c# - 如何在网络位置写入 .csv 文件？

Question

我目前正在使用 Response 对象将 .csv 文件写入客户端浏览器，这过去/现在是一项相当容易的工作。

但现在要求已更改为在网络位置创建此文件，作业可以随时从该位置选择它。

我不确定如何实现这一目标，任何建议都会有所帮助。

现有代码:

Response.ClearContent();
Response.AddHeader("content-disposition", "attachment;filename=" + GenerateFileName(publishToViewModel[0].ProjectId));
Response.ContentType = "text/csv";
StreamWriter writer = new StreamWriter();
try
{
    string CSVFriendlyData = this.GetCSV(publishToViewModel);
    writer.Write(CSVFriendlyData);
    Response.Write(writer.ToString());
    Response.End();
}

Answer 1

因为很难保证对网络文件的写入会成功(您的旧文件可能仍然存在，并且定时作业可能锁定了它，等等)建立一个机制是个好主意将多次重试写入文件。

void WriteToNetworkFile()
{
  int retries = 3;    
  while(retries > 0)
  {
     if(tryWriteFile())
     {
        break;
     } 
     retries--;

     // you could add a timeout here to make sure your attempts are a little more
     //spaced out.
     //it could be in the form of a Thread.Sleep, or you could extract a method and
     //call it using a timer.

     if(retries < 1)
     {
        //log that we failed to write the file and gave up on trying.
     }
  }
}    
protected void tryWriteFile()
{
   try
   {
     //you could pass this path as a parameter too.
     var fileLoc = "\\server\folder\file.ext";

     //open and obtain read/write lock on the file
     //using FileMode.CreateNew will ensure that a new file is created.
     //alternatively, you can use FileMosw.Create to create a new file
     //or overwrite the old file if it is there.
     using (var fs = File.Open(fileLoc, FileMode.CreateNew, FileAccess.ReadWrite, FileShare.None))
     {
          var sw = new StreamWriter(fs);
          sw.Write("file contents go here");
          sw.Flush();
          sw.Close();
          return true;
     }
    }
    catch(Exception e)
    {
       //you might want to log why the write failed here.
       return false;
    }
}