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Assembly.Load Method (AssemblyName)

.NET Framework 1.1

Loads an assembly given its AssemblyName.

[Visual Basic]
Overloads Public Shared Function Load( _
   ByVal assemblyRef As AssemblyName _
) As Assembly
public static Assembly Load(
 AssemblyName assemblyRef
public: static Assembly* Load(
 AssemblyName* assemblyRef
public static function Load(
   assemblyRef : AssemblyName
) : Assembly;


The AssemblyName object that describes the assembly to be loaded.

Return Value

The loaded assembly.


Exception Type Condition
ArgumentNullException assemblyRef is a null reference (Nothing in Visual Basic).
FileNotFoundException assemblyRef is not found.
BadImageFormatException assemblyFile is not a valid assembly.
SecurityException The caller does not have the required permission.


The Load methods use the default load context, which records the assembly name and assembly instance information for the set of assemblies that is the transitive closure of the assemblies referenced by a managed application. The default load context applies to assemblies that are loaded with a Load method and that use a fully qualified assembly reference.

Whether certain permissions are granted or not granted to an assembly is based on evidence. The rules for assembly and security evidence merging are as follows:

  • When you use a Load method with no Evidence parameter, the assembly is loaded with the evidence that the loader supplies.
  • When you use a Load method with an Evidence parameter, pieces of evidence are merged. Pieces of evidence supplied as an argument to the Load method supersede pieces of evidence supplied by the loader.
  • When you use a Load method with a Byte[] parameter to load a common object file format (COFF) image, evidence is combined. Zone, Url and Site are inherited from the calling assembly, and Hash and StrongName are taken from the COFF assembly.
  • When you use a Load method with a Byte[] parameter and Evidence to load a common object file format (COFF) image, only the supplied evidence is used. Evidence of the calling assembly and evidence of the COFF image is ignored.

Reflecting on Managed Extensions for C++ executable files might throw a BadImageFormatException. This is most likely caused by C++ compiler stripping the relocation addresses or the .Reloc section from your executable file. To preserve the .reloc address for your C++ executable file, specify /fixed:no when you are linking.


Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, .NET Compact Framework

.NET Framework Security: 

See Also

Assembly Class | Assembly Members | System.Reflection Namespace | Assembly.Load Overload List | AssemblyName