Excel.Range.Name gives error an exception

[[email protected]]

Hi All,

I am trying to execute below code but it gives me an COMException

///// Code Start ////
public string GetName(Excel.Range range)
{
try
{
if (range.Name != null)
{
Excel.Name name = range.Name as Name;

if (name.Name != null || name.Name.Length != 0)
{
return name.Name;
}
return string.Empty;
}
return string.Empty;
}
catch(Exception e)
{
return string.Empty;
}
}

///// Code End ////

Now every time my very third line "if (range.Name != null)" gives me
Exception

an exception of type: {System.Runtime.InteropServices.COMException}
occurred

Any suggestions,


thanks & regards,
Rushi

[Dirk Behnke]

Hi,
I don't know how you got your Range object, but I made the following
test code.
The console wait just gives me an opportunity to change the active cell.
If I select a cell with a defined Name, no COMException is thrown.

[STAThread]
static void Main(string[] args)
{
object o =
System.Runtime.InteropServices.Marshal.GetActiveObject("Excel.Application");

Excel._Application excelApp = o as Excel._Application;

// connect to current Excel workBook
Excel.Workbook workBook = excelApp.ActiveWorkbook;


if (workBook == null)
{
throw new ApplicationException("No workbook is currently defined");
}
Excel.Worksheet xlsSheet= (Excel.Worksheet) workBook.ActiveSheet;
Excel.Range xlsRange=(Excel.Range) xlsSheet.Application.ActiveCell ;
Console.WriteLine (GetName(xlsRange));
Console.ReadLine();
xlsRange=(Excel.Range) xlsSheet.Application.ActiveCell ;
Console.WriteLine (GetName(xlsRange));
Console.ReadLine();
}
By the way I have included just to control the exceptions a little better

catch (System.Runtime.InteropServices.COMException exCom)
{
System.Diagnostics.Debug.WriteLine(exCom.Message);
return string.Empty;
}

in your code
Hope it helps to dentify the problem
Dirk

[email protected] wrote:
> Hi All,
>
> I am trying to execute below code but it gives me an COMException
>
> ///// Code Start ////
> public string GetName(Excel.Range range)
> {
> try
> {
> if (range.Name != null)
> {
> Excel.Name name = range.Name as Name;
>
> if (name.Name != null || name.Name.Length != 0)
> {
> return name.Name;
> }
> return string.Empty;
> }
> return string.Empty;
> }
> catch(Exception e)
> {
> return string.Empty;
> }
> }
>
> ///// Code End ////
>
> Now every time my very third line "if (range.Name != null)" gives me
> Exception
>
> an exception of type: {System.Runtime.InteropServices.COMException}
> occurred
>
> Any suggestions,
>
>
> thanks & regards,
> Rushi
>

[[email protected]]

Hi Dirk and Others,

I am creating an Add-in in excel. And I am getting the range(cell) by
writing SheetSelectionChange Event (Delegate) for Excel applicaiton. In
that function I am directly calling GetName function to get the
associate name for that range....Below is code.

It is possible that user might be select more region in Excel. So I am
doing a loop for Area of each calling range.


///Code Start///
//Declaration for delegate
(this.officeApplication as Excel).SheetSelectionChange += new
Excel.AppEvents_SheetSelectionChangeEventHandler(WorkSheetSelectionChange);

//Delegate function
protected void WorkSheetrangeChange(object sh, Excel.Range range)
{
for(int i = 1; i <= range.Areas.Count; i++)
{
for(int rowNo = 1 ; rowNo <= range.Areas[i].Rows.Count; rowNo++)
{
for(int colNo = 1 ; colNo <= range.Areas[i].Columns.Count; colNo++)
{

MessageBox.Show(GetName((Excel.Range)range.Areas[i].Cells[rowNo,colNo]));
}
}
}
}


public string GetName(Excel.Range range)
{
try
{
if (range.Name != null)
{
Excel.Name name = range.Name as Name;

if (name.Name != null || name.Name.Length != 0)
{
return name.Name;
}
return string.Empty;
}
return string.Empty;
}
catch(Exception e)
{
return string.Empty;
}
}

///Code End///


I know, I can do it using excelApplicaiton.Names collection. But I
don't wnat to do that, because using that method I have to look compare
with each cell locaiton. And that is very time consuming.

One thing is clear that this code is working fine for a cell, for which
name is defined.

Thanks
Rushi


Dirk Behnke wrote:
> Hi,
> I don't know how you got your Range object, but I made the following
> test code.
> The console wait just gives me an opportunity to change the active cell.
> If I select a cell with a defined Name, no COMException is thrown.
>
> [STAThread]
> static void Main(string[] args)
> {
> object o =
> System.Runtime.InteropServices.Marshal.GetActiveObject("Excel.Application");
>
> Excel._Application excelApp = o as Excel._Application;
>
> // connect to current Excel workBook
> Excel.Workbook workBook = excelApp.ActiveWorkbook;
>
>
> if (workBook == null)
> {
> throw new ApplicationException("No workbook is currently defined");
> }
> Excel.Worksheet xlsSheet= (Excel.Worksheet) workBook.ActiveSheet;
> Excel.Range xlsRange=(Excel.Range) xlsSheet.Application.ActiveCell ;
> Console.WriteLine (GetName(xlsRange));
> Console.ReadLine();
> xlsRange=(Excel.Range) xlsSheet.Application.ActiveCell ;
> Console.WriteLine (GetName(xlsRange));
> Console.ReadLine();
> }
> By the way I have included just to control the exceptions a little better
>
> catch (System.Runtime.InteropServices.COMException exCom)
> {
> System.Diagnostics.Debug.WriteLine(exCom.Message);
> return string.Empty;
> }
>
> in your code
> Hope it helps to dentify the problem
> Dirk
>
> [email protected] wrote:
> > Hi All,
> >
> > I am trying to execute below code but it gives me an COMException
> >
> > ///// Code Start ////
> > public string GetName(Excel.Range range)
> > {
> > try
> > {
> > if (range.Name != null)
> > {
> > Excel.Name name = range.Name as Name;
> >
> > if (name.Name != null || name.Name.Length != 0)
> > {
> > return name.Name;
> > }
> > return string.Empty;
> > }
> > return string.Empty;
> > }
> > catch(Exception e)
> > {
> > return string.Empty;
> > }
> > }
> >
> > ///// Code End ////
> >
> > Now every time my very third line "if (range.Name != null)" gives me
> > Exception
> >
> > an exception of type: {System.Runtime.InteropServices.COMException}
> > occurred
> >
> > Any suggestions,
> >
> >
> > thanks & regards,
> > Rushi
> >