CryptoProvider.CanDecrypt 屬性
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。
取得值,指出使用者是否具有解密權限。
public:
property bool CanDecrypt { bool get(); };
public bool CanDecrypt { get; }
member this.CanDecrypt : bool
Public ReadOnly Property CanDecrypt As Boolean
true
UseLicense如果 授與使用者解密的許可權,則為 , false
否則為 。
下列範例示範如何使用 CanDecrypt 屬性來判斷是否允許解密。
ShowStatus(" Binding UseLicense with the SecureEnvironment" +
"\n to obtain the CryptoProvider.");
CryptoProvider cryptoProvider = useLicense.Bind(_secureEnv);
ShowStatus(" Obtaining BoundGrants.");
ReadOnlyCollection<ContentGrant> grants =
cryptoProvider.BoundGrants;
rightsBlockTitle.Text = "Rights - " + Filename(useLicenseFile);
rightsBlock.Text = "GRANTS LIST\n-----------------\n";
foreach (ContentGrant grant in grants)
{
rightsBlock.Text += "USER: " + grant.User.Name + " [" +
grant.User.AuthenticationType + "]\n";
rightsBlock.Text += "RIGHT: " + grant.Right.ToString() + "\n";
rightsBlock.Text += " From: " + grant.ValidFrom + "\n";
rightsBlock.Text += " Until: " + grant.ValidUntil + "\n";
}
if (cryptoProvider.CanDecrypt == true)
ShowStatus(" Decryption granted.");
else
ShowStatus(" CANNOT DECRYPT!");
ShowStatus(" Binding UseLicense with the SecureEnvironment" & vbLf & " to obtain the CryptoProvider.")
Dim cryptoProvider As CryptoProvider = useLicense.Bind(_secureEnv)
ShowStatus(" Obtaining BoundGrants.")
Dim grants As ReadOnlyCollection(Of ContentGrant) = cryptoProvider.BoundGrants
rightsBlockTitle.Text = "Rights - " & Filename(useLicenseFile)
rightsBlock.Text = "GRANTS LIST" & vbLf & "-----------------" & vbLf
For Each grant As ContentGrant In grants
rightsBlock.Text &= "USER: " & grant.User.Name & " [" & grant.User.AuthenticationType & "]" & vbLf
rightsBlock.Text &= "RIGHT: " & grant.Right.ToString() & vbLf
rightsBlock.Text &= " From: " & grant.ValidFrom & vbLf
rightsBlock.Text &= " Until: " & grant.ValidUntil & vbLf
Next grant
If cryptoProvider.CanDecrypt = True Then
ShowStatus(" Decryption granted.")
Else
ShowStatus(" CANNOT DECRYPT!")
End If
CanDecrypttrue
如果系結至這個 CryptoProvider 的 UseLicense 會授與使用者讀取存取許可權,例如檢視、編輯、列印或擁有者,則傳回 。