using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Bowin.Common.Utility;

namespace Bowin.Common.Linq
{
    public static class stringExtensions
    {
        /// <summary>
        /// 把字符串转成对应该类型(自动去左右空格)
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="text"></param>
        /// <returns></returns>
        public static Nullable<T> ConvertLinqData<T>(this string text) where T : struct
        {
            text = text.Trim();
            var convertvalue = new Nullable<T>();

            if (text.Length > 0 || typeof(T) == typeof(string))
            {
                convertvalue = new Nullable<T>((T)Convert.ChangeType(text, typeof(T)));
            }

            return convertvalue;
        }

        public static object ParseToType(this string text, Type targetType)
        {
            text = text.Trim();
            var valueTargetType = targetType;
            if (valueTargetType.Name.StartsWith("Nullable")) valueTargetType = targetType.GetGenericArguments()[0];
            var converterType = typeof(WebExtensions);
            var converter = converterType.GetMethod("ParseTo", System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.Public);
            converter = converter.MakeGenericMethod(valueTargetType);

            return converter.Invoke(null, new object[] { text });
        }
    }
}