CredentialCache.GetCredential 方法

參考

定義

命名空間:: System.Net

組件:: System.Net.Primitives.dll

組件:: System.dll

組件:: netstandard.dll

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

傳回與所指定之統一資源識別元 (URI) 或主機以及驗證類型關聯的 NetworkCredential 執行個體。

多載

GetCredential(Uri, String)	傳回與所指定之統一資源識別項 (URI) 和驗證類型關聯的 NetworkCredential 執行個體。
GetCredential(String, Int32, String)	傳回與指定主機、連接埠和驗證通訊協定關聯的 NetworkCredential 執行個體。

GetCredential(Uri, String)

來源:: CredentialCache.cs

來源:: CredentialCache.cs

來源:: CredentialCache.cs

傳回與所指定之統一資源識別項 (URI) 和驗證類型關聯的 NetworkCredential 執行個體。

public:
 virtual System::Net::NetworkCredential ^ GetCredential(Uri ^ uriPrefix, System::String ^ authType);

public System.Net.NetworkCredential GetCredential (Uri uriPrefix, string authType);

public System.Net.NetworkCredential? GetCredential (Uri uriPrefix, string authType);

abstract member GetCredential : Uri * string -> System.Net.NetworkCredential
override this.GetCredential : Uri * string -> System.Net.NetworkCredential

Public Function GetCredential (uriPrefix As Uri, authType As String) As NetworkCredential

參數

uriPrefix: Uri

Uri，指定認證允許存取之資源的 URI 前置詞。

authType: String

驗證配置，由在 uriPrefix 中指名的資源所使用。

傳回

NetworkCredential

NetworkCredential，或 null (如果在快取中沒有相符的認證)。

實作

GetCredential(Uri, String)

例外狀況

ArgumentNullException

uriPrefix 或 authType 為 null。

範例

下列程式代碼範例會 GetCredential(Uri, String) 使用方法來傳回 NetworkCredential 與指定 URI 和驗證類型相關聯的實例。

void Display( NetworkCredential^ credential )
{
   Console::WriteLine( "\nThe credentials are:" );
   Console::WriteLine( "\nUsername : {0} , Password : {1} , Domain : {2}", credential->UserName, credential->Password, credential->Domain );
}

void GetPage( String^ url, String^ userName, String^ password, String^ domainName )
{
   try
   {
      CredentialCache^ myCredentialCache = gcnew CredentialCache;

      // Dummy names used as credentials.
      myCredentialCache->Add( gcnew Uri( "http://microsoft.com/" ), "Basic", gcnew NetworkCredential( "user1","passwd1","domain1" ) );
      myCredentialCache->Add( gcnew Uri( "http://msdn.com/" ), "Basic", gcnew NetworkCredential( "user2","passwd2","domain2" ) );
      myCredentialCache->Add( gcnew Uri( url ), "Basic", gcnew NetworkCredential( userName,password,domainName ) );

      // Create a webrequest with the specified url.
      WebRequest^ myWebRequest = WebRequest::Create( url );

      // Call 'GetCredential' to obtain the credentials specific to our Uri.
      NetworkCredential^ myCredential = myCredentialCache->GetCredential( gcnew Uri( url ), "Basic" );
      Display( myCredential );

      // Associating only our credentials.
      myWebRequest->Credentials = myCredential;

      // Sends the request and waits for response.
      WebResponse^ myWebResponse = myWebRequest->GetResponse();

      // Process response here.
      Console::WriteLine( "\nResponse Received." );
      myWebResponse->Close();
   }
   catch ( WebException^ e ) 
   {
      if ( e->Response != nullptr )
            Console::WriteLine( "\r\nFailed to obtain a response. The following error occurred : {0}", (dynamic_cast<HttpWebResponse^>(e->Response))->StatusDescription );
      else
            Console::WriteLine( "\r\nFailed to obtain a response. The following error occurred : {0}", e->Status );
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( "\nThe following exception was raised : {0}", e->Message );
   }
}

  public static void GetPage(string url,string userName,string password,string domainName)
  {
      try
      {
          CredentialCache myCredentialCache = new CredentialCache();
          // Dummy names used as credentials.
          myCredentialCache.Add(new Uri("http://microsoft.com/"),"Basic", new NetworkCredential("user1","passwd1","domain1"));
          myCredentialCache.Add(new Uri("http://msdn.com/"),"Basic", new NetworkCredential("user2","passwd2","domain2"));
          myCredentialCache.Add(new Uri(url),"Basic", new NetworkCredential(userName,password,domainName));
          // Create a webrequest with the specified url.
       WebRequest myWebRequest = WebRequest.Create(url);
          // Call 'GetCredential' to obtain the credentials specific to our Uri.
          NetworkCredential myCredential = myCredentialCache.GetCredential(new Uri(url),"Basic");
          Display(myCredential);
       // Associating only our credentials.
          myWebRequest.Credentials = myCredential;
          // Sends the request and waits for response.
       WebResponse myWebResponse = myWebRequest.GetResponse();

          // Process response here.

