HttpListenerResponse.ContentLength64 属性
定义
获取或设置响应中包括的正文数据的字节数。Gets or sets the number of bytes in the body data included in the response.
public:
property long ContentLength64 { long get(); void set(long value); };
public long ContentLength64 { get; set; }
member this.ContentLength64 : int64 with get, set
Public Property ContentLength64 As Long
属性值
响应的 Content-Length 标头的值。The value of the response's Content-Length header.
例外
为设置操作指定的值小于 0。The value specified for a set operation is less than zero.
响应已发送。The response is already being sent.
此对象已关闭。This object is closed.
示例
下面的代码示例演示如何设置此属性的值。The following code example demonstrates setting the value of this property.
// This example requires the System and System.Net namespaces.
public static void SimpleListenerExample(string[] prefixes)
{
if (!HttpListener.IsSupported)
{
Console.WriteLine ("Windows XP SP2 or Server 2003 is required to use the HttpListener class.");
return;
}
// URI prefixes are required,
// for example "http://contoso.com:8080/index/".
if (prefixes == null || prefixes.Length == 0)
throw new ArgumentException("prefixes");
// Create a listener.
HttpListener listener = new HttpListener();
// Add the prefixes.
foreach (string s in prefixes)
{
listener.Prefixes.Add(s);
}
listener.Start();
Console.WriteLine("Listening...");
// Note: The GetContext method blocks while waiting for a request.
HttpListenerContext context = listener.GetContext();
HttpListenerRequest request = context.Request;
// Obtain a response object.
HttpListenerResponse response = context.Response;
// Construct a response.
string responseString = "<HTML><BODY> Hello world!</BODY></HTML>";
byte[] buffer = System.Text.Encoding.UTF8.GetBytes(responseString);
// Get a response stream and write the response to it.
response.ContentLength64 = buffer.Length;
System.IO.Stream output = response.OutputStream;
output.Write(buffer,0,buffer.Length);
// You must close the output stream.
output.Close();
listener.Stop();
}
Public Shared Sub SimpleListenerExample(prefixes As String())
If Not HttpListener.IsSupported Then
Console.WriteLine("Windows XP SP2 or Server 2003 is required to use the HttpListener class.")
Return
End If
' URI prefixes are required,
' for example "http://contoso.com:8080/index/".
If prefixes Is Nothing Or prefixes.Length = 0 Then
Throw New ArgumentException("prefixes")
End If
' Create a listener
Dim listener = New HttpListener()
For Each s As String In prefixes
listener.Prefixes.Add(s)
Next
listener.Start()
Console.WriteLine("Listening...")
' Note: The GetContext method blocks while waiting for a request.
Dim context As HttpListenerContext = listener.GetContext()
Console.WriteLine("Listening...")
' Obtain a response object
Dim request As HttpListenerRequest = context.Request
' Construct a response.
Dim response As HttpListenerResponse = context.Response
Dim responseString As String = "<HTML><BODY> Hello world!</BODY></HTML>"
Dim buffer As Byte() = System.Text.Encoding.UTF8.GetBytes(responseString)
' Get a response stream and write the response to it.
response.ContentLength64 = buffer.Length
Dim output As System.IO.Stream = response.OutputStream
output.Write(buffer, 0, buffer.Length)
'You must close the output stream.
output.Close()
listener.Stop()
End Sub
注解
Content-Length标头表示响应的正文数据的长度(以字节为单位)。The Content-Length header expresses the length, in bytes, of the response's body data. 当使用不发送数据块或原始格式的格式时,必须设置 ContentLength64 属性。When using a format that does not send the data chunked or raw, you must set the ContentLength64 property. 否则,不 HttpListener 会发送响应数据。If you do not, the HttpListener does not send the response data.
有关响应标头的完整列表,请参见 HttpResponseHeader 枚举。For a complete list of response headers, see the HttpResponseHeader enumeration.