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OdbcConnectionStringBuilder.Item[String] 屬性

定義

取得或設定與指定之索引鍵相關聯的值。 在 C# 中,這個屬性是索引子 (Indexer)。

public:
 virtual property System::Object ^ default[System::String ^] { System::Object ^ get(System::String ^ keyword); void set(System::String ^ keyword, System::Object ^ value); };
public override object this[string keyword] { get; set; }
member this.Item(string) : obj with get, set
Default Public Overrides Property Item(keyword As String) As Object

參數

keyword
String

要取得或設定之項目的索引鍵。

屬性值

與指定之索引鍵關聯的值。

例外狀況

連接字串的格式錯誤 (也許在索引鍵/值組中遺漏了必要的 "=")。

keyword 為 null 參考 (在 Visual Basic 中為 Nothing)。

範例

主控台應用程式中的下列程式碼會建立新的 OdbcConnectionStringBuilder,並使用 Item[] 屬性將索引鍵/值組加入其連接字串。

using System.Data.Odbc;

class Program
{
    static void Main()
    {
        OdbcConnectionStringBuilder builder =
            new OdbcConnectionStringBuilder();
        // Set up a connection string for a text file.
        builder["Driver"] = "Microsoft Text Driver (*.txt; *.csv)";
        builder["dbq"] = "C:\\TextFilesFolder";
        builder["Extension"] = "asc,csv,tab,txt";

        // Overwrite the existing value for the dbq value,
        // because it already exists within the collection.
        builder["dbq"] = "D:\\";

        Console.WriteLine(builder.ConnectionString);
        Console.WriteLine();
        Console.WriteLine("Press Enter to continue.");
        Console.ReadLine();
    }
}
Imports System.Data.Odbc    

Module Module1
  Sub Main()
    Dim builder As New OdbcConnectionStringBuilder
    ' Set up a connection string for a text file.
    builder.Item("Driver") = "Microsoft Text Driver (*.txt; *.csv)"
    ' Note that Item is the default property, so 
    ' you need not include it in the reference.
    builder("dbq") = "C:\TextFilesFolder"
    builder.Item("Extension") = "asc,csv,tab,txt"

    ' Overwrite the existing value for the dbq value, 
    ' because it already exists within the collection.
    builder.Item("dbq") = "D:\"

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

備註

當您設定這個屬性時,如果指定的索引鍵已存在於字典中,則會取代值;否則會建立新的專案。

適用於

另請參閱