OracleConnectionStringBuilder.ContainsKey(String) Método
Definición
Importante
Parte de la información hace referencia a la versión preliminar del producto, que puede haberse modificado sustancialmente antes de lanzar la versión definitiva. Microsoft no otorga ninguna garantía, explícita o implícita, con respecto a la información proporcionada aquí.
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
true
si OracleConnectionStringBuilder contiene un elemento con la clave especificada; en caso contrario, false
.
Excepciones
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.