Base-64 字符數組或字符串的長度無效等問題解決方案，base-64數組

string dummyData = base64.Trim().Replace("%", "").Replace(",", "").Replace(" ", "+");

if (dummyData.Length % 4 > 0)

{

    dummyData = dummyDaaseta.PadRight(dummyData.Length + 4 - dummyData.Length % 4, '=');

}

MemoryStream stream = new MemoryStream(Convert.FromBase64String(dummyData));

 

原文章參考：http://www.bkjia.com/C_jc/1157400.html