public void CreateRequiredModifierField()
{
// set up temp assembly.
var assembly = Utilities.CreateTempNetAssembly();
var typeSystem = assembly.NetDirectory.MetadataHeader.TypeSystem;
var tableStream = assembly.NetDirectory.MetadataHeader.GetStream<TableStream>();
var fieldTable = tableStream.GetTable<FieldDefinition>();
var importer = new ReferenceImporter(tableStream);
// create field.
var typeSignature = new RequiredModifierSignature(importer.ImportType(typeof(IsVolatile)), typeSystem.Int32);
var field = new FieldDefinition(FieldName, FieldAttributes.Public | FieldAttributes.Static,
new FieldSignature(typeSignature));
fieldTable.Add(field);
// build and validate.
assembly = Utilities.RebuildNetAssembly(assembly);
fieldTable = assembly.NetDirectory.MetadataHeader.GetStream<TableStream>().GetTable<FieldDefinition>();
field = fieldTable.First(x => x.Name == FieldName);
Assert.IsInstanceOfType(field.Signature.FieldType, typeof(RequiredModifierSignature));
var newTypeSignature = (RequiredModifierSignature)field.Signature.FieldType;
Utilities.ValidateType(typeSignature.ModifierType, newTypeSignature.ModifierType);
Utilities.ValidateType(typeSignature.BaseType, newTypeSignature.BaseType);
}