把新建的对象所有属性变成默认值

日常编码的过程中，我们经常能碰到一些小操作，有时候就是想节(tōu)约(gè)时(lǎn)间(er)，所以写好工具方法方便直接调用

    public static class WipeNullHelper
    {
        /// <summary>
        /// 把对象里的null变成相应类型的默认值
        /// </summary>
        /// <param name="entity">对象实体</param>
        /// <returns></returns>
        public static T WipeNull<T>(T entity)
        {
            System.Reflection.PropertyInfo[] ps = entity.GetType().GetProperties();
            Type type = entity.GetType();
            foreach (PropertyInfo propertie in ps)
            {
                if (propertie.PropertyType == typeof(string))
                {
                    PropertyInfo propertyInfo = type.GetProperty(propertie.Name);
                    if (propertyInfo.GetValue(entity, null) == null)
                    {
                        propertyInfo.SetValue(entity, "", null);
                    }
                }
                else if (propertie.PropertyType == typeof(Int32))
                {
                    PropertyInfo propertyInfo = type.GetProperty(propertie.Name);
                    if (propertyInfo.GetValue(entity, null) == null)
                    {
                        propertyInfo.SetValue(entity, 0, null);
                    }
                }
                else if (propertie.PropertyType == typeof(Nullable<int>))
                {
                    PropertyInfo propertyInfo = type.GetProperty(propertie.Name);
                    if (propertyInfo.GetValue(entity, null) == null)
                    {
                        propertyInfo.SetValue(entity, 0, null);
                    }
                }
                else if (propertie.PropertyType == typeof(decimal))
                {
                    PropertyInfo propertyInfo = type.GetProperty(propertie.Name);
                    if (propertyInfo.GetValue(entity, null) == null)
                    {
                        propertyInfo.SetValue(entity, Convert.ToDecimal(0.0), null);
                    }
                }
                else if (propertie.PropertyType == typeof(Nullable<decimal>))
                {
                    PropertyInfo propertyInfo = type.GetProperty(propertie.Name);
                    if (propertyInfo.GetValue(entity, null) == null)
                    {
                        propertyInfo.SetValue(entity, Convert.ToDecimal(0.0), null);
                    }
                }
            }
            return entity;
        }

    }