无需实际打开数据库即可访问MSAccess属性

时间:2011-02-10 18:34:05

标签: c# ms-access reflection late-binding

我正在尝试访问MS Access属性而不实际打开数据库。

以下是一些可以更好理解的代码:

var processStartInfo = new ProcessStartInfo(args[0]) 
    { 
        WindowStyle = ProcessWindowStyle.Hidden, 
        CreateNoWindow = true
    };

Process.Start(processStartInfo);

application = (Access.Application)Marshal.GetActiveObject("Access.Application");

dao.Property allowByPassKeyProperty = null;

foreach (dao.Property property in application.CurrentDb().Properties)
{
    if (property.Name == "AllowByPassKey")
    {
        allowByPassKeyProperty = property;
        break;
    }
}

我的问题是,在这种情况下,我打开数据库以查找属性(application.CurrentDb()。Properties)并启动MS Access启动。

我想避免所有的启动内容,只需为该属性注入正确的值。

是否可以浏览属性,可能使用反射和后期绑定:http://www.codeproject.com/KB/database/mdbcompact_latebind.aspx

或者还有其他选择可以达到我想要的目的吗?

2 个答案:

答案 0 :(得分:1)

抱歉,我没有详细信息,但考虑使用DAO打开Access数据库(假设它是2007年之前)。 DAO是本机访问/喷码,因此您无需实际启动整个Access应用程序。

我说过的旧的VB.Net(是的,.Net)代码:

m_oEngine = New DAO.DBEngine

m_oEngine.SystemDB = sWorkgroupFile

m_oWorkspace = m_oEngine.CreateWorkspace("My Workspace", sUserName, sPassword, DAO.WorkspaceTypeEnum.dbUseJet)

m_oDatabase = m_oWorkspace.OpenDatabase(sDatabaseFile, bExclusive, bReadOnly)  ' Note DAO docs say the second parameter is for Exclusive

答案 1 :(得分:1)

以防万一有人使用MS Access并且需要相同的程序,这里是代码。

程序可以在MS Access * .mdb,* .mde文件中切换AllowBypassKey属性。仅使用MS Access 2003进行测试。如果您已取消激活该属性,并且您的AutoExec宏非常疯狂,则它非常有用。

namespace ToggleAllowBypassKey
{
    public class Program
    {
        private static DAO.DBEngine dbEngine;

        private static DAO.Database database;

        public static void Main(string[] args)
        {
            try
            {
                if (args.Length == 0)
                {
                    Console.WriteLine("Please enter an MS Access application path as a parameter!");
                    return;
                }

                dbEngine = new DAO.DBEngine();
                database = dbEngine.OpenDatabase(args[0]);

                DAO.Property allowBypassKeyProperty = null;

                foreach (dao.Property property in database.Properties)
                {
                    if (property.Name == "AllowBypassKey")
                    {
                        allowBypassKeyProperty = property;
                        break;
                    }
                }

                if (allowBypassKeyProperty == null)
                {
                    allowBypassKeyProperty = database.CreateProperty("AllowBypassKey", DAO.DataTypeEnum.dbBoolean, false, true);
                    database.Properties.Append(allowBypassKeyProperty);
                    Console.WriteLine("AllowBypassKey Property has been added. It's Value is '" + allowBypassKeyProperty.Value + "'");
                }
                else
                {
                    allowBypassKeyProperty.Value = !allowBypassKeyProperty.Value;
                    Console.WriteLine("AllowBypassKey set to '" + allowBypassKeyProperty.Value + "'!");
                }
            }
            catch(Exception exception)
            {
                Console.WriteLine("Exception Message: " + exception.Message);
                Console.WriteLine("Inner Exception:" + exception.InnerException);
            }
            finally
            {
                database.Close();
                System.Runtime.InteropServices.Marshal.ReleaseComObject(database);
                database = null;

                System.Runtime.InteropServices.Marshal.ReleaseComObject(dbEngine);
                dbEngine = null;

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