Block copy of Datatable to Excel Spreadsheet using C#
I am currently copying data from a DataTable to an Excel spreadsheet on a
cell by cell basis. I would like to speed things up by doing this on a row by row basis or one big block copy. I can't seem to be able to figure out on how to do this on a row by row basis or by one single command. Can anyone supply a snippet of how this can be performed? Thanks! |
Block copy of Datatable to Excel Spreadsheet using C#
I used the code from this web site, it uses copyfromrecordset in Excel. Works
well http://www.codeproject.com/cs/databa...oRecordset.asp "Peter S." wrote: I am currently copying data from a DataTable to an Excel spreadsheet on a cell by cell basis. I would like to speed things up by doing this on a row by row basis or one big block copy. I can't seem to be able to figure out on how to do this on a row by row basis or by one single command. Can anyone supply a snippet of how this can be performed? Thanks! |
Block copy of Datatable to Excel Spreadsheet using C#
I'm not sure exactly what the code would be in C#, but all you need is
to get the excel workbook object and then set an array equal to the range of cells you're wanting to pull. Assuming you already have the workbook object (let's say MyWorkbook) since you're already pulling cell by cell: Dim arrRange arrRange = MyWorkbook.Range("A1:C10") On Oct 30, 8:33 am, Peter S. wrote: I am currently copying data from a DataTable to an Excel spreadsheet on a cell by cell basis. I would like to speed things up by doing this on a row by row basis or one big block copy. I can't seem to be able to figure out on how to do this on a row by row basis or by one single command. Can anyone supply a snippet of how this can be performed? Thanks! |
Block copy of Datatable to Excel Spreadsheet using C#
Oh, I totally misunderstood the question. My apologies...
On Oct 30, 8:48 am, " wrote: I'm not sure exactly what the code would be in C#, but all you need is to get the excel workbook object and then set an array equal to the range of cells you're wanting to pull. Assuming you already have the workbook object (let's say MyWorkbook) since you're already pulling cell by cell: Dim arrRange arrRange = MyWorkbook.Range("A1:C10") On Oct 30, 8:33 am, Peter S. wrote: I am currently copying data from a DataTable to an Excel spreadsheet on a cell by cell basis. I would like to speed things up by doing this on a row by row basis or one big block copy. I can't seem to be able to figure out on how to do this on a row by row basis or by one single command. Can anyone supply a snippet of how this can be performed? Thanks!- Hide quoted text - - Show quoted text - |
Block copy of Datatable to Excel Spreadsheet using C#
Sorry I should have said you can use copyfrom recordset with the function
something like: Range("A1").CopyFromRecordset(ConvertToRecordset(t ableToCopy)) "Peter S." wrote: I am currently copying data from a DataTable to an Excel spreadsheet on a cell by cell basis. I would like to speed things up by doing this on a row by row basis or one big block copy. I can't seem to be able to figure out on how to do this on a row by row basis or by one single command. Can anyone supply a snippet of how this can be performed? Thanks! |
Block copy of Datatable to Excel Spreadsheet using C#
However, in spite of misreading your question, I don't think the
content of the link posted addresses it either. Perhaps if you can get the contents of the datatable into an array (or it might work straight from the datatable if the Excel object recognizes it as an array), you can simply set the Excel Range equal to your array. Kind of the reverse of what I posted in the first place. You just have to specify the range specifically. For example if your datatable has 5 columns and however many rows: MyWorkbook.Range("A1:E" & ubound(YourZeroBasedArray)+1) = YourZeroBasedArray On Oct 30, 8:48 am, " wrote: I'm not sure exactly what the code would be in C#, but all you need is to get the excel workbook object and then set an array equal to the range of cells you're wanting to pull. Assuming you already have the workbook object (let's say MyWorkbook) since you're already pulling cell by cell: Dim arrRange arrRange = MyWorkbook.Range("A1:C10") On Oct 30, 8:33 am, Peter S. wrote: I am currently copying data from a DataTable to an Excel spreadsheet on a cell by cell basis. I would like to speed things up by doing this on a row by row basis or one big block copy. I can't seem to be able to figure out on how to do this on a row by row basis or by one single command. Can anyone supply a snippet of how this can be performed? Thanks!- Hide quoted text - - Show quoted text - |
Block copy of Datatable to Excel Spreadsheet using C#
