输入不是有效的 Base-64 字符串，因为它包含非 base 64 字符 [英] The input is not a valid Base-64 string as it contains a non-base 64 character

问题描述

我有一个 REST 服务，它读取文件并将其转换为字节数组，然后转换为 Base64 字符串后将其发送到另一个控制台应用程序.这部分有效，但是当应用程序接收到相同的流时，它会被操纵并且不再是有效的 Base64 字符串.一些垃圾字符被引入到流中.

I have a REST service that reads a file and sends it to another console application after converting it to Byte array and then to Base64 string. This part works, but when the same stream is received at the application, it gets manipulated and is no longer a valid Base64 string. Some junk characters are getting introduced into the stream.

将流转换回字节时收到的异常是

The exception received when converting the stream back to Byte is

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非空格填充字符中的字符

The input is not a valid Base-64 string as it contains a non-base 64 character, more than two padding characters, or a non-white space character among the padding characters

服务中:

[WebGet(UriTemplate = "ReadFile/Convert", ResponseFormat = WebMessageFormat.Json)]  
public string ExportToExcel()
  {
      string filetoexport = "D:\SomeFile.xls";
      byte[] data = File.ReadAllBytes(filetoexport);
      var s = Convert.ToBase64String(data);
      return s;
  }

申请时:

       var client = new RestClient("http://localhost:56877/User/");
       var request = new RestRequest("ReadFile/Convert", RestSharp.Method.GET);
       request.AddHeader("Accept", "application/Json");
       request.AddHeader("Content-Type", "application/Json");
       request.OnBeforeDeserialization = resp => {resp.ContentType =    "application/Json";};
       var result = client.Execute(request);
       byte[] d = Convert.FromBase64String(result.Content); 

推荐答案

检查你的图片数据开头是否包含一些头部信息:

Check if your image data contains some header information at the beginning:

imageCode = "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAMgAAABkC...

这会导致上述错误.

只需删除前面的所有内容(包括第一个逗号)，一切顺利.

Just remove everything in front of and including the first comma, and you good to go.

imageCode = "iVBORw0KGgoAAAANSUhEUgAAAMgAAABkC...

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