public void If_Else()
{
DynamicMethod method = new DynamicMethod("temp", typeof(int), Type.EmptyTypes);
MethodGenerator g = new MethodGenerator(method);
var count = g.Declare <int>();
g.If(() =>
{
g.Load(true);
return(LogicOperator.IsTrue);
}, () =>
{
g.Assign(count, () =>
{
g.Load(1);
});
}, () =>
{
g.Assign(count, () =>
{
g.Load(2);
});
});
g.Load(count);
g.Return();
int result = (int)method.Invoke(null, null);
Assert.AreEqual(1, result);
}
public override void GenerateDeserializeIL(MethodGenerator g)
{
SetMember(g, () =>
{
var count = g.Declare <int>();
g.Assign(count, () =>
{
SerializationMethodHelper.ReadLength(g, this.DTOMemberName);//读取数量
});
var list = g.Declare(this.TargetType);
g.If(() =>
{
g.Load(count);
g.Load(0);
return(LogicOperator.LessThan);
}, () =>
{
//数量小于1
//list = new List<T>();
var elementType = this.TargetType.ResolveElementType();
g.Assign(list, () =>
{
g.NewObject(this.TargetType);
});
}, () =>
{
//list = new List<T>();
g.Assign(list, () =>
{
g.NewObject(this.TargetType);
});
var elementType = this.TargetType.ResolveElementType();
g.For(count, (index) =>
{
var item = g.Declare(elementType);
g.Assign(item, () =>
{
SerializationMethodHelper.ReadElement(g, this.DTOMemberName, elementType, index);
});
g.Load(list);
g.Load(item);
g.Call(this.TargetType.ResolveMethod("Add", elementType));
});
});
g.Load(list);
});
}
private static PropertyValueMethod GenerateGetPropertyValueMethod <T>(Type objectType, string propertyName)
{
DynamicMethod method = new DynamicMethod(string.Format("GetPropertyValue_{0}", Guid.NewGuid().ToString("n"))
, typeof(T)
, new Type[] { typeof(object) }
, true);
MethodGenerator g = new MethodGenerator(method);
var result = g.Declare <T>("result");
g.Assign(result, () =>
{
g.LoadParameter(0);
g.Cast(objectType);
g.LoadMember(propertyName);
});
g.LoadVariable("result");
g.Return();
var invoke = method.CreateDelegate(typeof(Func <object, T>));
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 For()
{
DynamicMethod method = new DynamicMethod("temp", typeof(int), new Type[] { typeof(List <int>) });
MethodGenerator g = new MethodGenerator(method);
IVariable array = g.Declare <List <int> >();
g.Assign(array, () =>
{
g.LoadParameter(0);
});
var count = g.Declare <int>();
var number = g.Declare(0);
g.Assign(count, () => {
g.LoadParameter(0);
g.LoadMember("Count");
});
g.For(count, (index) =>
{
g.Assign(number, () =>
{
g.LoadParameter(0);
g.Load(index);
g.Call(typeof(List <int>).ResolveMethod("get_Item", typeof(int)));
g.Load(number);
g.Add <int>();
});
});
g.Load(number);
g.Return();
List <int> list = new List <int> {
1, 2, 3, 4, 5
};
var result = (int)method.Invoke(null, new object[] { list });
Assert.AreEqual(15, result);
}
/// <summary>
/// 声明强类型的instance变量留待后续代码使用，避免频繁类型转换
/// </summary>
private static void DeclareInstance(MethodGenerator g, TypeSerializationInfo typeInfo)
{
//TypeClassName instance = (TypeClassName)instance;
var instance = g.Declare(typeInfo.ClassType, SerializationArgs.InstanceName);
g.Assign(instance, () =>
{
g.LoadParameter(SerializationArgs.InstanceIndex);
g.UnboxAny(typeInfo.ClassType);
});
}
public void SetMember(MethodGenerator g, Action loadValue)
{
if (this.IsClassInfo)
{
g.AssignVariable(SerializationArgs.InstanceName, loadValue);
}
else
{
LoadOwner(g);
if (this.IsFieldInfo)
{
g.Assign(this.FieldInfo, loadValue);
}
else
{
g.Assign(this.PropertyInfo, loadValue);
}
}
}
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));
}
public override void GenerateDeserializeIL(MethodGenerator g)
{
SetMember(g, () =>
{
var array = g.Declare(this.TargetType);
if (this.MemberAttribute.IsBlob)
{
g.Assign(array, () =>
{
SerializationMethodHelper.ReadBlob(g, this.DTOMemberName);//读取数量
});
}
else
{
var length = g.Declare <int>();
g.Assign(length, () =>
{
SerializationMethodHelper.ReadLength(g, this.DTOMemberName);//读取数量
});
g.If(() =>
{
g.Load(length);
g.Load(0);
return(LogicOperator.LessThan);
}, () =>
{
//数量小于1
//array = new array[];
var elementType = this.TargetType.ResolveElementType();
g.Assign(array, () =>
{
g.NewArray(elementType, () =>
{
g.Load(length);
});
});
}, () =>
{
var elementType = this.TargetType.ResolveElementType();
//int[] = new int[c];
g.Assign(array, () =>
{
g.NewArray(elementType, () =>
{
g.Load(length);
});
});
g.For(length, (index) =>
{
var item = g.Declare(elementType);
g.Assign(item, () =>
{
SerializationMethodHelper.ReadElement(g, this.DTOMemberName, elementType, index);
});
g.StoreElement(array, index, item);
});
});
}
g.Load(array);
});
}