如何在C＃中读取图像和文本值？ [英] How to read an image and text value in C#?

问题描述

正如您所看到的，我正尝试通过POST命令发送图像和名称到本地功能。

如何在C＃中读取这两个参数？

这是我试过的，但它只能读取文件图像。

$ p $ [FunctionName（Test）]
public static async Task< HttpResponseMessage>
Run（[HttpTrigger（AuthorizationLevel.Anonymous，get，post，Route =
null）] HttpRequestMessage req，TraceWriter log）
{
//检查请求包含多部分/表单数据。
if（！req.Content.IsMimeMultipartContent（））
{
return req.CreateResponse（HttpStatusCode.UnsupportedMediaType）;



foreach（contents.Contents中的var流）
{


try
{
var fileBytes =等待stream.ReadAsByteArrayAsync（）;
var fileinfo = new FileInfo（stream.Headers.ContentDisposition.FileName.Trim（'''））;



//可以读取像这样的文件图像。



catch（Exception e）
{
return req.CreateErrorResponse（HttpStatusCode.Conflict，e）;
}


解决方案

按照你的要求，我认为你可以使用 b msdn.microsoft.com/en-us/library/hh944544(v=vs.118).aspxrel =nofollow noreferrer> HttpContentMultipartExtensions.ReadAsMultipartAsync ，您将获得 MultipartMemoryStreamProvider ，那么你可以利用下面的代码来读取你上传的文件：

  var multipartMemoryStreamProvider = await req。 Content.ReadAsMultipartAsync（）; 
 foreach（Htt在multipartMemoryStreamProvider.Contents中的pContent内容）
 {
 //用于读取上传的文件
 var filename = content.Headers.ContentDisposition.FileName.Trim（'''）; 
 var stream =等待content.ReadAsStreamAsync（）; 
 
 //对于formdata，你可以检查'content.Headers.ContentDisposition.FileName`是否为空
 log.Info（$name = {content.Headers.ContentDisposition.Name}， value = {await content.ReadAsStringAsync（）}）; 
} 
  

此外，您可以按照 issue ，基于 MultipartMemoryStreamProvider创建您的自定义MultipartFormDataMemoryStreamProvider 。关于建立自定义的问题 InMemoryMultipartFormDataStreamProvider基于 MultipartStreamProvider 。

As you can see, I am trying to send an image, and a name through a POST command to a local function.

How Can I read both of these parameters in C#?

This is what I have tried but It can only read File Image.

   [FunctionName("Test")]
public static async Task<HttpResponseMessage> 
     Run([HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = 
 null)]HttpRequestMessage req, TraceWriter log)
{
    //Check if the request contains multipart/form-data.
    if (!req.Content.IsMimeMultipartContent())
    {
        return req.CreateResponse(HttpStatusCode.UnsupportedMediaType);
    }


  foreach (var stream in contents.Contents)
    {


        try
        {
            var fileBytes = await stream.ReadAsByteArrayAsync();
            var fileinfo = new FileInfo(stream.Headers.ContentDisposition.FileName.Trim('"'));



         //Can Read File image like this.


        }
        catch(Exception e)
        {
            return req.CreateErrorResponse(HttpStatusCode.Conflict, e);
        }

解决方案

Is there a workaround to do this like using memory stream?

According to your requirement, I assumed that you could use HttpContentMultipartExtensions.ReadAsMultipartAsync and you would get the MultipartMemoryStreamProvider, then you could leverage the following code for reading your uploaded files:

var multipartMemoryStreamProvider= await req.Content.ReadAsMultipartAsync();
foreach (HttpContent content in multipartMemoryStreamProvider.Contents)
{  
   // for reading the uploaded file
   var filename= content.Headers.ContentDisposition.FileName.Trim('"');
   var stream=await content.ReadAsStreamAsync();          

   //for formdata, you could check whether `content.Headers.ContentDisposition.FileName` is empty
   log.Info($"name={content.Headers.ContentDisposition.Name},value={await content.ReadAsStringAsync()}");
}

Moreover, you could follow this issue about creating your custom MultipartFormDataMemoryStreamProvider based on MultipartMemoryStreamProvider. And this issue about building custom InMemoryMultipartFormDataStreamProvider based on MultipartStreamProvider.

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