/// <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, 0);  }  

/// <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, 0);
} 

    /// <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, 0);  }