有一个有一个属性的类:
public class BaseClass
{
public virtual string Property1 { get; set; }
}
现在我使用一些方法覆盖创建一个派生类型:
[Test]
public void name ()
{
var assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly (new AssemblyName ("Test"), AssemblyBuilderAccess.RunAndSave);
var moduleBuilder = assemblyBuilder.DefineDynamicModule ("Test.dll");
var derivedBuilder = moduleBuilder.DefineType ("DerivedClass", TypeAttributes.Public, typeof (BaseClass));
const MethodAttributes methodAttributes = MethodAttributes.Private | MethodAttributes.Virtual | MethodAttributes.SpecialName | MethodAttributes.NewSlot;
var getterOverride = derivedBuilder.DefineMethod (
"get_Property1",
methodAttributes,
typeof (string),
Type.EmptyTypes);
var getterILGenerator = getterOverride.GetILGenerator();
getterILGenerator.Emit (OpCodes.Ldnull);
getterILGenerator.Emit (OpCodes.Ret);
derivedBuilder.DefineMethodOverride (getterOverride, typeof (BaseClass).GetMethod ("get_Property1"));
var setterOverride = derivedBuilder.DefineMethod (
"set_Property1",
methodAttributes,
typeof (void),
new[] { typeof (string) });
var setterILGenerator = setterOverride.GetILGenerator ();
setterILGenerator.Emit (OpCodes.Ret);
derivedBuilder.DefineMethodOverride (setterOverride, typeof (BaseClass).GetMethod ("set_Property1"));
var derivedType = derivedBuilder.CreateType();
var props = derivedType.GetProperties (BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
assemblyBuilder.Save ("Test.dll");
Assert.That (props, Has.Length.EqualTo (1));
}
生成的类型不再包含该属性。奇怪的是,如果您为至少一个方法定义将methodAttributes
更改为MethodAttributes.Public
,则该属性会再次出现。
好像是个错误?
编辑: peverify不会出错。
编辑(Fabian Schmied的重要评论)
ECMA-335分区II,10.3.3:“如果类型通过MethodImpl覆盖继承的方法,它可以扩大或缩小该方法的可访问性。”
答案 0 :(得分:4)
由于specs(ECMA-335,II.10.3.3)明确允许通过MethodImpl缩小被覆盖的方法的可见性(“显式覆盖”,由Reflection.Emit通过TypeBuilder.DefineMethodOverride表示) ,我相信这确实是Reflection实现中的一个错误,应该通过Microsoft Connect报告。