IHostAssemblyStore::ProvideAssembly Method

Article
09/15/2021

Gets a reference to an assembly that is not referenced by the ICLRAssemblyReferenceList that is returned from IHostAssemblyManager::GetNonHostStoreAssemblies. The common language runtime (CLR) calls ProvideAssembly for each assembly that does not appear in the list.

Syntax

HRESULT ProvideAssembly (  
    [in]  AssemblyBindInfo *pBindInfo,  
    [out] UINT64           *pAssemblyId,  
    [out] UINT64           *pHostContext,  
    [out] IStream          **ppStmAssemblyImage,  
    [out] IStream          **ppStmPDB  
);

Parameters

pBindInfo
[in] A pointer to an AssemblyBindInfo instance that the host uses to determine certain bind characteristics, including the presence or absence of any versioning policy, and which assembly to bind to.

pAssemblyId
[out] A pointer to a unique identifier for the requested assembly for this IStream.

pHostContext
[out] A pointer to host-specific data that is used to determine the evidence of the requested assembly without the need of a platform invoke call. pHostContext corresponds to the HostContext property of the managed Assembly class.

ppStmAssemblyImage
[out] A pointer to the address of an IStream that contains the portable executable (PE) image to be loaded, or null if the assembly could not be found.

ppStmPDB
[out] A pointer to the address of an IStream that contains the program debug (PDB) information, or null if the .pdb file could not be found.

Return Value

HRESULT	Description
S_OK	`ProvideAssembly` returned successfully.
HOST_E_CLRNOTAVAILABLE	The CLR has not been loaded into a process, or the CLR is in a state in which it cannot run managed code or process the call successfully.
HOST_E_TIMEOUT	The call timed out.
HOST_E_NOT_OWNER	The caller does not own the lock.
HOST_E_ABANDONED	An event was canceled while a blocked thread or fiber was waiting on it.
E_FAIL	An unknown catastrophic failure occurred. When a method returns E_FAIL, the CLR is no longer usable within the process. Subsequent calls to hosting methods return HOST_E_CLRNOTAVAILABLE.
COR_E_FILENOTFOUND (0x80070002)	The requested assembly could not be located.
E_NOT_SUFFICIENT_BUFFER	The buffer size specified by `pAssemblyId` is not large enough to hold the identifier that the host wants to return.

Remarks

The identity value returned for pAssemblyId is specified by the host. Identifiers must be unique within the lifetime of a process. The CLR uses this value as a unique identifier for the stream. It checks each value against the values for pAssemblyId returned by other calls to ProvideAssembly. If the host returns the same pAssemblyId value for another IStream, the CLR checks whether the contents of that stream have already been mapped. If so, the runtime loads the existing copy of the image instead of mapping a new one.

Requirements

Platforms: See System Requirements.

Header: MSCorEE.h

Library: Included as a resource in MSCorEE.dll

.NET Framework Versions: Available since 2.0

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