protected Type CreateProxyType(Type type)
{
if (type.GetConstructor(new Type[0]) == null)
{
throw new PatchProxyTypeException($"Type {type} doesn't have an empty constructor.");
}
RuntimeTypeBuilder proxyBuilder = new RuntimeTypeBuilder($"{{Guid.NewGuid()}}.{type.FullName}Patch", type);
FieldBuilder modified = proxyBuilder.DefineField("_modified", typeof(HashSet <string>), FieldAttributes.Private);
var modifiedField = Field(proxyBuilder.This, modified);
foreach (PropertyInfo propInfo in type.GetRuntimeProperties())
{
if (propInfo.CanRead && propInfo.CanWrite && propInfo.GetSetMethod().IsVirtual)
{
ParameterExpression valueExpr = Parameter(propInfo.PropertyType, "value");
var baseGet = Call(proxyBuilder.Base, propInfo.GetGetMethod());
proxyBuilder.OverrideMethod(propInfo.GetSetMethod(),
new[] { valueExpr },
If(NotEqual(baseGet, valueExpr),
Then(
If(IsNull(modifiedField),
Assign(modifiedField, New(typeof(HashSet <string>)))
),
Call("Add", modifiedField, Constant(propInfo.Name)),
Call(proxyBuilder.Base, propInfo.SetMethod, valueExpr)
)
)
);
}
}
proxyBuilder.DefineMethod("Reset", null,
Block(
If(IsNotNull(modifiedField),
Call("Clear", modifiedField)
)
)
);
var propNameParam = Parameter(typeof(string), "propName");
proxyBuilder.DefineMethod("IsSet",
new[] { propNameParam },
Block(
Variable("result", Constant(false), out Expression result),
If(IsNotNull(modifiedField),
Assign(result, Call("Contains", modifiedField, propNameParam))
),
Result(result)
)
);
proxyBuilder.AutoImplementInterface(typeof(IPatch));
return(proxyBuilder.Create());
}
public void auto_implement_interface()
{
RuntimeTypeBuilder typeBuilder = new RuntimeTypeBuilder("AutoImplenetInterface", typeof(BasePropertyClass));
typeBuilder.AutoImplementInterface(typeof(ITextProperty));
Type newType = typeBuilder.Create();
ITextProperty newInstance = (ITextProperty)Activator.CreateInstance(newType);
newInstance.Text = "test text";
Assert.Equal("test text", newInstance.Text);
}
