/// <summary>
/// 生成随机数。
/// </summary>
/// <param name="verificationCodeCategory"></param>
/// <param name="length"></param>
/// <returns>随机数。</returns>
public static string GetRandString(VerificationCodeCategory verificationCodeCategory, int length = 4)
{
StringBuilder sb = new StringBuilder();
var numString = "0123456789";
var lowerString = "abcdefghijklmnopqrstuvwxyz";
var upperString = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
var baseStr = string.Empty;
if (verificationCodeCategory.HasFlag(VerificationCodeCategory.Number))
{
baseStr += numString;
}
if (verificationCodeCategory.HasFlag(VerificationCodeCategory.Lowercase))
{
baseStr += lowerString;
}
if (verificationCodeCategory.HasFlag(VerificationCodeCategory.Uppercase))
{
baseStr += upperString;
}
var baseArray = baseStr.ToCharArray();
for (int i = 0; i < length; i++)
{
var ch = baseArray.ElementAt(Random.Next(baseArray.Length));
sb.Append(ch);
}
return(sb.ToString());
}
