http://msdn.microsoft.com/en-us/library/system.io.path.getrandomfilename.aspx
string randomName = Path.GetRandomFileName();
randomName = randomName.Replace(".", string.Empty);
// take substring...
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例如:
?Path.GetRandomFileName();
"rlwi1uew.5ha"
?Path.GetRandomFileName();
"gcwhcoiy.vxl"
?Path.GetRandomFileName();
"2pzyljzf.k41"
?Path.GetRandomFileName();
"kyjzcccf.d3c"
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