OracleConnectionStringBuilder.ContainsKey(String) Método

Definición

Espacio de nombres:

System.Data.OracleClient

Ensamblado:

System.Data.OracleClient.dll

Determina si OracleConnectionStringBuilder contiene una clave específica.

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

Parámetros

keyword

String

Clave que se buscará en OracleConnectionStringBuilder.

Devoluciones

Boolean

true si OracleConnectionStringBuilder contiene un elemento con la clave especificada; en caso contrario, false.

Excepciones

ArgumentNullException

keyword es nulo (Nothing en Visual Basic).

Ejemplos

En el ejemplo siguiente se crea una OracleConnectionStringBuilder instancia de , se establecen algunas de sus propiedades y, a continuación, se intenta determinar si existen varias claves dentro del objeto mediante una llamada al ContainsKey método .

// 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

Comentarios

Ya que OracleConnectionStringBuilder contiene una colección de tamaño fijo de pares clave-valor, llamando al método ContainsKey determina solo si un nombre de clave particular es válido.

Consulte también

• Creación de cadenas de conexión