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.NET runtime loader and binder events

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The events described in this article collect information relating to loading and unloading assemblies and modules. For more information about how to use these events for diagnostic purposes, see logging and tracing .NET applications

Keyword for raising the event Event Level
LoaderKeyword (0x8) DomainModuleLoad_V1 Informational (4)
Event Event ID Description
DomainModuleLoad_V1 151 Raised when a module is loaded for an application domain.

ModuleLoad_V2 event

Keyword for raising the event Event Level
LoaderKeyword (0x8) DomainModuleLoad_V1 Informational (4)
Event Event ID Description
ModuleLoad_V2 152 Raised when a module is loaded during the lifetime of a process.
Field name Data type Description
ModuleID win:UInt64 Unique ID for the module.
AssemblyID win:UInt64 ID of the assembly in which this module resides.
ModuleFlags win:UInt32 0x1: Domain neutral module.

0x2: Module has a native image.

0x4: Dynamic module.

0x8: Manifest module.
Reserved1 win:UInt32 Reserved field.
ModuleILPath win:UnicodeString Path of the Common Intermediate Language (CIL) image for the module, or dynamic module name if it is a dynamic assembly (null-terminated).
ModuleNativePath win:UnicodeString Path of the module native image, if present (null-terminated).
ClrInstanceID win:UInt16 Unique ID for the instance of CLR or CoreCLR.
ManagedPdbSignature win:GUID GUID signature of the managed program database (PDB) that matches this module.
ManagedPdbAge win:UInt32 Age number written to the managed PDB that matches this module.
ManagedPdbBuildPath win:UnicodeString Path to the location where the managed PDB that matches this module was built. In some cases, this may just be a file name.
NativePdbSignature win:GUID GUID signature of the Native Image Generator (NGen) PDB that matches this module, if applicable.
NativePdbAge win:UInt32 Age number written to the NGen PDB that matches this module, if applicable.
NativePdbBuildPath win:UnicodeString Path to the location where the NGen PDB that matches this module was built, if applicable. In some cases, this may just be a file name.

ModuleUnload_V2 event

Keyword for raising the event Event Level
LoaderKeyword (0x8) DomainModuleLoad_V1 Informational (4)
Event Event ID Description
ModuleUnload_V2 153 Raised when a module is unloaded during the lifetime of a process.
Field name Data type Description
ModuleID win:UInt64 Unique ID for the module.
AssemblyID win:UInt64 ID of the assembly in which this module resides.
ModuleFlags win:UInt32 0x1: Domain neutral module.

0x2: Module has a native image.

0x4: Dynamic module.

0x8: Manifest module.
Reserved1 win:UInt32 Reserved field.
ModuleILPath win:UnicodeString Path of the Common Intermediate Language (CIL) image for the module, or dynamic module name if it is a dynamic assembly (null-terminated).
ModuleNativePath win:UnicodeString Path of the module native image, if present (null-terminated).
ClrInstanceID win:UInt16 Unique ID for the instance of CLR or CoreCLR.
ManagedPdbSignature win:GUID GUID signature of the managed program database (PDB) that matches this module.
ManagedPdbAge win:UInt32 Age number written to the managed PDB that matches this module.
ManagedPdbBuildPath win:UnicodeString Path to the location where the managed PDB that matches this module was built. In some cases, this may just be a file name.
NativePdbSignature win:GUID GUID signature of the Native Image Generator (NGen) PDB that matches this module, if applicable.
NativePdbAge win:UInt32 Age number written to the NGen PDB that matches this module, if applicable.
NativePdbBuildPath win:UnicodeString Path to the location where the NGen PDB that matches this module was built, if applicable. In some cases, this may just be a file name.

ModuleDCStart_V2 event

Keyword for raising the event Event Level
LoaderKeyword (0x8) DomainModuleLoad_V1 Informational (4)
Event Event ID Description
ModuleDCStart_V2 153 Enumerates modules during a start rundown.
Field name Data type Description
ModuleID win:UInt64 Unique ID for the module.
AssemblyID win:UInt64 ID of the assembly in which this module resides.
ModuleFlags win:UInt32 0x1: Domain neutral module.

0x2: Module has a native image.

0x4: Dynamic module.

0x8: Manifest module.
Reserved1 win:UInt32 Reserved field.
ModuleILPath win:UnicodeString Path of the Common Intermediate Language (CIL) image for the module, or dynamic module name if it is a dynamic assembly (null-terminated).
ModuleNativePath win:UnicodeString Path of the module native image, if present (null-terminated).
ClrInstanceID win:UInt16 Unique ID for the instance of CLR or CoreCLR.
ManagedPdbSignature win:GUID GUID signature of the managed program database (PDB) that matches this module.
ManagedPdbAge win:UInt32 Age number written to the managed PDB that matches this module.
ManagedPdbBuildPath win:UnicodeString Path to the location where the managed PDB that matches this module was built. In some cases, this may just be a file name.
NativePdbSignature win:GUID GUID signature of the Native Image Generator (NGen) PDB that matches this module, if applicable.
NativePdbAge win:UInt32 Age number written to the NGen PDB that matches this module, if applicable.
NativePdbBuildPath win:UnicodeString Path to the location where the NGen PDB that matches this module was built, if applicable. In some cases, this may just be a file name.

