qr code generator c# mvc Lesson 1: Configuration Settings in Visual C#.NET

Encode QR Code in Visual C#.NET Lesson 1: Configuration Settings

Lesson 1: Configuration Settings
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' VB Public Class AppSettingsHelper Inherits ApplicationSettingsBase <UserScopedSetting()> _ Public Property Key() As String Get Return CType(Me("Key"), String) End Get Set(ByVal value As String) Me("Key") = value End Set End Property <ApplicationScopedSetting()> _ Public Property SettingValues() As String Get Return CType(Me("SettingValue"), String) End Get Set(ByVal value As String) Me("SettingValue") = value End Set End Property End Class // C# class AppSettingsHelper : ApplicationSettingsBase { [UserScopedSetting()] public String Key { get { return (this["Key"] as String); } set { this["Key"] = value;} } [ApplicationScopedSetting()] public String SettingValue { get { return (this["SettingValue"] as String); } set { this["SettingValue"] = value; } } }
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The last area that remains to be discussed here with respect to configuration is configuring remote components. Few areas benefit from configuration as much as remoting. If configuration with remoting is used correctly, you will gain multiple benefits. The first benefit is that you can add assemblies without having to recompile and redeploy your application. In a world where downtime can be devastating, this factor alone justifies using this approach. However, there are other benefits as well. You can change where assemblies are hosted without having to recompile and redeploy. For the same reason just mentioned, this is a major benefit. Let s use an example to help illuminate the benefits here.
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Installing and Configuring Applications
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Assume that you have a traditional three-tier application with a presentation layer, business layer, and data access layer. Assume further that all three layers run on the same machine. It all works well, but due to a growing user base the application starts to perform sluggishly. This result isn t all that surprising because every part of the application is running on the same machine. If you don t use remoting, not a lot can be done other than buying more powerful hardware. This solution is expensive, and it s impractical because users might not appreciate the downtime. If you use remoting, you can move the assemblies to other machines to spread out the load. However, if you registered your components in code, you ll have to recompile the assemblies with the new references and locations and redeploy. In a zero-downtime environment, this might not be a viable option and all the benefits of remoting are effectively whittled away. However, if you use remoting and configuration, you can simply copy the assemblies to the new machine or machines and change the configuration file. Without even restarting Internet Information Services (IIS), your application can consume the assemblies on new machines. Similarly, let s say that you need to modify one of the components and you wanted to add some new assemblies. Using either remoting or configuration, you d be in the same position that I first mentioned. However, using remoting and configuration, the solution is as easy as adding the files to a given machine and making the appropriate entries in the configuration file. Although this might sound enticing already, the real beauty of this approach isn t evident until you actually see it in action. The following code is all that is needed to register a component as a server:
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<system.runtime.remoting> <application name ="MyApplication"> <service> <wellknown type="FullyQualifiedName,AssemblyName" mode="Singleton" objectUri="MyClass.rem" </service> </application> </system.runtime.remoting>
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Essentially, all that s required is specifying the fully qualified object name and assembly, the type of object (Singleton, Single Call), and the Uniform Resource Identifier (URI). If you plan on hosting the assembly in IIS, be aware that you need to use the .rem extension. It s just as simple to configure the client application to consume the assembly. The only difference is that the mode doesn t need to be specified and the URI needs to point to the virtual directory and port of the machine that the object is to be hosted
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