Figure 710: Display of LINQ Assembled Data in VS .NET

Drawer Code 128 in VS .NET Figure 710: Display of LINQ Assembled Data
Figure 710: Display of LINQ Assembled Data
USS Code 128 Printer In Visual Studio .NET
Using Barcode maker for .NET framework Control to generate, create Code 128 image in Visual Studio .NET applications.
72 The Sample Application
Code-128 Reader In Visual Studio .NET
Using Barcode reader for .NET framework Control to read, scan read, scan image in VS .NET applications.
As before, had we wanted to sort on a property of the newly created anonymous objects, such as the Id or Text property, our sort would need to occur after the anonymous objects were constructed, and the code would have resembled the code shown in Listing 714
Paint Bar Code In Visual Studio .NET
Using Barcode encoder for Visual Studio .NET Control to generate, create bar code image in .NET framework applications.
Listing 714: Sorting on Anonymous Objects
Decode Barcode In .NET
Using Barcode decoder for .NET framework Control to read, scan read, scan image in .NET applications.
cbxOrdersDataSource = (ProgramappDataEmployees[testEmployeeID]Orders Where(order => (DataOrderEntryIsActive(orderobjectState))) Select(sorted => new { Id = sortedOrderID, Text = sortedparentCustomerCustomerID + " - " + sortedNetValueToString("c") PadRight(9)Substring(0, 9) + " - " + sortedOrderDateToString("dd-MMM-yy") }) OrderBy(item => itemText)) ToList();
Encode Code 128 Code Set B In C#
Using Barcode drawer for VS .NET Control to generate, create USS Code 128 image in VS .NET applications.
It is interesting to note that the source collection for the LINQ queries shown in Listings 713 and 714, the Employee object s Orders property, is itself a LINQ expression In that regard, it is similar to the Order object s Details property shown in Listing 712 Thus, the code shown in Listing 714 is an example of a LINQ expression whose complete definition is divided between two separate C# statements Even the code used to submit changes back to the remote database benefits from LINQ, if only slightly For example, the code that loops through all the orders looking for deleted ones and then sets a parameter value and submits the execute delete stored procedure command, goes from
USS Code 128 Generator In .NET
Using Barcode creation for ASP.NET Control to generate, create USS Code 128 image in ASP.NET applications.
foreach (Order order in contextOrdersValues) { if (orderobjectState == ObjectStateDeleted) { cmndParametersAddWithValue("@OrderID", orderOrderID); cmndExecuteNonQuery(); } }
Print Code 128C In Visual Basic .NET
Using Barcode generation for Visual Studio .NET Control to generate, create Code-128 image in .NET applications.
LINQ
Barcode Printer In VS .NET
Using Barcode maker for .NET Control to generate, create bar code image in .NET framework applications.
foreach (Order order in contextOrdersValues Where(order => orderobjectState == ObjectStateDeleted)) { cmndParametersAddWithValue("@OrderID", orderOrderID); cmndExecuteNonQuery(); }
Bar Code Maker In .NET
Using Barcode generation for .NET Control to generate, create bar code image in VS .NET applications.
This code is the last LINQ code in this version of our application Throughout this section, we used LINQ to Objects to access collections of objects; filtering, sorting, aggregating, converting, and performing other operations, all within a single statement occasionally a rather long statement but always a single statement As we wrote these statements, we receivedIntelliSensehelp,allowingustoselectouroperations,seetheavailable properties, and invoke NET methods or our own methods as we went In all, we used LINQ to define properties, bind data, transform objects in preparation for XML serialization, and locate unsynchronized data Business objects made our application more functional, modular, and representative of the business; and although LINQ to Objects made much of that code easier to write, we still needed to write significantly more code in the LINQ to Objects version than we did in the LINQ to Datasets version, especially in the area of change tracking and data synchronization What makes the writing of this additional code even more disconcerting is the fact that we know this code has already been written by others Whoever designed and authored the SystemData, and related namespace, classes wrote change tracking and data synchronization logic, for we can see it in the DataRow and DataAdapter classes Whoever wrote the DataContext class for LINQ to SQL on the desktop wrote change tracking and data synchronization logic We would like to avoid reinventing the wheel and instead have an application that provides the benefits of business objects with already proven change tracking and data synchronization capability, thus producing the most functional application while writing the smallest amount of code And that leads us to the hybrid version
Making Data Matrix 2d Barcode In .NET Framework
Using Barcode drawer for .NET framework Control to generate, create Data Matrix 2d barcode image in Visual Studio .NET applications.
724 The Hybrid Version We begin with the realization that each of our business objects was created from a row in the database and that each object s data consisted of individual
Generate Code 128 In .NET Framework
Using Barcode creator for Visual Studio .NET Control to generate, create Code 128 image in Visual Studio .NET applications.
72 The Sample Application
Making USPS Confirm Service Barcode In .NET Framework
Using Barcode creation for Visual Studio .NET Control to generate, create Planet image in .NET applications.
fields that were exposed as properties Why, then, not load the data into a data set and use the column values of the rows as the backing fields for the object s read-write properties In this scenario, each object would contain the reference to its corresponding data row and nothing more To put it another way, the object would be, in effect, data-bound to the data row Any value assigned to a property of the object would be stored in the matching field of the data row, from whence it would be retrieved whenever the property value was accessed No data would be duplicated, as the business objects would be holding a reference to the data row, not a copy of data And the data rows would provide change tracking on behalf of the objects In addition, the application s data could be written to a file by serializing the data set rather than the application s data object The application s data object, containing its collections of customers, orders, and so on, would still be needed, for we want the benefit of an object s read-only properties, such as OrderDetails and OrderparentCustomer, and the data validation benefit that comes with the read-write properties But this new application data object would no longer need to be serializable Having an application data object that does not need to be serialized provides greater design flexibility and requires less code In this scenario, our business objects would provide data binding for the UI and the source of all business logic The data set would provide serialization of application data, change tracking, and the uploading of data changes back to the remote data source, thus achieving our original application goals, shown in the following list, while requiring the least amount of programming on our part 1 2 3 4 Retrieve all of the employee s orders from the host SQL Server Add, delete, and modify orders Save/restore all application data to a local file Upload all entered information to the host SQL Server
Data Matrix Maker In Visual Basic .NET
Using Barcode creator for VS .NET Control to generate, create Data Matrix ECC200 image in Visual Studio .NET applications.
Figure 711 shows the updated schematic diagram, representing this hybrid version of our application So, let us now examine the code reductions in this hybrid version of our application The data would be read into a data set, saved to a file, and returned to the source database, using the same code that was in the LINQ to Datasets version The definition of the business objects and the application data object remains mostly the same The constructors of the business
Print UPC-A Supplement 2 In .NET
Using Barcode encoder for ASP.NET Control to generate, create UPC-A Supplement 2 image in ASP.NET applications.
Barcode Generation In Visual Studio .NET
Using Barcode encoder for ASP.NET Control to generate, create barcode image in ASP.NET applications.
Barcode Creation In Java
Using Barcode encoder for Java Control to generate, create barcode image in Java applications.
Barcode Maker In Java
Using Barcode drawer for Java Control to generate, create barcode image in Java applications.