DbConnectionStringBuilder.ContainsKey(String) Método

  • Referencia

Definición

Espacio de nombres:
System.Data.Common
Ensamblado:
System.Data.Common.dll
Ensamblado:
System.Data.dll
Ensamblado:
netstandard.dll
Source:
DbConnectionStringBuilder.cs
Source:
DbConnectionStringBuilder.cs
Source:
DbConnectionStringBuilder.cs

Determina si DbConnectionStringBuilder contiene una clave específica.

public:
 virtual bool ContainsKey(System::String ^ keyword);
public virtual bool ContainsKey (string keyword);
abstract member ContainsKey : string -> bool
override this.ContainsKey : string -> bool
Public Overridable Function ContainsKey (keyword As String) As Boolean

Parámetros

keyword
String

Clave que se buscará en DbConnectionStringBuilder.

Devoluciones

Boolean

Es true si DbConnectionStringBuilder contiene una entrada con la clave especificada; en caso contrario, es false.

Excepciones

ArgumentNullException

keyword es una referencia nula (Nothing en Visual Basic).

Ejemplos

static void Main()
{
    DbConnectionStringBuilder builder = new DbConnectionStringBuilder();
    builder.Add("Provider", "Provider=Microsoft.Jet.OLEDB.4.0");
    builder.Add("Data Source", "C:\\ThisExcelWorkbook.xls");
    builder.Add("Extended Properties", "Excel 8.0;HDR=Yes;IMEX=1");

    // Displays the values in the DbConnectionStringBuilder.
    Console.WriteLine("Contents of the DbConnectionStringBuilder:");
    Console.WriteLine(builder.ConnectionString);

    // Searches for a key.
    if (builder.ContainsKey("Data Source"))
    {
        Console.WriteLine("The collection contains the key \"Data Source\".");
    }
    else
    {
        Console.WriteLine("The collection does not contain the key \"Data Source\".");
    }
    Console.ReadLine();
}

Sub Main()
    ' The following code example searches for an element in a 
    ' DbConnectionStringBuilder.
    Dim builder As New DbConnectionStringBuilder
    builder.Add("Provider", "Provider=Microsoft.Jet.OLEDB.4.0")
    builder.Add("Data Source", "C:\ThisExcelWorkbook.xls")
    builder.Add("Extended Properties", "Excel 8.0;HDR=Yes;IMEX=1")

    ' Displays the values in the DbConnectionStringBuilder.
    Console.WriteLine("Contents of the DbConnectionStringBuilder:")
    Console.WriteLine(builder.ConnectionString)

    ' Searches for a key.
    If builder.ContainsKey("Data Source") Then
        Console.WriteLine("The collection contains the key ""Data Source"".")
    Else
        Console.WriteLine("The collection does not contain the key ""Data Source"".")
    End If
    Console.ReadLine()
End Sub

Este código genera el siguiente resultado:

Contents of the DbConnectionStringBuilder:
provider="Provider=Microsoft.Jet.OLEDB.4.0";data
source=C:\MyExcel.xls;extended
properties="Excel 8.0;HDR=Yes;IMEX=1"
The collection contains the key "Data Source".

Se aplica a

Consulte también