Question

Hey Stackoverflow＆＃39;

我使用ASP.net WebApi从Cordova应用程序接收上传（通过HTTP多部分POST请求发送）。上传是＆＃34; chunked＆＃34;因此，我需要在第一个块上创建一个文件，然后追加每个后续的＆＃34; chunk＆＃34;它。以下是我目前正在使用的内容：

public class CustomMultipartFormDataStreamProvider : MultipartFormDataStreamProvider
{
    public CustomMultipartFormDataStreamProvider(string path) : base(path)
    { }

    public override string GetLocalFileName(System.Net.Http.Headers.HttpContentHeaders headers)
    {
        var name = !string.IsNullOrWhiteSpace(headers.ContentDisposition.FileName) ? headers.ContentDisposition.FileName : "NoName";
        return name.Replace("\"", string.Empty); //this is here because Chrome submits files in quotation marks which get treated as part of the filename and get escaped
    }
}

并在控制器......

    [Route("upload"), HttpGet, HttpPost]
    public void HandleUpload()
    {
        string root = HttpContext.Current.Server.MapPath("~/App_Data/upload-temp");
        if (Request.Content.IsMimeMultipartContent())
        {
            var streamProvider = new Libs.CustomMultipartFormDataStreamProvider(root);

            var task = Request.Content.ReadAsMultipartAsync(streamProvider).ContinueWith(t =>
                {
                    if (t.IsFaulted || t.IsCanceled)
                        throw new HttpResponseException(HttpStatusCode.InternalServerError);
                });
        }
        else
        {
            throw new HttpResponseException(Request.CreateResponse(HttpStatusCode.NotAcceptable, "This request is not properly formatted"));
        }
    }

我在CustomMultipartFormDataStreamProvider中假设我会以某种方式覆盖GetStream以完成追加，但是对于我的生活我不能理解它...

有没有人对如何做到这一点有所了解？

干杯：）

Answer 1

这篇文章正是我正在处理的问题，其诀窍是覆盖自定义 MultipartFormDataStreamProvider 中的 GetStream 方法。我的解决方案基于System.Net.Http.MultipartFormDataStreamProvider提供程序的源代码。

void tileInit()
{
    struct tileStruct * tileArr = (struct tileStruct *)malloc(NUM_TILES_IN_WINDOW * sizeof(struct tileStruct)); 

    tileArr->tilePixel = (SDL_Rect *) malloc(tPIXELS_PER_TILE * sizeof(SDL_Rect));   

    tileArr->tpColor = (Uint32 *) malloc(tPIXELS_PER_TILE * sizeof(Uint32));        
    tileArr->xCoord = (int *) malloc(sizeof(int));                                   
    tileArr->yCoord = (int *) malloc(sizeof(int));
    tileArr->tileNum = (int *) malloc(sizeof(int));

    //rest of function
}

MultipartFormDataStreamProvider并附加到现有文件

1 个答案: