c# 文件转换成base64

private static void ReadFromFile()
{
FileStream fsForRead = new FileStream("c9a78c8a-29b0-410d-9c27-58e6be5dbccd.wav", FileMode.Open);
string base64Str = "";
try
{
//读入一个字节
Console.Write("文件的第一个字节为：" + fsForRead.ReadByte().ToString());
Console.ReadLine();
//读写指针移到距开头10个字节处
fsForRead.Seek(0, SeekOrigin.Begin);
byte[] bs = new byte[fsForRead.Length];
int log=Convert.ToInt32(fsForRead.Length);
//从文件中读取10个字节放到数组bs中
fsForRead.Read(bs, 0, log);
base64Str = Convert.ToBase64String(bs);
Console.Write("base64编码：" + base64Str);
Console.ReadLine();
}
catch (Exception ex)
{
Console.Write(ex.Message);
Console.ReadLine();
}
finally
{
fsForRead.Close();
}
}