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If you declare the Print method of SecondDerived as override, then it will override both the lessderived versions of the method, as shown in Figure 7-9. If a reference to the base class is used to call Print, it gets passed all the way up the chain to the implementation in class SecondDerived.
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An array of bytes up to 64 KB A Boolean value A 64-bit value expressed as UTC time; range is 1/1/1600 to 12/31/9999 A 64-bit floating point value A 128-bit globally unique identifier A 32-bit integer A 64-bit integer A UTF-16-encoded value; may be up to 64 KB
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Tip You can use the nongeneric legacy collection classes as data sources with just a little preparatory work to help tell LINQ what data type is contained in the collection. See the Using Legacy Collections as LINQ Data Sources section later in this chapter.
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Table 8-8. NoBot Control Properties Property Name
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As an alternative to a custom token manager, you can implement a policy file which states that incoming requests to the service token provider must be digitally signed. The WSE 2.0 infrastructure will automatically enforce the policy without requiring you to write custom code. By this point you may have lost track of all the edits to the web.config file that are required in order to implement support for secure conversation. Listing 8-4 shows the full listing for the web.config file. Listing 8-4. The web.config Configuration Settings for the Security Token Service Provider (Implemented in the WSSecureConvService Sample Solution)
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Step 2: The security token service provider verifies the request and issues a security context token back to the client. The STS provider verifies the integrity of the signed request. It then generates a security context token and delivers it to the client. In the sample solution the Web service itself also acts as the security token service. You can, however, deploy the STS as a separate service. The security context token is actually returned from the STS as a so-called request security token (RST). The client can then extract the security context token from the RST. WSE 2.0 provides all of the support classes that you need to handle these tasks in code. Steps 3 and 4: The client and the Web service use the security context token for further communication. The client and Web service use the security context token to secure back-and-forth request and response communications with each other. The security context token can be used like any standard security token. It inherits from the same base classes and its usage is no different from the security tokens you learned how to work with in 6. Security context tokens may be cached in a global cache for future retrieval, for example, when the client will be issuing multiple requests over a period of time. We will look at how to do this later in the chapter. Programming-wise, Web Services Enhancements (WSE) 2.0 makes it very easy to implement a service token provider because the WSE infrastructure will automatically issue security context tokens. This feature is enabled by simply adding a configuration element to the service token provider s configuration file. The STS provider can be incorporated into the client s target Web service, or the STS provider can be implemented as a dedicated Web service. There is little difference in the code between a hosted service token provider (that resides in the client s target Web service) and a dedicated service token provider (that resides on a separate domain). There are some significant configuration and deployment differences between the two models, but code-wise they are very similar.
To avoid conversion problems, you should avoid floating point numbers with properties. That s exactly what Microsoft does with the built-in components provided with the SDK. For example, for the battery component, the voltage is described as an integer in millivolts, instead of in volts. There is an approach to solve the conversion issue when it can t be avoided. You need to override the Configure method of your emulator. Right before the analysis of the configuration file, you need to set the invariant culture, and right after the configuration, set it back to the original culture (see Listing 12-10). After that, your emulator will interpret the configuration file without variation for cultures; the invariant culture is equal to the US English culture. Listing 12-10. Culture Invariant Parsing of the Configuration File class Program : Emulator { public override void Configure(System.Xml.XmlReader reader) { Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture; base.Configure(reader); Thread.CurrentThread.CurrentCulture = CultureInfo.InstalledUICulture; } } Enumeration properties are described directly as names of the enumeration values; whether they are uppercase or lowercase does not matter. For example, the enumeration MyEnum {NameA, NameB, NameC}; is used in the XML file as follows: <MyComponent> <MyEnumProperty>NameB</MyEnumProperty> </MyComponent> In addition, you can specify the integer value of an enumeration member. This is used, for example, when describing a pin number for properties of the Cpu.Pin type for GPIO ports. If you do not explicitly specify a particular integer value for an enumeration member, the successive numbering starts at 0 for the first member. NameA thus has the value 0, NameB the value 1, and NameC the value 2. Therefore, both of the following C# declarations are equal: MyEnum {NameA, NameB, NameC}; MyEnum {NameA = 0, NameB = 1, NameC = 2};
s Note
using Visual Studio, the .NET Framework offers the soapsuds.exe command line utility, which can also create the proxy. Because of the tight integration of Web Services into the .NET Framework and Visual Studio, developers can avoid dealing with the details of publishing and consuming web services. This means that you can focus on how to use them in your business applications, rather than worrying about how to make them. Now that you have a basic understanding of the technologies behind Web Services, let s discuss the two architectural world views most commonly used when discussing Web Services.
Figure 1-4. Data organized in monthly columns
AcceptChanges() is actually the simplest of the three methods. If changes are being accepted, it means that the current values in the object are the ones that should be kept, and the most recent snapshot is now meaningless and can be discarded. Like CopyState(), once this method is complete, a virtual AcceptChangesComplete() method is called to allow subclasses to take additional actions. In concept, this means that all AcceptChanges() needs to do is discard the most recent snapshot: _stateStack.Pop(); However, it is important to remember that the object may have child objects, and they need to know to accept changes as well. This requires looping through the object s fields to find any child objects that implement IUndoableObject. The AcceptChanges() method call must be cascaded to them, too. The process of looping through the fields of the object is the same as in CopyState() and UndoChanges(). The only difference is where the method call is cascaded:
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