Simple implementation of the desktop information tool (infotool) in mapxtreme

One way to implement infotool is to use the select tool to call the getinfo method in the toolused event processing function (a self-written method to obtain the attribute information of the current selected set ).
(1) Add the toolused event handler to the delegate in the form constructor:
Public form1 ()
{
Initializecomponent ();
// Add tools_used to toolusedeventhandler to handle the select tool's use Event
Mapcontrol1.tools. Used + = new MapInfo. Tools. toolusedeventhandler (tools_used );
}
(2) set the left mouse button tool as the select tool:
Private void btnselecttool_click (Object sender, eventargs E)
{
Mapcontrol1.tools. leftbuttontool = "select ";
}
(3). In the toolused processing function, if the select tool is used, call the getinfo method:
Private void tools_used (Object sender, MapInfo. Tools. toolusedeventargs E)
{
Switch (E. toolname)
{
Case "select ":
{
// If the select tool used, call getinfo method to show the feature's Information
This. getinfo (this );
// Note: The Break keyword is needed
Break;
}
}
}
(4) the specific implementation of the getinfo method is used to obtain the attribute information of the selected elements of the select tool:
Private void getinfo (Object sender)
{
Listbox1.items. Clear ();
MapInfo. Engine. isession session = MapInfo. Engine. session. Current;
// Specify which layer dose the feature belongs
Featurelayer lyr = mapcontrol1.map. Layers [combobox1.text] As featurelayer;
// Hold the default selection (the features you clicked) in
// Iresultsetfeaturecollection
Iresultsetfeaturecollection RSFC = session. Selections. defaultselection [lyr. Table];

If (RSFC! = NULL) // an exception will be thrown if you remove this if-clause
{
// Go through the default selection-the features
Foreach (feature F in RSFC)
{
// The columns of each feature
Foreach (MapInfo. Data. Column Col in F. columns)
{
// Show each field of every feature
Listbox1.items. Add (string. Format ("{0 }:{ 1}", col. tostring (), f [col. tostring ()]. tostring ()));
}
}
}
}