cannot use var in a application

maanikmca · November 15th, 2010, 03:39 AM

i have downloaded 1 application depends on visual studio 2008 but i convert the app into studio 2005, now hey triggering error like "var could not be found"

so what the other way to create variable without using var,

because am working on GMap.net? thats the problem?

please sort out my issue?

Imar · November 15th, 2010, 04:12 AM

Hi there,

It depends on the exact cause of the problem. If the code was using var just to avoid specifying the type, you can manually fix it. E.g.:

Code:

 
var firstName = "Whatever";
var age = 20;

Can be replaced with:

Code:

 
string firstName = "Whatever";
int age = 20;

However, if the code assigns an anonymous type to the variable declared with var, it's not so easy to fix.

But why don't you download and install the free Visual Studio Express 2008 or even 2010 editions?

Imar

maanikmca · November 15th, 2010, 07:13 AM

i need to deploy my application into CE device so i should work with .net framework 2 for that am struggling otherwise i can use 2008 only, string and int is ok, but i have different type of variable. thats the problem triggering here?

whats the solution for this?

Imar · November 15th, 2010, 07:29 AM

Quote:

whats the solution for this?

It depends on the actual code. Can you post some short samples of code that is causing problems?

Imar

maanikmca · November 15th, 2010, 07:54 AM

Its one of coding in one of file troubling me ?

Code:

#if !ContinuesMap

                     //Tile t = Core.Matrix.GetTileWithNoLock(Core.Zoom, tilePoint);
#else
                     Tile t = Core.Matrix.GetTileWithNoLock(Core.Zoom, tileToDraw);
#endif
//                     if(t != null)
//                     {
//                        // render tile
//                        lock(t.Overlays)
//                        {
//                           foreach(WindowsFormsImage img in t.Overlays)
//                           {
//                              if(img != null && img.Img != null)
//                              {
//                                 if(!found)
//                                    found = true;
//#if !PocketPC
//                                 g.DrawImage(img.Img, Core.tileRect.X, Core.tileRect.Y, Core.tileRect.Width, Core.tileRect.Height);
//#else
//                                 g.DrawImage(img.Img, Core.tileRect.X, Core.tileRect.Y);
//#endif
//                              }
//                           }
//                        }
//                     }

                     // add text if tile is missing
                     if(!found)
                     {
                        lock(Core.FailedLoads)
                        {
                           //var lt = new LoadTask(tilePoint, Core.Zoom);
                           //if(Core.FailedLoads.ContainsKey(lt))
                           {
                              //var ex = Core.FailedLoads[lt];
#if !PocketPC
                              g.FillRectangle(EmptytileBrush, new RectangleF(Core.tileRect.X, Core.tileRect.Y, Core.tileRect.Width, Core.tileRect.Height));

                              //g.DrawString("Exception: " + ex.Message, MissingDataFont, Brushes.Red, new RectangleF(Core.tileRect.X + 11, Core.tileRect.Y + 11, Core.tileRect.Width - 11, Core.tileRect.Height - 11));

                              g.DrawString(EmptyTileText, MissingDataFont, Brushes.Blue, new RectangleF(Core.tileRect.X, Core.tileRect.Y, Core.tileRect.Width, Core.tileRect.Height), CenterFormat);

#else
                              g.FillRectangle(EmptytileBrush, new System.Drawing.Rectangle(Core.tileRect.X, Core.tileRect.Y, Core.tileRect.Width, Core.tileRect.Height));

                              //g.DrawString("Exception: " + ex.Message, MissingDataFont, TileGridMissingTextBrush, new RectangleF(Core.tileRect.X + 11, Core.tileRect.Y + 11, Core.tileRect.Width - 11, Core.tileRect.Height - 11));

                              g.DrawString(EmptyTileText, MissingDataFont, TileGridMissingTextBrush, new RectangleF(Core.tileRect.X, Core.tileRect.Y + Core.tileRect.Width/2 + (ShowTileGridLines? 11 : -22), Core.tileRect.Width, Core.tileRect.Height), BottomFormat);
#endif

                              g.DrawRectangle(EmptyTileBorders, Core.tileRect.X, Core.tileRect.Y, Core.tileRect.Width, Core.tileRect.Height);
                           }
                       }
                     }

                     if(ShowTileGridLines)
                     {
                        g.DrawRectangle(EmptyTileBorders, Core.tileRect.X, Core.tileRect.Y, Core.tileRect.Width, Core.tileRect.Height);
                        {
#if !PocketPC
                           //g.DrawString((tilePoint == Core.centerTileXYLocation? "CENTER: " :"TILE: ") + tilePoint, MissingDataFont, Brushes.Red, new RectangleF(Core.tileRect.X, Core.tileRect.Y, Core.tileRect.Width, Core.tileRect.Height), CenterFormat);
#else
                           //g.DrawString((tilePoint == Core.centerTileXYLocation? "" :"TILE: ") + tilePoint, MissingDataFont, TileGridLinesTextBrush, new RectangleF(Core.tileRect.X, Core.tileRect.Y, Core.tileRect.Width, Core.tileRect.Height), CenterFormat);
#endif
                        }
                     }
                  }
               }
            //}
         }
         finally
         {
            Core.tileDrawingListLock.ReleaseReaderLock();
            Core.Matrix.LeaveReadLock();
         }
      }

due to the error i make them as comment line Sir ?

Imar · November 15th, 2010, 08:03 AM

Hi there,

You need to look at the return types of the methods you're calling when using var. E.g.:

Code:

 
var lt = new LoadTask(tilePoint, Core.Zoom);
...
var ex = Core.FailedLoads[lt];

It all depends on what LoadTask and FailedLoads return. If they, for example, return a LoadTask and an Exception respectively, you could rewrite it as:

Code:

 
LoadTask lt = new LoadTask(tilePoint, Core.Zoom);
...
Exception ex = Core.FailedLoads[lt];

IntelliSense can tell you what these methods return.

Cheers,

Imar

maanikmca · November 15th, 2010, 08:26 AM

Thank alot for your reply Sir,

Code:

foreach (var tilePoint in Core.tileDrawingList)

for this kinda code how can we find the datatype Sir, and please teach me how to use Intellisense Sir. Please

Imar · November 15th, 2010, 08:37 AM

Quote:

and please teach me how to use Intellisense

Just hover your mouse over an object or method call and you'll see a tooltip appear that describes the type.

Quote:

for this kinda code how can we find the datatype

You need to look at the definition of Core.tileDrawingList; it's probably a collection or an enumarable of some sort which may show you the type it is returning. If you have the source or documentation, this may be easy to find out. Otherwise, take a look at Red Gate's Reflector which enables you to look at the source of DLLs files.

Cheers,

Imar

maanikmca · November 15th, 2010, 08:51 AM

Hello Sir,

While hover in that Core.tileDrawingList it shows [ Systems.Collections.Generic.List<Gmap.Net.Point>Co re.tileDrawingList]

Sir,

so how can i intialize the variable of this loop

foreach(var tilepoint in Core.tileDrawingList) ?

Imar · November 15th, 2010, 09:05 AM

Take a look at this:

Code:

 
Systems.Collections.Generic.List<Gmap.Net.Point>

This returns a list of Gmap.Net.Point objects, so each item in the list is a Gmap.Net.Point.

Does that help?

Imar