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Figure 20-2. The disassembled UMadd() The disassembled version of the Madd() function shows all the MSIL required to execute the function, while the UMadd() function only shows the function declaration and the attribute SuppressUnmanagedCodeSecurityAttribute. What you don t see is the native code that will be invoked when this function is called (if the CLR allows unmanaged code or in this case native code to be run). In a nutshell, behind the scenes the compiler generates MSIL for Madd() and native code for UMadd(). You might be thinking, as I did originally, why is this code unsafe The CLR has the attributes needed to find out what is unsafe and can allow code access security to do its thing. But, if you think about it, it does sort of make sense. Since the whole assembly is loaded into memory, it might still be possible for someone to access the parts of the assembly that are unsafe. (Don t ask me how, but I m sure some hacker out there has it figured out.) Therefore, to safeguard against this possibility, the current version of the .NET runtime defines unsafe code at an assembly level, so having any unsafe code in an assembly makes the entire assembly unsafe.

As its name suggests, BasicHttpBinding is the simplest of all web service centric protocols. Specifically, this binding ensures that your WCF service conforms to a specification named WS-I Basic Profile 1.1 (defined by WS-I). The main reason to use this binding is for maintaining backward compatibility with applications that were previously built to communicate with ASP.NET web services (which have been part of the .NET libraries since version 1.0). The WSHttpBinding protocol not only incorporates support for a subset of the WS-* specification (transactions, security, and reliable sessions), but also supports the ability to handle binary data encoding using Message Transmission Optimization Mechanism (MTOM). The main benefit of WSDualHttpBinding is that it adds the ability to allow the caller and sender to communicate using duplex messaging, which is a fancy way of saying they can engage in a two-way conversation. When selecting WSDualHttpBinding, you can hook into the WCF publish/subscribe event model.

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Finally, WSFederationHttpBinding is the web service based protocol you might wish to consider when security among a group of organizations is of the utmost importance. This binding supports the WS-Trust, WS-Security, and WS-SecureConversation specifications, which are represented by the WCF CardSpace APIs.

One of the first things a C++ developer learns is arrays. Having coded them so long, it is easy to forget that .NET does it differently, when you want your code to be safe. (The usual culprit as to why I have unmanaged arrays in my code is that I cut and paste them in from legacy code and then forget to convert them, until I get all the errors when I try to compile with the /clr:safe option.) The unmanaged arrays compile and work fine if you don t use the /clr:safe option. When you examine the MSIL code generated, everything looks just fine. So why is an unmanaged array unsafe If you have coded C++ for a while, I m sure you know. It is very easy to overflow the stack by looping through an array too many times. (I ve done it so many times, I ve lost count.) There is nothing stopping a program from doing this with an unmanaged array. A managed array, on the other hand, does not allow you to go beyond the end of the array. If you try, you get a nice big exception.

L_0000: L_0001: L_0002: L_0004: L_000a: L_000b: L_0010: L_0011: L_0012: L_0017: L_0018: L_001d: L_0022: L_0023: L_0024: L_0029: L_002e: }

If you build a distributed application involving machines that are configured with the .NET 4.0 libraries (in other words, all machines are running the Windows operating system), you can gain performance benefits by bypassing web service bindings and opting for a TCP binding, which ensures that all data is encoded in a compact binary format, rather than XML. Again, when you use the bindings shown in Table 25-4, the client and host must be .NET applications. Table 25-4. The TCP-Centric WCF Bindings

Serves as a secure, reliable, optimized binding for onthe-same-machine communication between .NET applications. Provides a secure binding for P2P network applications. Serves as a secure and optimized binding suitable for cross-machine communication between .NET applications.

Unmanaged arrays, though a legal construct in C++/CLI (so long as they contain fundamental and unmanaged data types) are unsafe. If you want both arrays and safe code, you need to use managed arrays.

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