关于MVC4.0 WebAPI上传图片重命名以及图文结合

关于MVC4.0 WebAPI上传图片重命名以及图文结合

MVC4.0 WebAPI上传后的图片默认以字符串bodypart结合Guid来命名，且没有文件后缀，为解决上传图片重命名以及图文结合发布的问题，在实体对象的处理上，可将图片属性定义为byte[]对象，至于图片的重命名，通过重写继承MultipartFormDataStreamProvider类来解决！

参照API的官方文档，上传文件代码大致如下：

public Task<HttpResponseMessage> PostFile()

        {

            HttpRequestMessage request = this.Request;         



            string root = System.Web.HttpContext.Current.Server.MapPath("~/App_Data/uploads");

            //var provider = new MultipartFormDataStreamProvider(root);//原写法

            var provider = new RenamingMultipartFormDataStreamProvider(root);//重命名写法

            //provider.BodyPartFileNames.sel(kv => kv.Value)

            var task = request.Content.ReadAsMultipartAsync(provider).

                ContinueWith<HttpResponseMessage>(o =>

                {

                    string file1 = provider.BodyPartFileNames.First().Value;

                    // this is the file name on the server where the file was saved                     



                    return new HttpResponseMessage()

                    {

                        Content = new StringContent("File uploaded." + file1)

                    };

                }

            );

            return task;

        }

 

再来看看继承MultipartFormDataStreamProvider的类:

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 filename = Path.GetFileName(filePath);

            var extension = Path.GetExtension(filePath);

            var contentType = headers.ContentType.MediaType;



            return filename;         

        }        



    } 待续...