FtpWebRequest.Timeout 属性
定义
重要
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获取或设置等待请求的毫秒数。
public:
virtual property int Timeout { int get(); void set(int value); };public override int Timeout { get; set; }member this.Timeout : int with get, setPublic Overrides Property Timeout As Integer属性值
一个 Int32 值，该值包含请求超时前等待的毫秒数。默认值 Infinite为 。
例外
指定的值是小于零，且不是 Infinite。
对于一个已在进行的请求为此属性指定了一个新值。
示例
下面的代码示例设置此属性。
static bool UploadUniqueFileOnServer( Uri^ serverUri, String^ fileName )
{
// The URI described by serverUri should use the ftp:// scheme.
// It contains the name of the directory on the server.
// Example: ftp://contoso.com.
//
// The fileName parameter identifies the file containing the data to be uploaded.
if ( serverUri->Scheme != Uri::UriSchemeFtp )
{
return false;
}
// Get the object used to communicate with the server.
FtpWebRequest^ request = dynamic_cast<FtpWebRequest^>(WebRequest::Create( serverUri ));
request->Method = WebRequestMethods::Ftp::UploadFileWithUniqueName;
// Don't set a time limit for the operation to complete.
request->Timeout = System::Threading::Timeout::Infinite;
// Copy the file contents to the request stream.
const int bufferLength = 2048;
array<Byte>^buffer = gcnew array<Byte>(bufferLength);
int count = 0;
int readBytes = 0;
FileStream^ stream = File::OpenRead( fileName );
Stream^ requestStream = request->GetRequestStream();
do
{
readBytes = stream->Read( buffer, 0, bufferLength );
requestStream->Write( buffer, 0, bufferLength );
count += readBytes;
}
while ( readBytes != 0 );
Console::WriteLine( "Writing {0} bytes to the stream.", count );
// IMPORTANT: Close the request stream before sending the request.
requestStream->Close();
FtpWebResponse^ response = dynamic_cast<FtpWebResponse^>(request->GetResponse());
Console::WriteLine( "Upload status: {0}, {1}", response->StatusCode, response->StatusDescription );
Console::WriteLine( "File name: {0}", response->ResponseUri );
response->Close();
return true;
}
public static bool UploadUniqueFileOnServer (Uri serverUri, string fileName)
{
// The URI described by serverUri should use the ftp:// scheme.
// It contains the name of the directory on the server.
// Example: ftp://contoso.com.
//
// The fileName parameter identifies the file containing the data to be uploaded.
if (serverUri.Scheme != Uri.UriSchemeFtp)
{
return false;
}
// Get the object used to communicate with the server.
FtpWebRequest request = (FtpWebRequest)WebRequest.Create(serverUri);
request.Method = WebRequestMethods.Ftp.UploadFileWithUniqueName;
// Set a time limit for the operation to complete.
request.Timeout = 600000;
// Copy the file contents to the request stream.
const int bufferLength = 2048;
byte[] buffer = new byte[bufferLength];
int count = 0;
int readBytes = 0;
FileStream stream = File.OpenRead(fileName);
Stream requestStream = request.GetRequestStream();
do
{
readBytes = stream.Read(buffer, 0, bufferLength);
requestStream.Write(buffer, 0, bufferLength);
count += readBytes;
}
while (readBytes != 0);
Console.WriteLine ("Writing {0} bytes to the stream.", count);
// IMPORTANT: Close the request stream before sending the request.
requestStream.Close();
FtpWebResponse response = (FtpWebResponse) request.GetResponse();
Console.WriteLine("Upload status: {0}, {1}",response.StatusCode, response.StatusDescription);
Console.WriteLine ("File name: {0}", response.ResponseUri);
response.Close();
return true;
}
注解
若要指定无限值，请将 Timeout 属性设置为 Infinite (-1) 。 这是默认值。
Timeout 是使用 GetResponse 方法发出的同步请求等待响应和 GetRequestStream 方法等待流的毫秒数。 如果资源在超时期限内未响应，则请求将引发 ， WebException 并将 Status 属性设置为 Timeout。
调用 、、 或 方法后更改Timeout会导致InvalidOperationException异常。BeginGetResponseGetResponseBeginGetRequestStreamGetRequestStream
域名系统 (DNS) 查询可能需要长达 15 秒才能返回或超时。如果请求包含需要解析的主机名，并且你设置为 Timeout 小于 15 秒的值，则可能需要 15 秒或更多时间才能 WebException 引发 来指示请求超时。