This is an interesting solution, thanks for the response. Do I have to go
through some hoops to convert the DataTable to a recordset? It seems like it is not a straighforward process. I am wondering if the conversion (to a recordset) might only be somewhat more efficient than populating each cell individually?? It would be optimal if I could use the DataTable without conversion/modifications.... "Ralph" wrote: Sorry I should have said you can use copyfrom recordset with the function something like: Range("A1").CopyFromRecordset(ConvertToRecordset(t ableToCopy)) "Peter S." wrote: I am currently copying data from a DataTable to an Excel spreadsheet on a cell by cell basis. I would like to speed things up by doing this on a row by row basis or one big block copy. I can't seem to be able to figure out on how to do this on a row by row basis or by one single command. Can anyone supply a snippet of how this can be performed? Thanks! |
Block copy of Datatable to Excel Spreadsheet using C#
It did not seem liike a good alternative to me either. But after testing it
on a datatable that was copying over 2,000 records I noticed a significant improvement. I copied both of the functions from the web page to a new class module in my project then used the Range("A1").CopyFromRecordset(ConvertToRecordset(t ableToCopy)) in place of looping through each row in the datatable. "Peter S." wrote: This is an interesting solution, thanks for the response. Do I have to go through some hoops to convert the DataTable to a recordset? It seems like it is not a straighforward process. I am wondering if the conversion (to a recordset) might only be somewhat more efficient than populating each cell individually?? It would be optimal if I could use the DataTable without conversion/modifications.... "Ralph" wrote: Sorry I should have said you can use copyfrom recordset with the function something like: Range("A1").CopyFromRecordset(ConvertToRecordset(t ableToCopy)) "Peter S." wrote: I am currently copying data from a DataTable to an Excel spreadsheet on a cell by cell basis. I would like to speed things up by doing this on a row by row basis or one big block copy. I can't seem to be able to figure out on how to do this on a row by row basis or by one single command. Can anyone supply a snippet of how this can be performed? Thanks! |
Block copy of Datatable to Excel Spreadsheet using C#
Your right! I tried it and as soon as I pulled the records from the database
the Excel spreadsheet was built instantaneously! This is definitely much faster! Whereas before it would take at least 15 seconds minimum. For everyone's information I also needed to include the COM reference: Microsoft ActiveX Data Objects 2.8 Library in addition to the two functions you posted in the first reply. Thanks again!!!! Here is what I used for code (I started at A2 because I write column headers in the spreadsheet) Excel.Range tableRange = excelApp.get_Range("A2","A2"); tableRange.CopyFromRecordset(ConvertToRecordset(da taTbl),dataTbl.Rows.Count,dataTbl.Columns.Count); ================================================== === "Ralph" wrote: It did not seem liike a good alternative to me either. But after testing it on a datatable that was copying over 2,000 records I noticed a significant improvement. I copied both of the functions from the web page to a new class module in my project then used the Range("A1").CopyFromRecordset(ConvertToRecordset(t ableToCopy)) in place of looping through each row in the datatable. "Peter S." wrote: This is an interesting solution, thanks for the response. Do I have to go through some hoops to convert the DataTable to a recordset? It seems like it is not a straighforward process. I am wondering if the conversion (to a recordset) might only be somewhat more efficient than populating each cell individually?? It would be optimal if I could use the DataTable without conversion/modifications.... "Ralph" wrote: Sorry I should have said you can use copyfrom recordset with the function something like: Range("A1").CopyFromRecordset(ConvertToRecordset(t ableToCopy)) "Peter S." wrote: I am currently copying data from a DataTable to an Excel spreadsheet on a cell by cell basis. I would like to speed things up by doing this on a row by row basis or one big block copy. I can't seem to be able to figure out on how to do this on a row by row basis or by one single command. Can anyone supply a snippet of how this can be performed? Thanks! |
Block copy of Datatable to Excel Spreadsheet using C#
One small note, I set a breakpoint on the TranslateType function and noticed
