SqlConnectionStringBuilder.ContainsKey(String) Método

Definición

Espacio de nombres:
System.Data.SqlClient
Ensamblado:
System.Data.dll

Determina si el 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 va a buscar en .SqlConnectionStringBuilder

Devoluciones

Boolean

true SqlConnectionStringBuilder es si contiene un elemento que tiene la clave especificada; de lo contrario, falsees .

Excepciones

ArgumentNullException

keyword es null (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 llamando 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 la siguiente salida en la ventana de consola:

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

Comentarios

Dado que SqlConnectionStringBuilder contiene una colección de tamaño fijo de pares clave-valor, el ContainsKey método determina solo si un nombre de clave determinado es válido.

Se aplica a

Consulte también