圖片上傳

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;
using System.Threading.Tasks;
using System.IO;
using System.Text;


namespace WebApiUpload.Controllers
{
    public class FileController : ApiController
    {


        //public HttpResponseMessage PostFile()
        //{
        //    HttpRequestMessage request = this.Request;

        //    string root = System.Web.HttpContext.Current.Server.MapPath("~/App_Data/uploads");
        //    StringBuilder sb = new StringBuilder();
        //    var provider = new RenamingMultipartFormDataStreamProvider(root);
        //    var task = Request.Content.ReadAsMultipartAsync(provider);
        //    //task.Wait();
        //    foreach (var data in provider.FormData)
        //    {
        //        sb.Append(string.Format("form data: {0} ({1})\n",data.GetType(),data.ToString()));
        //    }

        //    foreach (var file in provider.FileData)
        //    {
        //        string localfilename= "big" + DateTime.Now.ToString("yyyyMMddHHmmssff") + ".jpg";
        //        FileInfo fileInfo = new FileInfo(localfilename);
        //        sb.Append(string.Format("Uploaded file: {0} ({1} bytes)\n", fileInfo.Name, fileInfo.Length));
        //    }
        //    return new HttpResponseMessage()
        //    {
        //        Content = new StringContent(sb.ToString())
        //    };


        //}

        //public Task<HttpResponseMessage> PostFile()
        //{
        //    HttpRequestMessage request = this.Request;

        //    string root = System.Web.HttpContext.Current.Server.MapPath("~/App_Data/uploads");
        //    //var provider = new MultipartFormDataStreamProvider(root);//原寫法
        //    var provider = new RenamingMultipartFormDataStreamProvider(root);//重命名寫法
        //    //provider.BodyPartFileNames.sel(kv => kv.Value)
        //    var formprovider = new RenamingMultipartFormDataStreamProvider(root);//重命名寫法

        //    string file1 = "";
        //    foreach (var key in provider.FormData.AllKeys)
        //    {
        //        file1 = file1 + key + provider.FormData[key];
        //    }

        //    var task = request.Content.ReadAsMultipartAsync(provider).
        //        ContinueWith<HttpResponseMessage>(o =>
        //        {
        //            file1 = file1+ provider.GetLocalFileName(provider.FileData[0].Headers);



        //            //多張圖片循環provider.BodyPartFileNames或provider.FileData
        //            //string file1 = provider.GetLocalFileName(provider.FileData[0].Headers);//返回重寫的文件名（注意，因爲packages包版本的不一樣，用BodyPartFileNames仍是FileData須要留意）
        //            // this is the file name on the server where the file was saved                     

        //            return new HttpResponseMessage()
        //            {
        //                Content = new StringContent("File uploaded." + file1 )
        //            };
        //        }
        //    );

        //    return task;
        //}


        [HttpPost]
        public async Task<Dictionary<string, string>> PostFile()
        {

            //if (!Request.Content.IsMimeMultipartContent())
            //{
            //    throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);
            //}
            Dictionary<string, string> dic = new Dictionary<string, string>();
            string root = System.Web.HttpContext.Current.Server.MapPath("~/App_Data/uploads");//指定要將文件存入的服務器物理位置
            var provider = new RenamingMultipartFormDataStreamProvider(root);
            //try
            //{
            //    // Read the form data.
            //    await Request.Content.ReadAsMultipartAsync(provider);

            //    // This illustrates how to get the file names.
            //    foreach (MultipartFileData file in provider.FileData)
            //    {
            //        Trace.WriteLine(provider.GetLocalFileName(file.Headers));//獲取上傳文件實際的文件名
            //        ///Trace.WriteLine("Server file path: " + file.LocalFileName);//獲取上傳文件在服務上默認的文件名
            //    }//TODO:這樣作直接就將文件存到了指定目錄下，暫時不知道如何實現只接收文件數據流但並不保存至服務器的目錄下，由開發自行指定如何存儲，好比經過服務存到圖片服務器
            //    StreamWriter sw = File.AppendText("D:\\test.txt");

            //    foreach (var key in provider.FormData.AllKeys)
            //    {//接收FormData
            //        sw.Write(key + "," + provider.FormData[key] + ";");
            //       // dic.Add(key, provider.FormData[key]);
            //    }
            //    sw.Close();

            //}
            //catch
            //{
            //    throw;
            //}

            var task = Request.Content.ReadAsMultipartAsync(provider).
               ContinueWith<HttpResponseMessage>(t =>
               {
                   if (t.IsFaulted || t.IsCanceled)
                   {
                       Request.CreateErrorResponse(HttpStatusCode.InternalServerError, t.Exception);
                   }
                   StreamWriter sw = File.AppendText("D:\\test.txt");

                   foreach (var key in provider.FormData.AllKeys)
                   {//接收FormData
                       sw.Write(key + "," + provider.FormData[key] + ";");
                       // dic.Add(key, provider.FormData[key]);
                   }
                   sw.Close();

                   // This illustrates how to get the file names.
                   // 如下描述瞭如何獲取文件名
                   foreach (MultipartFileData file in provider.FileData)
                   {
                       Trace.WriteLine(file.Headers.ContentDisposition.FileName);
                       //Trace.WriteLine("Server file path: " + file.LocalFileName);
                   }
              

                   return Request.CreateResponse(HttpStatusCode.OK);
               });

            return dic;
        }
    }
}

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Net.Http.Headers;
using System.IO;

public class RenamingMultipartFormDataStreamProvider : MultipartFormDataStreamProvider
{
    public string Root { get; set; }
    //public Func<FileUpload.PostedFile, string> OnGetLocalFileName { get; set; }

    public RenamingMultipartFormDataStreamProvider(string root)
        : base(root)
    {
        Root = root;
    }

    public override string GetLocalFileName(HttpContentHeaders headers)
    {
        string filePath = headers.ContentDisposition.FileName;

        // Multipart requests with the file name seem to always include quotes.
        if (filePath.StartsWith(@"""") && filePath.EndsWith(@""""))
            filePath = filePath.Substring(1, filePath.Length - 2);
        var extension = Path.GetExtension(filePath);

        string filename = "big" + DateTime.Now.ToString("yyyyMMddHHmmssff") + extension;
        var contentType = headers.ContentType.MediaType;

        return filename;
    }

}