Question

我是.NET的新手，我想要類似CURLFile但在C＃或VB.NET中。 在PHP中，我們使用這個：

$post_fields = array(
    'id' => $id, 
    'document' => new CURLFile(realpath("ufile/data.txt")), 
    'caption' => $caption 
); 
$url = 'https://www.example.com/gdata/'; 

function makeCurl($method, $datas) 
{ 
    global $url; 
    $ch = curl_init($url . $method); 
    curl_setopt($ch, CURLOPT_POST, 1); 
    curl_setopt($ch, CURLOPT_POSTFIELDS, $datas); 
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); 
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false); 
    $server_output = curl_exec($ch); 
    echo $server_output; 
    curl_close($ch); 
    return $server_output; 
} 
makeCurl("sendingFile", $post_fields); 

如何發送文件內容與其他參數一樣，在C＃或VB.NET？

UPDATE： 按照@MrGadget評論： 我沒有關於接收side.Only信息多的信息，我已經是那面期望「的multipart/form-data的」和唯一的反應是「OK」或「錯誤的請求」。使用上面的PHP代碼，我們總是可以「OK」。現在我們調用WebRequest.Create來調用帶有上面代碼的php文件來發送文件。我只是嘗試在.Net中通過調用php。

Answer 1

我找到了this ...沒有測試或完善......看看你是否可以用它做點什麼。

VB代碼：

Imports System.Security.Cryptography 
Imports System.Collections.Specialized 
Imports System.IO 

Public Shared Sub HttpUploadFile(url As String, file As String, paramName As String, contentType As String, nvc As NameValueCollection) 
    Dim boundary As String = "---------------------------" + DateTime.Now.Ticks.ToString("x") 
    Dim boundarybytes As Byte() = Text.Encoding.ASCII.GetBytes((Convert.ToString(vbCr & vbLf & "--") & boundary) + vbCr & vbLf) 

    Dim wr As HttpWebRequest = DirectCast(WebRequest.Create(url), HttpWebRequest) 
    wr.ContentType = Convert.ToString("multipart/form-data; boundary=") & boundary 
    wr.Method = "POST" 
    wr.KeepAlive = True 
    wr.Credentials = Net.CredentialCache.DefaultCredentials 

    Dim rs As Stream = wr.GetRequestStream() 

    Dim formdataTemplate As String = "Content-Disposition: form-data; name=""{0}""" & vbCrLf & vbCrLf & "{1}" 
    For Each key As String In nvc.Keys 
     rs.Write(boundarybytes, 0, boundarybytes.Length) 
     Dim formitem As String = String.Format(formdataTemplate, key, nvc(key)) 
     Dim formitembytes As Byte() = Text.Encoding.UTF8.GetBytes(formitem) 
     rs.Write(formitembytes, 0, formitembytes.Length) 
    Next 
    rs.Write(boundarybytes, 0, boundarybytes.Length) 

    Dim headerTemplate As String = "Content-Disposition: form-data; name=""{0}""; filename=""{1}""" & vbCrLf & "Content-Type: {2}" & vbCrLf & vbCrLf 
    Dim header As String = String.Format(headerTemplate, paramName, file, contentType) 
    Dim headerbytes As Byte() = Text.Encoding.UTF8.GetBytes(header) 
    rs.Write(headerbytes, 0, headerbytes.Length) 

    Dim fileStream As New FileStream(file, FileMode.Open, FileAccess.Read) 
    Dim buffer As Byte() = New Byte(4095) {} 
    Dim bytesRead As Integer = 0 
    While (InlineAssignHelper(bytesRead, fileStream.Read(buffer, 0, buffer.Length))) <> 0 
     rs.Write(buffer, 0, bytesRead) 
    End While 
    fileStream.Close() 

    Dim trailer As Byte() = Text.Encoding.ASCII.GetBytes((Convert.ToString(vbCrLf & "--") & boundary) + "--" & vbCrLf) 
    rs.Write(trailer, 0, trailer.Length) 
    rs.Close() 

    Dim wresp As WebResponse = Nothing 
    Try 
     wresp = wr.GetResponse() 
     Dim stream2 As Stream = wresp.GetResponseStream() 

     Dim reader2 As New StreamReader(stream2) 
    Catch ex As Exception 

     If wresp IsNot Nothing Then 
      wresp.Close() 
      wresp = Nothing 
     End If 
    Finally 
     wr = Nothing 
    End Try 
End Sub 

Private Shared Function InlineAssignHelper(Of T)(ByRef target As T, ByVal value As T) As T 
    target = value 
    Return value 
End Function 

原始C＃代碼：

public static void HttpUploadFile(string url, string file, string paramName, string contentType, NameValueCollection nvc) { 
    string boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x"); 
    byte[] boundarybytes = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n"); 

    HttpWebRequest wr = (HttpWebRequest)WebRequest.Create(url); 
    wr.ContentType = "multipart/form-data; boundary=" + boundary; 
    wr.Method = "POST"; 
    wr.KeepAlive = true; 
    wr.Credentials = System.Net.CredentialCache.DefaultCredentials; 

    Stream rs = wr.GetRequestStream(); 

    string formdataTemplate = "Content-Disposition: form-data; name=\"{0}\"\r\n\r\n{1}"; 
    foreach (string key in nvc.Keys) 
    { 
     rs.Write(boundarybytes, 0, boundarybytes.Length); 
     string formitem = string.Format(formdataTemplate, key, nvc[key]); 
     byte[] formitembytes = System.Text.Encoding.UTF8.GetBytes(formitem); 
     rs.Write(formitembytes, 0, formitembytes.Length); 
    } 
    rs.Write(boundarybytes, 0, boundarybytes.Length); 

    string headerTemplate = "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: {2}\r\n\r\n"; 
    string header = string.Format(headerTemplate, paramName, file, contentType); 
    byte[] headerbytes = System.Text.Encoding.UTF8.GetBytes(header); 
    rs.Write(headerbytes, 0, headerbytes.Length); 

    FileStream fileStream = new FileStream(file, FileMode.Open, FileAccess.Read); 
    byte[] buffer = new byte[4096]; 
    int bytesRead = 0; 
    while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0) { 
     rs.Write(buffer, 0, bytesRead); 
    } 
    fileStream.Close(); 

    byte[] trailer = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "--\r\n"); 
    rs.Write(trailer, 0, trailer.Length); 
    rs.Close(); 

    WebResponse wresp = null; 
    try { 
     wresp = wr.GetResponse(); 
     Stream stream2 = wresp.GetResponseStream(); 
     StreamReader reader2 = new StreamReader(stream2); 

    } catch(Exception ex) { 

     if(wresp != null) { 
      wresp.Close(); 
      wresp = null; 
     } 
    } finally { 
     wr = null; 
    } 
}