public DynamicParameterInstance EnableParameter(
[NotNull] DynamicParameterDescriptor descriptor)
{
if (descriptor is null)
{
throw new ArgumentNullException(nameof(descriptor));
}
var instance = new DynamicParameterInstance(this, descriptor);
this._enabledParameters.Add(descriptor.ParameterName, instance);
return(instance);
}
internal DynamicParameterInstance(
[NotNull] DynamicParameterContext context,
[NotNull] DynamicParameterDescriptor descriptor)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (descriptor is null)
{
throw new ArgumentNullException(nameof(descriptor));
}
this.Context = context;
this.ParameterDescriptor = descriptor;
}
private static void AddParameter(
[NotNull] TypeBuilder typeBuilder,
[NotNull] DynamicParameterDescriptor descriptor,
[NotNull] FieldInfo contextField)
{
string parameterName = descriptor.ParameterName;
var parameterType = descriptor.ParameterType;
var propertyBuilder = typeBuilder.DefineProperty(
parameterName,
PropertyAttributes.None,
parameterType,
Type.EmptyTypes);
SetParameterAttributes(propertyBuilder, descriptor, true);
const MethodAttributes accessorAttributes =
MethodAttributes.Public |
MethodAttributes.PrivateScope |
MethodAttributes.HideBySig |
MethodAttributes.SpecialName;
var getterBuilder = typeBuilder.DefineMethod(
"get_" + parameterName,
accessorAttributes,
parameterType,
Type.EmptyTypes);
var getterGenerator = getterBuilder.GetILGenerator();
EmitLoadMember(getterGenerator, descriptor, contextField);
var setterBuilder = typeBuilder.DefineMethod(
"set_" + parameterName,
accessorAttributes,
typeof(void),
new[] { parameterType });
var setterGenerator = setterBuilder.GetILGenerator();
EmitStoreMember(setterGenerator, descriptor, contextField);
propertyBuilder.SetGetMethod(getterBuilder);
propertyBuilder.SetSetMethod(setterBuilder);
}
public static DynamicParameterInstance EnableDynamicParameter <TCmdlet>(
[NotNull] this TCmdlet cmdlet,
[NotNull] DynamicParameterDescriptor parameterDescriptor)
where TCmdlet : Cmdlet
{
if (cmdlet is null)
{
throw new ArgumentNullException(nameof(cmdlet));
}
if (parameterDescriptor is null)
{
throw new ArgumentNullException(nameof(parameterDescriptor));
}
var context = DynamicParameterContext.GetContext(cmdlet);
var instance = context.EnableParameter(parameterDescriptor);
return(instance);
}
private static void SetParameterAttributes(
[NotNull] PropertyBuilder propertyBuilder,
[NotNull] DynamicParameterDescriptor parameterDescriptor,
bool checkAttributeTarget)
{
foreach (var attribute in parameterDescriptor.Attributes)
{
if (checkAttributeTarget)
{
bool valid = IsAttributeValidOnProperty(attribute);
if (!valid)
{
continue;
}
}
var attributeBuilder = ConvertToCustomAttributeBuilder(attribute);
propertyBuilder.SetCustomAttribute(attributeBuilder);
}
}
private static void EmitLoadMember(
[NotNull] ILGenerator generator,
[NotNull] DynamicParameterDescriptor descriptor,
[NotNull] FieldInfo contextField)
{
var method = typeof(DynamicParameterContext).GetMethod(
nameof(DynamicParameterContext.GetParameterValue),
BindingFlags.Instance | BindingFlags.Public | BindingFlags.DeclaredOnly);
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldfld, contextField);
generator.Emit(OpCodes.Ldstr, descriptor.ParameterName);
generator.EmitCall(OpCodes.Call, method, Type.EmptyTypes);
if (descriptor.ParameterType.IsValueType)
{
generator.Emit(OpCodes.Unbox_Any, descriptor.ParameterType);
}
generator.Emit(OpCodes.Ret);
}
public void SetValue(
IDynamicParameterContext context,
DynamicParameterDescriptor descriptor,
ref object value)
{
}
