.Net中自动生成Model字段修改日志内容

来源：互联网发布：梦幻西游内存数据编辑：程序博客网时间：2024/06/03 14:32
直接上代码，传入新旧两个Model类
字段说明，要加display标签：
这里写图片描述
代码如下：
    public static class EntityExtension    {        public static HashSet<Type> PrimitiveTypes = null;        static EntityExtension()        {            PrimitiveTypes = new HashSet<Type>()                {                    typeof(String),                    typeof(Byte[]),                    typeof(Byte),                    typeof(Int16),                    typeof(Int32),                    typeof(Int64),                    typeof(Single),                    typeof(Double),                    typeof(Decimal),                    typeof(DateTime),                    typeof(Guid),                    typeof(Boolean),                    typeof(TimeSpan),                    typeof(Byte?),                    typeof(Int16?),                    typeof(Int32?),                    typeof(Int64?),                    typeof(Single?),                    typeof(Double?),                    typeof(Decimal?),                    typeof(DateTime?),                    typeof(Guid?),                    typeof(Boolean?),                    typeof(TimeSpan?)                };        }        public static string GetChangedFields<T>(this T newEntity, T oldEntity) where T : class        {            StringBuilder updatedFields = new StringBuilder();            Type entityType = typeof(T);            PropertyInfo[] properties = entityType.GetProperties().Where(o => o.CanWrite && PrimitiveTypes.Contains(o.PropertyType) && !o.GetCustomAttributes(false).OfType<NotMappedAttribute>().Any()).ToArray();            foreach (var p in properties)            {                if (p.Name == "ModifiedDate" || p.Name == "ModifiedByName" || p.Name == "ModifiedById") continue;                object oldValue = p.GetValue(oldEntity, null);                object newValue = p.GetValue(newEntity, null);                if ((oldValue == null && newValue == null))                {                    continue;                }                else if (oldValue == null && newValue != null || oldValue != null && newValue == null || !Eq(p.PropertyType, oldValue, newValue))                {                    string fieldName;                    var display = p.GetCustomAttribute<DisplayAttribute>(false);                    fieldName = display != null ? display.Name : p.Name;                    updatedFields.AppendFormat("{0}:{1}->{2}; ", fieldName, oldValue ?? "NULL", newValue ?? "NULL");                }            }            return updatedFields.ToString();        }        private static bool Eq(Type propertyType, object oldValue, object newValue)        {            if (propertyType == typeof(Decimal) || propertyType == typeof(Decimal?))            {                return decimal.Parse(oldValue.ToString()) == decimal.Parse(newValue.ToString());            }            else            {                return string.Equals(oldValue.ToString(), newValue.ToString());            }        }        /// <summary>        ///         /// </summary>        /// <typeparam name="T"></typeparam>        /// <param name="newEntity"></param>        /// <param name="oldEntity"></param>        /// <returns></returns>        public static List<ValueModifiedModel> GetChangedFieldsExtent<T>(this T newEntity, T oldEntity) where T : class        {            List<ValueModifiedModel> valueModifiedList = new List<ValueModifiedModel>();            Type entityType = typeof(T);            PropertyInfo[] properties = entityType.GetProperties().Where(o => o.CanWrite && PrimitiveTypes.Contains(o.PropertyType) && !o.GetCustomAttributes(false).OfType<NotMappedAttribute>().Any()).ToArray();            foreach (var p in properties)            {                if (ignoreColumnList.Contains(p.Name))                    continue;                object oldValue = p.GetValue(oldEntity, null);                object newValue = p.GetValue(newEntity, null);                if ((oldValue == null && newValue == null))                {                    continue;                }                else if (oldValue == null && newValue != null || oldValue != null && newValue == null || !Eq(p.PropertyType, oldValue, newValue))                {                    valueModifiedList.Add(new ValueModifiedModel()                    {                        ColumnName = p.Name,                        ColumnChineseName = p.GetPropertyDisplayName(),                        ChangeBefore = oldValue ?? "NULL",                        ChangeAfter = newValue ?? "NULL"                    }                    );                }            }            return valueModifiedList;        }        /// <summary>        /// /        /// </summary>        /// <typeparam name="T"></typeparam>        /// <param name="pTargetObjSrc"></param>        /// <param name="pTargetObjDest"></param>        public static void EntityToEntity<T>(T pTargetObjSrc, T pTargetObjDest) where T : class        {            try            {                foreach (var mItem in typeof(T).GetProperties())                {                    mItem.SetValue(pTargetObjDest, mItem.GetValue(pTargetObjSrc, new object[] { }), null);                }            }            catch (NullReferenceException NullEx)            {                throw NullEx;            }            catch (Exception Ex)            {                throw Ex;            }        }        /// <summary>        /// 忽略的列名列表        /// </summary>        public static List<string> ignoreColumnList = new List<string>()        {        };    }
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