Update实体时如何避免逐一赋值

使用以下方法可以实现避免Update实体时避免逐一赋值的麻烦。

代码：

public static class ReflectionExtensions
    {
        public static void CopyPropertiesFrom(this object destObject, object sourceObject)
        {
            if (null == destObject)
                throw new ArgumentNullException("destObject");
            if (null == sourceObject)
                throw new ArgumentNullException("sourceObject");

            Type destObjectType = destObject.GetType();
            foreach (PropertyInfo sourcePi in sourceObject.GetType().GetProperties(BindingFlags.Instance | BindingFlags.Public))
            {
                PropertyInfo destPi = destObjectType.GetProperty(sourcePi.Name);
                if (null != destPi && null != destPi.SetMethod)
                {
                    object sourcePropertyValue = sourcePi.GetValue(sourceObject);

                    destPi.SetValue(destObject, sourcePropertyValue);
                }
            }
        }

    }

调用方法：

using (DemoDBEntities1 ctx = new DemoDBEntities1())
            {
                var query = (from q in ctx.Cities
                             select q).FirstOrDefault();
                City city = new City();
                
                city.Id = query.Id;
                city.StateID = 101;
                city.City1 = "test";
                
                query.CopyPropertiesFrom(city);
                int result = ctx.SaveChanges();
            }

希望能帮助到更多的人。