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We can see that 04TypeCastexe takes a dependency on the mscorlib assembly and that the identity of the assembly should be that of the specified public key token and version Please note that even though dependent assemblies are identified via assembly identity, policy can be used to redirect dependent assemblies to other versions with different identities
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Let s now move on to the different load contexts and see in more detail which load algorithm the CLR utilizes to bind to a given assembly
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Default Load Context
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4 ASSEMBLY LOADER
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Most assemblies fall into the default load context, which is also, usually, the safest option to avoid incorrect versions of assemblies being loaded and creating complications An assembly that falls into the default load context is usually loaded using one of the variations of the AssemblyLoad API What does it mean for it to be the safest way of loading assemblies In the default load context, the CLR uses all its probing logic (see Figure 4-3) to ensure that the correct version of the assembly is used Furthermore, dependent assemblies can also be automatically found in this context as well as the load-from context This is in contrast to the load-from or load-without context where the caller more explicitly chooses the assembly, thereby running the
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Assembly load request Is assembly in the GAC Yes
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Load Assembly From GAC (based on assembly identity)
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Failure
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Figure 4-3 Default load context probing logic
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4
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risk of picking up an incorrect version The CLR s probing logic during default load context is shown in Figure 4-3 From Figure 4-3, we can see that when an assembly load request comes into the default load context, the CLR loader first checks to see if the assembly is in the GAC If so, the CLR loader proceeds to load the correct version based on the assembly identity requested If the assembly does not reside in the GAC, the CLR loader then probes a couple of additional paths including the application base path and the private binaries path If the assembly is found in either of the two locations, the CLR loader attempts the load from there
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Load-from Context
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When an assembly is loaded into the load-from context, typically by using one of the AssemblyLoadFrom, AppDomainCreateInstanceFrom, AppDomain ExecuteAssembly, API variants, the CLR s probing logic is avoided altogether putting the responsibility of assembly conflict squarely into the caller s hands All assembly dependencies are also loaded from the same path Additionally, dependent assemblies in the default load context can be used by an assembly loaded into the load-from context Figure 4-4 highlights some of the interesting aspects of the loadfrom context In Figure 4-4, we can see that assemblies with the same identity but with different paths are treated as one and the same assembly, causing a reference to the already loaded assembly to be returned Furthermore, if an assembly has been loaded into the load-from context and another attempt is made to load the same assembly into the default load context, this results in a failure
Assembly load request
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Return reference to existing assembly (even if paths are different)
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Failure
Load assembly
Success
Figure 4-4 Interesting caveats when using the load-from context
Simple Assembly Load Failure
Load-without Context
The last load context we will discuss is the load without a context This context is reserved for assemblies that, generally speaking, do not have a load context period Examples of such assemblies are those assemblies generated using the Reflection namespace and Emit APIs In these cases, the CLR does not do any type of probing The exception to the rule is when applying identity to a generated assembly using policy In this case, if an assembly is located in the GAC, it will be used At this point, we have discussed assembly identity, the Global Assembly Cache, and the different load contexts that are available Many subtle and interesting problems can occur when loading assemblies (especially when mixing load contexts) In the remaining part of this chapter, we will take a look at some real-world examples of problems and how the available tools, instrumentation, and debuggers can be used to get to the bottom of the problem