使用web api读取multipartformdatacontent [英] Read multipartformdatacontent using web api

问题描述

嗨伙计们



这是我第一次使用

hi guys

this is my first time using a

MultipartFormDataContent

i知道一些基本的如何使用它，但问题

是我不知道如何从API读取它一旦发送。



please检查下面的代码不完整，因为即时开始构建它。



我尝试过：

i know some basic how to use it but the problem
is i don't know how to read it from API once sent.

please check my code below not complete because im starting to build it.

What I have tried:

<pre lang="c#">
var fileStream = File.Open(file, FileMode.Open);
var fileInfo = new FileInfo(file);

var content = new MultipartFormDataContent();
content.Add(new StreamContent(fileStream), "\"file\"", string.Format("\"{0}\"", fileInfo.Name));
content.Add(new StringContent("some text"), "textname");
content.Add(new StringContent("some text2"), "textname2");

说明：

第一内容：添加文件（流式传输）

第二和第三内容：一些文字



现在我的问题我怎么能从API读取。



提前谢谢。 ：）

EXPLANATION:
First content: adding file (streamed)
second and 3rd content: some text

now my question how can i read it from API.

Thank you in advance. :)

推荐答案

在代码中查看注释/说明中的注释。

See comments within code for notes/clarifications.

[HttpPost]
// I use attribute based routing so thats what this attribute below is for
[Route("documents/upload")]
public async Task<IHttpActionResult> UploadDocument()
{
	//Error checking here to require multi part for form uploads
	if (!Request.Content.IsMimeMultipartContent())
	{
		return BadRequest(string.Format(@"Media type is unsupported for file upload"));
	}

	//In your API project you should have a /Content directory, this is a directory under /Content called uploads. You can name whatever you want here as long as
	//  the directory exists
	string root = HttpContext.Current.Server.MapPath("~/Content/Uploads");
	System.IO.Directory.CreateDirectory(root);
	var provider = new MultipartFormDataStreamProvider(root);

	// This is how you would get any variables, other than your file, that came along with your upload. In your example you had textname and textname2. Below is how you
	//  could go about retrieving those values
	var yourTextNameVariableInYourQuestion = provider.FormData.GetValues("textname").Select(m => m).FirstOrDefault();
	
	 await Request.Content.ReadAsMultipartAsync(provider);

	foreach (var file in provider.FileData)
	{
		FileInfo fileInfo = new FileInfo(file.LocalFileName);

		if (fileInfo.Length != 0)
		{
		    // Pretty self explanatory. I rename the file that is uploaded to something else, web api defaults the names to something like body_part****** so when I upload
			//   files in web api I go ahead and rename it to what the uploaded file name was.
			string newFileName = file.LocalFileName +
								 Path.GetExtension(
									 file.Headers.ContentDisposition.FileName
										 .Replace("\"", string.Empty)
										 .Replace(@"\", string.Empty));

			global::System.IO.File.Move(file.LocalFileName, newFileName);

		}
	}

	// This has no error catching or anything so if something dies in the above, this will explode. Include proper error handling as you see fit
	return Ok();
}

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