Asp.Net Web APIでコンポジット要求を受け入れる方法

Question

設定済みのASP.NET Web APIエンドポイントに送信されているPOSTがあります。受信リクエストを記録しましたが、次のようになります。

Host: somedomain.net 
User-Agent: Jakarta; Commons-HttpClient/3.0.1 
--7ZRj4zj5nzTkWtBlwkO5Y4Il-En_uTGP2enCIMn 
Content-Disposition: form-data; name="companyId" 
Content-Type: text/plain; charset=US-ASCII 
Content-Transfer-Encoding: 8bit 

985 
--7ZRj4zj5nzTkWtBlwkO5Y4Il-En_uTGP2enCIMn 
Content-Disposition: form-data; name="inputFormData" 
Content-Type: text/plain; charset=US-ASCII 
Content-Transfer-Encoding: 8bit 

<?xml version="1.0" encoding="UTF-8" standalone="yes"?><response>Response XML Data</response> 
--7ZRj4zj5nzTkWtBlwkO5Y4Il-En_uTGP2enCIMn 
Content-Disposition: form-data; name="completedAgreement"; filename="48ce7fa4079790440a964815a744d232.zip" 
Content-Type: application/octet-stream; charset=ISO-8859-1 
Content-Transfer-Encoding: binary 

PK 

これを認識するためのASP.NETの取得方法はわかりません。私はパラメータとして名前を使用しようとしました、そして、彼らはnullです。

別の会社がPOSTを制御するので、送信方法を変更できません。

Answer 1

データをフォームデータとファイルに分割するためにMultipartStreamProviderを作成する必要がありました。

/// <summary> 
    /// Splits a multipart form post that has form data and files 
    /// </summary> 
    public class InMemoryMultipartFormDataStreamProvider : MultipartStreamProvider 
    { 
     private NameValueCollection _formData = new NameValueCollection(); 
     private List<HttpContent> _fileContents = new List<HttpContent>(); 

     // Set of indexes of which HttpContents we designate as form data 
     private Collection<bool> _isFormData = new Collection<bool>(); 

     /// <summary> 
     /// Gets a <see cref="NameValueCollection"/> of form data passed as part of the multipart form data. 
     /// </summary> 
     public NameValueCollection FormData 
     { 
      get { return _formData; } 
     } 

     /// <summary> 
     /// Gets list of <see cref="HttpContent"/>s which contain uploaded files as in-memory representation. 
     /// </summary> 
     public List<HttpContent> Files 
     { 
      get { return _fileContents; } 
     } 

     public override Stream GetStream(HttpContent parent, HttpContentHeaders headers) 
     { 
      // For form data, Content-Disposition header is a requirement 
      ContentDispositionHeaderValue contentDisposition = headers.ContentDisposition; 
      if (contentDisposition != null) 
      { 
       // We will post process this as form data 
       _isFormData.Add(String.IsNullOrEmpty(contentDisposition.FileName)); 

       return new MemoryStream(); 
      } 

      // If no Content-Disposition header was present. 
      throw new InvalidOperationException(string.Format("Did not find required '{0}' header field in MIME multipart body part..", "Content-Disposition")); 
     } 

     /// <summary> 
     /// Read the non-file contents as form data. 
     /// </summary> 
     /// <returns></returns> 
     public override async Task ExecutePostProcessingAsync() 
     { 
      // Find instances of non-file HttpContents and read them asynchronously 
      // to get the string content and then add that as form data 
      for (int index = 0; index < Contents.Count; index++) 
      { 
       if (_isFormData[index]) 
       { 
        HttpContent formContent = Contents[index]; 
        // Extract name from Content-Disposition header. We know from earlier that the header is present. 
        ContentDispositionHeaderValue contentDisposition = formContent.Headers.ContentDisposition; 
        string formFieldName = UnquoteToken(contentDisposition.Name) ?? String.Empty; 

        // Read the contents as string data and add to form data 
        string formFieldValue = await formContent.ReadAsStringAsync(); 
        FormData.Add(formFieldName, formFieldValue); 
       } 
       else 
       { 
        _fileContents.Add(Contents[index]); 
       } 
      } 
     } 

     /// <summary> 
     /// Remove bounding quotes on a token if present 
     /// </summary> 
     /// <param name="token">Token to unquote.</param> 
     /// <returns>Unquoted token.</returns> 
     private static string UnquoteToken(string token) 
     { 
      if (String.IsNullOrWhiteSpace(token)) 
      { 
       return token; 
      } 

      if (token.StartsWith("\"", StringComparison.Ordinal) && token.EndsWith("\"", StringComparison.Ordinal) && token.Length > 1) 
      { 
       return token.Substring(1, token.Length - 2); 
      } 

      return token; 
     } 
    } 

次に、プロバイダを使用してコントローラ上のファイルを取得するだけです。

[HttpPost] 
    public async Task<IHttpActionResult> Post() 
    { 
     // get the form data posted and split the content into form data and files 
     var provider = await Request.Content.ReadAsMultipartAsync(new InMemoryMultipartFormDataStreamProvider()); 

     // access form data 
     NameValueCollection formData = provider.FormData; 
     List<HttpContent> files = provider.Files; 

     // Do something with files and form data 

     return Ok(); 
    }