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7.8

C#, ASP.NET, Internet Explorer 7, Cannot evaluate expression because a thread is stopped at a point where garbage collection is impossible, possibly because the code is optimized.

Asked by Datheon in Programming for ASP.NET, Microsoft Visual C#.Net

Tags: C#, Internet Explorer 7, Cannot evaluate expression because a thread is stopped at a point where garbage collection is impossible, possibly because the code is optimized.

Hello.
I'm building an application in ASP.NET 2.0 and I'm making an option to upload an excel file and insert the data from the first sheet of the excel file into the database. I'm using the office12.dll to be able to open the excel file. I use 3 methods: btnUpload_Click(), ExcelScanIntenal() and ProcessObjects().

I run the aplication in debug mode with a breakpoint in the btnUpload_Click method and when I try to see the value of any of the properties of the school object I get this message: "Cannot evaluate expression because a thread is stopped at a point where garbage collection is impossible, possibly because the code is optimized.".

Because of this whenever I try to do something with the school object (like comparing the values of some of the properties with some other data) it fails.

I don't know what it means and how to solve the problem.

Thanks.

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             Application excelApp;
 
protected void Page_Load(object sender, EventArgs e)
{
    excelApp = new Application();
}
protected void btnUpload_Click(object sender, EventArgs e)
{
    if (radUpload.UploadedFiles.Count > 0)
    {
        foreach (Telerik.Web.UI.UploadedFile file in radUpload.UploadedFiles)
            {
                Workbook workBook = excelApp.Workbooks.Open(file.FileName, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
 
                School school =  ExcelScanIntenal(workBook); 
                workBook.Close(false, file.FileName, null);
                Marshal.ReleaseComObject(workBook);
 
                bool insert = false;
                SmaakLessenDataContext db = new SmaakLessenDataContext();
 
                foreach (SchoolTonen schoolTonen in GetSchoolQueryable())
                {
	           //here is where the comparison takes place
                    if (Convert.ToDateTime(schoolTonen.InschrijfDatum) == Convert.ToDateTime(school.InschrijfDatum))
                        {
                            insert = true;
                            if (schoolTonen.BezoekAdres == school.BezoekAdres)
                            {
                                insert = false;
                                break;
                            }
                        }
                    }
                    try
                    {
                        if (insert)
                        {
                             //insert data into the database
                        }
                    }
                    catch
                    {
 
                    }
                }
            }
        }
 
private School ExcelScanIntenal(Workbook workBookIn)
{
    Worksheet sheet = (Worksheet)workBookIn.Sheets[1];
    Range excelRange = sheet.UsedRange;
    object[,] valueArray = (object[,])excelRange.get_Value(XlRangeValueDataType.xlRangeValueDefault);
    return ProcessObjects(valueArray);
}
 
private School ProcessObjects(object[,] valueArray)
{
    School school = new School();
 
    for (int row = 2; row <= valueArray.GetLength(0); row++)
    {
        school.Naam = (string)valueArray[row, 1];
        school.BezoekAdres = (string)valueArray[row, 2];
			.
			.
			.
    }
    return school;
 }
           
         

20091111-EE-VQP-89 / EE_QW_2_20070628

C#, ASP.NET, Internet Explorer 7, Cannot evaluate expression because a thread is stopped at a point where garbage collection is impossible, possibly because the code is optimized.

Asked by Datheon in Programming for ASP.NET, Microsoft Visual C#.Net

Tags: C#, Internet Explorer 7, Cannot evaluate expression because a thread is stopped at a point where garbage collection is impossible, possibly because the code is optimized.

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