OracleConnectionStringBuilder.ContainsKey(String) Método
Definição
Importante
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Determina se a OracleConnectionStringBuilder contém uma chave 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
Parâmetros
- keyword
- String
A chave a ser localizada no OracleConnectionStringBuilder.
Retornos
true
se o OracleConnectionStringBuilder contiver um elemento que tem a chave especificada; caso contrário, false
.
Exceções
keyword
é nulo (Nothing
no Visual Basic)
Exemplos
O exemplo a seguir cria uma OracleConnectionStringBuilder instância, define algumas de suas propriedades e tenta determinar se existem várias chaves dentro do objeto chamando o 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
Comentários
Como o OracleConnectionStringBuilder contém uma coleção de tamanho fixo de pares chave/valor, o ContainsKey método determina apenas se um nome de chave específico é válido.