主题：[求助]字符的随机显示

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此主题相关图片如下：qq截图20140718095420.jpg

 

定义15个字符，要随机显示30出个字符请问要怎么写

Dim str() As String = {"1", "2", "3", "4", "5", "6", "7", "8", "9", "0", "+", "-", "*", "/", ">"}
For i As Integer = 1 To str.Length '洗牌测次数
    Dim rnum1 As Integer = Rand.Next(str.Length)
    Dim rnum2 As Integer = Rand.Next(str.Length)
    Dim temp As String = str(rnum1)
    str(rnum1) = str(rnum2)
    str(rnum2) = temp   
Next
Dim data As String = String.Join("", str)
For i As Integer = 1 To str.Length '洗牌测次数
    Dim rnum1 As Integer = Rand.Next(str.Length)
    Dim rnum2 As Integer = Rand.Next(str.Length)
    Dim temp As String = str(rnum1)
    str(rnum1) = str(rnum2)
    str(rnum2) = temp   
Next
data &= String.Join("", str)
msgbox(data)

 

请问有点甜老师，定义成30是哪句代码？能指点下吗？谢谢！

 

比如，你定义了10个字符，那么生成随机25字符，就应该是 10个+10个+(10个-5个)

 

上面的代码，每次15个，生成两次，就是30个。

谢谢老师！

上面代码生生成30个字符，要生成25个字符，就要减除5个看看了String的方法和属性还是没明白，请教下要怎样写代码？

Dim str() As String = {"1", "2", "3", "4", "5", "6", "7", "8", "9", "0", "+", "-", "*", "/", ">"}
For i As Integer = 1 To str.Length '洗牌测次数
    Dim rnum1 As Integer = Rand.Next(str.Length)
    Dim rnum2 As Integer = Rand.Next(str.Length)
    Dim temp As String = str(rnum1)
    str(rnum1) = str(rnum2)
    str(rnum2) = temp   
Next
Dim data As String = String.Join("", str)
For i As Integer = 1 To str.Length '洗牌测次数
    Dim rnum1 As Integer = Rand.Next(str.Length)
    Dim rnum2 As Integer = Rand.Next(str.Length)
    Dim temp As String = str(rnum1)
    str(rnum1) = str(rnum2)
    str(rnum2) = temp   
Next
data &= String.Join("", str)
msgbox(data.Substring(0,25))