OracleConnectionStringBuilder.ContainsKey(String) Methode

Definition

Namespace:

System.Data.OracleClient

Assembly:

System.Data.OracleClient.dll

Stellt fest, ob der OracleConnectionStringBuilder einen bestimmten Schlüssel enthält.

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

Parameter

keyword

String

Der im OracleConnectionStringBuilder zu suchende Schlüssel.

Gibt zurück

Boolean

true, wenn OracleConnectionStringBuilder ein Element mit dem angegebenen Schlüssel enthält, andernfalls false.

Ausnahmen

ArgumentNullException

keyword ist NULL (Nothing in Visual Basic).

Beispiele

Im folgenden Beispiel wird eine OracleConnectionStringBuilder instance erstellt, einige eigenschaften festgelegt und anschließend versucht, durch Aufrufen ContainsKey der -Methode zu bestimmen, ob verschiedene Schlüssel innerhalb des -Objekts vorhanden sind.

// 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

Hinweise

Da der OracleConnectionStringBuilder eine Sammlung von Schlüssel-Wert-Paaren mit fester Größe enthält, bestimmt die ContainsKey-Methode lediglich, ob ein bestimmter Schlüsselname gültig ist.

Weitere Informationen

• Erstellen von Verbindungszeichenfolgen