OdbcConnectionStringBuilder.Clear 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

清除 OdbcConnectionStringBuilder 執行個體的內容。

public:
 override void Clear();

public override void Clear ();

override this.Clear : unit -> unit

Public Overrides Sub Clear ()

範例

using System.Data.Odbc;
class Program
{
    static void Main()
    {
        OdbcConnectionStringBuilder builder = new OdbcConnectionStringBuilder();

        // Call the Add method to explicitly add key/value
        // pairs to the internal collection.
        builder.Driver = "Microsoft Excel Driver (*.xls)";
        builder["Dbq"] = "C:\\Data.xls";
        builder["DriverID"] = "790";
        builder["DefaultDir"] = "C:\\";

        // Dump the contents of the "filled-in" OdbcConnectionStringBuilder
        // to the Console window:
        DumpBuilderContents(builder);

        // Clear current values and reset known keys to their
        // default values.
        builder.Clear();

        // Dump the contents of the newly emptied OdbcConnectionStringBuilder
        // to the console window.
        DumpBuilderContents(builder);

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

    private static void DumpBuilderContents(OdbcConnectionStringBuilder builder)
    {
        Console.WriteLine("=================");
        Console.WriteLine("builder.ConnectionString = " + builder.ConnectionString);
        foreach (string key in builder.Keys)
        {
            Console.WriteLine(key + "=" + builder[key].ToString());
        }
    }
}

Imports System.Data.Odbc    

Module Module1
  Sub Main()
    Dim builder As New OdbcConnectionStringBuilder()

    ' Call the Add method to explicitly add key/value
    ' pairs to the internal collection.
    builder.Driver = "Microsoft Excel Driver (*.xls)"
    builder("Dbq") = "C:\Data.xls"
    builder("DriverID") = "790"
    builder("DefaultDir") = "C:\"

    ' Dump the contents of the "filled-in" OdbcConnectionStringBuilder
    ' to the console window.
    DumpBuilderContents(builder)

    ' Clear current values and reset known keys to their
    ' default values.
    builder.Clear()

    ' Dump the contents of the newly emptied 
    ' OdbcConnectionStringBuilder
    ' to the console window.
    DumpBuilderContents(builder)

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

  Private Sub DumpBuilderContents(ByVal builder As OdbcConnectionStringBuilder)
    Console.WriteLine("=================")
    Console.WriteLine("builder.ConnectionString = " & builder.ConnectionString)
    For Each key As String In builder.Keys
      Console.WriteLine(key & "=" & builder.Item(key).ToString)
    Next
  End Sub
End Module

備註

方法Clear會從 OdbcConnectionStringBuilder 中移除所有索引鍵/值組，並將 和 Dsn 屬性重設為Driver預設值。 方法 Clear 也會將 Count 屬性設定為 0，並將 ConnectionString 屬性設定為空字串。

另請參閱

• 連接字串產生器
• ADO.NET 中的連接字串