C#的Convert.FromBase64String

Invalid length for a Base-64 char array.

异常信息

引用https://stackoverflow.com/questions/2925729/invalid-length-for-a-base-64-char-array

 

string base64string

int mod4 = base64string.Length % 4;
if (mod4 > 0 )
{
base64string += new string('=', 4 - mod4);
}

这个方法很给力