OracleConnectionStringBuilder.ContainsKey(String) Metodo

Definizione

Spazio dei nomi:

System.Data.OracleClient

Assembly:

System.Data.OracleClient.dll

Determina se l'oggetto OracleConnectionStringBuilder contiene una chiave specifica.

public:
 override bool ContainsKey(System::String ^ keyword);

public override bool ContainsKey (string keyword);

override this.ContainsKey : string -> bool

Public Overrides Function ContainsKey (keyword As String) As Boolean

Parametri

keyword

String

Chiave da individuare in OracleConnectionStringBuilder.

Restituisce

Boolean

true se la classe OracleConnectionStringBuilder contiene un elemento con la chiave specificata; in caso contrario, false.

Eccezioni

ArgumentNullException

keyword è Null (Nothing in Visual Basic).

Esempio

Nell'esempio seguente viene creata un'istanza OracleConnectionStringBuilder di , vengono impostate alcune delle relative proprietà e quindi si tenta di determinare se esistono diverse chiavi all'interno dell'oggetto chiamando il ContainsKey metodo .

// You may need to set a reference to the System.Data.OracleClient
// assembly before you can run this sample.
using System.Data.OracleClient;

class Program
{
    static void Main()
    {
        OracleConnectionStringBuilder builder =
            new OracleConnectionStringBuilder(GetConnectionString());
        Console.WriteLine("Connection string = " + builder.ConnectionString);

        // Keys you have provided return true.
        Console.WriteLine(builder.ContainsKey("Integrated Security"));

        // Comparison is case insensitive, and synonyms for the
        // keywords are translated to well-known names.
        // The following returns true because "PWD" is a
        // synonym for "Password", a valid key.
        Console.WriteLine(builder.ContainsKey("PWD"));

        // Keys that are valid but have not been set return true.
        Console.WriteLine(builder.ContainsKey("Unicode"));

        // Keys that do not exist return false.
        Console.WriteLine(builder.ContainsKey("MyKey"));

        Console.WriteLine("Press Enter to continue.");
        Console.ReadLine();
    }

    private static string GetConnectionString()
    {
        // To avoid storing the connection string in your code,
        // you can retrieve it from a configuration file.
        return "Server=OracleDemo;Integrated Security=True";
    }
}

' You may need to set a reference to the System.Data.OracleClient
' assembly before you can run this sample.
Imports System.Data.OracleClient

Module Module1
  Sub Main()
    Dim builder As _
     New OracleConnectionStringBuilder(GetConnectionString())
    Console.WriteLine("Connection string = " & builder.ConnectionString)

    ' Keys you have provided return true.
    Console.WriteLine(builder.ContainsKey("Integrated Security"))

    ' Comparison is case insensitive, and synonyms for the 
    ' keywords are translated to well-known names.
    ' The following returns True because "PWD" is a 
    ' synonym for "Password", a valid key.
    Console.WriteLine(builder.ContainsKey("PWD"))

    ' Keys that are valid but have not been set return true.
    Console.WriteLine(builder.ContainsKey("Unicode"))

    ' Keys that don't exist return false.
    Console.WriteLine(builder.ContainsKey("MyKey"))

    Console.WriteLine("Press Enter to continue.")
    Console.ReadLine()
  End Sub

  Private Function GetConnectionString() As String
    ' To avoid storing the connection string in your code,
    ' you can retrieve it from a configuration file. 
    Return "Server=OracleDemo;Integrated Security=True"
  End Function
End Module

Commenti

Poiché OracleConnectionStringBuilder contiene una raccolta a dimensione fissa di coppie chiave/valore, il metodo ContainsKey determina solo se è valido un nome della chiave particolare.

Vedi anche

• Compilazione delle stringhe di connessione