XmlSecureResolver 建構函式

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)

參數

範例

以下範例透過自訂權限集建構物件 XmlSecureResolver 。

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

另請參閱

• 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)

參數

備註

以下是一些可能的情境以及每種情境應提供的證據類型：

• 如果您在完全信任的環境中工作，請使用您的組件來建立證據。

  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)
  

• 如果您在半信任的環境中工作，您有來自外部來源的程式代碼或數據，而且您知道外部來源的來源，並具有可驗證的 URI，請使用 URI 來建立辨識項：

  
  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)
  

• 如果您在半信任的環境中工作，而且您有來自外部來源的程式代碼或數據，但您不知道該來源的來歷，那麼：

  將 evidence 參數設定為 null。 這不允許存取資源。

  -或-

  如果您的應用程式需要對資源進行一些存取，請向呼叫端要求辨識項。

public:
 XmlSecureResolver(System::Xml::XmlResolver ^ resolver, System::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)

參數

範例

這個範例使用 XmlSecureResolver(XmlResolver, String) 建構子建立 XmlSecureResolver 一個物件，該物件只能存取你的本地內聯網網站。

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

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

備註