HttpWebRequest.Referer 属性
获取或设置 RefererHTTP 标头的值。
**命名空间:**System.Net
**程序集:**System（在 system.dll 中）
语法
声明
Public Property Referer As String
用法
Dim instance As HttpWebRequest
Dim value As String
value = instance.Referer
instance.Referer = value
public string Referer { get; set; }
public:
property String^ Referer {
String^ get ();
void set (String^ value);
}
/** @property */
public String get_Referer ()
/** @property */
public void set_Referer (String value)
public function get Referer () : String
public function set Referer (value : String)
属性值
RefererHTTP 标头的值。默认值为 空引用（在 Visual Basic 中为 Nothing）。
备注
如果 AllowAutoRedirect 属性为 true，则 Referer 属性在请求被重定向到另一个站点时自动设置。
若要清除 RefererHTTP 标头，请将 Referer 属性设置为 空引用（在 Visual Basic 中为 Nothing）。
提示
此属性的值存储在 WebHeaderCollection 中。如果设置了 WebHeaderCollection，则该属性值将丢失。
示例
下面的代码示例设置 Referer 属性。
' Create a 'HttpWebRequest' object.
Dim myHttpWebRequest As HttpWebRequest = CType(WebRequest.Create(myUri), HttpWebRequest)
' Referer property is set to https://www.microsoft.com
myHttpWebRequest.Referer = "https://www.microsoft.com"
' The response object of 'HttpWebRequest' is assigned to a 'HttpWebResponse' variable.
Dim myHttpWebResponse As HttpWebResponse = CType(myHttpWebRequest.GetResponse(), HttpWebResponse)
' Displaying the contents of the page to the console
Dim streamResponse As Stream = myHttpWebResponse.GetResponseStream()
Dim streamRead As New StreamReader(streamResponse)
Dim readBuffer(256) As [Char]
Dim count As Integer = streamRead.Read(readBuffer, 0, 256)
Console.WriteLine(ControlChars.Cr + "The contents of HTML page are.......")
While count > 0
Dim outputData As New [String](readBuffer, 0, count)
Console.Write(outputData)
count = streamRead.Read(readBuffer, 0, 256)
End While
Console.WriteLine(ControlChars.Cr + "HTTP Request Headers :" + ControlChars.Cr + ControlChars.Cr + "{0}", myHttpWebRequest.Headers)
Console.WriteLine(ControlChars.Cr + "HTTP Response Headers :" + ControlChars.Cr + ControlChars.Cr + "{0}", myHttpWebResponse.Headers)
' Release the response object resources.
streamRead.Close()
streamResponse.Close()
myHttpWebResponse.Close()
Console.WriteLine("Referer to the site is:{0}", myHttpWebRequest.Referer)
// Create a 'HttpWebRequest' object.
HttpWebRequest myHttpWebRequest=(HttpWebRequest)WebRequest.Create(myUri);
// Set referer property to https://www.microsoft.com .
myHttpWebRequest.Referer="https://www.microsoft.com";
// Assign the response object of 'HttpWebRequest' to a 'HttpWebResponse' variable.
HttpWebResponse myHttpWebResponse=(HttpWebResponse)myHttpWebRequest.GetResponse();
// Display the contents of the page to the console.
Stream streamResponse=myHttpWebResponse.GetResponseStream();
StreamReader streamRead = new StreamReader( streamResponse );
Char[] readBuffer = new Char[256];
int count = streamRead.Read( readBuffer, 0, 256 );
Console.WriteLine("\nThe contents of HTML page are.......");
while (count > 0)
{
String outputData = new String(readBuffer, 0, count);
Console.Write(outputData);
count = streamRead.Read(readBuffer, 0, 256);
}
Console.WriteLine("\nHTTP Request Headers :\n\n{0}",myHttpWebRequest.Headers);
Console.WriteLine("\nHTTP Response Headers :\n\n{0}",myHttpWebResponse.Headers);
streamRead.Close();
streamResponse.Close();
// Release the response object resources.
myHttpWebResponse.Close();
Console.WriteLine("Referer to the site is:{0}",myHttpWebRequest.Referer);
// Create a 'HttpWebRequest' object.
HttpWebRequest^ myHttpWebRequest = (HttpWebRequest^)( WebRequest::Create( myUri ) );
// Set referer property to https://www.microsoft.com .
myHttpWebRequest->Referer = "https://www.microsoft.com";
// Assign the response object of 'HttpWebRequest' to a 'HttpWebResponse' variable.
HttpWebResponse^ myHttpWebResponse = (HttpWebResponse^)( myHttpWebRequest->GetResponse() );
// Display the contents of the page to the console.
Stream^ streamResponse = myHttpWebResponse->GetResponseStream();
StreamReader^ streamRead = gcnew StreamReader( streamResponse );
array<Char>^ readBuffer = gcnew array<Char>(256);
int count = streamRead->Read( readBuffer, 0, 256 );
Console::WriteLine( "\nThe contents of HTML page are......." );
while ( count > 0 )
{
String^ outputData = gcnew String( readBuffer,0,count );
Console::Write( outputData );
count = streamRead->Read( readBuffer, 0, 256 );
}
Console::WriteLine( "\nHTTP Request Headers :\n\n {0}", myHttpWebRequest->Headers );
Console::WriteLine( "\nHTTP Response Headers :\n\n {0}", myHttpWebResponse->Headers );
streamRead->Close();
streamResponse->Close();
// Release the response object resources.
myHttpWebResponse->Close();
Console::WriteLine( "Referer to the site is: {0}", myHttpWebRequest->Referer );
// Create a 'HttpWebRequest' object.
HttpWebRequest myHttpWebRequest = (HttpWebRequest)
WebRequest.Create(myUri);
// Set referer property to https://www.microsoft.com.
myHttpWebRequest.set_Referer("https://www.microsoft.com");
// Assign the response object of 'HttpWebRequest' to a
//'HttpWebResponse' variable.
HttpWebResponse myHttpWebResponse = (HttpWebResponse)
myHttpWebRequest.GetResponse();
// Display the contents of the page to the console.
Stream streamResponse = myHttpWebResponse.GetResponseStream();
StreamReader streamRead = new StreamReader(streamResponse);
char readBuffer[] = new char[256];
int count = streamRead.Read(readBuffer, 0, 256);
Console.WriteLine("\nThe contents of HTML page are.......");
while (count > 0) {
String outputData = new String(readBuffer, 0, count);
Console.Write(outputData);
count = streamRead.Read(readBuffer, 0, 256);
}
Console.WriteLine("\nHTTP Request Headers :\n\n{0}",
myHttpWebRequest.get_Headers());
Console.WriteLine("\nHTTP Response Headers :\n\n{0}",
myHttpWebResponse.get_Headers());
streamRead.Close();
streamResponse.Close();
// Release the response object resources.
myHttpWebResponse.Close();
Console.WriteLine("Referer to the site is:{0}",
myHttpWebRequest.get_Referer());
平台
Windows 98、Windows 2000 SP4、Windows CE、Windows Millennium Edition、Windows Mobile for Pocket PC、Windows Mobile for Smartphone、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition
.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。
版本信息
.NET Framework
受以下版本支持：2.0、1.1、1.0
.NET Compact Framework
受以下版本支持：2.0、1.0