OracleConnectionStringBuilder.ContainsKey(String) 方法

定义

命名空间:

System.Data.OracleClient

程序集:

System.Data.OracleClient.dll

确定 OracleConnectionStringBuilder 是否包含特定键。

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

参数

keyword

String

要在 OracleConnectionStringBuilder 中定位的键。

返回

Boolean

如果 OracleConnectionStringBuilder 包含具有指定键的元素，则为 true；否则为 false。

例外

ArgumentNullException

keyword 为 Null（在 Visual Basic 中为 Nothing）

示例

以下示例创建一个 OracleConnectionStringBuilder 实例，设置其一些属性，然后尝试通过调用 ContainsKey 方法来确定对象中是否存在各种键。

OracleConnectionStringBuilder builder =
    new(GetConnectionString());
Console.WriteLine($"Connection string = '{builder.ConnectionString}'");

// Keys you've provided return true.
Console.WriteLine(builder.ContainsKey("Integrated Security"));

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

// Keys that do not exist return false.
Console.WriteLine(builder.ContainsKey("MyKey"));

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"))

    ' 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

注解

由于 OracleConnectionStringBuilder 包含固定大小的键/值对集合，因此 ContainsKey 方法只确定特定键名是否有效。

另请参阅

• 生成连接字符串