在 web Api 项目中获取上传文件的字节数组

Question

我正在开发一个 Android 应用程序，该应用程序与 WebApi .NET 项目通信，以便从数据库中插入和获取日期，常见情况。我试过使用多部分 MIME。所以我使用了以下代码：

public async Task<HttpResponseMessage> ManageProfilePicture()
    {
        if (!Request.Content.IsMimeMultipartContent())
        {
            throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);
        }
        string root = HttpContext.Current.Server.MapPath("~/App_Data");
        var provider = new MultipartFormDataStreamProvider(root);

        var task = await Request.Content.ReadAsMultipartAsync(provider).
            ContinueWith<HttpResponseMessage>(t =>
            {
                if (t.IsFaulted || t.IsCanceled)
                {
                    Request.CreateErrorResponse(HttpStatusCode.InternalServerError, t.Exception);
                }

                String fileName = provider.FileData[0].Headers.ContentDisposition.FileName;
                return Request.CreateResponse(HttpStatusCode.OK);
            });

        return task;
    }

我可以得到上传文件的文件名和其他信息。我如何获取与上传文件关联的字节数组以便将其保存在 MS SQL Server 中？也许在可访问的文件夹中重新创建图片比将其存储在数据库中更好...

有人可以帮我吗？

Answer 1

您的需求可以参考下面的示例代码：

            // process incoming request            
            if (!Request.Content.IsMimeMultipartContent())
            {                
                // return error response               
            }

            // read the file and form data.
            ...
            await Request.Content.ReadAsMultipartAsync(provider);                           
            ...

            // check if files are on the request.
            if (provider.FileStreams.Count == 0)
            {                
                // return return error response               
            }

            IList<string> uploadedFiles = new List<string>();

            foreach (KeyValuePair<string, Stream> file in provider.FileStreams)
            {
                // get file name and file stream
                byte[] photo;
                string fileName = file.Key;
                using (Stream stream = file.Value)
                {
                    using (BinaryReader reader = new BinaryReader(stream))
                    {
                        photo = reader.ReadBytes((int)stream.Length);
                    }
                }

                // INSERT INTO DATABASE HERE (USING SqlConnection, SqlCommand...)                
                // ...

                // keep track of the filename and filelength for the response
                uploadedFiles.Add(fileName);
                uploadedFiles.Add(photo.Length.ToString("N0") + " bytes");
            }

            // return successful response;

希望对您有所帮助！

P/S：您可以阅读更多here。

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