Javascript atob(str)在c#中等效

Question

我这样做了:

 byte[] data = Convert.FromBase64String(str);
 string decodedString = Encoding.UTF8.GetString(data);
 Console.WriteLine(decodedString);

但得到了 Unhandled Exception: System.FormatException: Invalid length for a Base-64 char array or string.

在javascript使用atob(str)给我正确的解码str.

javascript控制台:

atob("eyJpc3MiOiJodHRwczovL2lkZW50aXR5LXN0YWdpbmcuYXNjZW5kLnh5eiIsImF1ZCI6Imh0dHBzOi8vaWRlbnRpdHktc3RhZ2luZy5hc2NlbmQueHl6L3Jlc291cmNlcyIsImNsaWVudF9pZCI6IjY5OTRBNEE4LTBFNjUtNEZFRC1BODJCLUM2ODRBMEREMTc1OCIsInNjb3BlIjpbIm9wZW5pZCIsInByb2ZpbGUiLCJzdWIucmVhZCIsImRhdGEud3JpdGUiLCJkYXRhLnJlYWQiLCJhbGcuZXhlY3V0ZSJdLCJzdWIiOiIzNzdjMDk1Yi03ODNiLTQ3ZTctOTdiMS01YWVkOThjMDM4ZmMiLCJhbXIiOiJleHRlcm5hbCIsImF1dGhfdGltZSI6MTQwNzYxNTUwNywiaWRwIjoiaHR0cHM6Ly9zdHMud2luZG93cy5uZXQvMDg0MGM3NjAtNmY3Yi00NTU2LWIzMzctOGMwOTBlMmQ0NThkLyIsIm5hbWUiOiJwa3NAYXNjZW5kLnh5eiIsImV4cCI6MTQwNzgzNjcxMSwibmJmIjoxNDA3ODMzMTExfQ")
"{"iss":"https://identity-staging.ascend.xyz","aud":"https://identity-staging.ascend.xyz/resources","client_id":"6994A4A8-0E65-4FED-A82B-C684A0DD1758","scope":["openid","profile","sub.read","data.write","data.read","alg.execute"],"sub":"377c095b-783b-47e7-97b1-5aed98c038fc","amr":"external","auth_time":1407615507,"idp":"https://sts.windows.net/0840c760-6f7b-4556-b337-8c090e2d458d/","name":"pks@ascend.xyz","exp":1407836711,"nbf":1407833111}"

Answer 1

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

在c#中解决了

Answer 2

使用javascript 的 window.btoa函数在 Javascript 前端 UI 中以 Base 64 格式对字符串进行编码。要在 C# 中解码相同的字符串（相当于javascript 的 window.atob函数），请参阅以下代码。

（很可能您正在尝试将数据（在大多数情况下为 HTML，因为它需要 btoa 编码以确保最佳兼容性）回发回控制器，或者您可能会在服务器端创建自定义的基本身份验证过滤器）

string base64Encoded = "YmFzZTY0IGVuY29kZWQgc3RyaW5n";
string base64Decoded;
byte[] data = System.Convert.FromBase64String(base64Encoded);
base64Decoded = System.Text.ASCIIEncoding.ASCII.GetString(data);
Console.WriteLine(base64Decoded)

您可以在https://dotnetfiddle.net/abxwSw查看其工作示例