FileWebRequest.GetResponse 方法

定義

命名空間:

System.Net

組件:

netstandard.dll, System.Net.Requests.dll

來源:

FileWebRequest.cs

傳回對檔案系統要求的回應。

C#

public override System.Net.WebResponse GetResponse();

傳回

WebResponse

WebResponse，包含來自檔案系統資源的回應。

例外狀況

WebException

要求逾時。

範例

下列程式代碼範例會 GetResponse 使用 方法來傳回檔系統要求回應。

C#

//
// This example shows how to use the FileWebRequest.GetResponse method
// to read and display the contents of a file passed by the user.
// Note.  For this program to work, the folder containing the test file
// must be shared, with its permissions set to allow read access.

using System;
using System.Net;
using System.IO;

namespace Mssc.PluggableProtocols.File
{

  class TestGetResponse
  {
    private static FileWebResponse myFileWebResponse;

    private static void showUsage()
    {
      Console.WriteLine("\nPlease enter file name:");
      Console.WriteLine("Usage: cs_getresponse <systemname>/<sharedfoldername>/<filename>");
    }

    private static bool makeFileRequest(string fileName)
    {
      bool requestOk = false;
      try
      {
        Uri myUrl = new Uri("file://" + fileName);

        // Create a FileWebRequest object using the passed URI.
        FileWebRequest myFileWebRequest = (FileWebRequest)WebRequest.Create(myUrl);

        // Get the FileWebResponse object.
        myFileWebResponse =(FileWebResponse)myFileWebRequest.GetResponse();

        requestOk = true;
      }
      catch(WebException e)
      {
        Console.WriteLine("WebException: "+e.Message);
      }
      catch(UriFormatException e)
      {
        Console.WriteLine("UriFormatWebException: "+e.Message);
      }

      return requestOk;
    }

    private static void readFile()
    {
      try
      {
        // Create the file stream.
        Stream receiveStream=myFileWebResponse.GetResponseStream();

        // Create a reader object to read the file content.
        StreamReader readStream = new StreamReader( receiveStream );

        // Create a local buffer for a temporary storage of the
        // read data.
        char[] readBuffer = new Char[256];

        // Read the first 256 bytes.
        int count = readStream.Read( readBuffer, 0, 256 );

        Console.WriteLine("The file content is:");
        Console.WriteLine("");

        // Loop to read the remaining data in blocks of 256 bytes
        // and display the data on the console.
        while (count > 0)
        {
          String str = new String(readBuffer, 0, count);
          Console.WriteLine(str+"\n");
          count = readStream.Read(readBuffer, 0, 256);
        }

        readStream.Close();

        // Release the response object resources.
        myFileWebResponse.Close();
      }
      catch(WebException e)
      {
        Console.WriteLine("The WebException: "+e.Message);
      }
      catch(UriFormatException e)
      {
        Console.WriteLine("The UriFormatException: "+e.Message);
      }
    }

    static void Main(string[] args)
    {

      if (args.Length < 1)
            {
                showUsage();
            }
            else
      {
        if (makeFileRequest(args[0]))
          readFile();
      }
    }
  }
}

備註

方法會 GetResponse 傳 WebResponse 回 物件，其中包含來自文件系統資源的回應。

方法GetResponse會提供 同步存取 。WebResponse 針對異步存取，請使用 BeginGetResponse 和 EndGetResponse 方法。

適用於