin.Begin);
            return File(stream, "application/pdf", "Orders Report.pdf");
        }
        catch (DataException ex)
        {
            throw;
        }

    }

Answer 1

***Replace this part***

********************************************************************

    var orders = (from o in db.Orders
    join con in db.Contracts on o.CustomerID equals con.CustomerID
    join prod in db.ContractProducts on con.ContractID equals prod.ContractID
    select new
    {
     OrderID = o.OrderID.ToString(),
     CustomerID = o.Customer.CustomerID.ToString(),
     CustomerName = o.Customer.CustomerName.ToString(),
    Phone = o.Customer.Phone.ToString(),
     ProductID = prod.ProductID.ToString(),
     CategoryID = prod.Product.CategoryID.ToString(),
     Brand = prod.Product.Brand.ToString(),
     Volume = prod.Product.Volume.ToString(),
     PackSize = prod.Product.PackSize.ToString(),
     Quantity = prod.Quantity.ToString()
    }).ToList();

********************************************************************
***with this***
********************************************************************
db.Orders.Select(p => new
{
    OrderID = o.OrderID.ToString(),
     CustomerID = o.Customer.CustomerID.ToString(),
     CustomerName = o.Customer.CustomerName.ToString(),
     Phone = o.Customer.Phone.ToString(),
     ProductID = prod.ProductID.ToString(),
     CategoryID = prod.Product.CategoryID.ToString(),
     Brand = prod.Product.Brand.ToString(),
     Volume = prod.Product.Volume.ToString(),
     PackSize = prod.Product.PackSize.ToString(),
     Quantity = prod.Quantity.ToString()
}).ToList());
********************************************************************
***and create Dataset with DataTable name is **

> Orderexport

** have this column :***

    OrderID 
    CustomerID 
    CustomerName 
    Phone 
    ProductID 
    CategoryID 
    Brand
    Volume 
    PackSize 
    Quantity


***And change the database source of your Crystal Reports "OrderReport.rpt"***


***

> It works well

***