XmlSecureResolver Construtores

public:
 XmlSecureResolver(System::Xml::XmlResolver ^ resolver, System::Security::PermissionSet ^ permissionSet);

public XmlSecureResolver (System.Xml.XmlResolver resolver, System.Security.PermissionSet permissionSet);

new System.Xml.XmlSecureResolver : System.Xml.XmlResolver * System.Security.PermissionSet -> System.Xml.XmlSecureResolver

Public Sub New (resolver As XmlResolver, permissionSet As PermissionSet)

Parâmetros

Exemplos

O exemplo a seguir constrói um XmlSecureResolver objeto usando um conjunto de permissões personalizado.

Object^ GetFile( String^ fileURL, XmlResolver^ resolver )
{
   // Generate the default PermissionSet using the file URL.
   Evidence^ evidence = XmlSecureResolver::CreateEvidenceForUrl( fileURL );
   PermissionSet^ myPermissions = SecurityManager::ResolvePolicy( evidence );
   
   // Modify the PermissionSet to only allow access to http://www.contoso.com.
   // Create a WebPermission which only allows access to http://www.contoso.com.
   WebPermission^ myWebPermission = gcnew WebPermission(
      NetworkAccess::Connect,"http://www.contoso.com" );
   // Replace the existing WebPermission in myPermissions with the updated WebPermission.
   myPermissions->SetPermission( myWebPermission );
   
   // Use the modified PermissionSet to construct the XmlSecureResolver.
   XmlSecureResolver^ sResolver = gcnew XmlSecureResolver( resolver,myPermissions );
   
   // Get the object.
   Uri^ fullUri = sResolver->ResolveUri( nullptr, fileURL );
   return sResolver->GetEntity( fullUri, nullptr, nullptr );
}

public static Object GetFile (String fileURL, XmlResolver resolver) {

  // Generate the default PermissionSet using the file URL.
  Evidence evidence = XmlSecureResolver.CreateEvidenceForUrl(fileURL);
  PermissionSet myPermissions = SecurityManager.ResolvePolicy(evidence);

  // Modify the PermissionSet to only allow access to http://www.contoso.com.
  // Create a WebPermission which only allows access to http://www.contoso.com.
  WebPermission myWebPermission = new WebPermission(NetworkAccess.Connect, "http://www.contoso.com");
  // Replace the existing WebPermission in myPermissions with the updated WebPermission.
  myPermissions.SetPermission(myWebPermission);

  // Use the modified PermissionSet to construct the XmlSecureResolver.
  XmlSecureResolver sResolver = new XmlSecureResolver(resolver, myPermissions);

  // Get the object.
  Uri fullUri = sResolver.ResolveUri(null, fileURL);
  return sResolver.GetEntity(fullUri, null, null);
}

public shared function GetFile (fileURL as String , resolver as XmlResolver) as Object
 
  '  Generate the default PermissionSet using the file URL.
  Dim evidence as Evidence = XmlSecureResolver.CreateEvidenceForUrl(fileURL)
  Dim myPermissions as PermissionSet = SecurityManager.ResolvePolicy(evidence)

  '  Modify the PermissionSet to only allow access to http://www.contoso.com.
  '  Create a WebPermission that only allows access to http://www.contoso.com.
  Dim myWebPermission as WebPermission = new WebPermission(NetworkAccess.Connect, "http://www.contoso.com")
  '  Replace the existing WebPermission in myPermissions with the updated WebPermission.
  myPermissions.SetPermission(myWebPermission)

  '  Use the modified PermissionSet to construct the XmlSecureResolver.
  Dim sResolver as XmlSecureResolver = new XmlSecureResolver(resolver, myPermissions)

  '  Get the object.
  Dim fullUri as Uri = sResolver.ResolveUri(nothing, fileURL)
  return sResolver.GetEntity(fullUri, nothing, nothing)
end function

Confira também

• CreateEvidenceForUrl(String)
• Evidence
• WebPermission
• SecurityManager

public:
 XmlSecureResolver(System::Xml::XmlResolver ^ resolver, System::Security::Policy::Evidence ^ evidence);

public XmlSecureResolver (System.Xml.XmlResolver resolver, System.Security.Policy.Evidence evidence);

new System.Xml.XmlSecureResolver : System.Xml.XmlResolver * System.Security.Policy.Evidence -> System.Xml.XmlSecureResolver

Public Sub New (resolver As XmlResolver, evidence As Evidence)

Parâmetros

Comentários

Aqui estão alguns cenários possíveis e o tipo de evidência a ser fornecida para cada cenário:

• Se você estiver trabalhando em um ambiente totalmente confiável, use o assembly para criar a evidência:

  Evidence myEvidence = this.GetType().Assembly.Evidence;
  XmlSecureResolver myResolver;
  myResolver = new XmlSecureResolver(new XmlUrlResolver(), myEvidence);
  

  Dim myEvidence As Evidence = Me.GetType().Assembly.Evidence
  Dim myResolver As XmlSecureResolver
  myResolver = New XmlSecureResolver(New XmlUrlResolver(), myEvidence)
  

• Se você estiver trabalhando em um ambiente semi-confiável, terá código ou dados provenientes de uma fonte externa e sabe a origem da origem externa e tem um URI verificável, use o URI para criar a evidência:

  
  Evidence myEvidence = XmlSecureResolver.CreateEvidenceForUrl(sourceURI);
  XmlSecureResolver myResolver = new XmlSecureResolver(new XmlUrlResolver(), myEvidence);
  

  Dim myEvidence As Evidence = XmlSecureResolver.CreateEvidenceForUrl(sourceURI)
  Dim myResolver As New XmlSecureResolver(New XmlUrlResolver(), myEvidence)
  

• Se você estiver trabalhando em um ambiente semi-confiável e tiver código ou dados provenientes de uma fonte externa, mas também não souber a origem da fonte externa:

  Defina o parâmetro de evidence a null. Isso não permite sem acesso a recursos.

  - ou -

  Se seu aplicativo requer algum acesso aos recursos, solicite a evidência do chamador.

public:
 XmlSecureResolver(System::Xml::XmlResolver ^ resolver, System::String ^ securityUrl);

public XmlSecureResolver (System.Xml.XmlResolver resolver, string? securityUrl);

public XmlSecureResolver (System.Xml.XmlResolver resolver, string securityUrl);

new System.Xml.XmlSecureResolver : System.Xml.XmlResolver * string -> System.Xml.XmlSecureResolver

Public Sub New (resolver As XmlResolver, securityUrl As String)

Parâmetros

Exemplos

Este exemplo usa o XmlSecureResolver(XmlResolver, String) construtor para criar um XmlSecureResolver objeto que tem permissão para acessar apenas o site da intranet local.

XmlSecureResolver myResolver = new XmlSecureResolver(new XmlUrlResolver(), "http://myLocalSite/");

Dim myResolver As New XmlSecureResolver(New XmlUrlResolver(), "http://myLocalSite/")

Comentários