public FieldMetadataICodeElementAdapter(Field field, TypeDefinition typeDefinition, IList<TypeDescriptor> genericTypes, MetadataReader reader)
: base(typeDefinition, genericTypes, reader)
{
if (field == null)
{
throw new ArgumentNullException("field");
}
this.Field = field;
}
public Field GetFieldProperties(int token)
{
// The Field's name will be stored in this array. The 1024 is a "magical number", seems like a type's name can be maximum this long. The corhlpr.h also defines a suspicious constant like this: #define MAX_CLASSNAME_LENGTH 1024
var fieldName = new char[1024];
var typeDefToken = 0;
// Number of how many characters were filled in the typeName array.
var nameLength = 0;
// Field's flags.
var attr = 0;
// A pointer to the binary metadata signature of the Field.
var sigBlob = new IntPtr(0);
var sigBlobLength = 0;
// A pointer to the relative virtual address of the Field.
var codeRva = 0;
// A constant string value returned by this member.
var value = new IntPtr(0);
var valueLength = 0;
// Get the Field's properties.
var hresult = this.import.GetFieldProps(
token,
ref typeDefToken,
fieldName,
fieldName.Length,
ref nameLength,
ref attr,
ref sigBlob,
ref sigBlobLength,
ref codeRva,
ref value,
ref valueLength);
if (hresult != 0)
{
Marshal.ThrowExceptionForHR(hresult);
}
// supress names "" & "\0";
if (nameLength <= 1)
{
// return null for this, we do not need to know about empty base
return null;
}
// Get the Field's name.
var fullTypeName = new string(fieldName, 0, nameLength - 1);
var sigBlobBytes = new byte[sigBlobLength];
for (var byteIndex = 0; byteIndex < sigBlobLength; byteIndex++)
{
sigBlobBytes[byteIndex] = Marshal.ReadByte(sigBlob, byteIndex);
}
var valueBytes = new byte[valueLength];
for (var byteIndex = 0; byteIndex < valueLength; byteIndex++)
{
valueBytes[byteIndex] = Marshal.ReadByte(value, byteIndex);
}
var fieldProperties = new Field
{
Token = token,
FullName = fullTypeName,
Flags = (CorFieldAttr)attr,
SigBlob = sigBlobBytes,
CodeRva = codeRva,
Value = valueBytes
};
return fieldProperties;
}
