Generic/GenericEx.cs

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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml;
using System.Xml.Serialization;

namespace Stardance.Generic
{
    public static class GenericEx
    {
        /// <summary>
        /// 如果当前值不为空则调用委托，否则返回默认值
        /// if the object is null, returns default(TResult)
        /// var username = HttpContext.Current.IfNotNull( ctx => ctx.User.IfNotNull( user => user.Identity.IfNotNull( iden => iden.Name ) ) );
        /// </summary>
        public static TResult IfNotNull<T, TResult>(this T target, Func<T, TResult> getValue)
        {
            if (target != null)
                return getValue(target);
            else
                return default(TResult);
        }

        #region XML 解析

        private static readonly Dictionary<RuntimeTypeHandle, XmlSerializer> ms_serializers = new Dictionary<RuntimeTypeHandle, XmlSerializer>();

        /// <summary>
        ///   Serialize object to xml string by <see cref = "XmlSerializer" />
        /// </summary>
        /// <typeparam name = "T"></typeparam>
        /// <param name = "value"></param>
        /// <returns></returns>
        public static string ToXml<T>(this T value)
            where T : new()
        {
            var _serializer = GetValue(typeof(T));
            using (var _stream = new MemoryStream())
            {
                using (var _writer = new XmlTextWriter(_stream, new UTF8Encoding()))
                {
                    _serializer.Serialize(_writer, value);
                    return Encoding.UTF8.GetString(_stream.ToArray());
                }
            }
        }

        /// <summary>
        ///   Deserialize object from string
        /// </summary>
        /// <typeparam name = "T">Type of deserialized object</typeparam>
        /// <param name = "srcString">Xml source</param>
        /// <returns></returns>
        public static T FromXml<T>(this string srcString)
            where T : new()
        {
            var _serializer = GetValue(typeof(T));