DataTable与List互换

 public static class List2DataTable
    {
        #region "Convert Generic List to DataTable"
        /// <summary>
        /// Convert a List{T} to a DataTable.
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="items"></param>
        /// <returns></returns>
        public static DataTable ConvertToDataTable<T>(this List<T> items)
        {
            var tb = new DataTable(typeof(T).Name);

            PropertyInfo[] props = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance);

            foreach (PropertyInfo prop in props)
            {
                Type t = GetCoreType(prop.PropertyType);
                tb.Columns.Add(prop.Name, t);
            }

            foreach (T item in items)
            {
                var values = new object[props.Length];

                for (int i = 0; i < props.Length; i++)
                {
                    values[i] = props[i].GetValue(item, null);
                }
                tb.Rows.Add(values);
            }
            return tb;
        }

        /// <summary>
        /// Determine of specified type is nullable
        /// </summary>
        /// <param name="t"></param>
        /// <returns></returns>
        public static bool IsNullable(Type t)
        {
            return !t.IsValueType || (t.IsGenericType && t.GetGenericTypeDefinition() == typeof(Nullable<>));
        }

        /// <summary>
        /// Return underlying type if type is Nullable otherwise return the type.
        /// </summary>
        /// <param name="t"></param>
        /// <returns></returns>
        public static Type GetCoreType(Type t)
        {
            if (t != null && IsNullable(t))
            {
                if (!t.IsValueType)
                {
                    return t;
                }
                else
                {
                    return Nullable.GetUnderlyingType(t);
                }
            }
            else
            {
                return t;
            }
        }
        #endregion
    }