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On the surface, delegates seem easy to use: you define them by using C# s delegate keyword, you construct instances of them by using the familiar new operator, and you invoke the callback by using the familiar method-call syntax (except instead of a method name, you use the variable that refers to the delegate object) . However, what s really going on is quite a bit more complex than what the earlier examples illustrate . The compilers and the CLR do a lot of behind-the-scenes processing to hide the complexity . In this section, I ll focus on how the compiler and the CLR work together to implement delegates . Having this knowledge will improve your understanding of delegates and will teach you how to use them efficiently and effectively . I ll also touch on some additional features delegates make available . Let s start by reexamining this line of code:

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internal delegate void Feedback(Int32 value);

Figure 9-35

In the network, clients on all subnets except D and E will be able to obtain an IP address from the DHCP server on Subnet C:

When it sees this line, the compiler actually defines a complete class that looks something like this:

In fact, the ListView class does not provide for a DataSource property To populate its user interface with data read out of data-bindable object, you must loop through the rows and update the list items yourself The following code illustrates the behavior of the Load method: public void Load(string xmldata) { DataSet ds = new DataSet(); StringReader reader = new StringReader(xmldata); dsReadXml(reader); readerClose(); // Store the current data source and its view object m_data = dsTables[0]; m_viewOfData = new DataView(m_data); // Add columns thisColumnsClear(); for(int j=0; j<m_dataColumnsCount; j++) 493.

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Subnet A contains a DHCP relay agent. If we assume that the DHCP relay agent is configured to point toward the IP address of the DHCP server on Subnet C, DHCP clients on Subnet A will be able to obtain an address from this server. Subnet B does not contain a DHCP server or a DHCP relay agent. However, the DHCP Discover broadcasts from clients on Subnet B are able to pass through the RFC 1542 compliant router (provided that BOOTP forwarding has been enabled). Therefore, the DHCP client requests on Subnet B are received by the DHCP server on Subnet C. This DHCP server can then answer these requests accordingly.

internal class Feedback : System.MulticastDelegate { // Constructor public Feedback(Object object, IntPtr method); // Method with same prototype as specified by the source code public virtual void Invoke(Int32 value); // Methods allowing the callback to be called asynchronously public virtual IAsyncResult BeginInvoke(Int32 value, AsyncCallback callback, Object object); public virtual void EndInvoke(IAsyncResult result); }

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The class defined by the compiler has four methods: a constructor, Invoke, BeginInvoke, and EndInvoke . In this chapter, I ll concentrate on the constructor and Invoke methods . I ll address the BeginInvoke and EndInvoke methods in 27, I/O-Bound Asynchronous Operations, in the The APM and Compute-Bound Operations section . In fact, you can verify that the compiler did indeed generate this class automatically by examining the resulting assembly with ILDasm .exe, as shown in Figure 17-1 .

Subnet C contains a DHCP server. Clients on this subnet will be able to receive an address from the DHCP server directly. Subnet D does not contain a DHCP server or a DHCP relay agent. Although one of its routers is 1542-compliant, this only helps pass DHCP request broadcasts to another subnet that does not have a DHCP server or a DHCP relay agent. As a result, clients on Subnet D will not be able to obtain an address from the DHCP server on Subnet C. Subnet E, like Subnet D, does not contain a DHCP server or a DHCP relay agent. The 1542-compliant router does not allow the clients on Subnet E to connect to a DHCP server. Subnet F is configured with a DHCP relay agent. If the relay agent is configured with the address of the DHCP server on Subnet C, the clients on Subnet F will have their DHCP requests intercepted by the DHCP relay agent and answered by the DHCP server.

You cannot use the DHCP Relay Agent component on a computer running any of the following: the DHCP service, the NAT routing protocol component with automatic addressing enabled, or ICS.

In this example, the compiler has defined a class called Feedback that is derived from the System.MulticastDelegate type defined in the Framework Class Library (FCL) . (All delegate types are derived from MulticastDelegate .) Important The System.MulticastDelegate class is derived from System.Delegate,

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