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You still need to handle exceptions in case the file does not exist or is not a PE file.

This enables you to avoid the extra performance cost caused by exceptions when you need to check such files. Unlike the GetAssemblyName method, the PEReader class does not throw an exception on native Portable Executable (PE) files. If the value is true, the file is an assembly. If the value is false, the file is not an assembly.Ĭall the GetMetadataReader method on the PE reader instance to create a metadata reader.Ĭheck the value of the IsAssembly property.

NET 5+, this step isn't required because this library is included in the shared framework.)Ĭreate a System.IO.FileStream instance to read data from the file you're testing.Ĭreate a instance, passing your file stream into the constructor.Ĭheck the value of the HasMetadata property. NET Framework, install the NuGet package. The GetAssemblyName method loads the test file, and then releases it once the information is read. RuntimeEnvironment.GetRuntimeDirectory(),ĪssemblyName testAssembly = AssemblyName.GetAssemblyName(path) Ĭonsole.WriteLine("Yes, the file is an assembly.") Ĭonsole.WriteLine("The file cannot be found.") Ĭonsole.WriteLine("The file is not an assembly.") Ĭonsole.WriteLine("The assembly has already been loaded.") Ĭonsole.WriteLine("Yes, the file is an Assembly.")Ĭonsole.WriteLine("The file cannot be found.")Ĭonsole.WriteLine("The file is not an Assembly.")Ĭonsole.WriteLine("The Assembly has already been loaded.") This example tests a DLL to see if it is an assembly. If a BadImageFormatException exception is thrown, the file is not an assembly. How to programmatically determine if a file is an assembly Using the AssemblyName classĬall the AssemblyName.GetAssemblyName method, passing the full file path and name of the file you are testing. For more information, see the topic How to: View assembly contents. If ILDASM reports that the file is not a portable executable (PE) file, then it is not an assembly. How to manually determine if a file is an assembly For more information on assemblies and metadata, see Assembly manifest. A file is an assembly if and only if it is managed, and contains an assembly entry in its metadata.