C# Convert.FromBase64String(...) 抛出 FormatException
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Convert.FromBase64String(...) throws a FormatException
提问by Dave New
The following line of code runs fine in IIS Express:
以下代码行在IIS Express 中运行良好：
Convert.FromBase64String("dmVoaWNsZUlkPTE0MTM=??");
But when run on my local IIS 8 server, it throws the following exception:
但是当在我的本地IIS 8 服务器上运行时，它会抛出以下异常：
System.FormatException:The input is not a valid Base-64 string as it contains a non-base 64 character, more than two padding characters, or an illegal character among the padding characters.
System.FormatException:输入不是有效的 Base-64 字符串，因为它包含非 Base-64 字符、两个以上的填充字符或填充字符中的非法字符。
Why is this happening?
为什么会这样？
采纳答案by Samuel Parkinson
The last two characters "??" are not valid in a base 64 string.
最后两个字符 " ??" 在 base 64 字符串中无效。
Have a read here: https://en.wikipedia.org/wiki/Base64
在这里阅读：https: //en.wikipedia.org/wiki/Base64
The string should end in an alphanumeric character or be padded with one or more =characters.
该字符串应以字母数字字符结尾或填充一个或多个=字符。
Edit— Decoding the string without the ?characters returns "vehicleId=1413", so I guess it's just a case of removing them.
编辑- 解码没有?字符的字符串返回“vehicleId=1413”，所以我想这只是删除它们的一种情况。
