I am using C# 2005 with the MapPoint control from MapPoint 2006. I
have 2 forms in a MDI container. The sequence I go through is to put
the MapPoint control on Form1. On the load of the app I show Form1 in
the MDI container. Then on click I show Form2 (notice I do not hide
Form1). I then click a button on Form2 to show Form1. When Form1 was
shown the first time it asked me to save it (which was undesireable
behavior) so I put this code in the Form1_Deactivate method:
axMap.ActiveMap.Saved = true;


Now when I go back to Form1 the control is empty and worse yet the
ActiveMap == null. How did the control decide to unload my map? How do
I get around this?
Any help, links, or pointers appreciated.

Hi,

I dont know direct what is wrong, but it should work. I have a few applications where I create new instances of a form with a mappoint control on it, and show them in parallel.

are the forms you create in paralell MDIChildren in an MDIContainer? Also, does one form not have a map point control on it?

Hi,

No, in C# I use SourceForge.net: DockPanel Suite from weifenluo. In Delphi I have MDI forms. All created forms has a control on it at design time.

Originally Posted by ddsoft

I am using C# 2005 with the MapPoint control from MapPoint 2006. I
have 2 forms in a MDI container. The sequence I go through is to put
the MapPoint control on Form1. On the load of the app I show Form1 in
the MDI container. Then on click I show Form2 (notice I do not hide
Form1). I then click a button on Form2 to show Form1. When Form1 was
shown the first time it asked me to save it (which was undesireable
behavior) so I put this code in the Form1_Deactivate method:
axMap.ActiveMap.Saved = true;


Now when I go back to Form1 the control is empty and worse yet the
ActiveMap == null. How did the control decide to unload my map? How do
I get around this?
Any help, links, or pointers appreciated.

I had the same problem. I had to speed up the loading of the map so I loadeda the form when the application started, and then uset Hide() to make it invisible. Well, in that moment MapPoint tryes to be clever and closes the map. So the solution is to set the border to None, and the size to (0,1) so the form becomes virtualy inivisible. Note: when using size (0,0) the application goes crazy and consumes 100% proc power.

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Originally Posted by Marin

I had the same problem. I had to speed up the loading of the map so I loadeda the form when the application started, and then uset Hide() to make it invisible. Well, in that moment MapPoint tryes to be clever and closes the map. So the solution is to set the border to None, and the size to (0,1) so the form becomes virtualy inivisible. Note: when using size (0,0) the application goes crazy and consumes 100% proc power.

I have a few applications where I use the ActiveX control invisible, and I create it in code. No need to put it on a form and this also works. So this looks another approach.

Originally Posted by Wilfried

Hi,

No, in C# I use SourceForge.net: DockPanel Suite from weifenluo. In Delphi I have MDI forms. All created forms has a control on it at design time.

I tryed to use DockPanel but when I try to dock a floating window with a MapPoint control, the control closes the map and then the map dissapears. Have you had the same problem?

Hi,

No I do not have that problem. Very wierd...