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SqlConnectionStringBuilder.ContainsKey(String) Método

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Definición

Espacio de nombres:
System.Data.SqlClient
Ensamblado:
System.Data.SqlClient.dll
Ensamblado:
System.Data.dll
Paquete:
System.Data.SqlClient v4.9.0
Source:
System.Data.SqlClient.notsupported.cs

Determina si SqlConnectionStringBuilder 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 SqlConnectionStringBuilder.

Devoluciones

Boolean

true si SqlConnectionStringBuilder 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 SqlConnectionStringBuilder instancia, se establecen algunas de sus propiedades y, a continuación, se intenta determinar si existen varias claves dentro del objeto mediante una llamada al método ContainsKey .

using System.Data.SqlClient;

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

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

        // Comparison is case insensitive, and synonyms
        // are automatically converted to their "well-known"
        // names.
        Console.WriteLine(builder.ContainsKey("Database"));

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

        // 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=(local);Integrated Security=SSPI;" +
            "Initial Catalog=AdventureWorks";
    }
}

Imports System.Data.SqlClient

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

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

        ' Comparison is case insensitive, and synonyms
        ' are automatically converted to their "well-known"
        ' names.
        Console.WriteLine(builder.ContainsKey("Database"))

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

        ' Keys that do not 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=(local);Integrated Security=SSPI;" & _
          "Initial Catalog=AdventureWorks"
    End Function
End Module

En el ejemplo se muestra el siguiente resultado en la ventana de consola:

Connection string = Data Source=(local);Initial Catalog=AdventureWorks;Integrated Security=True
True
True
True
False

Comentarios

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

Se aplica a

Consulte también