錯誤base64EncodeInvalid長度爲一個基地-64字符數組或字符串

-1

我想通過使用下面的C＃代碼一些串進行解碼：錯誤base64EncodeInvalid長度爲一個基地-64字符數組或字符串

public static string deCodeStdXML(string encodeXML) 
{ 
    string str2; 
    try 
    { 
     byte[] data = System.Convert.FromBase64String(encodeXML); 
     str2 = System.Text.ASCIIEncoding.ASCII.GetString(data); 
    } 
    catch (Exception exception) 
    { 
     throw new Exception("Error in base64Encode" + exception.Message); 
    } 
    return str2; 
}

但是當我長的字符串進行測試，這是行不通的，見下圖：

string encodeXML = @"H4sIAAAAAAAEAOy9B2AcSZYlJi9tynt/SvVK1+B0oQiAYBMk2JBAEOzBiM3mkuwdaUcjKasqgcplVmVdZhZAzO2dvPfee++999577733ujudTif33/8/XGZkAWz2zkrayZ4hgKrIHz9+fB8/Il5mdbvM6/SLvGmyizx9lU/z4jKf/czLYpWXxTL/md/7i+f64ZNs8abOpm+L5cXPPH69+HKVL39yL323KJfNo3fN7LOP5m27enT37tXV1fjq3riqL"; 
string result = deCodeStdXML(encodeXML); 
Console.WriteLine(result);

它拋出異常：

System.Exception was unhandled 
    HResult=-2146233088 
    Message=Error in base64EncodeInvalid length for a Base-64 char array or string. 
    Source=HarnessDBLayer 
    StackTrace: 
     at HarnessDBLayer.DBHelper.deCodeStdXML(String encodeXML) in c:\Users\zhanzhex\Documents\Visual Studio 2012\Projects\XMLValidation\HarnessDBLayer\DBLayer.cs:line 602 
     at ConsoleApplication1.Program.TEST_deCodeStdXML() in c:\Users\zhanzhex\Documents\Visual Studio 2012\Projects\XMLValidation\ConsoleApplication1\Program.cs:line 43 
     at ConsoleApplication1.Program.Main(String[] args) in c:\Users\zhanzhex\Documents\Visual Studio 2012\Projects\XMLValidation\ConsoleApplication1\Program.cs:line 22 
     at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args) 
     at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args) 
     at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() 
     at System.Threading.ThreadHelper.ThreadStart_Context(Object state) 
     at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) 
     at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) 
     at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) 
     at System.Threading.ThreadHelper.ThreadStart() 
    InnerException:

有誰能夠告訴我如何解決這個問題？

來源

2016-11-21 user2575502

那麼，這根本就不是一個有效的base64字符串。它有257個字符。它需要填充是有效的base64 ...你從哪裏開始的？順便說一句，你的try/catch塊比沒有意義的更糟糕 - 它將刪除可能有用的堆棧跟蹤。只是擺脫它，並將你的方法變成一種雙線法... –

您的字符串不是有效的base64字符串。查看上面的鏈接瞭解更多關於base64的信息。

您可以輕鬆地通過計算字符串長度檢查：

Console.WriteLine("H4sIAAAAAAAEAOy9B2AcSZYlJi9tynt/SvVK1+B0oQiAYBMk2JBAEOzBiM3mkuwdaUcjKasqgcplVmVdZhZAzO2dvPfee++999577733ujudTif33/8/XGZkAWz2zkrayZ4hgKrIHz9+fB8/Il5mdbvM6/SLvGmyizx9lU/z4jKf/czLYpWXxTL/md/7i+f64ZNs8abOpm+L5cXPPH69+HKVL39yL323KJfNo3fN7LOP5m27enT37tXV1fjq3riqL".Length);

這將輸出值「257」，從而可以從維基百科頁面看看是不是它的長度的有效怎麼一回事，因爲。 :)

希望能幫助你。

來源

2016-11-21 08:29:11

錯誤base64EncodeInvalid長度爲一個基地-64字符數組或字符串

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