Is there any class in .Net 4.0 that be able to create random string?

I want to create a random string (about 20 characters length). Is there any built-in class in .net that able to create random stri开发者_StackOverflowng?

You could create a Guid then convert it to a string.

Guid.NewGuid().ToString()

This will give you a random string with the length 36, but you could then just trim this down to 20.

Path.GetRandomFileName Method

The GetRandomFileName method returns a cryptographically strong, random string that can be used as either a folder name or a file name. Unlike GetTempFileName, GetRandomFileName does not create a file. When the security of your file system is paramount, this method should be used instead of GetTempFileName.

Use Guid.NewGuid().ToString().Replace('-', default(Char)).Substring(0, 20)

How about:

string myString = Guid.NewGuid().ToString().Substring(0, 20);

You should try TestApi, more specifically the Text String Generation API.

Path.GetRandomFileName() will create you a random file name - think it's only 11 chars long though.

Generating Random Strings in .NET

http://www.keyvan.ms/generating-random-strings-in-net

Article covers GUID, Random Numbers and RNGCryptoServiceProvider methods to generate random string

Here is a function I wrote that uses GetRandomFileName() to get a random string of any length.

''' <summary>
''' Obtain a random string of any length.
''' </summary>
''' <param name="length">Desired length of string.</param>
''' <returns></returns>
''' <remarks></remarks>
Public Shared Function GetRandomString(ByVal length As Integer) As String        
    Dim sb As New StringBuilder(length)
    While (sb.Length < length)
        ' GetRandomFileName returns a "cryptographically strong" random filename ex: "bfdbn2af.sxq"
        sb.Append(IO.Path.GetRandomFileName().Replace(".", ""))
    End While
    ' strip the excess characters
    sb.Remove(length - 1, sb.Length - length)
    Return sb.ToString()
End Function