/// <summary>
/// 生成大小写字母和数字组合的字符串
/// <para>默认随机为大小写和数字</para>
/// </summary>
/// <param name="len">生成长度</param>
/// <param name="type">随机代码类型</param>
/// <param name="seed">随机种子</param>
/// <returns>生成的字符串</returns>
public static string Generate(int len, RandomCodeType type = RandomCodeType.HighLowLetterAndNumber, int?seed = null)
{
StringBuilder newRandom = null;
var rd = random;
if (seed != null)
{
rd = new Random((int)seed);
}
switch (type)
{
case RandomCodeType.HighLowLetterAndNumberAndSymbol:
newRandom = new StringBuilder(charHighLowLetterAndNumberAndSymbol.Length);
for (int i = 0, arrlen = charHighLowLetterAndNumberAndSymbol.Length; i < len; i++)
{
newRandom.Append(charHighLowLetterAndNumberAndSymbol[rd.Next(arrlen)]);
}
break;
case RandomCodeType.HighLowLetterAndNumber:
newRandom = new StringBuilder(charHighLowLetterAndNumber.Length);
for (int i = 0, arrlen = charHighLowLetterAndNumber.Length; i < len; i++)
{
newRandom.Append(charHighLowLetterAndNumber[rd.Next(arrlen)]);
}
break;
case RandomCodeType.HighLetterAndNumber:
newRandom = new StringBuilder(charHighLetterAndNumber.Length);
for (int i = 0, arrlen = charHighLetterAndNumber.Length; i < len; i++)
{
newRandom.Append(charHighLetterAndNumber[rd.Next(arrlen)]);
}
break;
case RandomCodeType.HighLetter:
newRandom = new StringBuilder(charHighLetter.Length);
for (int i = 0, arrlen = charHighLetter.Length; i < len; i++)
{
newRandom.Append(charHighLetter[rd.Next(arrlen)]);
}
break;
case RandomCodeType.Number:
newRandom = new StringBuilder(charNumber.Length);
for (int i = 0, arrlen = charNumber.Length; i < len; i++)
{
newRandom.Append(charNumber[rd.Next(arrlen)]);
}
break;
}
return(newRandom.ToString());
}
public RandomGeneratorSetting(RandomCodeType type, short length)
{
this.Type = type;
this.Length = length;
}
