ASP.NET WebAPI更改文件名？

Question

我試圖將圖像的文件名更改爲我張貼在輸入框username中的值。這些文件正在上傳到服務器，並且在覆蓋GetLocalFileName之後，文件名稱從「BodyPart_（xyz）」更改爲原始文件。如何將它們重命名爲我在輸入框中提供的值？

<form name="form1" method="post" enctype="multipart/form-data" action="api/poster/postformdata"> 
      <div class="row-fluid fileform"> 
       <div class="span3"><strong>Username:</strong></div> 
       <input name="username" value="test" type="text" readonly/> 
      </div> 

      <div class="row-fluid fileform"> 
       <div class="span3"><strong>Poster:</strong></div> 
       <div class="span4"><input name="posterFileName" ng-model="posterFileName" type="file" /></div> 
      </div> 

      <div class="row-fluid fileform"> 
       <div class="span8"><input type="submit" value="Submit" class="btn btn-small btn-primary submitform" /></div> 
      </div> 
</form> 

我已經存儲了我的newName變量收到的價值，但我對如何重命名服務器上的文件混淆。

public async Task<HttpResponseMessage> PostFormData() 
      { 
       if (!Request.Content.IsMimeMultipartContent()) 
       { 
        throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType); 
       } 

       string root = HttpContext.Current.Server.MapPath("~/App_Data"); 
       var provider = new MultipartFormDataStreamProvider(root); 

       try 
       { 
        await Request.Content.ReadAsMultipartAsync(provider); 
        // Show all the key-value pairs. 
        foreach (var key in provider.FormData.AllKeys) 
        { 
         foreach (var val in provider.FormData.GetValues(key)) 
         { 
          Trace.WriteLine(string.Format("{0}: {1}", key, val)); 
          newName = val; 
         } 
        } 

        return Request.CreateResponse(HttpStatusCode.OK); 
       } 
       catch (System.Exception e) 
       { 
        return Request.CreateErrorResponse(HttpStatusCode.InternalServerError, e); 
       } 
      } 

      public class MyMultipartFormDataStreamProvider : MultipartFormDataStreamProvider 
      { 
       public MyMultipartFormDataStreamProvider(string path) 
        : base(path) 
       { 

       } 

       public override string GetLocalFileName(System.Net.Http.Headers.HttpContentHeaders headers) 
       { 
        string fileName; 
        if (!string.IsNullOrWhiteSpace(headers.ContentDisposition.FileName)) 
        { 
         fileName = headers.ContentDisposition.FileName; 
        } 
        else 
        { 
         fileName = Guid.NewGuid().ToString() + ".data"; 
        } 
        return fileName.Replace("\"", string.Empty); 
       } 
      } 

Answer 1

一種方法是重寫ExecutePostProcessingAsync方法如下所示：

public override async Task ExecutePostProcessingAsync() 
{ 
    await base.ExecutePostProcessingAsync(); 

    // By this time the file would have been uploaded to the location you provided 
    // and also the dictionaries like FormData and FileData would be populated with information 
    // that you can use like below 

    string targetFileName = FormData["username"]; 

    // get the uploaded file's name 
    string currentFileName = FileData[0].LocalFileName; 

    //TODO: rename the file 
}