XdCxRhDW54/XdCxRhDW.Framework/AppConfigHelper.cs

using Newtonsoft.Json.Linq;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Configuration;
using System.Linq;
using System.Runtime.Remoting;
using System.Text;
using System.Threading.Tasks;

namespace XdCxRhDW.Framework
{
    public static class AppConfigHelper
    {
        public static string Get(string key, string defaultVal = "")
        {
            var str = ConfigurationManager.AppSettings[key];
            if (string.IsNullOrWhiteSpace(str))
                return defaultVal;
            return str.Trim();
        }

        /// <summary>
        /// 获取App.config配置文件中appSettings节点中指定key的value
        /// <para>如果泛型为bool,则{"1","true","True","TRUE"}都会被转换成true,否则转换为false</para>
        /// <para>该方法支持int?、double?等可空类型的转换</para>
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="key"></param>
        /// <param name="defaultVal"></param>
        /// <returns></returns>
        public static T Get<T>(string key, T defaultVal = default)
        {
            var str = ConfigurationManager.AppSettings[key];
            if (string.IsNullOrWhiteSpace(str))
            {
                return defaultVal;
            }
            str = str.Trim();
            bool isNullable = typeof(T).IsGenericType && typeof(T).GetGenericTypeDefinition() == typeof(Nullable<>);
            if (isNullable)
            {
                NullableConverter nullableConverter = new NullableConverter(typeof(T));
                return (T)nullableConverter.ConvertFromString(str);
            }
            else if (typeof(T) == typeof(bool))
            {
                if (str.ToLower().Trim() == "true" || str.ToLower().Trim() == "1")
                {
                    T boolVal = (T)Convert.ChangeType(true, typeof(T));
                    return boolVal;
                }
                else
                {
                    T boolVal = (T)Convert.ChangeType(false, typeof(T));
                    return boolVal;
                }
            }
            else
            {
                T ret = (T)Convert.ChangeType(str, typeof(T));
                return ret;
            }
        }

        /// <summary>
        /// 如果参数小于0则返回0,否则返回原数字
        /// </summary>
        /// <param name="this"></param>
        /// <returns></returns>
        public static int NotLessThanZero(this int @this)
        {
            if (@this >= 0) return @this;
            return 0;
        }

        /// <summary>
        /// 为url字符串添加后缀
        /// </summary>
        /// <param name="this"></param>
        /// <param name="suffix"></param>
        /// <returns></returns>
        public static string AppendUrlSuffix(this string @this, string suffix)
        {
            if (suffix.StartsWith("/"))
                suffix = suffix.Substring(1);
            if (@this.EndsWith("/"))
                return $"{@this}{suffix}";
            else
                return $"{@this}/{suffix}";
        }

    }
}