随机字符串生成器返回相同的字符串

我已经开发了一个随机字符串生成器，但它的行为并不像我所希望的那样。我的目标是能够运行两次，并生成两个不同的四字符随机字符串。但是，它只生成一个四个字符的随机字符串两次。

下面是代码和输出示例:

private string RandomString(int size)
{
    StringBuilder builder = new StringBuilder();
    Random random = new Random();
    char ch;
    for (int i = 0; i < size; i++)
    {
        ch = Convert.ToChar(Convert.ToInt32(Math.Floor(26 * random.NextDouble() + 65)));                 
        builder.Append(ch);
    }

    return builder.ToString();
}

// get 1st random string 
string Rand1 = RandomString(4);

// get 2nd random string 
string Rand2 = RandomString(4);

// create full rand string
string docNum = Rand1 + "-" + Rand2;

.．.输出如下:UNTE-UNTE .．.但它应该看起来像这个UNTE-FWNU

如何确保两个明显随机的字符串?

当前回答

对于随机字符串生成器:

#region CREATE RANDOM STRING WORD
        char[] wrandom = {'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','R','S','T','U','V','X','W','Y','Z'};
        Random random = new Random();
        string random_string = "";
        int count = 12; //YOU WILL SPECIFY HOW MANY CHARACTER WILL BE GENERATE
        for (int i = 0; i < count; i++ )
        {
            random_string = random_string + wrandom[random.Next(0, 24)].ToString(); 
        }
        MessageBox.Show(random_string);
        #endregion

2014-01-02 12:47:31

其他回答

在我的情况下，密码必须包含:

至少有一个小写字母。至少一个大写字母。至少有一个小数。至少一个特殊字符。

这是我的代码:

    private string CreatePassword(int len)
    {
        string[] valid = { "abcdefghijklmnopqrstuvwxyz", "ABCDEFGHIJKLMNOPQRSTUVWXYZ", "1234567890", "!@#$%^&*()_+" };
        RNGCryptoServiceProvider rndGen = new RNGCryptoServiceProvider();

        byte[] random = new byte[len];
        int[] selected = new int[len];

        do
        {
            rndGen.GetNonZeroBytes(random);

            for (int i = 0; i < random.Length; i++)
            {
                selected[i] = random[i] % 4;
            }
        } 
        while(selected.Distinct().Count() != 4);

        rndGen.GetNonZeroBytes(random);

        string res = "";

        for(int i = 0; i<len; i++)
        {
            res += valid[selected[i]][random[i] % valid[selected[i]].Length];
        }
        return res;
    }

2013-12-12 00:03:58

只要你使用Asp。Net 2.0或更高版本，也可以使用库调用- System.Web.Security.Membership。生成密码，但它将包括特殊字符。

要获得4个随机字符，其中至少有0个特殊字符-

Membership.GeneratePassword(4, 0)

2011-03-23 00:41:53

这里还有一个选择:

public System.String GetRandomString(System.Int32 length)
{
    System.Byte[] seedBuffer = new System.Byte[4];
    using (var rngCryptoServiceProvider = new System.Security.Cryptography.RNGCryptoServiceProvider())
    {
        rngCryptoServiceProvider.GetBytes(seedBuffer);
        System.String chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
        System.Random random = new System.Random(System.BitConverter.ToInt32(seedBuffer, 0));
        return new System.String(Enumerable.Repeat(chars, length).Select(s => s[random.Next(s.Length)]).ToArray());
    }
}

2013-06-17 14:50:39

对于随机字符串生成器:

#region CREATE RANDOM STRING WORD
        char[] wrandom = {'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','R','S','T','U','V','X','W','Y','Z'};
        Random random = new Random();
        string random_string = "";
        int count = 12; //YOU WILL SPECIFY HOW MANY CHARACTER WILL BE GENERATE
        for (int i = 0; i < count; i++ )
        {
            random_string = random_string + wrandom[random.Next(0, 24)].ToString(); 
        }
        MessageBox.Show(random_string);
        #endregion

2014-01-02 12:47:31

还有另一个版本:我在测试中使用这种方法生成随机的伪股票代码:

Random rand = new Random();
Func<char> randChar = () => (char)rand.Next(65, 91); // upper case ascii codes
Func<int,string> randStr = null;
    randStr = (x) => (x>0) ? randStr(--x)+randChar() : ""; // recursive

用法:

string str4 = randStr(4);// generates a random 4 char string
string strx = randStr(rand.next(1,5)); // random string between 1-4 chars in length

你可以重新定义randChar函数，使用一个“允许的”字符数组，而不是ascii码:

char[] allowedchars = {'A','B','C','1','2','3'};
Func<char> randChar = () => allowedchars[rand.Next(0, allowedchars.Length-1)];

2014-04-23 19:25:54

随机字符串生成器返回相同的字符串

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