using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;

namespace NXWMS.Code.Reflections
{
    // <summary>
    /// 反射赋值
    /// </summary>
    public static class ObjectReflection
    {
        public static PropertyInfo[] GetPropertyInfos(Type type)
        {
            return type.GetProperties(BindingFlags.Public | BindingFlags.Instance);
        }
        /// <summary>
        /// 实体属性反射
        /// </summary>
        /// <typeparam name="S">赋值对象</typeparam>
        /// <typeparam name="T">被赋值对象</typeparam>
        /// <param name="s"></param>
        /// <param name="t"></param>
        public static void AutoMapping<S, T>(S s, T t)
        {
            PropertyInfo[] pps = GetPropertyInfos(s.GetType());
            Type target = t.GetType();

            foreach (var pp in pps)
            {
                PropertyInfo targetPP = target.GetProperty(pp.Name);
                object value = pp.GetValue(s, null);

                if (targetPP != null && value != null)
                {
                    targetPP.SetValue(t, value, null);
                }
            }
        }

        /// <summary>
        /// 设置类中属性
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="t"></param>
        /// <param name="fieldName"></param>
        /// <param name="value"></param>
        /// <returns></returns>
        public static string SetFieldValue<T>(T t,string fieldName,object value) where T: class
        {
            try
            {
                var type = t.GetType();
                var propertyInfo = type.GetProperty(fieldName);
                propertyInfo.SetValue(t, value, null);
                return string.Empty;
            }
            catch(Exception ex)
            {
                return ex.Message;
            }
        }

        /// <summary>
        /// 获取类中属性
        /// </summary>
        /// <param name="FieldName"></param>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static string GetFieldValue<T>(T t,string FieldName) where T : class
        {
            try
            {
                Type Ts = t.GetType();
                object o = Ts.GetProperty(FieldName).GetValue(t, null);
                string Value = Convert.ToString(o);
                if (string.IsNullOrEmpty(Value)) return null;
                return Value;
            }
            catch
            {
                return null;
            }
        }
    }
}