using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace efunbox_xyyf_windows.util
{
    public class TextUtils
    {

        //非空判断
        public static bool isEmpty(string str)
        {

            if (str == null || str.Equals("") || str.Length == 0)
            {
                return true;
            }
            else
            {
                return false;
            }



        }





        /**
         * 获取字符串
         * N 字符数量; 默认32位
         * number: 是否包含数字; 默认true
         * Lowercase:是否包含小写英文字母 默认false
         * capital:是否包含大写英文字母 默认true
         * 
         * **/
        public static string GetRandomCharacters(int n = 32, bool Number = true, bool Lowercase = false, bool Capital = true)
        {

            StringBuilder tmp = new StringBuilder();
            Random rand = new Random();
            string characters = (Capital ? "ABCDEFGHIJKLMNOPQRSTUVWXYZ" : null) + (Number ? "0123456789" : null) + (Lowercase ? "abcdefghijklmnopqrstuvwxyz" : null);
            if (characters.Length < 1)
            {
                return (null);
            }
            for (int i = 0; i < n; i++)
            {
                tmp.Append(characters[rand.Next(0, characters.Length)].ToString());
            }
            return (tmp.ToString());



        }


    }
}