qr code generator c# mvc Lesson 4: Configuration Management in Visual C#.NET

Drawer QR-Code in Visual C#.NET Lesson 4: Configuration Management

Lesson 4: Configuration Management
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If ChildNode.Name = "SettingValue" Then TempValue = ChildNode.InnerText End If Next Next Dim MyHandler As New ValuesHandler(ConfigValues) Return MyHandler // C# Hashtable ConfigValues = new Hashtable(); XmlElement Root = section as XmlElement; String TempValue = string.Empty; foreach (XmlNode ParentNode in Root.ChildNodes) { foreach (XmlNode ChildNode in ParentNode.ChildNodes) { if (ChildNode.Name == "Identifier") { TempValue = ChildNode.InnerText; } if (ChildNode.Name == "SettingValue") { ConfigValues[TempValue] = ChildNode.InnerText; } } } ValuesHandler MyHandler = new ValuesHandler(ConfigValues); return MyHandler;
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For convenience, we ll create another helper class that stores a HashTable object and provides a mechanism by which values can be retrieved from the table:
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' VB Public Class ValuesHandler Private customValue As Hashtable Public Sub ValuesHandler(ByVal configValues As Hashtable) Me.customValue = configValues End Sub Public Function GetValueFromKey(ByVal key As String) As String Return Me.customValue(key) End Function End Class // C# class ValuesHandler { private Hashtable customValue;
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public ValuesHandler(Hashtable configValues) { this.customValue = configValues; } public String GetValueFromKey(String key) { return this.customValue[key] as String; } }
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Now let s assume that we used a completely different methodology for the configuration file. For instance, instead of using element-based values, assume we were using attribute-based values. Our XML parsing routine would have to take this into account to populate the values. So, in effect, what happens inside the Create method is dependent on the XML you want to store in the configuration file and the corresponding object or objects you want to use to hold those values. The point to keep in mind is that this implementation is just an example and virtually any implementation you chose would be valid as long as the XML was valid and well formed. At this point, everything is in place and the application is ready to consume these values. There are two primary methods to accomplish this. The first, ConfigSettings .GetConfig is obsolete and should be used with the same amount of caution one would apply to any obsolete method. The next one is the ConfigurationManager s GetSection method:
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' VB Dim vals As ValuesHandler = _ ConfigurationManager.GetSection("MyFirstSection/DemoValues") // C# ValuesHandler vals = ConfigurationManager.GetSection("MyFirstSection/DemoValues") as ValuesHandler;
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The key point with retrieval is to ensure that you specify the correct node or nodes. Although the nuances of XML parsing are out of the scope of this lesson, we need to specify the root region where the parsing should start. Whenever the class is initialized, it will call the Create method and parse the XML accordingly. Just for reference, here s the configuration snippet without the individual values:
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<MyFirstSection> <DemoValues> </DemoValues> </MyFirstSection>
Lesson 4: Configuration Management
MyFirstSection is the name of the section, and that s where the processing begins. Via our call to GetSection, our code instructs the parser to start at DemoValues as the root node and begin processing from there. In the .NET Framework 2.0, there are new ways to accomplish the same objectives, and fortunately, these new ways are much simpler to use and much more powerful. Assume for a moment that we wanted to create a ConfigurationSection named 9Section. To create the declaration, the following should be done:
<configSections> <section name="9Section" type="9.Configuration.ConfigHandler, App_Code" /> </configSections>
Essentially, all we just did was add a custom ConfigurationSection to the configSections section of the configuration file, add a name to it, and then add the type. The first portion of the type section takes the fully qualified object name (namespace.objectname) a comma, and then the assembly name. This example used an ASP.NET 2.0 Web application that stored the class in the App_Code folder, so App_Code was used as the assembly name. So far, these are the same steps we would take to implement an IConfigurationSectionHandler object. The previous paragraph describes the declaration of the custom ConfigurationSection. Now it is necessary to implement it. For the sake of simplicity, we ll add a simple ConfigurationSection with two elements. Only one ConfigurationSection is being used in this example, although multiple ConfigurationSections can be used. When a ConfigurationSection is used, it is added to the ConfigurationSectionCollection and can be retrieved by a name or an index. Typically, as was done with IConfigurationSectionHandler objects, using the name to reference the section makes the most sense. (This is because it s a lot easier to remember something like WebServiceSettings than it is to remember that this was the ninth ConfigurationSection.) A ConfigurationSection can be simple or as complex as you would like. Attributes can be used instead of elements, or multiple elements can be added. In short, you can use just about any combination that is necessary to accomplish a given objective. The following XML segment shows the code generated for our example (again, it simply shows a ConfigurationSection named 9Section with a ConfigurationElement named LastName and a ConfigurationElement named FirstName ).
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