Я пытаюсь опубликовать файл на простой странице с элементом управления загрузкой файлов. Я использовал код отсюда: HttpWebRequest FileUpload вызывает OutOfMemoryException с некоторыми настройками для публикации файла .
Public Function uploadFile(ByVal containa As CookieContainer, ByVal uri As String, ByVal filePath As String, ByVal fileParameterName As String, ByVal contentType As String, ByVal otherParameters As Specialized.NameValueCollection, Optional UserName As String = "", Optional Password As String = "") As String
'https://stackoverflow.com/questions/4388689/vb-net-httpwebrequest-fileupload
Dim boundary As String = "---------------------------" & DateTime.Now.Ticks.ToString("x")
Dim newLine As String = System.Environment.NewLine
Dim boundaryBytes As Byte() = System.Text.Encoding.ASCII.GetBytes(newLine & "--" & boundary & newLine)
Dim request As Net.HttpWebRequest = Net.WebRequest.Create(uri)
'Set credentials
If UserName <> "" And Password <> "" Then
Dim NetworkCred As New Net.NetworkCredential(UserName, Password)
request.Credentials = NetworkCred
End If
request.ContentType = "multipart/form-data; boundary=" & boundary
request.Method = "POST"
request.CookieContainer = containa
request.AllowAutoRedirect = True
request.Timeout = -1
request.KeepAlive = True
request.AllowWriteStreamBuffering = True
Dim ms As New MemoryStream()
Dim formDataTemplate As String = "Content-Disposition: form-data; name=""{0}""{1}{1}{2}"
For Each key As String In otherParameters.Keys
ms.Write(boundaryBytes, 0, boundaryBytes.Length)
Dim formItem As String = String.Format(formDataTemplate, key, newLine, otherParameters(key))
Dim formItemBytes As Byte() = System.Text.Encoding.UTF8.GetBytes(formItem)
ms.Write(formItemBytes, 0, formItemBytes.Length)
Next key
ms.Write(boundaryBytes, 0, boundaryBytes.Length)
Dim headerTemplate As String = "Content-Disposition: form-data; name=""{0}""; filename=""{1}""{2}Content-Type: {3}{2}{2}"
Dim header As String = String.Format(headerTemplate, fileParameterName, filePath, newLine, contentType)
Dim headerBytes As Byte() = System.Text.Encoding.UTF8.GetBytes(header)
ms.Write(headerBytes, 0, headerBytes.Length)
Dim length As Long = ms.Length
length += New FileInfo(filePath).Length
request.ContentLength = length
Using requestStream As IO.Stream = request.GetRequestStream()
Dim bheader() As Byte = ms.ToArray()
requestStream.Write(bheader, 0, bheader.Length)
Using fileStream As New IO.FileStream(filePath, IO.FileMode.Open, IO.FileAccess.Read)
Dim buffer(4096) As Byte
Dim bytesRead As Int32 = fileStream.Read(buffer, 0, buffer.Length)
Do While (bytesRead > 0)
requestStream.Write(buffer, 0, bytesRead)
bytesRead = fileStream.Read(buffer, 0, buffer.Length)
Loop
End Using
requestStream.Close()
End Using
Dim response As Net.WebResponse = Nothing
Dim responseText = ""
Try
response = request.GetResponse()
Using responseStream As IO.Stream = response.GetResponseStream()
Using responseReader As New IO.StreamReader(responseStream)
responseText = responseReader.ReadToEnd()
End Using
End Using
Catch exception As Net.WebException
responseText = exception.Message
Finally
response.Close()
response = Nothing
request = Nothing
End Try
Return responseText
End Function
Для отладки процесса у меня есть простая форма загрузки UploadForm.aspx:
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="UploadForm.aspx.vb" Inherits="UploadForm" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Upload Test Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Literal runat="server" ID="litInfo" EnableViewState="false"></asp:Literal><br />
<asp:FileUpload runat="server" ID="fuFile" />
<asp:LinkButton runat="server" ID="btnUpload" Text="Upload"></asp:LinkButton>
</div>
</form>
</body>
</html>
UploadForm.aspx.vb
Imports System.Reflection
Partial Class UploadForm
Inherits System.Web.UI.Page
Protected Sub Page_Load(sender As Object, e As System.EventArgs) Handles Me.Load
If fuFile.HasFile Then
litInfo.Text &= "File Upload Control sees a file<br />"
Else
litInfo.Text &= "File Upload Control does NOT see a file<br />"
End If
litInfo.Text &= "File Upload Count: " & Request.Files.Count & "<br />"
If IsNothing(Request.InputStream) = False Then
Using responseReader As New IO.StreamReader(Request.InputStream)
litInfo.Text &= "<h3>Input Stream</h3>" & responseReader.ReadToEnd.Replace(vbCrLf, "<br />")
responseReader.Close()
End Using
End If
litInfo.Text &= "<h3>Request Properties</h3>" & ListProperties(Request).Replace(vbCrLf, "<br />")
litInfo.Text &= "<h3>Headers</h3>"
For Each Item As String In Request.Headers.Keys
litInfo.Text &= Item & ": " & Request.Headers(Item) & "<br />"
Next
End Sub
Function ListProperties(ByVal TheObject As Object) As String
Dim property_value As Object
Dim TypeInfo As Type = TheObject.GetType
Dim properties_info As PropertyInfo() = TypeInfo.GetProperties()
Dim ReturnBuilder As New System.Text.StringBuilder
For i As Integer = 0 To properties_info.Length - 1
With properties_info(i)
If .GetIndexParameters().Length = 0 Then
Try
property_value = .GetValue(TheObject, Nothing)
If property_value Is Nothing Then
ReturnBuilder.AppendLine(.Name & ": " & "Nothing")
Else
ReturnBuilder.AppendLine(.Name & ": " & property_value.ToString)
End If
Catch ex As Exception
ReturnBuilder.AppendLine(.Name & ": Error")
End Try
Else
ReturnBuilder.AppendLine(.Name & ": " & .PropertyType.ToString)
End If
End With
Next i
Return vbCrLf & ReturnBuilder.ToString
End Function
End Class
мой файл.csv
field1,field2,field3
1,2,3
4,5,6
7,8,9
Вызов выглядит так:
uploadFile(Ничего, "http://localhost:53239/TestSite/uploadform.aspx", "myfile.csv", "fuFile", "application/vnd.ms-excel", New NameValueCollection)
Он возвращает, что элемент управления загрузкой не видит файл, а входной поток видит. Я должен что-то упустить.
Я попытался загрузить страницу и проверил заголовки через FireBug, и опубликованные заголовки и данные выглядят одинаково.
Спасибо за любую помощь.
<input type="file" ..../>- person dotjoe schedule 24.03.2011