//<summary>
///得到随机字符.
///</summary>
///<param name="intLength">Length of the int.</param>
///<param name="booNumber">if set to <c>true</c> [boo
number].</param>
///<param name="booSign">if set to
<c>true</c> [boo sign].</param>
///<param
name="booSmallword">if set to <c>true</c> [boo
smallword].</param>
///<param name="booBigword">if set to
<c>true</c> [boo bigword].</param>
///<returns></returns>
public string getRandomizer(int intLength, bool booNumber, bool booSign, bool
booSmallword, bool booBigword)
{
//定义
Random ranA =
new Random();
int intResultRound = 0;
int intA =
0;
string strB = "";
while (intResultRound <
intLength)
{
//生成随机数A，表示生成类型
//1=数字，2=符号，3=小写字母，4=大写字母
intA = ranA.Next(1, 5);
//如果随机数A=1，则运行生成数字
//生成随机数A，范围在0-10
//把随机数A，转成字符
//生成完，位数+1，字符串累加，结束本次循环
if (intA == 1 &&
booNumber)
{
intA = ranA.Next(0,
10);
strB = intA.ToString() + strB;
intResultRound = intResultRound + 1;
continue;
}
//如果随机数A=2，则运行生成符号
//生成随机数A，表示生成值域
//1：33-47值域，2：58-64值域，3：91-96值域，4：123-126值域
if
(intA == 2 && booSign == true)
{
intA = ranA.Next(1, 5);
//如果A=1
//生成随机数A，33-47的Ascii码
//把随机数A，转成字符
//生成完，位数+1，字符串累加，结束本次循环
if (intA ==
1)
{
intA = ranA.Next(33,
48);
strB = ((char)intA).ToString() + strB;
intResultRound = intResultRound + 1;
continue;
}
//如果A=2
//生成随机数A，58-64的Ascii码
//把随机数A，转成字符
//生成完，位数+1，字符串累加，结束本次循环
if (intA ==
2)
{
intA = ranA.Next(58,
65);
strB = ((char)intA).ToString() + strB;
intResultRound = intResultRound + 1;
continue;
}
//如果A=3
//生成随机数A，91-96的Ascii码
//把随机数A，转成字符
//生成完，位数+1，字符串累加，结束本次循环
if (intA ==
3)
{
intA = ranA.Next(91,
97);
strB = ((char)intA).ToString() + strB;
intResultRound = intResultRound + 1;
continue;
}
//如果A=4
//生成随机数A，123-126的Ascii码
//把随机数A，转成字符
//生成完，位数+1，字符串累加，结束本次循环
if (intA
== 4)
{
intA = ranA.Next(123,
127);
strB = ((char)intA).ToString() + strB;
intResultRound = intResultRound + 1;
continue;
}
}
//如果随机数A=3，则运行生成小写字母
//生成随机数A，范围在97-122
//把随机数A，转成字符
//生成完，位数+1，字符串累加，结束本次循环
if (intA == 3 && booSmallword
== true)
{
intA = ranA.Next(97,
123);
strB = ((char)intA).ToString() + strB;
intResultRound = intResultRound + 1;
continue;
}
//如果随机数A=4，则运行生成大写字母
//生成随机数A，范围在65-90
//把随机数A，转成字符
//生成完，位数+1，字符串累加，结束本次循环
if (intA == 4 && booBigword
== true)
{
intA = ranA.Next(65,
89);
strB = ((char)intA).ToString() + strB;
intResultRound = intResultRound + 1;
continue;
}
}
return strB;
}
原文：http://www.cnblogs.com/lizikang2013/p/3553235.html