从BASE64字符串转换为长期在C＃ [英] Convert from base64 string to long in C#

问题描述

您好我有使用以下code产生了一些字符串：

Hi I have some strings generated using the following code:

private static string CalcHashCode(byte[] data)
{
    MD5CryptoServiceProvider md5Provider = new MD5CryptoServiceProvider();
    Byte[] hash = md5Provider.ComputeHash(data);

    return Convert.ToBase64String(hash);
}

我怎样才能得到一个独特的长从EN codeD的base64字符串，我的意思是，相反的操作，然后将其转换为长？

How can I get a unique long from a encoded base64 string, I mean, the opposite operation, and then convert it to long?

private long CalcLongFromHashCode(string base64Hashcode)
{
  //TODO
}

先谢谢了。

推荐答案

您不能一个base-64字符串转换为长（或它可能会被截断，如果它不适合，因为长仅用8个字节）...

You can't convert a base-64 string to a long (or it might be truncated if it doesn't fit, as long uses only 8 bytes)...

这是可能将其转换为字节数组（这是'的相反的'操作）：

It's possible to convert it to a byte array (which is 'the opposite' operation):

 byte[] hash = new byte[] { 65, 66, 67, 68, 69 };
 string string64 = Convert.ToBase64String(hash);
 byte[] array = Convert.FromBase64String(string64);

如果您的数组包含至少8个字节，那么你可以让你长值：

If your array contains at least 8 bytes, then you could get your long value:

long longValue = BitConverter.ToInt64(array, 0);

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