ModuleDCEnd_V2 event

Keyword for raising the event Event Level
LoaderKeyword (0x8) DomainModuleLoad_V1 Informational (4)
Event Event ID Description
ModuleDCEnd_V2 154 Enumerates modules during an end rundown.
Field name Data type Description
ModuleID win:UInt64 Unique ID for the module.
AssemblyID win:UInt64 ID of the assembly in which this module resides.
ModuleFlags win:UInt32 0x1: Domain neutral module.

0x2: Module has a native image.

0x4: Dynamic module.

0x8: Manifest module.
Reserved1 win:UInt32 Reserved field.
ModuleILPath win:UnicodeString Path of the Common Intermediate Language (CIL) image for the module, or dynamic module name if it is a dynamic assembly (null-terminated).
ModuleNativePath win:UnicodeString Path of the module native image, if present (null-terminated).
ClrInstanceID win:UInt16 Unique ID for the instance of CLR or CoreCLR.
ManagedPdbSignature win:GUID GUID signature of the managed program database (PDB) that matches this module.
ManagedPdbAge win:UInt32 Age number written to the managed PDB that matches this module.
ManagedPdbBuildPath win:UnicodeString Path to the location where the managed PDB that matches this module was built. In some cases, this may just be a file name.
NativePdbSignature win:GUID GUID signature of the Native Image Generator (NGen) PDB that matches this module, if applicable.
NativePdbAge win:UInt32 Age number written to the NGen PDB that matches this module, if applicable.
NativePdbBuildPath win:UnicodeString Path to the location where the NGen PDB that matches this module was built, if applicable. In some cases, this may just be a file name.

AssemblyLoad_V1 event

Keyword for raising the event Event Level
LoaderKeyword (0x8) DomainModuleLoad_V1 Informational (4)
Event Event ID Description
AssemblyLoad_V1 154 Raised when an assembly is loaded.
Field name Data type Description
AssemblyID win:UInt64 Unique ID for the assembly.
AppDomainID win:UInt64 ID of the domain of this assembly.
BindingID win:UInt64 ID that uniquely identifies the assembly binding.
AssemblyFlags win:UInt32 0x1: Domain neutral assembly.

0x2: Dynamic assembly.

0x4: Assembly has a native image.

0x8: Collectible assembly.
AssemblyName win:UnicodeString Fully qualified assembly name.
ClrInstanceID win:UInt16 Unique ID for the instance of CoreCLR.

AssemblyUnload_V1 event

Keyword for raising the event Event Level
LoaderKeyword (0x8) DomainModuleLoad_V1 Informational (4)
Event Event ID Description
FireAssemblyUnload_V1 155 Raised when an assembly is loaded.
Field name Data type Description
AssemblyID win:UInt64 Unique ID for the assembly.
AppDomainID win:UInt64 ID of the domain of this assembly.
BindingID win:UInt64 ID that uniquely identifies the assembly binding.
AssemblyFlags win:UInt32 0x1: Domain neutral assembly.

0x2: Dynamic assembly.

0x4: Assembly has a native image.

0x8: Collectible assembly.
AssemblyName win:UnicodeString Fully qualified assembly name.
ClrInstanceID win:UInt16 Unique ID for the instance of CoreCLR.

AssemblyDCStart_V1 event

Keyword for raising the event Event Level
LoaderKeyword (0x8) DomainModuleLoad_V1 Informational (4)
Event Event ID Description
AssemblyDCStart_V1 155 Enumerates assemblies during a start rundown.
Field name Data type Description
AssemblyID win:UInt64 Unique ID for the assembly.
AppDomainID win:UInt64 ID of the domain of this assembly.
BindingID win:UInt64 ID that uniquely identifies the assembly binding.
AssemblyFlags win:UInt32 0x1: Domain neutral assembly.

0x2: Dynamic assembly.

0x4: Assembly has a native image.

0x8: Collectible assembly.
AssemblyName win:UnicodeString Fully qualified assembly name.
ClrInstanceID win:UInt16 Unique ID for the instance of CoreCLR.

AssemblyLoadStart event

Keyword for raising the event Event Level
Binder (0x4) AssemblyLoadStart Informational (4)
Event Event ID Description
AssemblyLoadStart 290 An assembly load has been requested.
Field name Data type Description
AssemblyName win:UnicodeString Name of assembly name.
AssemblyPath win:UnicodeString Path of assembly name.
RequestingAssembly win:UnicodeString Name of the requesting ("parent") assembly.
AssemblyLoadContext win:UnicodeString Load context of the assembly.
RequestingAssemblyLoadContext win:UnicodeString Load context of the requesting ("parent") assembly.
ClrInstanceID win:UInt16 Unique ID for the instance of CoreCLR.

