C# WebAPI 上传文件和图片

前端使用 ajax+fromData 方式上传；

直接贴源码：

前台页面：

    
    
    
    




    
指定文件名： 
    
上传文件： 
    

webapi 后台代码：

 /// 

        /// 文件上传
        /// 
        /// GUID由前端生成
        /// 
        [HttpPost]
        [Route("api/Upload")]
        public async Task Post(string guid)
        {

            if (!Request.Content.IsMimeMultipartContent())
            {
                throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);
            }
            string uploadFolderPath = HostingEnvironment.MapPath("~/Upload");

            //如果路径不存在，创建路径
            if (!Directory.Exists(uploadFolderPath))
                Directory.CreateDirectory(uploadFolderPath);

            List files = new List();
            var provider = new WithExtensionMultipartFormDataStreamProvider(uploadFolderPath, guid);
            try
            {
                // Read the form data.
                await Request.Content.ReadAsMultipartAsync(provider);

                // This illustrates how to get the file names.
              
                foreach (var file in provider.FileData)
                {//接收文件
                    files.Add(Path.GetFileName(file.LocalFileName));
                }
            }
            catch
            {
                throw;
            }
            return string.Join(",", files);
        }

如需多文件上传，GUID请后台生成。

WithExtensionMultipartFormDataStreamProvider 文件说明：

public class WithExtensionMultipartFormDataStreamProvider : MultipartFormDataStreamProvider
    {
        public string guid { get; set; }

        public WithExtensionMultipartFormDataStreamProvider(string rootPath,string guidStr)
            : base(rootPath)
        {
            guid = guidStr;
        }

        public override string GetLocalFileName(System.Net.Http.Headers.HttpContentHeaders headers)
        {
            string extension = !string.IsNullOrWhiteSpace(headers.ContentDisposition.FileName) ? Path.GetExtension(GetValidFileName(headers.ContentDisposition.FileName)) : "";
            return guid + extension;
        }

        private string GetValidFileName(string filePath)
        {
            char[] invalids = System.IO.Path.GetInvalidFileNameChars();
            return String.Join("_", filePath.Split(invalids, StringSplitOptions.RemoveEmptyEntries)).TrimEnd('.');
        }
    }

OK，测试成功！