private static PropertyValueMethod GenerateGetPropertyValueMethod(Type objectType, string propertyName)
{
DynamicMethod method = new DynamicMethod(string.Format("GetPropertyValue_{0}", Guid.NewGuid().ToString("n"))
, typeof(object)
, new Type[] { typeof(object) }
, true);
MethodGenerator g = new MethodGenerator(method);
var result = g.Declare <object>("result");
g.Assign(result, () =>
{
g.LoadParameter(0);
g.Cast(objectType);
g.LoadMember(propertyName);
g.Cast(typeof(object));
});
g.LoadVariable("result");
g.Return();
var invoke = method.CreateDelegate(typeof(Func <object, object>));
return(new PropertyValueMethod(propertyName, invoke));
}
private static PropertyValueMethod GenerateSetPropertyValueMethod(Type objectType, string propertyName)
{
var propertyInfo = objectType.ResolveProperty(propertyName);
var propertyType = propertyInfo.PropertyType;
DynamicMethod method = new DynamicMethod(string.Format("SetPropertyValue_{0}", Guid.NewGuid().ToString("n"))
, null
, new Type[] { typeof(object), typeof(object) } //obj value
, true);
MethodGenerator g = new MethodGenerator(method);
g.LoadParameter(0);
g.Cast(objectType);
g.Assign(propertyName, () =>
{
g.LoadParameter(1);
g.Cast(propertyType);
});
g.Return();
var invoke = method.CreateDelegate(typeof(Action <object, object>));
return(new PropertyValueMethod(propertyName, invoke));
}
private static CreateInstanceMethod GenerateCreateInstanceMethod(ConstructorInfo constructor)
{
var objectType = constructor.DeclaringType;
DynamicMethod method = new DynamicMethod(string.Format("CreateInstanceByConstructor_{0}", Guid.NewGuid().ToString("n"))
, typeof(object)
, new Type[] { typeof(object[]) }
, true);
MethodGenerator g = new MethodGenerator(method);
//以下代码把数组参数转成，new T(arg0,arg1)的形式
var result = g.Declare(objectType, "result");
var objs = g.Declare <object[]>();
g.Assign(objs, () =>
{
g.LoadParameter(0);
});
g.Assign(result, () =>
{
g.NewObject(constructor, () =>
{
var index = g.Declare <int>();
var prms = constructor.GetParameters();
for (var i = 0; i < prms.Length; i++)
{
g.Assign(index, () =>
{
g.Load(i);
});
g.LoadElement(objs, index);
g.Cast(prms[i].ParameterType);
}
});
});
g.LoadVariable("result");
g.Cast(typeof(object));
g.Return();
var invoke = method.CreateDelegate(typeof(Func <object[], object>));
return(new CreateInstanceMethod(invoke));
}
public void IntToObject()
{
DynamicMethod method = new DynamicMethod("temp", typeof(object), Type.EmptyTypes);
MethodGenerator g = new MethodGenerator(method);
g.Load(1);
g.Cast(typeof(object));
g.Return();
object result = (object)method.Invoke(null, new object[] { });
Assert.AreEqual(1, result);
}
private static CreateInstanceMethod GenerateCreateInstanceMethod(Type objectType)
{
DynamicMethod method = new DynamicMethod(string.Format("CreateInstance_{0}", Guid.NewGuid().ToString("n"))
, typeof(object)
, Array.Empty <Type>()
, true);
MethodGenerator g = new MethodGenerator(method);
var result = g.Declare <object>("result");
g.Assign(result, () =>
{
g.NewObject(objectType);
g.Cast(typeof(object));
});
g.LoadVariable("result");
g.Return();
var invoke = method.CreateDelegate(typeof(Func <object>));
return(new CreateInstanceMethod(invoke));
}
