how to generate barcode in asp net core

barcode in asp net core

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One additional point here: It is worth noting that all classes in C# implicitly inherit from the object class even when it is not specified. This ensures that all classes have a common ancestor. So even though it is not shown, our Photograph class inherits from the base System.Object class implicitly, which is equivalent to the C# object class. Now that we understand the framework for our classes, let s perform the actual implementation. This section will create the class library in Visual Studio, discuss creating such a library using the command line tools, and provide the initial implementation of our PhotoAlbum and Photograph classes.

# is a language designed for the modern computing environment, of which the Internet is, obviously, an important part A main design criteria for C# was, therefore, to include those features necessary for accessing the Internet Although earlier languages, such as C and C++, could be used to access the Internet, support serverside operations, download files, and obtain resources, the process was not as streamlined as most programmers would like C# remedies that situation Using standard features of C# and the NET Framework, it is easy to Internet-enable your applications and write other types of Internet-based code Networking support is contained in several namespaces defined by the NET Framework The primary namespace for networking is SystemNet It defines a large number of highlevel, easy-to-use classes that support the various types of operations common to the Internet Several namespaces nested under SystemNet are also provided For example, low-level networking control through sockets is found in SystemNetSockets Mail support is found in SystemNetMail Support for secure network streams is found in SystemNetSecurity Several other nested namespaces provide additional functionality Another important networking-related namespace is SystemWeb It (and its nested namespaces) support ASPNET-based network applications Although the NET Framework offers great flexibility and many options for networking, for many applications the functionality provided by SystemNet is a best choice It offers both convenience and ease-of-use For this reason, SystemNet is the namespace we will be using in this chapter

SystemNet is a large namespace that contains many members It is far beyond the scope of this chapter to discuss them all or to discuss all aspects related to Internet programming (In fact, an entire book is needed to fully cover networking and C# s support for it in detail) However, it is worthwhile to list the members of SystemNet so you have an idea of what is available for your use

CREATING THE CLASS LIBRARY Enough preparation: time to create our library. If you are not using Visual Studio .NET here, create your library as a separate directory and place the files discussed here in it. We ll give you some hints for building this from the command line later in the chapter. In this section we will create a new project as part of our MyPhotos solution. This project will build the new MyPhotoAlbum library. We will create a top-level namespace called Manning for this project, and reference the new library from our MyPhotos project.

Part II:

Set the version number of the application to 5.2. CREATE A REUSABLE LIBRARY IN VISUAL STUDIO .NET Action 1 Add a new project to the MyPhotos solution.

The classes defined by SystemNet are shown here:

AuthenticationManager Cookie CookieContainer CredentialCache DnsPermission DownloadDataCompletedEventArgs DownloadStringCompletedEventArgs EndpointPermission FileWebResponse FtpWebResponse HttpListenerBasicIdentity HttpListenerException HttpListenerRequest HttpVersion HttpWebResponse IPEndPoint IPHostEntry NetworkCredential OpenWriteCompletedEventArgs ServicePoint SocketAddress SocketPermissionAttribute UploadFileCompletedEventArgs UploadStringCompletedEventArgs WebClient WebHeaderCollection WebPermissionAttribute WebRequest WebRequestMethodsFile WebRequestMethodsHttp Authorization CookieCollection CookieException Dns DnsPermissionAttribute DownloadProgressChangedEventArgs EndPoint FileWebRequest FtpWebRequest HttpListener HttpListenerContext HttpListenerPrefixCollection HttpListenerResponse HttpWebRequest IPAddress IPEndPointCollection IrDAEndPoint OpenReadCompletedEventArgs ProtocolViolationException ServicePointManager SocketPermission UploadDataCompletedEventArgs UploadProgressChangedEventArgs UploadValuesCompletedEventArgs WebException WebPermission WebProxy WebRequestMethods WebRequestMethodsFtp WebResponse

a. Click the File menu in Visual Studio .NET. b. Click on the Add Project menu. c. Select the New Project item.

SystemNet defines the following interfaces:

CREATE A REUSABLE LIBRARY IN VISUAL STUDIO .NET (continued) Action 2 Configure the new project as a class library named MyPhotoAlbum.

IAuthenticationModule ICredentials IWebProxyScript ICertificatePolicy ICredentialsByHost IWebRequestCreate ICredentialPolicy IWebProxy

25:

a. Select Visual C# Projects as the Project Type. b. Select Class Library as the Template. c. Enter MyPhotoAlbum for the name of the project.

It defines these enumerations:

In the Solution Explorer window, the new project appears with a default initial class named Class1. The main window displays the Class1.cs source file.

AuthenticationSchemes HttpRequestHeader NetworkAccess WebExceptionStatus DecompressionMethods HttpResponseHeader SecurityProtocolType FtpStatusCode HttpStatusCode TransportType

4: