Problem with the Return statement

Hi,

I have this code below to show de SaveFileDialog when these requirements are not met:

   if (gvSelected != null && gvSelected.DataRowCount == 0) return;

But after pressing on the button to test it still shows de SaveFileDialog.

What do I do wrong?

   private void bbExport_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
        {
            GridView gvSelected = null;
            if (tbclMain.SelectedTabPage.Equals(tbshGlucs)) gvSelected = gridView1;
            else if (tbclMain.SelectedTabPage.Equals(tbshSupp)) gvSelected = gridView2;
            else if (tbclMain.SelectedTabPage.Equals(tbshFavor)) gvSelected = gridView3;
            if (gvSelected != null && gvSelected.DataRowCount == 0) return;
            SaveFileDialog saveFD = new SaveFileDialog();
            saveFD.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
            saveFD.Filter = "txt files (*.txt)|*.txt|csv files (*.csv)|*.csv|xls files (*.xls)|*.xls|pdf files (*.pdf)|*.pdf|HTML files (*.htm)|*.htm";
            saveFD.DefaultExt = ".txt";
            if (saveFD.ShowDialog() == DialogResult.OK)
            {
                switch (saveFD.FilterIndex)
                {
                    case 1:
                        try
                        { gvSelected.ExportToText(saveFD.FileName); }
                        catch (Exception ex)
                        { XtraMessageBox.Show(ex.ToString()); }
                        break;
                    case 2:
                        try
                        { gvSelected.ExportToCsv(saveFD.FileName); }
                        catch (Exception ex)
                        { XtraMessageBox.Show(ex.ToString()); }
                        break;
                    case 3:
                        try
                        { gvSelected.ExportToXls(saveFD.FileName); }
                        catch (Exception ex)
                        { XtraMessageBox.Show(ex.ToString()); }
                        break;
                    case 4:
                        try
                        { gvSelected.ExportToPdf(saveFD.FileName); }
                        catch (Exception ex)
                        { XtraMessageBox.Show(ex.ToString()); }
                        break;
                    case 5:
                        try
                        { gvSelected.ExportToHtml(saveFD.FileName); }
                        catch (Exception ex)
                        { XtraMessageBox.Show(ex.ToString()); }
                        break;
                }
            }
        }

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Peter
LVL 1
peterkiersAsked:
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Robert SchuttConnect With a Mentor Software EngineerCommented:
Try this:
if (gvSelected == null || gvSelected.DataRowCount == 0) return;

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0
 
AndyAinscowFreelance programmer / ConsultantCommented:
put a breakpoint on the line:
SaveFileDialog saveFD = new SaveFileDialog();

Now have a look at what the values of gvSelected are (If it is null then the return will not be called because of your && in the if statement - did you want an or || at that point? )
0
 
Robert SchuttSoftware EngineerCommented:
PS: explanation: you want to continue with the code when 1 of the 3 grids is selected and the selected grid has rows. So you want to exit if the opposite is true, with boolean logic applied this means both parts are negated and operators and/or are switched around, so
if (!(gvSelected != null && gvSelected.DataRowCount != 0)) return;

Open in new window

would be the same but can be shortened to what I posted before. In your code both parts needed to be true but that meant you didn't check for the situation that none of the three grids were selected.
0
 
peterkiersAuthor Commented:
Thanks. Peter
0
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