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DbConnectionStringBuilder.ContainsKey Method

Determines whether the DbConnectionStringBuilder contains a specific key.

Namespace:  System.Data.Common
Assembly:  System.Data (in System.Data.dll)

'Declaration
Public Overridable Function ContainsKey ( _
	keyword As String _
) As Boolean

Parameters

keyword
Type: System.String

The key to locate in the DbConnectionStringBuilder.

Return Value

Type: System.Boolean
true if the DbConnectionStringBuilder contains an entry with the specified key; otherwise false.

ExceptionCondition
ArgumentNullException

keyword is a null reference (Nothing in Visual Basic).

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

This code produces the following output:

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".

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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