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BOOK: Beginning Visual C#
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February 8th, 2006, 06:31 AM
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Authorized User
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Join Date: Dec 2005
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Check if a cell is blank in excel
Hi everyone,
I am having difficulty the the System.NullException error during runtime. As I parse through an excel spreadsheet, the program needs to detect whether a cell contains any value or not. Now I know the particular cell it is trying to read is blank and need to know how to avoid getting the nullexception error (should be some blank checking function). I am not sure if it's the way I search the net but had no luck finding an appropriate solution. Please someone help!!
Here is the code I wrote so far
Code:
try {
if (((Excel.Range)xlSheet.Cells[i, "B"]).Value2.ToString() != null) {
System.Diagnostics.Trace.WriteLine(xlSheet.Cells[i, "B"].ToString());
nominalCode = ((Excel.Range)xlSheet.Cells[i, "B"]).Value2.ToString();
System.Diagnostics.Trace.WriteLine(nominalCode);
}
if (((Excel.Range)xlSheet.Cells[i, "D"]).Value2.ToString() != null) {
nominalCodeName = ((Excel.Range)xlSheet.Cells[i, "D"]).Value2.ToString();
System.Diagnostics.Trace.WriteLine(nominalCodeName);
}
if (((Excel.Range)xlSheet.Cells[i, "E"]).Value2.ToString() != null) {
dept = ((Excel.Range)xlSheet.Cells[i, "E"]).Value2.ToString();
System.Diagnostics.Trace.WriteLine(dept);
}
if (((Excel.Range)xlSheet.Cells[i, "K"]).Value2.ToString() != null) {
balance = Convert.ToInt32(((Excel.Range)xlSheet.Cells[i, "K"]).Value2.ToString());
System.Diagnostics.Trace.WriteLine(balance);
}
else {
balance = 0;
}
if (((Excel.Range)xlSheet.Cells[i, "L"]).Value2.ToString() != null) {
debit = Convert.ToInt32(((Excel.Range)xlSheet.Cells[i, "L"]).Value2.ToString());
System.Diagnostics.Trace.WriteLine(debit);
}
else {
debit = 0;
}
if (((Excel.Range)xlSheet.Cells[i, "Q"]).Value2.ToString() != null) {
credit = Convert.ToInt32(((Excel.Range)xlSheet.Cells[i, "Q"]).Value2.ToString());
System.Diagnostics.Trace.WriteLine(credit);
}
else {
credit = 0;
}
if (((Excel.Range)xlSheet.Cells[i, "S"]).Value2.ToString() != null) {
totalDebit = Convert.ToInt32(((Excel.Range)xlSheet.Cells[i, "S"]).Value2.ToString());
System.Diagnostics.Trace.WriteLine(totalDebit);
}
else {
totalDebit = 0;
}
if (((Excel.Range)xlSheet.Cells[i, "X"]).Value2.ToString() != null) {
totalCredit = Convert.ToInt32(((Excel.Range)xlSheet.Cells[i, "X"]).Value2.ToString());
System.Diagnostics.Trace.WriteLine(totalCredit);
}
else {
totalCredit = 0;
}
DataRow row = fileTable.NewRow();
System.Diagnostics.Trace.WriteLine(nominalCode + " " + nominalCodeName + " " + dept + " " + balance + " " + totalCredit);
// Enter each data into struct
row["NC"] = nominalCode;
row["NCName"] = nominalCodeName;
row["Dept"] = dept;
row["Balance"] = balance;
row["DebitCredit"] = debit - credit;
row["totalDebitCredit"] = totalDebit - totalCredit;
fileTable.Rows.Add(row);
}
catch (Exception err) {
System.Console.WriteLine("{0} Exception caught.", err);
}
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February 8th, 2006, 10:50 AM
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Authorized User
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Join Date: Dec 2005
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Found the solution, or atleast something that works.
Change the red bit to the following
Code:
Excel.Range)xlSheet.Cells[i, "E"]).Value2 != null
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November 9th, 2006, 08:44 AM
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Registered User
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Join Date: Nov 2006
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So, all you did was remove the .ToString() ?
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March 5th, 2009, 05:53 AM
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Registered User
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Join Date: Mar 2009
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Check blank excel sheet Cell in c#
Check the condition like this
((Excel.Range)xlSheet.Cells[i, "B"]).Value2 != null)
not like
((Excel.Range)xlSheet.Cells[i, "B"]).Value2.ToString() != null)
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March 5th, 2009, 05:54 AM
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Registered User
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Join Date: Mar 2009
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
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Check blank excel sheet Cell in c#
Check the condition like this
((Excel.Range)xlSheet.Cells[i, "B"]).Value2 != null)
not like
((Excel.Range)xlSheet.Cells[i, "B"]).Value2.ToString() != null)
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