private static TypeSignature ReadTypeSignature(
MetadataImage image,
IBinaryStreamReader reader,
RecursionProtection protection)
{
var elementType = (ElementType)reader.ReadByte();
switch (elementType)
{
case ElementType.Array:
return(ArrayTypeSignature.FromReader(image, reader, protection));
case ElementType.Boxed:
return(BoxedTypeSignature.FromReader(image, reader, protection));
case ElementType.ByRef:
return(ByReferenceTypeSignature.FromReader(image, reader, protection));
case ElementType.CModOpt:
return(OptionalModifierSignature.FromReader(image, reader, protection));
case ElementType.CModReqD:
return(RequiredModifierSignature.FromReader(image, reader, protection));
case ElementType.Class:
return(TypeDefOrRefSignature.FromReader(image, reader, protection));
case ElementType.FnPtr:
return(FunctionPointerTypeSignature.FromReader(image, reader, protection));
case ElementType.GenericInst:
return(GenericInstanceTypeSignature.FromReader(image, reader, protection));
case ElementType.MVar:
return(GenericParameterSignature.FromReader(image, reader, GenericParameterType.Method));
case ElementType.Pinned:
return(PinnedTypeSignature.FromReader(image, reader, protection));
case ElementType.Ptr:
return(PointerTypeSignature.FromReader(image, reader, protection));
case ElementType.Sentinel:
return(SentinelTypeSignature.FromReader(image, reader, protection));
case ElementType.SzArray:
return(SzArrayTypeSignature.FromReader(image, reader, protection));
case ElementType.ValueType:
var type = TypeDefOrRefSignature.FromReader(image, reader, protection);
type.IsValueType = true;
return(type);
case ElementType.Var:
return(GenericParameterSignature.FromReader(image, reader, GenericParameterType.Type));
default:
return(MsCorLibTypeSignature.FromElementType(image, elementType));
}
}
public static TypeSignature FromReader(MetadataHeader header, IBinaryStreamReader reader)
{
var elementType = (ElementType)reader.ReadByte();
switch (elementType)
{
case ElementType.Array:
return(ArrayTypeSignature.FromReader(header, reader));
case ElementType.Boxed:
return(BoxedTypeSignature.FromReader(header, reader));
case ElementType.ByRef:
return(ByReferenceTypeSignature.FromReader(header, reader));
case ElementType.CModOpt:
return(OptionalModifierSignature.FromReader(header, reader));
case ElementType.CModReqD:
return(RequiredModifierSignature.FromReader(header, reader));
case ElementType.Class:
return(TypeDefOrRefSignature.FromReader(header, reader));
case ElementType.FnPtr:
return(FunctionPointerTypeSignature.FromReader(header, reader));
case ElementType.GenericInst:
return(GenericInstanceTypeSignature.FromReader(header, reader));
case ElementType.MVar:
return(GenericParameterSignature.FromReader(header, reader, GenericParameterType.Method));
case ElementType.Pinned:
return(PinnedTypeSignature.FromReader(header, reader));
case ElementType.Ptr:
return(PointerTypeSignature.FromReader(header, reader));
case ElementType.Sentinel:
return(SentinelTypeSignature.FromReader(header, reader));
case ElementType.SzArray:
return(SzArrayTypeSignature.FromReader(header, reader));
case ElementType.ValueType:
var type = TypeDefOrRefSignature.FromReader(header, reader);
type.IsValueType = true;
return(type);
case ElementType.Var:
return(GenericParameterSignature.FromReader(header, reader, GenericParameterType.Type));
default:
return(MsCorLibTypeSignature.FromElementType(header, elementType));
}
throw new NotSupportedException();
}
private TypeDefOrRefSignature ImportTypeDefOrRefSignature(TypeDefOrRefSignature signature)
{
return new TypeDefOrRefSignature(ImportType(signature.Type))
{
IsValueType = signature.IsValueType
};
}
/// <summary>
/// Determines whether two types are considered equal according to their signature.
/// </summary>
/// <param name="signature1">The first type to compare.</param>
/// <param name="descriptor">The second type to compare.</param>
/// <returns><c>True</c> if the types are considered equal, <c>False</c> otherwise.</returns>
public bool MatchTypes(TypeDefOrRefSignature signature1, ITypeDescriptor descriptor)
{
if (signature1 == null && descriptor == null)
return true;
if (signature1 == null || descriptor == null)
return false;
var signature2 = descriptor as TypeDefOrRefSignature;
if (signature2 != null)
return MatchTypes(signature1.Type, signature2.Type);
var corlibType = descriptor as MsCorLibTypeSignature;
if (corlibType != null)
return MatchTypes(signature1.Type, corlibType.Type);
var typeDefOrRef = descriptor as ITypeDefOrRef;
if (typeDefOrRef != null)
return MatchTypes(signature1.Type, typeDefOrRef);
return false;
}
public void MatchTypeDefOrRefSignature()
{
const string typeNamespace = "SomeNamespace";
const string typeName = "SomeType";
var typeRef1 = new TypeReference(CreateAssemblyReference(), typeNamespace, typeName);
var typeRef2 = new TypeReference(CreateAssemblyReference(), typeNamespace, typeName);
var typeRef3 = new TypeReference(CreateAssemblyReference(), typeNamespace, typeName + "1");
var resolutionScope = CreateAssemblyReference();
resolutionScope.Name += "1";
var typeRef4 = new TypeReference(resolutionScope, typeNamespace, typeName);
ITypeDescriptor type1 = new TypeDefOrRefSignature(typeRef1);
ITypeDescriptor type2 = new TypeDefOrRefSignature(typeRef2);
ITypeDescriptor type3 = new TypeDefOrRefSignature(typeRef3);
ITypeDescriptor type4 = new TypeDefOrRefSignature(typeRef4);
Assert.IsTrue(_comparer.MatchTypes(type1, type2), "The same types did not match each other.");
Assert.IsFalse(_comparer.MatchTypes(type1, type3), "A name change matched the original.");
Assert.IsFalse(_comparer.MatchTypes(type1, type4), "A resolution scope change matched the original.");
}