Question

我正在尝试获取文件的base64加密版本，将其解密，然后将文件写入服务器。我无法弄清楚为什么这段代码不起作用，任何帮助都会受到赞赏，因为我现在收到错误：File Not Found。这是我的代码：

<%@ Page Language="C#" %>
<%@ Import Namespace="System.Web" %>
<%@ Import Namespace="System.IO" %>
<script runat="server">
  public void Page_Load(object sender, EventArgs e){
    HttpContext c = HttpContext.Current;
    //string data = Decode(c.Request["file"]);
    //string name = c.Request["name"];
    string name = "target.docx";
    string data = Decode("SUPER LONG BASE 64, DIDNT POST BECAUSE WAY TOO LARGE");
    StreamWriter writer = File.CreateText(Server.MapPath("~/services/temp/"+name));
    // Error generated here, after previous line.
    writer.WriteLine(data);
    writer.Close();
    Response.Redirect("temp/"+name);
  }
  public string Decode(string str){
    byte[] decbuff = Convert.FromBase64String(str);
    return System.Text.Encoding.UTF8.GetString(decbuff);
  }
</script>

Answer 1

我想通了，我需要从wwwroot创建一个本地目录，因为在sharepoint designer中创建的目录不是物理的，这是代码。

<%@ Page Language="C#" %>
<%@ Import Namespace="System.Web" %>
<%@ Import Namespace="System.IO" %>
<script runat="server">
  public void Page_Load(object sender, EventArgs e){
    HttpContext c = HttpContext.Current;
    //string data = Decode(c.Request["file"]);
    //string name = c.Request["name"];
    Response.Write(Server.MapPath("/temp/hurrdurr.txt"));
    string name = "target.docx";
    string data = "THE GIANT BASE 64 DATA";
    using(StreamWriter writer = new StreamWriter(Server.MapPath("/temp/"+name), true)){
      writer.WriteLine(Decode(data));
      writer.Close();
    }
    FileStream fs = File.Open(Server.MapPath("/temp/"+name), FileMode.Open);
    byte[] file = new byte[fs.Length];
    fs.Read(file, 0, Convert.ToInt32(fs.Length));
    fs.Close();
    Response.AddHeader("Content-disposition", "attachment; filename=" + name);
    Response.ContentType = "application/octet-stream";
    Response.BinaryWrite(file);
    Response.End();
  }
  public string Decode(string str){
    byte[] decbuff = Convert.FromBase64String(str);
    return System.Text.Encoding.UTF8.GetString(decbuff);
  }
</script>

Answer 2

您也可以完全避开临时文件。

string sName = "target.docx";
string sBase64 = "THE GIANT BASE 64 DATA";        
Response.AddHeader("Content-disposition", "attachment; filename=" + sName);
Response.ContentType = "application/octet-stream";
Response.BinaryWrite(System.Convert.FromBase64String(sBase64));
Response.End();

从具有C＃代码的ASPX页面中的base64数据写入文件

2 个答案: