Ref Object.Property

ModifyPropValue.cs

var demo = new Demo();
demo.FieldValue = 10;
demo.PropValue = 10;

// 修改字段的值
ModifyFieldValue(ref demo.FieldValue, 42);
demo.FieldValue.Dump("Field Value");

// 修改属性的值
// ModifyFieldValue(ref demo.PropValue, 42);
ModifyPropValueWithDelegate(val => demo.PropValue = val, 42);

var method = typeof(Demo).GetProperty("PropValue")!.GetSetMethod()!;
//ModifyPropValueWithReflection(method, demo, 42);

ModifyPropValueWithExpression(d => d.PropValue, demo, 42);

demo.PropValue.Dump("Prop Value");

void ModifyFieldValue<T>(ref T field, T newValue)
{
    field = newValue;
}

void ModifyPropValueWithDelegate<T>(Action<T> func, T newValue)
{
    func.Invoke(newValue);
}

void ModifyPropValueWithReflection<TClass, TProp>(MethodInfo method, TClass target, TProp newValue)
{
    method.Invoke(target, new object?[] { newValue });
}

void ModifyPropValueWithExpression<TClass, TProp>(Expression<Func<TClass, TProp>> expression, TClass target, TProp newValue)
{
    var body = (MemberExpression)expression.Body;
    var prop = (PropertyInfo)body.Member;
    var setMethod = prop.GetSetMethod()!;
    setMethod.Invoke(target, new object?[] { newValue });
}

class Demo
{
    public int PropValue { get; set; }

    public int FieldValue;
}