ASP.NET WebAPI change file name?

Question

I am trying to change the file name of images to the value that I posted in the input box username. The files are getting uploaded to the server and also, after overriding GetLocalFileName the file name is changed from "BodyPart_(xyz)" to the original one. How do I rename them to the value that I provided in the input box?

<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>

I have stored the value that I received in the newName variable but I am confused on how to rename the file in the server.

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);
                }
            }

Kiran · Accepted Answer · 2014-02-28 18:12:07Z

1

One way is to override the ExecutePostProcessingAsync method like the following:

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
}

answered Feb 28, 2014 at 18:12

Kiran

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1 Comment

magnum Over a year ago

Thanks a lot. I couldn't figure out how to copy the file with the new name and delete the old file. How do I implement that in the ExecutePostProcessingAsync() itself?

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