最近做上传，发现以前写的《 WebAPI通过multipart/form-data方式接收文件时由开发自行决定如何保存文件》在owin下会取不到文件，所以这里重新修正了下，具体代码如下
using System.IO;
using System.Net.Http;
using System.Net.Http.Headers;
public class MultipartFormDataMemoryStreamProvider : MultipartFormDataStreamProvider
{
public MultipartFormDataMemoryStreamProvider()
: base("/")
{
}
public override Stream GetStream(HttpContent parent, HttpContentHeaders headers)
{
if (parent == null)
{
throw new ArgumentNullException("parent");
}
if (headers == null)
{
throw new ArgumentNullException("headers");
}
MemoryStream stream = new MemoryStream();
if (IsFileContent(parent, headers))
{
MultipartFileData item = new MultipartFileDataStream(headers, string.Empty, stream);
this.FileData.Add(item);
}
return stream;
}
private bool IsFileContent(HttpContent parent, HttpContentHeaders headers)
{
ContentDispositionHeaderValue contentDisposition = headers.ContentDisposition;
if (contentDisposition == null)
{
throw new InvalidOperationException("Content-Disposition error");
}
return !string.IsNullOrEmpty(contentDisposition.FileName);
}
}
public class MultipartFileDataStream : MultipartFileData, IDisposable
{
/// <summary>
/// file content stream
/// </summary>
public Stream Stream { get; private set; }
public MultipartFileDataStream(HttpContentHeaders headers, string localFileName, Stream stream)
: base(headers, localFileName)
{
if (stream == null)
{
throw new ArgumentNullException("stream");
}
this.Stream = stream;
}
public void Dispose()
{
this.Stream.Dispose();
}
}
使用方式基本没变化，只是取Stream的地方有所调整
if (!Request.Content.IsMimeMultipartContent())
{
throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);
}
Dictionary<string, string> dic = new Dictionary<string, string>();
#region 原来使用MultipartFormDataStreamProvider的方式
//string root = HttpContext.Current.Server.MapPath("~/App_Data");//指定要将文件存入的服务器物理位置
//var provider = new MultipartFormDataStreamProvider(root);
#endregion
string root = AppDomain.CurrentDomain.BaseDirectory;
var provider = new MultipartFormDataMemoryStreamProvider();
try
{
// Read the form data.
await Request.Content.ReadAsMultipartAsync(provider);
// This illustrates how to get the file names.
foreach (MultipartFileData file in provider.FileData)
{//接收文件
Trace.WriteLine(file.Headers.ContentDisposition.FileName);//获取上传文件实际的文件名
Trace.WriteLine("Server file path: " + file.LocalFileName);//获取上传文件在服务上默认的文件名
var stream = ((MultipartFileDataStream)file).Stream;
using (StreamWriter sw = new StreamWriter(Path.Combine(root, file.Headers.ContentDisposition.FileName)))
{
stream.CopyTo(sw.BaseStream);
sw.Flush();
}
}
foreach (var key in provider.FormData.AllKeys)
{//接收FormData
dic.Add(key, provider.FormData[key]);
Console.WriteLine($"Key:{key} Value:{provider.FormData[key]}");
}
}
catch(Exception ex)
{
throw;
}
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原文链接：https://blog.csdn.net/starfd/article/details/53308651
