如何在c＃中使用httpwebrequest获取网页（使用ajax/javascript的php）的最终响应

Question

我正在使用c＃windows应用程序。我有一个使用javascript/ajax验证登录并返回一些数据的php文件。当我在浏览器中执行它时，它工作正常，但是当我通过httpwebrequest从c＃windows应用程序发送数据时，它不会返回完整的响应。提交浏览器数据后，c＃没有得到响应。

请帮助我。

下面是我的代码

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script> 
<script type="text/javascript"> 
function Ajaxcall(){  
$.ajax({   
url: "XXXXXXXX", // this url is a moodle url and validate user authentication then returns roleid 
type: "POST", 
async:true,  
data: {username: uname, password: pwd, TransactionId: TransactionId}, 
error: function (data) 
{ 
document.write("Error");    
}, 
success: function(response) 
{      
var url = 'login.php'; 
var form = $('<form action="' + url + '" method="post">' + 
'<input type="text" name="RoleId" value="' + response + '" />' 
'<input type="text" name="TransactionId" value="' + TransactionId + '" />' 
'</form>'); 
$('body').append(form); 
form.submit(); 
} 
}); 
} 
<?php 
//The below code will automatically execute after form submission 
if (isset($_POST["RoleId"])) 
{    
$NewRoleId = $_POST["RoleId"]; 
$TransactionId = $_POST["TransactionId"]; 
$qry = "Update query is to update roleid in a table based on the transactionid";     
$result = mysql_query($qry); 
if ($result) 
echo "Updated successfully"; 
else 
echo "Error in updating query"; 
exit(); 
} 

'The below code runs when the page is loading and gets trnsactionid from the 'c# 
if (isset($_POST['TransactionId'])) 
{    
    $qry = "select query returns username, password"; 
    echo "query:". $qry; 
    $result = mysql_query($qry); 

    if (mysql_num_rows($result) > 0) 
    { 
     $rows = mysql_fetch_array($result);     
     echo "<script type='text/javascript'>var uname = '" . $rows["username"] . "', pwd = '" . $rows["password"] . "', TransactionId='" . $_POST['TransactionId'] . "';</script>"; 
     echo "<script language='JavaScript'>Ajaxcall(callbackfunction); </script>";     
    } 
} 
?> 

C＃代码发布数据：

String response = GetPost("XXXXX/Login.php", "TransactionId", "1") 

public string GetPost(string Url, params string[] postdata) 
{ 
    string result = string.Empty; 
    string data = string.Empty; 

    System.Text.ASCIIEncoding ascii = new ASCIIEncoding(); 

    if (postdata.Length % 2 != 0) 
    { 
     MessageBox.Show("Parameters must be even , \"user\" , \"value\" , ... etc", Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Error); 
     return string.Empty; 
    } 

    for (int i = 0; i < postdata.Length; i += 2) 
    { 
     data += string.Format("&{0}={1}", postdata[i], postdata[i + 1]); 
    } 

    data = data.Remove(0, 1); 

    byte[] bytesarr = ascii.GetBytes(data); 

    try 
    { 
     WebRequest request = WebRequest.Create(Url); 
     request.Method = "POST"; 
     request.ContentType = "application/x-www-form-urlencoded"; 
     request.ContentLength = bytesarr.Length; 

     System.IO.Stream streamwriter = request.GetRequestStream(); 
     streamwriter.Write(bytesarr, 0, bytesarr.Length); 
     streamwriter.Close(); 

     WebResponse response = request.GetResponse(); 
     streamwriter = response.GetResponseStream(); 

     System.IO.StreamReader streamread = new System.IO.StreamReader(streamwriter); 
     result = streamread.ReadToEnd(); 

     streamread.Close(); 
    } 
    catch (Exception ex) 
    { 
     MessageBox.Show(ex.Message, Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Error); 
    } 

    return result; 
} 

Answer 1

尝试添加header()功能指定响应手动