OdbcConnectionStringBuilder.ContainsKey(String) 方法

定義

命名空間:

System.Data.Odbc

組件:

System.Data.Odbc.dll

套件:

System.Data.Odbc v8.0.0

來源:

OdbcConnectionStringbuilder.cs

判斷 OdbcConnectionStringBuilder 是否包含特定索引鍵。

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

參數

keyword

String

要在 OdbcConnectionStringBuilder 中尋找的索引鍵。

傳回

Boolean

如果 OdbcConnectionStringBuilder 包含具有指定之索引鍵的項目，則為 true，否則為 false。

例外狀況

ArgumentNullException

keyword 是 null (在 Visual Basic 中為 Nothing)。

範例

下列範例會 OdbcConnectionStringBuilder 建立 實例、設定它的一些屬性，然後藉由呼叫 ContainsKey 方法來嘗試判斷物件中是否有各種索引鍵。

using System.Data.Odbc;

class Program
{
    static void Main()
    {
        OdbcConnectionStringBuilder  builder = new OdbcConnectionStringBuilder();
        builder.Driver = "Microsoft Visual FoxPro Driver";
        builder["SourceType"] = "DBC";

        // Keys that you have provided return true.
        Console.WriteLine(builder.ContainsKey("SourceType"));

        // Comparison is case insensitive.
        Console.WriteLine(builder.ContainsKey("sourcetype"));

        // Keys added by the provider return false. This method
        // only examines keys added explicitly.
        Console.WriteLine(builder.ContainsKey("DNS"));

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

        Console.WriteLine("Press Enter to continue.");
        Console.ReadLine();
    }
}

Imports System.Data.Odbc    

Module Module1
  Sub Main()
    Dim builder As New OdbcConnectionStringBuilder()
    builder.Driver = "Microsoft Visual FoxPro Driver"
    builder("SourceType") = "DBC"

    ' Keys you have provided return true.
    Console.WriteLine(builder.ContainsKey("SourceType"))

    ' Comparison is case insensitive.
    Console.WriteLine(builder.ContainsKey("sourcetype"))

    ' Keys added by the provider return false. This method
    ' only examines keys added explicitly.
    Console.WriteLine(builder.ContainsKey("DNS"))

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

    Console.WriteLine("Press Enter to continue.")
    Console.ReadLine()
  End Sub
End Module

另請參閱

• 連接字串產生器
• ADO.NET 中的連接字串