【转载】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...