Tài liệu Using the Data Link Properties Dialog Box ppt

[ Team LiB ]Recipe 1.13 Using the Data Link Properties Dialog Box Problem You want to display the Data Link Properties dialog box from an application so that users can create their own

[ Team LiB ]

Recipe 1.13 Using the Data Link Properties Dialog Box

Problem

You want to display the Data Link Properties dialog box from an application so that users can create their own database connections just as they can from the Server Explorer window in the Visual Studio NET IDE

Solution

Use COM interop with the OLE DB Service Component to display the Data Link

Properties dialog box

You'll need a reference to the Primary Interop Assembly (PIA) for ADO provided in the

file ADODB.DLL; select adodb from the NET tab in Visual Studio NET's Add

Reference Dialog You'll also need a reference to the Microsoft OLE DB Service

Component 1.0 Type Library from the COM tab in Visual Studio NET's Add Reference Dialog

The sample code contains a single event handler:

Data Link Dialog Button.Click

Creates and displays a Data Link Properties dialog box using the Microsoft OLE

DB Service Component through COM interop

The C# code is shown in Example 1-10

Example 1-10 File: DataLinkDialogForm.cs

// Namespaces, variables, and constants

using System;

//

private void dataLinkDialogButton_Click(object sender, System.EventArgs e)

{

ADODB.Connection conn = new ADODB.Connection( );

object oConn = (object) conn;

MSDASC.DataLinks dlg = new MSDASC.DataLinks( );

dlg.PromptEdit(ref oConn);

connectionStringTextBox.Text = conn.ConnectionString;

}

Discussion

COM interop can open a Data Link Properties dialog box allowing a user to select an OLE DB provider and set its properties You can use the results programmatically to construct the connection string for an ADO.NET connection object at runtime with a GUI (graphical user interface)

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