/// <summary>
/// Writes the named argument to the provided output stream.
/// </summary>
/// <param name="writer">The output stream.</param>
/// <param name="provider">The object to use for obtaining metadata tokens for members in the tables stream.</param>
public void Write(IBinaryStreamWriter writer, ITypeCodedIndexProvider provider)
{
writer.WriteByte((byte)MemberType);
TypeSignature.WriteFieldOrPropType(writer, ArgumentType);
writer.WriteSerString(MemberName);
Argument.Write(writer, provider);
}
/// <summary>
/// Writes the named argument to the provided output stream.
/// </summary>
public void Write(BlobSerializationContext context)
{
var writer = context.Writer;
writer.WriteByte((byte)MemberType);
TypeSignature.WriteFieldOrPropType(writer, ArgumentType);
writer.WriteSerString(MemberName);
Argument.Write(context);
}
private void WriteValue(IBinaryStreamWriter writer, TypeSignature argumentType, ITypeCodedIndexProvider provider, object value)
{
if (argumentType.IsTypeOf("System", "Type"))
{
writer.WriteSerString(TypeNameBuilder.GetAssemblyQualifiedName((TypeSignature)value));
return;
}
switch (argumentType.ElementType)
{
case ElementType.Boolean:
writer.WriteByte((byte)((bool)value ? 1 : 0));
break;
case ElementType.Char:
writer.WriteUInt16((char)value);
break;
case ElementType.I1:
writer.WriteSByte((sbyte)value);
break;
case ElementType.U1:
writer.WriteByte((byte)value);
break;
case ElementType.I2:
writer.WriteInt16((short)value);
break;
case ElementType.U2:
writer.WriteUInt16((ushort)value);
break;
case ElementType.I4:
writer.WriteInt32((int)value);
break;
case ElementType.U4:
writer.WriteUInt32((uint)value);
break;
case ElementType.I8:
writer.WriteInt64((long)value);
break;
case ElementType.U8:
writer.WriteUInt64((ulong)value);
break;
case ElementType.R4:
writer.WriteSingle((float)value);
break;
case ElementType.R8:
writer.WriteDouble((double)value);
break;
case ElementType.String:
writer.WriteSerString(value as string);
break;
case ElementType.Object:
var valueType = value.GetType();
var innerTypeSig = argumentType.Module.CorLibTypeFactory.FromName(valueType.Namespace, valueType.Name);
TypeSignature.WriteFieldOrPropType(writer, innerTypeSig);
WriteValue(writer, innerTypeSig, provider, value);
break;
case ElementType.Class:
case ElementType.Enum:
case ElementType.ValueType:
var enumTypeDef = argumentType.Resolve();
if (enumTypeDef != null && enumTypeDef.IsEnum)
{
WriteValue(writer, enumTypeDef.GetEnumUnderlyingType(), provider, Value);
}
else
{
throw new NotImplementedException();
}
break;
default:
throw new ArgumentOutOfRangeException();
}
}
private void WriteElement(TypeSignature argumentType, object element)
{
var writer = _context.Writer;
if (argumentType.IsTypeOf("System", "Type"))
{
writer.WriteSerString(TypeNameBuilder.GetAssemblyQualifiedName((TypeSignature)element));
return;
}
switch (argumentType.ElementType)
{
case ElementType.Boolean:
writer.WriteByte((byte)((bool)element ? 1 : 0));
break;
case ElementType.Char:
writer.WriteUInt16((char)element);
break;
case ElementType.I1:
writer.WriteSByte((sbyte)element);
break;
case ElementType.U1:
writer.WriteByte((byte)element);
break;
case ElementType.I2:
writer.WriteInt16((short)element);
break;
case ElementType.U2:
writer.WriteUInt16((ushort)element);
break;
case ElementType.I4:
writer.WriteInt32((int)element);
break;
case ElementType.U4:
writer.WriteUInt32((uint)element);
break;
case ElementType.I8:
writer.WriteInt64((long)element);
break;
case ElementType.U8:
writer.WriteUInt64((ulong)element);
break;
case ElementType.R4:
writer.WriteSingle((float)element);
break;
case ElementType.R8:
writer.WriteDouble((double)element);
break;
case ElementType.String:
writer.WriteSerString(element as string);
break;
case ElementType.Object:
TypeSignature innerTypeSig;
object value;
if (element is null)
{
// Most efficient way to store "null" is writing null as a string (two bytes).
innerTypeSig = argumentType.Module.CorLibTypeFactory.String;
value = null;
}
else if (element is BoxedArgument boxedArgument)
{
// Write the boxed argument.
innerTypeSig = boxedArgument.Type;
value = boxedArgument.Value;
}
else
{
_context.DiagnosticBag.RegisterException(new NotSupportedException(
$"Object elements in a custom attribute signature should be either 'null' or an instance of {nameof(BoxedArgument)}."));
// Write null as a recovery.
innerTypeSig = argumentType.Module.CorLibTypeFactory.String;
value = null;
}
TypeSignature.WriteFieldOrPropType(writer, innerTypeSig);
WriteElement(innerTypeSig, value);
break;
case ElementType.SzArray:
WriteArrayElement(
(SzArrayTypeSignature)argumentType,
element as IList <object> ?? new object[0],
element == null);
break;
case ElementType.Class:
case ElementType.Enum:
case ElementType.ValueType:
WriteEnumValue(argumentType, element);
break;
default:
UnsupportedArgumentType(argumentType);
break;
}
}