Question

我是.NET新手，我想要CURLFile之类的东西，但是在C＃或VB.NET中。在PHP中我们使用：

$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);

如何使用C＃或VB.NET中的其他参数发送文件内容？

更新： 根据@MrGadget评论：我没有太多关于接收方的信息。我只有这方面的信息是期望＆＃34; multipart / form-data＆＃34;唯一的反应是＆＃34; ok＆＃34;或者＆＃34;糟糕的请求＆＃34;。使用上面的PHP代码，我们总能得到＆＃34; ok＆＃34;。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中进行操作并通过调用php。

Answer 1

我发现this ...没有经过测试或改进......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;
    }
}

像ASP.NET中的PHP CURLFile之类的东西

1 个答案: