Was this page helpful?
Your feedback about this content is important. Let us know what you think.
Additional feedback?
1500 characters remaining
ContainsKey Method

OracleConnectionStringBuilder.ContainsKey Method

Determines whether the OracleConnectionStringBuilder contains a specific key.

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

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

Parameters

keyword
Type: System.String

The key to locate in the OracleConnectionStringBuilder.

Return Value

Type: System.Boolean
true if the OracleConnectionStringBuilder contains an element that has the specified key; otherwise, false.

ExceptionCondition
ArgumentNullException

keyword is null (Nothing in Visual Basic)

Because the OracleConnectionStringBuilder contains a fixed-size collection of key/value pairs, the ContainsKey method determines only if a particular key name is valid.

The following example creates an OracleConnectionStringBuilder instance, sets some of its properties, and then tries to determine whether various keys exist within the object by calling the ContainsKey method.

' 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

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0
Show:
© 2015 Microsoft