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Review of Strongly Named Assemblies
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By default, assemblies are private This means that they run within the context of the application domain and will never cross the boundary into another application s
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26: Windows Services
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namespace Since we are creating shared assemblies for our serviced components, we need to install them into the Global Assembly Cache A shared assembly must have a unique name that is referred to as the strong name You create a strongly named assembly by using the Strong Name utility (snexe) included in the SDK:
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sn k CustomerComponentKeyssnk
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This will create a file with public and private keys that will be used to give the assembly a guaranteed unique name Refer to 6 for more information on creating the strong-name key file The next step is to tell your application to use the key You do this by signing the assembly (adding the key to the assembly) Locate the file in the Solution Explorer called AssemblyInfocs and add the following line:
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[assembly: AssemblyKeyFile("CustomerComponentKeyssnk")]
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The compiler will now know to digitally sign the assembly using the keys found in the snk (strong-name key) file
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Installing an Assembly into GAC
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The Global Assembly Cache is a local machine storage area that holds shared assemblies It is used to store assemblies that can be shared among several applications The cache can be accessed using the GAC tool, gacutilexe This tool allows you to view and change the contents of the GAC In particular, it allows you to install assemblies into the cache or remove them from the cache The syntax is as follows:
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gacutil [options] [assembly]
PART V
EXAM TIP
You need administrative privileges to access the GAC
Table 26-4 displays the options available with the GAC tool EXAM TIP Example of installing our serviced component into the GAC gacutil /i CustomerComponentdll
Table 26-4 gacutilexe Options
Option
Description
/h /I /u /l
Displays help topics for the gacutilexe tool Installs an assembly into the GAC Uninstalls an assembly from the GAC Lists the contents of the GAC
MCAD/MCSD Visual C# NET Certification All-in-One Exam Guide
In the Windows 2000 operating system, COM+ services are easier to manage In Windows NT, you may remember that you had to add the MTS (Microsoft Transaction Server) from the Windows Option Pack Fortunately, with Windows 2000, it is an integral part of the operating system Access the Component Services Tool from Start | Settings | Administrative Tools (in Windows 2000 Professional) This will open a Component Services console as shown in Figure 26-12 Expand Component Services in the left panel, as shown in Figure 26-13 You will see the hierarchical display on the left side and the details on the right side of the console By expanding COM+ Utilities, you can drill into the actual components and manage them Each component is represented by the round circle with a plus (+) sign in the middle (see Figure 26-13) When a component is being accessed, the circle will spin You can
Figure 26-12
The Component Services tool
26: Windows Services
PART V
Figure 26-13
Looking at the components
see the properties of the component by right-clicking on the component (in the right pane) and selecting Properties (see Figure 26-14) Figure 26-14 shows the General properties name, description (this can be modified), the DLL, class ID (CLSID), and the application identifier You can manage the component using the following tabs on the Properties dialog box: Transactions In the Transactions tab (see Figure 26-15), you can specify the transaction support Disabled, Not Supported, Supported, Required, and Requires New You can also specify the transaction timeout if supported
MCAD/MCSD Visual C# NET Certification All-in-One Exam Guide
Figure 26-14
Properties of the component
Security If the security attribute has been added to your component, you will be able to configure the security using Security tab (see Figure 26-16) Here you can set the authorization and the security roles Activation Using the Activation tab (see Figure 26-17), you can set object pooling properties, as well as JIT (just-in-time) activation Remember that these properties are all COM+ services Concurrency In Figure 26-18, you can see that threading and synchronization support can be configured through the Concurrency tab Notice that our threading model is set, by default, to Any Apartment An apartment is a logical container for processes Take a moment to look at the interfaces that have been created to make your component visible to COM Figure 26-19 shows the Component Services console tree expanded to dig deeper into the CustomerComponentCustomer component By opening the Interfaces folder (see Figure 26-19), you can see that behind the scenes a number of interfaces have been created to work with COM By right-clicking on
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