Question

我是.NET的新手，我想要类似CURLFile但在C＃或VB.NET中。 在PHP中，我们使用这个：

$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); 

如何发送文件内容与其他参数一样，在C＃或VB.NET？

UPDATE： 按照@MrGadget评论： 我没有关于接收side.Only信息多的信息，我已经是那面期望“的multipart/form-data的”和唯一的反应是“OK”或“错误的请求”。使用上面的PHP代码，我们总是可以“OK”。现在我们调用WebRequest.Create来调用带有上面代码的php文件来发送文件。我只是尝试在.Net中通过调用php。

Answer 1

我找到了this ...没有测试或完善......看看你是否可以用它做点什么。

VB代码：

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＃代码：

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; 
    } 
}