Assembly.LoadFrom Method (String)
Assembly: mscorlib (in mscorlib.dll)
'Declaration Public Shared Function LoadFrom ( _ assemblyFile As String _ ) As Assembly 'Usage Dim assemblyFile As String Dim returnValue As Assembly returnValue = Assembly.LoadFrom(assemblyFile)
The name or path of the file that contains the manifest of the assembly.
Return ValueThe loaded assembly.
assemblyFile is a null reference (Nothing in Visual Basic).
assemblyFile is not found, or the module you are trying to load does not specify a filename extension.
A file that was found could not be loaded.
assemblyFile is not a valid assembly.
A codebase that does not start with "file://" was specified without the required WebPermission.
The assemblyFile parameter is the empty string ("").
The assemblyFile parameter must refer to a URI without escape characters. This method supplies escape characters for all invalid characters in the URI.
assemblyFile is relative to the current directory, and the assembly is loaded into the domain of the caller.
If an assembly with the same identity is already loaded, LoadFrom returns the loaded assembly even if a different path was specified.
If an assembly is loaded with LoadFrom, and later an assembly in the load context attempts to load same the assembly by display name, the load attempt fails. This can occur when an assembly is de-serialized.
If an assembly is loaded with LoadFrom, and the probing path includes an assembly with the same identity but a different location, an InvalidCastException, MissingMethodException, or other unexpected behavior can occur.
LoadFrom demands Read and F:System.Security.Permissions.FileIOPermissionAccess.PathDiscovery, or WebPermission, on the specified path.
If a native image exists for assemblyFile, it is not used. The assembly cannot be loaded as domain neutral.
In the .NET Framework version 1.0 and 1.1, policy is not applied.
The following example loads an assembly given its file name or path.
Dim SampleAssembly As [Assembly] SampleAssembly = [Assembly].LoadFrom("c:\Sample.Assembly.dll") ' Obtain a reference to a method known to exist in assembly. Dim Method As MethodInfo = SampleAssembly.GetTypes()(0).GetMethod("Method1") ' Obtain a reference to the parameters collection of the MethodInfo instance. Dim Params As ParameterInfo() = Method.GetParameters() ' Display information about method parameters. ' Param = sParam1 ' Type = System.String ' Position = 0 ' Optional=False Dim Param As ParameterInfo For Each Param In Params Console.WriteLine(("Param=" + Param.Name.ToString())) Console.WriteLine((" Type=" + Param.ParameterType.ToString())) Console.WriteLine((" Position=" + Param.Position.ToString())) Console.WriteLine((" Optional=" + Param.IsOptional.ToString())) Next Param
- FileIOPermission for reading a URI that begins with "file://". Associated enumeration: FileIOPermissionAccess.Read
- WebPermission for reading a URI that does not begin with "file://".
Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.