/// <param name="server">数据库服务器名</param>

    /// <param name="instance">SDE的端口，默认安装时"port:5151"</param>

    /// <param name="user">SDE的用户名</param>

    /// <param name="password">密码</param>

    /// <param name="database">数据库的名字</param>

    /// <param name="version">SDE的版本</param>

    /// <returns></returns>

    public IWorkspace OpenSdeWorkspaceByPropertySet(string server, string instance, string user, string password, string database, string version)

    {

        IPropertySet Propset = new PropertySetClass();

        Propset.SetProperty("SERVER", server);

        Propset.SetProperty("INSTANCE", instance);

        Propset.SetProperty("USER", user);

        Propset.SetProperty("PASSWORD", password);

        Propset.SetProperty("DATABASE", password);

        Propset.SetProperty("VERSION", version);  

        IWorkspaceFactory workspaceFactory = new SdeWorkspaceFactoryClass();

        return workspaceFactory.Open(Propset, );

    }  

/// <param name="connectionString">连接字符串</param>

/// For example, "SERVER=Kona;DATABASE=sde;INSTANCE=5151;USER=Editor;PASSWORD=Editor;VERSION=sde.DEFAULT"

/// <returns></returns>

public IWorkspace OpenSdeWorkspaceByConnectionString(string connectionString)

{

    IWorkspaceFactory2 workspaceFactory = new SdeWorkspaceFactoryClass();

    return workspaceFactory.OpenFromString(connectionString, );

} 

    /// <param name="connectionFile">sde文件</param>

    /// For example, "C:\\Data.sde"

    /// <returns></returns>

    public IWorkspace OpenSdeWorkspaceFromFile(string connectionFile)

    {

        IWorkspaceFactory workspaceFactory = new SdeWorkspaceFactoryClass();

        return workspaceFactory.OpenFromFile(connectionFile, );

    }