AssemblyLoadStop event

Keyword for raising the event Event Level
Binder (0x4) AssemblyLoadStart Informational (4)
Event Event ID Description
AssemblyLoadStart 291 An assembly load has been requested.
Field name Data type Description
AssemblyName win:UnicodeString Name of assembly name.
AssemblyPath win:UnicodeString Path of assembly name.
RequestingAssembly win:UnicodeString Name of the requesting ("parent") assembly.
AssemblyLoadContext win:UnicodeString Load context of the assembly.
RequestingAssemblyLoadContext win:UnicodeString Load context of the requesting ("parent") assembly.
Success win:Boolean Whether the assembly load succeeded.
ResultAssemblyName win:UnicodeString The name of assembly that was loaded.
ResultAssemblyPath win:UnicodeString The path of the assembly that was loaded from.
Cached win:UnicodeString Whether the load was cached.
ClrInstanceID win:UInt16 Unique ID for the instance of CoreCLR.

ResolutionAttempted event

Keyword for raising the event Level
Binder (0x4) Informational (4)
Event Event ID Description
ResolutionAttempted 292 An assembly load has been requested.
Field name Data type Description
AssemblyName win:UnicodeString Name of assembly name.
Stage win:UInt16 The resolution stage.

0: Find in load.

1: Assembly Load Context

2: Application assemblies.

3: Default assembly load context fallback.

4: Resolve satellite assembly.

5: Assembly load context resolving.

6: AppDomain assembly resolving.
AssemblyLoadContext win:UnicodeString Load context of the assembly.
Result win:UInt16 The result of resolution attempt.

0: Success

1: Assembly NotFound

2: Incompatible Version

3: Mismatched Assembly Name

4: Failure

5: Exception
ResultAssemblyName win:UnicodeString The name of assembly that was resolved.
ResultAssemblyPath win:UnicodeString The path of the assembly that was resolved from.
ErrorMessage win:UnicodeString Error message if there is an exception.
ClrInstanceID win:UInt16 Unique ID for the instance of CoreCLR.

AssemblyLoadContextResolvingHandlerInvoked event

Keyword for raising the event Level
Binder (0x4) Informational (4)
Event Event ID Description
AssemblyLoadContextResolvingHandlerInvoked 293 An AssemblyLoadContext.Resolving handler has been invoked.
Field name Data type Description
AssemblyName win:UnicodeString Name of assembly name.
HandlerName win:UnicodeString Name of the handler invoked.
AssemblyLoadContext win:UnicodeString Load context of the assembly.
ResultAssemblyName win:UnicodeString The name of assembly that was resolved.
ResultAssemblyPath win:UnicodeString The path of the assembly that was resolved from.
ClrInstanceID win:UInt16 Unique ID for the instance of CoreCLR.

AppDomainAssemblyResolveHandlerInvoked event

Keyword for raising the event Level
Binder (0x4) Informational (4)
Event Event ID Description
AppDomainAssemblyResolveHandlerInvoked 294 An AppDomain.AssemblyResolve handler has been invoked.
Field name Data type Description
AssemblyName win:UnicodeString Name of assembly name.
HandlerName win:UnicodeString Name of the handler invoked.
ResultAssemblyName win:UnicodeString The name of assembly that was resolved.
ResultAssemblyPath win:UnicodeString The path of the assembly that was resolved from.
ClrInstanceID win:UInt16 Unique ID for the instance of CoreCLR.

AssemblyLoadFromResolveHandlerInvoked event

Keyword for raising the event Level
Binder (0x4) Informational (4)
Event Event ID Description
AssemblyLoadFromResolveHandlerInvoked 295 An Assembly.LoadFrom handler has been invoked.
Field name Data type Description
AssemblyName win:UnicodeString Name of assembly name.
IsTrackedLoad win:Boolean Whether the assembly load is tracked.
RequestingAssemblyPath win:UnicodeString The path of the requesting assembly.
ComputedRequestedAssemblyPath win:UnicodeString The path of the assembly that was requested.
ClrInstanceID win:UInt16 Unique ID for the instance of CoreCLR.

KnownPathProbed event

Keyword for raising the event Level
Binder (0x4) Informational (4)
Event Event ID Description
KnownPathProbed 296 A known path was probed for an assembly.
Field Name Data Type Description
FilePath win:UnicodeString Path probed.
Source win:UInt16 Source of the path probed.

0x0:Application Assemblies.

0x1:App native image path.

0x2:App path.

0x3:Platform resource roots.

0x4:Satellite Subdirectory.
Result win:UInt32 HRESULT for the probe.
ClrInstanceID win:UInt16 Unique ID for the instance of CoreCLR.