OdbcConnectionStringBuilder.ContainsKey(String) Metode

Definisi

Ruang nama:

System.Data.Odbc

Rakitan:

System.Data.Odbc.dll

Paket:

System.Data.Odbc v9.0.0-preview.6.24327.7

Sumber:

OdbcConnectionStringbuilder.cs

Menentukan apakah berisi OdbcConnectionStringBuilder kunci tertentu.

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

Parameter

keyword

String

Kunci untuk menemukan di OdbcConnectionStringBuilder.

Mengembalikan

Boolean

true OdbcConnectionStringBuilder jika berisi elemen yang memiliki kunci yang ditentukan; jika tidak false.

Pengecualian

ArgumentNullException

keyword null (Nothing dalam Visual Basic).

Contoh

Contoh berikut membuat instans OdbcConnectionStringBuilder , mengatur beberapa propertinya, lalu mencoba menentukan apakah berbagai kunci ada dalam objek dengan memanggil ContainsKey metode .

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

Lihat juga

• Pembangun String Koneksi
• String Koneksi dalam ADO.NET