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Although this approach certainly has some advantages, it has some drawbacks, too The most notable of these is that it can be challenging to efficiently get the data from the persistence object into or out of the business object For the persistence object to load data into the business object, it must be able to bypass business and validation processing in the business object and somehow load raw data into it directly If the persistence object tries to load data into the object using the object s public properties, you ll run into a series of issues: The data already in the database is presumed valid, so a lot of processing time is wasted unnecessarily revalidating data This can lead to a serious performance problem when loading a large group of objects There s no way to load read-only property values. .net code 39 reader Code 39 Reader In VB. NET - OnBarcode
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NET barcode reader and generator SDK for developers. It supports ... Supported barcode types: Australian Post, Aztec, Code11, Code39 , Code128, Codabar,. Windows Workflow Foundation (WF) was first introduced in 2006 with .NET 3.0. It is probably fair to say that WF didn t receive the widespread adoption Microsoft was hoping for. This lack of uptake was probably due to a number of factors: Although the WF designer offers a natural way of working, it is a very different way of developing applications and contains a new API to master. Slow performance. Writing your own work flow activities was not as easy as it could be. Handling and passing data between activities was cumbersome Limited support for messaging scenarios and integration with WCF. Some developers were confused by the hosting model. A clunky designer interface made you want to poke your own eyes out (OK, it wasn t that bad but it wasn t that good either). Figure 9-1. The if statement The following code shows examples of if statements: // With a simple statement if( x <= 10 ) z = x 1; This could be implemented using reflection or by designing the business object to expose its private fields for manipulation But the former is slow, and the latter is just plain bad object design: it allows the UI developer (or any other code) to manipulate these fields, too That s just asking for the abuse of the objects, which will invariably lead to code that s impossible to maintain What s needed is a workable compromise, where the actual data access code is in one object while the code to load the business object s fields is in the business object itself This can be accomplished by creating a separate data access layer (DAL) assembly that is invoked by the business object The DAL defines an interface the business object can use to retrieve and store information, as shown in Figure 2-8.. Your implementation of the Equals method returns true if the two instances are equal in your custom policy. You must make sure that the GetHashCode implementation and the Equals method are consistent so that two instances that the Equals method reports as being equal should return the same hash code. Listing 19-31 demonstrates implementing a custom equality policy using the IEqualityComparer<T> interface and the Dictionary<TKey, TVal> class. Listing 19-31. Using the IEqualityComparer<T> Interface using System; using System.Collections.Generic; namespace Listing 31 { class Listing 31 { static void Main(string[] args) { // create the Dictionary Dictionary<string, string> dict = new Dictionary<string, string> (new StringLengthEqualityComparer()) { {"apple", "green"}, {"banana", "yellow"}, }; bool containsKey = dict.ContainsKey("mango"); Console.WriteLine("Dictionary contains key 'mango': {0}", .net code 39 reader NET Code 39 Reader - Barcode SDK
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