106 lines
4.9 KiB
Markdown
106 lines
4.9 KiB
Markdown
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## About
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<!-- A description of the package and where one can find more documentation -->
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This package provides a low-level .NET (ECMA-335) metadata reader and writer. It's geared for performance and is the ideal choice for building higher-level libraries that intend to provide their own object model, such as compilers. The metadata format is defined by the [ECMA-335 - Common Language Infrastructure (CLI)](http://www.ecma-international.org/publications/standards/Ecma-335.htm) specification and [its amendments](https://github.com/dotnet/runtime/blob/main/docs/design/specs/Ecma-335-Augments.md).
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The `System.Reflection.Metadata` library is included in the .NET Runtime shared framework. The package can be installed when you need to use it in other target frameworks.
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## How to Use
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<!-- A compelling example on how to use this package with code, as well as any specific guidelines for when to use the package -->
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The following example shows how to read assembly information using PEReader and MetadataReader.
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```cs
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using System;
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using System.IO;
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using System.Reflection.Metadata;
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using System.Reflection.PortableExecutable;
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class Program
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{
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static void Main()
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{
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// Open the Portable Executable (PE) file
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using var fs = new FileStream("Example.dll", FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
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using var peReader = new PEReader(fs);
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// Display PE header information
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PEHeader header = peReader.PEHeaders.PEHeader;
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Console.WriteLine($"Image base: 0x{header.ImageBase:X}");
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Console.WriteLine($"File alignment: 0x{header.FileAlignment:X}");
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Console.WriteLine($"Subsystem: {header.Subsystem}");
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// Display .NET metadata information
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if (!peReader.HasMetadata)
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{
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Console.WriteLine("Image does not contain .NET metadata");
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return;
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}
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MetadataReader mr = peReader.GetMetadataReader();
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AssemblyDefinition ad = mr.GetAssemblyDefinition();
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Console.WriteLine($"Assembly name: {ad.GetAssemblyName().ToString()}");
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Console.WriteLine();
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Console.WriteLine("Assembly attributes:");
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foreach (CustomAttributeHandle attrHandle in ad.GetCustomAttributes())
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{
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CustomAttribute attr = mr.GetCustomAttribute(attrHandle);
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// Display the attribute type full name
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if (attr.Constructor.Kind == HandleKind.MethodDefinition)
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{
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MethodDefinition mdef = mr.GetMethodDefinition((MethodDefinitionHandle)attr.Constructor);
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TypeDefinition tdef = mr.GetTypeDefinition(mdef.GetDeclaringType());
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Console.WriteLine($"{mr.GetString(tdef.Namespace)}.{mr.GetString(tdef.Name)}");
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}
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else if (attr.Constructor.Kind == HandleKind.MemberReference)
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{
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MemberReference mref = mr.GetMemberReference((MemberReferenceHandle)attr.Constructor);
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if (mref.Parent.Kind == HandleKind.TypeReference)
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{
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TypeReference tref = mr.GetTypeReference((TypeReferenceHandle)mref.Parent);
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Console.WriteLine($"{mr.GetString(tref.Namespace)}.{mr.GetString(tref.Name)}");
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}
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else if (mref.Parent.Kind == HandleKind.TypeDefinition)
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{
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TypeDefinition tdef = mr.GetTypeDefinition((TypeDefinitionHandle)mref.Parent);
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Console.WriteLine($"{mr.GetString(tdef.Namespace)}.{mr.GetString(tdef.Name)}");
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}
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}
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}
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}
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}
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```
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## Main Types
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<!-- The main types provided in this library -->
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The main types provided by this library are:
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* `System.Reflection.Metadata.MetadataReader`
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* `System.Reflection.PortableExecutable.PEReader`
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* `System.Reflection.Metadata.Ecma335.MetadataBuilder`
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* `System.Reflection.PortableExecutable.PEBuilder`
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* `System.Reflection.PortableExecutable.ManagedPEBuilder`
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## Additional Documentation
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<!-- Links to further documentation -->
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* [System.Reflection.Metadata.MetadataReader](https://docs.microsoft.com/dotnet/api/system.reflection.metadata.metadatareader)
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* [System.Reflection.PortableExecutable.PEReader](https://docs.microsoft.com/dotnet/api/system.reflection.portableexecutable.pereader)
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* [System.Reflection.Metadata.Ecma335.MetadataBuilder](https://docs.microsoft.com/dotnet/api/system.reflection.metadata.ecma335.metadatabuilder)
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* [System.Reflection.PortableExecutable.PEBuilder](https://docs.microsoft.com/dotnet/api/system.reflection.portableexecutable.pebuilder)
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* [System.Reflection.PortableExecutable.ManagedPEBuilder](https://docs.microsoft.com/dotnet/api/system.reflection.portableexecutable.managedpebuilder)
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## Feedback & Contributing
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<!-- How to provide feedback on this package and contribute to it -->
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System.Reflection.Metadata is released as open source under the [MIT license](https://licenses.nuget.org/MIT). Bug reports and contributions are welcome at [the GitHub repository](https://github.com/dotnet/runtime).
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