       Console.WriteLine("\nResponse Received.");
          myWebResponse.Close();
      }
      catch(WebException e)
      {
          if (e.Response != null)
              Console.WriteLine("\r\nFailed to obtain a response. The following error occurred : {0}",((HttpWebResponse)(e.Response)).StatusDescription);
          else
              Console.WriteLine("\r\nFailed to obtain a response. The following error occurred : {0}",e.Status);
      }
      catch(Exception e)
      {
          Console.WriteLine("\nThe following exception was raised : {0}",e.Message);
      }
}
public static void Display(NetworkCredential credential)
{
  Console.WriteLine("\nThe credentials are:");
  Console.WriteLine("\nUsername : {0} ,Password : {1} ,Domain : {2}",credential.UserName,credential.Password,credential.Domain);
}

Public Shared Sub GetPage(url As String, userName As String, password As String, domainName As String)
    Try
        Dim myCredentialCache As New CredentialCache()
        ' Dummy names used as credentials    
        myCredentialCache.Add(New Uri("http://microsoft.com/"), "Basic", New NetworkCredential("user1", "passwd1", "domain1"))
        myCredentialCache.Add(New Uri("http://msdn.com/"), "Basic", New NetworkCredential("user2", "passwd2", "domain2"))
        myCredentialCache.Add(New Uri(url), "Basic", New NetworkCredential(userName, password, domainName))
        ' Creates a webrequest with the specified url. 
        Dim myWebRequest As WebRequest = WebRequest.Create(url)
        ' Call 'GetCredential' to obtain the credentials specific to our Uri.
        Dim myCredential As NetworkCredential = myCredentialCache.GetCredential(New Uri(url), "Basic")
        Display(myCredential)
        myWebRequest.Credentials = myCredential 'Associating only our credentials            
        ' Sends the request and waits for response.
        Dim myWebResponse As WebResponse = myWebRequest.GetResponse()
        ' Process response here.
        Console.WriteLine(ControlChars.Cr + "Response Received.")
        myWebResponse.Close()

    Catch e As WebException
        If Not (e.Response Is Nothing) Then
            Console.WriteLine(ControlChars.Lf + ControlChars.Cr + "Failed to obtain a response. The following error occurred : {0}", CType(e.Response, HttpWebResponse).StatusDescription)
        Else
            Console.WriteLine(ControlChars.Lf + ControlChars.Cr + "Failed to obtain a response. The following error occurred : {0}", e.Status)
        End If
    Catch e As Exception
        Console.WriteLine(ControlChars.Cr + "The following exception was raised : {0}", e.Message)
    End Try
End Sub

Public Shared Sub Display(ByVal credential As NetworkCredential)
    Console.WriteLine("The credentials are: ")
    Console.WriteLine(ControlChars.Cr + "Username : {0} ,Password : {1} ,Domain : {2}", credential.UserName, credential.Password, credential.Domain)
End Sub

備註

方法會 GetCredential(Uri, String) 搜尋 CredentialCache ，並傳回 NetworkCredential 指定的 URI 和授權類型的實例。 CredentialCache如果不包含相符NetworkCredential的實體，null則會傳回。

GetCredential 會使用快取中最長相符的 URI 前置詞來判斷要針對授權類型傳回的認證集。下表顯示範例。

URI 前置詞	相符項
`http://www.contoso.com/portal/news.htm`	特定網頁 `news.htm`的要求。
`http://www.contoso.com/portal/`	要求路徑中的所有 `portal` 內容，但頁面 `news.htm`除外。
`http://www.contoso.com/`	要求位於 `www.contoso.com`的所有資源，但路徑中的 `portal` 資源除外。

適用於

GetCredential(String, Int32, String)

來源:: CredentialCache.cs

來源:: CredentialCache.cs

來源:: CredentialCache.cs

傳回與指定主機、連接埠和驗證通訊協定關聯的 NetworkCredential 執行個體。

public:
 virtual System::Net::NetworkCredential ^ GetCredential(System::String ^ host, int port, System::String ^ authenticationType);

public System.Net.NetworkCredential GetCredential (string host, int port, string authenticationType);

public System.Net.NetworkCredential? GetCredential (string host, int port, string authenticationType);

abstract member GetCredential : string * int * string -> System.Net.NetworkCredential
override this.GetCredential : string * int * string -> System.Net.NetworkCredential

Public Function GetCredential (host As String, port As Integer, authenticationType As String) As NetworkCredential

參數

host: String

識別主機電腦的 String。

port: Int32

Int32，指定 host 上的連接埠。

authenticationType: String

String，識別連接到 host 時，所使用的驗證配置。

傳回

NetworkCredential

NetworkCredential，或 null (如果在快取中沒有相符的認證)。

實作

GetCredential(String, Int32, String)

例外狀況

ArgumentNullException

host 為 null。

-或-

authType 為 null。

ArgumentException

authType 不是接受的值。

-或-

host 等於空字串 ("")。

ArgumentOutOfRangeException

port 小於零。

備註

這個方法會 CredentialCache 搜尋，並傳回 NetworkCredential 指定的主機、埠和授權類型的實例。傳遞至這個方法的host、 port和 authType 值與使用 Add 方法新增CredentialCache認證時所指定的值不區分大小寫。

的支援值為 authType “NTLM”、“Digest”、“Kerberos” 和 “Negotiate”。

適用於

共用方式為

CredentialCache.GetCredential 方法

定義

多載

GetCredential(Uri, String)

參數

傳回

實作

例外狀況

範例

備註

適用於

GetCredential(String, Int32, String)

參數

傳回

實作

例外狀況

備註

適用於

其他資源