generate pdf417 c# Figure 11-8. Example output from the PTWebService test web page in C#

Creation PDF 417 in C# Figure 11-8. Example output from the PTWebService test web page

Removes any whitespace characters from the start (TrimStart), end (TrimEnd), or start and end (Trim) of the current string instance.

The first step is to define the type that will be persisted. In this example, a book description will be persisted, and this description is defined as follows: public class Book { private string _isbn; private string _title; private string _author; public Book() { } public Book( string isbn, string title, string author) { _isbn = isbn; _title = title; _author = author; } public string ISBN { get { return _isbn; } private set { _isbn = value; } } public string Title { get { return _title; }

Figure 8-2. Generate from database 7. 8. Click Next. VS will now ask you for a connection (Figure 8-3). If you haven t done this already, create a new connection to the example database. Note that my database is called Book, so EF will prefix many settings with the name of the database (you may wish to change this). Click Next.

The RoleList object provides a read-only, cached list of roles that a resource can hold when assigned to a project. But that list of roles needs to be maintained, and that is the purpose behind the Roles collection. This is an editable root collection that contains a list of editable child Role objects. The Roles class illustrates how to create an editable root collection based on the template code from 7. The class inherits from BusinessListBase: <Serializable()> _ Public Class Roles Inherits BusinessListBase(Of Roles, Role) The first generic type parameter specifies the type of the collection itself, while the second provides the type of the child objects contained in the collection. An editable root collection has Business Methods, Authorization Rules, Factory Methods, and Data Access regions. By this point, you ve seen good examples of each region, so I ll just focus on the parts that are unique for a root collection. For instance, the Authorization Rules region includes only the Shared authorization rules discussed earlier in the chapter, so I ll bypass talking about that code here.

Figure 22-2 shows the structure of your program, with the event handlers attached to the events of the BackgroundWorker object.

The metadata tables specific to the generic types (other type-related tables were discussed in 7) include TypeSpec, GenericParam, and GenericParamConstraint. The records of these tables contain the following entries: The TypeSpec record contains the single entry Signature, which must hold a valid offset in the #Blob stream. The GenericParam record contains four entries: Number (2-byte zero-based ordinal of the type parameter), Flags (2-byte bit field containing the constraint flags of the type parameter), Owner (coded token of type TypeOrMethodDef, which must be a valid reference to the TypeDef or Method table), and Name (must be a valid offset in the #Strings stream, can be zero); there must be no duplicate records in the table with identical Number and Owner values. The GenericParamConstraint record contains two entries: Owner (must be a valid RID in the GenericParam table) and Constraint (coded token of type TypeDefOrRef, which must be a valid reference to the TypeDef, TypeRef, or TypeSpec table).

Generic types such as BindingList(Of T) are very powerful because they allow a developer to easily create a strongly typed instance of the generic type. The following defines a strongly typed collection of type String: Dim myStringList As BindingList(Of String) Similarly, the following defines a strongly typed collection of type Integer: Dim myIntList As BindingList(Of Integer) Since both myStringList and myIntList are of type BindingList(Of T), you might think they are polymorphic that you could write one method that could act on both fields. But you can t. Generic types are not inherited and thus do not come from the same type. This is highly counterintuitive at first glance but nonetheless is a fact of life when working with generic types. Since CSLA .NET makes use of generic types (BusinessBase(Of T), BusinessListBase(Of T, C), and so on), this is a problem. There are cases in which a UI developer will want to treat all business objects the same or at least be able to use the .NET type system to determine whether an object is a business object. In order to treat instances of a generic type polymorphically or to do type checks to see whether those instances come from the same type, the generic type must inherit from a non-generic base class or implement a non-generic interface. In the case of BindingList(Of T), the generic type implements IBindingList. So, both myStringList and myIntList can be treated as IBindingList types. To provide this type of polymorphic behavior to CSLA .NET business objects, all business base classes implement Csla.Core.IBusinessObject. This, then, is the ultimate base type for all business objects. Here s the code for IBusinessObject:

The difference between Web services technology today vs. SOA is in the level of available infrastructure support. Infrastructure in this context refers to the helper technologies and assemblies that support the implementation of an SOA solution. Stand-alone Web services require very little additional infrastructure support beyond what they already get from the .NET Web services assemblies and the built-in HTTP handlers. However, as you have seen in the conceptual overview, SOA requires a lot of infrastructure support, including multiple transport options, security infrastructure, and support for reliable messaging, to name a few. Different companies, including Microsoft and IBM, are working together to establish standard specifications that cover the full range of supporting technologies for SOA infrastructure. It is an unfortunate reality that Web services specifications are developed and advanced in a politically charged environment where companies are often rivals rather than partners. Corporate animosity causes companies to disagree on the right specifications. Sometimes different groups of companies pursue separate specifications that apply to the same purpose. Nonprofit organizations such as OASIS provide a forum for companies to cooperate in the advancement and development of Web services specifications. Read more about OASIS at http://www.oasis-open.org.

The WS-Specifications will allow developers to build Web services that are interoperable, reliable, secure, and transacted. Ultimately, the overarching goal is for Web services technology to make it into the business mainstream, and to be considered as good a business solution as more established technologies. This book does not cover all of the available WS-Specifications for two reasons: First, it is impractical because some of the specifications are too new or too poorly established to be useful to most people. Second, it is problematic because WSE implements only a few of the available WS-Specifications, albeit many of the most important ones. With these points in mind, here is a list of the WS-Specifications I will be covering in this book: WS-Security WS-Policy WS-Policy Assertions WS-Policy Attachments WS-Security Policy