c# - 在MVC c#中将base64转换为可下载的zip文件

Question

我之前可以下载一个 zipfile，但是压缩发生在 ASP 服务器上。现在我们已将此操作更改为另一台服务器（进度）。

此时我收到一个代表 zip 文件的 base64 编码字符串。但是如何将此字符串转换为 zipfile。我之前使用的代码可以在下面找到，我可以重复使用代码吗？

MemoryStream outputStream = new MemoryStream();
outputStream.Seek(0, SeekOrigin.Begin);

using (ZipFile zip = new ZipFile())
{
   foreach (string id in idArray)
   {
        string json = rest.getDocumentInvoice(Convert.ToInt32(id));
        byte[] file = json.convertJsonToFile();
        zip.AddEntry("invoice" + id + ".pdf", file);
   }
    zip.Save(outputStream);
}


outputStream.WriteTo(Response.OutputStream);
Response.AppendHeader("content-disposition", "attachment; filename=invoices.zip");
Response.ContentType = "application/zip";
return new FileStreamResult(outputStream, "application/zip");

我不知道如何将字符串转换为 zip 文件。在此先感谢您的帮助

Answer 1

通过执行以下操作将 base64 转换为字节数组：

Convert.fromBase64String(strBase64);

然后找了一篇文章轻松下载zipfile

使用 FileResult 在 Asp.Net MVC 中下载任何类型的文件？

这篇文章建议：

public FileResult Download()
{
    string base64 = getBase64ZIP();
    byte[] byteArray = Convert.fromBase64String(base64);
    return File(byteArray, System.Net.Mime.MediaTypeNames.Application.Octet, fileName);
}

Answer 2

用于Convert.FromBase64String获取 zip 文件的字节数。

string base64String = rest.getDocumentInvoice(Convert.ToInt32(id));
byte[] file = Convert.FromBase64String(base64String);
using(var stream = new MemoryStream(file))
{
    zip.AddEntry("invoice" + id + ".pdf", stream);
}

Answer 3

尝试这个：

HTML：

>  <a id='dwnldLnk' download='myzip.zip' style="display:none;" /> 
    >     <a ng-click="saveFile()">myzip.zip</a>

控制器：

var dataBase64 = "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"
var dataFile = 'data:application/zip;base64,' + dataBase64 
  var dlnk = document.getElementById('dwnldLnk');
  dlnk.href = dataFile;
  dlnk.click();