如何获得带空格和混合大小写的随机字符串？

我需要生成一个包含空格和mixedCase的随机字符串.

这就是我到目前为止所做的一切:

    /// 

    /// The Typing monkey generates random strings - can't be static 'cause it's a monkey.
    /// 
    /// 
    /// If you wait long enough it will eventually produce Shakespeare.
    /// 
    class TypingMonkey
    {
        /// 

        /// The Typing Monkey Generates a random string with the given length.
        /// 
        /// Size of the string
        /// Random string
        public string TypeAway(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();
        }
    }

我只得到没有空格的大写字符串 - 我相信调整应该非常严格,以便在汤中混合大小写和空格.

任何帮助非常感谢!

最简单的方法是简单地创建一个包含以下值的字符串:

private readonly string legalCharacters = " abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";

然后使用RNG访问此字符串中的随机元素:

public string TypeAway(int size)
{
    StringBuilder builder = new StringBuilder();
    Random random = new Random();
    char ch;

    for (int i = 0; i < size; i++)
    {
        ch = legalCharacters[random.Next(0, legalCharacters.Length)];
        builder.Append(ch);
    }

    return builder.ToString();
}