when it receives a type of Decimal it returns adCurrency. So that looked great however I noticed that all my data shows up with a cell format of General. Is this something that is out of my control? "Peter S." wrote: Your right! I tried it and as soon as I pulled the records from the database the Excel spreadsheet was built instantaneously! This is definitely much faster! Whereas before it would take at least 15 seconds minimum. For everyone's information I also needed to include the COM reference: Microsoft ActiveX Data Objects 2.8 Library in addition to the two functions you posted in the first reply. Thanks again!!!! Here is what I used for code (I started at A2 because I write column headers in the spreadsheet) Excel.Range tableRange = excelApp.get_Range("A2","A2"); tableRange.CopyFromRecordset(ConvertToRecordset(da taTbl),dataTbl.Rows.Count,dataTbl.Columns.Count); ================================================== === "Ralph" wrote: It did not seem liike a good alternative to me either. But after testing it on a datatable that was copying over 2,000 records I noticed a significant improvement. I copied both of the functions from the web page to a new class module in my project then used the Range("A1").CopyFromRecordset(ConvertToRecordset(t ableToCopy)) in place of looping through each row in the datatable. "Peter S." wrote: This is an interesting solution, thanks for the response. Do I have to go through some hoops to convert the DataTable to a recordset? It seems like it is not a straighforward process. I am wondering if the conversion (to a recordset) might only be somewhat more efficient than populating each cell individually?? It would be optimal if I could use the DataTable without conversion/modifications.... "Ralph" wrote: Sorry I should have said you can use copyfrom recordset with the function something like: Range("A1").CopyFromRecordset(ConvertToRecordset(t ableToCopy)) "Peter S." wrote: I am currently copying data from a DataTable to an Excel spreadsheet on a cell by cell basis. I would like to speed things up by doing this on a row by row basis or one big block copy. I can't seem to be able to figure out on how to do this on a row by row basis or by one single command. Can anyone supply a snippet of how this can be performed? Thanks! |
Block copy of Datatable to Excel Spreadsheet using C#
set a range variable for the columns to format then use numberformat:
tablerange.NumberFormat= "$#,##0.00" "Peter S." wrote: One small note, I set a breakpoint on the TranslateType function and noticed when it receives a type of Decimal it returns adCurrency. So that looked great however I noticed that all my data shows up with a cell format of General. Is this something that is out of my control? "Peter S." wrote: Your right! I tried it and as soon as I pulled the records from the database the Excel spreadsheet was built instantaneously! This is definitely much faster! Whereas before it would take at least 15 seconds minimum. For everyone's information I also needed to include the COM reference: Microsoft ActiveX Data Objects 2.8 Library in addition to the two functions you posted in the first reply. Thanks again!!!! Here is what I used for code (I started at A2 because I write column headers in the spreadsheet) Excel.Range tableRange = excelApp.get_Range("A2","A2"); tableRange.CopyFromRecordset(ConvertToRecordset(da taTbl),dataTbl.Rows.Count,dataTbl.Columns.Count); ================================================== === "Ralph" wrote: It did not seem liike a good alternative to me either. But after testing it on a datatable that was copying over 2,000 records I noticed a significant improvement. I copied both of the functions from the web page to a new class module in my project then used the Range("A1").CopyFromRecordset(ConvertToRecordset(t ableToCopy)) in place of looping through each row in the datatable. "Peter S." wrote: This is an interesting solution, thanks for the response. Do I have to go through some hoops to convert the DataTable to a recordset? It seems like it is not a straighforward process. I am wondering if the conversion (to a recordset) might only be somewhat more efficient than populating each cell individually?? It would be optimal if I could use the DataTable without conversion/modifications.... "Ralph" wrote: Sorry I should have said you can use copyfrom recordset with the function something like: Range("A1").CopyFromRecordset(ConvertToRecordset(t ableToCopy)) "Peter S." wrote: I am currently copying data from a DataTable to an Excel spreadsheet on a cell by cell basis. I would like to speed things up by doing this on a row by row basis or one big block copy. I can't seem to be able to figure out on how to do this on a row by row basis or by one single command. Can anyone supply a snippet of how this can be performed? Thanks! |
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