CredentialCache.GetCredential 方法

参考

定义

命名空间:: System.Net

程序集:: System.Net.Primitives.dll

程序集:: System.dll

程序集:: netstandard.dll

重要

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返回与指定的统一资源标识符 (URI) 或主机和身份验证类型相关联的 NetworkCredential 实例。

重载

GetCredential(Uri, String)	返回与指定的统一资源标识符 (URI) 和身份验证类型相关联的 NetworkCredential 实例。
GetCredential(String, Int32, String)	返回与指定的主机、端口和身份验证协议关联的 NetworkCredential 实例。

GetCredential(Uri, String)

Source:: CredentialCache.cs

Source:: CredentialCache.cs

Source:: CredentialCache.cs

返回与指定的统一资源标识符 (URI) 和身份验证类型相关联的 NetworkCredential 实例。

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

参数

uriPrefix: Uri

一个 Uri，它指定资源的 URI 前缀，该资源由凭据授予访问权。

authType: String

在 uriPrefix 中命名的资源所使用的身份验证方案。

NetworkCredential

NetworkCredential；如果缓存中没有匹配的凭据，则为 null。

实现

GetCredential(Uri, String)

例外

ArgumentNullException

uriPrefix 或 authType 为 null。

示例

下面的代码示例使用 GetCredential(Uri, String) 方法返回与 NetworkCredential 指定的 URI 和身份验证类型关联的实例。

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

注解

方法 GetCredential(Uri, String) 搜索并 CredentialCache 返回 NetworkCredential 指定 URI 和授权类型的实例。 CredentialCache如果不包含匹配NetworkCredential的实例，null则返回。

GetCredential 使用缓存中最长的匹配 URI 前缀来确定要为授权类型返回的凭据集。下表显示了示例。

URI 前缀	匹配
`http://www.contoso.com/portal/news.htm`	对特定网页 `news.htm`的请求。
`http://www.contoso.com/portal/`	请求路径中的所有 `portal` 内容，页面 `news.htm`除外。
`http://www.contoso.com/`	请求位于的所有 `www.contoso.com`资源，路径中的 `portal` 资源除外。

适用于

GetCredential(String, Int32, String)

Source:: CredentialCache.cs

Source:: CredentialCache.cs

Source:: CredentialCache.cs

返回与指定的主机、端口和身份验证协议关联的 NetworkCredential 实例。

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

参数

host: String

标识主机的 String。

port: Int32

指定要连接到 host 的端口的 Int32。

authenticationType: String

String，它标识连接到 host 时使用的身份验证方案。

NetworkCredential

NetworkCredential；如果缓存中没有匹配的凭据，则为 null。

实现

GetCredential(String, Int32, String)

例外

ArgumentNullException

host 为 null。

或

authType 为 null。

ArgumentException

authType 不是一个接受的值。

- 或 -

host 是空字符串 ("")。

ArgumentOutOfRangeException

port 小于零。

注解

此方法搜索并 CredentialCache 返回 NetworkCredential 指定主机、端口和授权类型的实例。 host与使用 Add 方法将凭据添加到 CredentialCache 时指定的值相比，传递给此方法的、 port和 authType 值不区分大小写。

支持的值为 authType “NTLM”、“Digest”、“Kerberos”和“Negotiate”。

适用于

CredentialCache.GetCredential 方法

定义

重载

GetCredential(Uri, String)

参数

返回

实现

例外

示例

注解

适用于

GetCredential(String, Int32, String)

参数

返回

实现

例外

注解

适用于

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