DbConnectionStringBuilder.ContainsKey(String) Metode

Referensi

Definisi

Ruang nama:: System.Data.Common

Rakitan:: System.Data.Common.dll

Rakitan:: System.Data.dll

Rakitan:: netstandard.dll

Sumber:: DbConnectionStringBuilder.cs

Sumber:: DbConnectionStringBuilder.cs

Sumber:: DbConnectionStringBuilder.cs

Penting

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Menentukan apakah DbConnectionStringBuilder berisi kunci tertentu.

public:
 virtual bool ContainsKey(System::String ^ keyword);

public virtual bool ContainsKey (string keyword);

abstract member ContainsKey : string -> bool
override this.ContainsKey : string -> bool

Public Overridable Function ContainsKey (keyword As String) As Boolean

Parameter

keyword: String

Kunci untuk menemukan di DbConnectionStringBuilder.

Mengembalikan

Boolean

trueDbConnectionStringBuilder jika berisi entri dengan kunci yang ditentukan; jika tidak false.

Pengecualian

ArgumentNullException

keyword adalah referensi null (Nothing dalam Visual Basic).

Contoh

static void Main()
{
    DbConnectionStringBuilder builder = 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"))
    {
        Console.WriteLine("The collection contains the key \"Data Source\".");
    }
    else
    {
        Console.WriteLine("The collection does not contain the key \"Data Source\".");
    }
    Console.ReadLine();
}

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

Kode ini menghasilkan output berikut:

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".

Berlaku untuk

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