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The next 5 percent of use cases are more difficult; queries become complex, transaction semantics are unclear at first, and performance bottlenecks are hidden. You can solve these problems with NHibernate elegantly and keep your application portable, but you ll also need some experience to get it right. NHibernate s learning curve is high at first. In our experience, a developer needs at least two to four weeks to learn the basics. Don t jump on NHibernate one week before your project deadline it won t save you. Be prepared to invest more time than you would need for another web application framework or simple utility. Finally, use SQL and ADO.NET for the 5 percent of use cases you can t implement with NHibernate, such as mass data manipulation or complex reporting queries with vendor-specific SQL functions. Many tasks aren t inherently object-oriented. Forcing ORM can easily cripple the performance of your application. Once again: Use the right tool for the right job. There are other places where you must carefully think about the right approach. For example, you can add services using many techniques, each of which has pros and cons. Let s study the case of audit logging. c# ean 13 reader .NET EAN-13 Barcode Reader for C#, VB.NET, ASP.NET Applications
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MessagingToolkit Barcode library is a C# barcode library that can be used in * WinForms ... With the Barcode Reader SDK, you can decode barcodes from. So far, we ve talked about the development of an NHibernate application without taking into account many aspects and features that may be hard to plug into a layered architecture In this section, we talk about the integration of these services In the context of this book, a service is a clearly separated subsystem (set of classes) that is integrated into the main application to add functionality Note that talking about independent services (for example, using COM) is largely out of the scope of this book The most common services are audit logging and security It s also common to have business components implemented as services For example, in a messaging platform, a service may analyze messages to detect misbehaving users or filter strong language We call them services because they should be loosely coupled with the business logic (although it isn t that important for simple applications). upc barcode font for microsoft word, word pdf 417, birt ean 13, birt ean 128, birt upc-a, birt data matrix c# ean 13 reader C# Imaging - Decode 1D EAN-13 in C#.NET - RasterEdge.com
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The C# Barcode Library. Read and Write QR & Barcodes in .Net Applications. Fast & Accurate using Scans and Live Image Processing. Supports . An important property of services is that, due to their loose coupling, they can evolve and be configured independently; it s also easy to disable them without significantly affecting the main application This is why they re often part of the nonfunctional requirements Audit logging is the process of recording changes made to data (occurring events, in general) An audit log is a database table that contains information about changes made to other data specifically, about the event that results in the change For example, you may record information about creation and update events for auction Items The information that s recorded usually includes the user, the date and time of the event, what type of event occurred, and the item that was changed NHibernate has special facilities for implementing audit logs (and other similar aspects that require a persistence event mechanism). You can also use an image with any item in the report that has the BackgroundImage property. For example, you can use an embedded image as a background for a table or textbox. In this section, we use the IInterceptor interface to implement audit logging But first, we briefly discuss the. c# ean 13 reader Creating EAN-13 Barcodes with C# - CodeProject
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C# Updated on Aug 22, 2018 ... iron-software / Iron-Barcode-Reading-Barcodes-In-CSharp · 2. C# Tutorial to read barcodes and QR - see full tutorial at ... hard way (doing it manually), so you can grasp the problem s level of difficulty. Then we show you how IInterceptor makes it much easier. The hard way (the manual way) requires continuous effort through the development process. In the case of audit logging, it means calling the audit logging service each time it s needed. 10. Click the image, and then drag down so that the height of the image matches the height of the report header textbox. The top of the design grid looks like this: Can t I use database triggers Audit logs are often handled using database triggers, and we think this is an excellent approach. But it s sometimes better for the application to take responsibility, especially if complex processing is used or if portability between different databases is required. Practically speaking, you can have an implementation similar to the following: public void Save( User user ) { try { session.SaveOrUpdate( user ); AuditLog.LogEvent( LogType.Update, user ); } catch { ... } } 4: The call to the method LogEvent() of the class AuditLog generates and saves a log about this change. LogType is an enumeration; it s better than using a string. Note that you may use the Observer pattern to remove the dependency on this service; see section 9.3.2 for details about this pattern. The main advantage of this approach is that a better message can be generated for each operation, because you know exactly what you re doing each time you call this service. The disadvantages are that this approach is verbose (it clutters the code) and, more important, can be forgotten or bypassed. This is unacceptable when you re building a trustworthy audit logging service. This approach may work much better for other services; so don t discard it completely. Let s see how NHibernate allows you to automate audit logging. The advantages of this approach are the disadvantages of the hard way, and vice versa. You need to perform several steps to implement this approach: c# ean 13 reader Read & Decode EAN-13 Barcode Using C# Class Code in .NET ...
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