这里有新的VB程序员。我使用下面的方法将SQL表导出到Excel文件。但是，当我在excel中创建文件时，由于转换为数字而不是文本，我的主键的前导零缺失。这是由于来自数据表的信息优于excel。我想知道我能做些什么来保持我的领先零。
仅供参考 - 我的主键是6位数字，只有少数几位在它们的开头缺少一个0。在第一列完成后，还有许多其他列和行可以放入excel文件中。它只是我需要以某种方式更改格式的第一列主键。
另外，我正在使用这个excel文件然后上传到SQL，并且在我的程序创建新记录的某些主键上缺少0。
我在想这里可能会发生主要的变化，但我无法弄清楚如何做到这一点：
'Export the Columns to excel file
For Each dc In datatableMain.Columns
colIndex = colIndex + 1
oSheet.Cells(1, colIndex) = dc.ColumnName
Next
For Each dr In datatableMain.Rows
rowIndex = rowIndex + 1
colIndex = 1
For Each dc In datatableMain.Columns
colIndex = colIndex + 1
oSheet.Cells(rowIndex + 1, colIndex) = dr(dc.ColumnName)
Next
Next
下面的完整代码：
Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
Dim dataAdapter As New SqlClient.SqlDataAdapter()
Dim dataSet As New DataSet
Dim command As New SqlClient.SqlCommand
Dim datatableMain As New System.Data.DataTable()
Dim connection As New SqlClient.SqlConnection
connection.ConnectionString = "Server=myserver;Database=mydatabase;User Id=xxxx;Password=xxxxx"
command.Connection = connection
command.CommandType = CommandType.Text
'You can use any command select
command.CommandText = "Select * from MYTABLE"
dataAdapter.SelectCommand = command
Dim f As FolderBrowserDialog = New FolderBrowserDialog
Try
If f.ShowDialog() = DialogResult.OK Then
'This section help you if your language is not English.
System.Threading.Thread.CurrentThread.CurrentCulture = _
System.Globalization.CultureInfo.CreateSpecificCulture("en-US")
Dim oExcel As Excel.Application
Dim oBook As Excel.Workbook
Dim oSheet As Excel.Worksheet
oExcel = CreateObject("Excel.Application")
oBook = oExcel.Workbooks.Add(Type.Missing)
oSheet = oBook.Worksheets(1)
Dim dc As System.Data.DataColumn
Dim dr As System.Data.DataRow
Dim colIndex As Integer = 0
Dim rowIndex As Integer = 0
'Fill data to datatable
connection.Open()
dataAdapter.Fill(datatableMain)
connection.Close()
'Export the Columns to excel file
For Each dc In datatableMain.Columns
colIndex = colIndex + 1
oSheet.Cells(1, colIndex) = dc.ColumnName
Next
For Each dr In datatableMain.Rows
rowIndex = rowIndex + 1
colIndex = 1
For Each dc In datatableMain.Columns
colIndex = colIndex + 1
oSheet.Cells(rowIndex + 1, colIndex) = dr(dc.ColumnName)
Next
Next
'Set final path
Dim fileName As String = "\" + fname.Text + ".xlsx"
Dim finalPath = f.SelectedPath + fileName
txtPath.Text = finalPath
oSheet.Columns.AutoFit()
'Save file in final path
oBook.SaveAs(finalPath, Excel.XlFileFormat.xlOpenXMLWorkbook, Type.Missing, _
Type.Missing, Type.Missing, Type.Missing, Excel.XlSaveAsAccessMode.xlExclusive, _
Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing)
'Release the objects
ReleaseObject(oSheet)
oBook.Close(False, Type.Missing, Type.Missing)
ReleaseObject(oBook)
oExcel.Quit()
ReleaseObject(oExcel)
'Some time Office application does not quit after automation:
'so i am calling GC.Collect method.
GC.Collect()
MessageBox.Show("Exported!")
End If
Catch ex As Exception
MessageBox.Show(ex.Message, "Warning", MessageBoxButtons.OK)
End Try
End If
End Sub
Private Sub ReleaseObject(ByVal o As Object)
Try
While (System.Runtime.InteropServices.Marshal.ReleaseComObject(o) > 0)
End While
Catch
Finally
o = Nothing
End Try
End Sub
答案 0 :(得分：3)
我实际上在10分钟前遇到过类似的问题！我需要从一本书到另一本书获得一个30位数的数字，这一切都在溢出。尝试在写入单元格之前设置列的格式。我的代码是Worksheets(i).Range("D:D").NumberFormat = "@"这将告诉Excel“按原样”混合数据，而不是试图猜测你想要的是什么。
答案 1 :(得分：0)
我发现这个问题希望在我拥有的一个通用函数中解决同样的问题，这是我创建的几个程序所使用的。由于各种各样的数据源，我无法对要设置NumberFormat的列进行硬编码。为了解决这个问题，我利用循环来输出列标题。对于那些需要更多动态解决方案的人来说，我的代码如下。请注意，有几个参考EL＆＃39; EL＆＃39;这是同一解决方案中的自定义错误记录对象的实例，可以忽略/修改：
''' <summary>
''' Function to take a data table and output its contents to an Excel spreadsheet. Returns a string with any errors (Nothing if successful)
''' </summary>
''' <param name="D">The datatable to be output</param>
''' <param name="epath">The full file path to log errors to</param>
''' <param name="SAName">The full file path to save the created Excel workbook to</param>
''' <param name="Parent">The function calling for data to be output</param>
''' <returns></returns>
''' <remarks></remarks>
Public Function ResOut(ByVal D As DataTable, ByVal epath As String, ByVal SAName As String, ByVal Parent As String) As String
'
Dim res As String = ""
Dim E As New Microsoft.Office.Interop.Excel.Application
Dim wb As Microsoft.Office.Interop.Excel.Workbook = Nothing
Dim ws As Microsoft.Office.Interop.Excel.Worksheet = Nothing
Dim x As Long = 0
Dim f As Long = 1
Dim Rng As Microsoft.Office.Interop.Excel.Range = Nothing
Dim q As String
Dim Str_Columns As New List(Of String) 'Holds the list of column letters that need forced to Text format in order to retain leading zeroes in the data
'that will be placed there
'Check that the passed in table has data
If D.Rows.Count = 0 Then
res = "No data was returned by " & Parent
End If
If res = "" Then
'Create a workbook for the data and capture the workbook and sheet for ease of reference
Try
wb = E.Workbooks.Add
ws = wb.Worksheets(1)
'Define the range
q = ColNumToStr(D.Columns.Count, epath)
Rng = ws.Range("A2:" & q & D.Rows.Count + 1)
Catch ex As Exception
res = "Encountered an error while creating the new workbook to export the results to. No data can be returned."
EL.AddErr(res & " ResOut was called by " & Parent & ". Error Details: " & ex.Message, epath)
End Try
'Fill in headers
If res = "" Then
Try
For Each c As DataColumn In D.Columns
ws.Range("A1").Offset(0, x).Value = c.ColumnName
x = x + 1
Next
Catch ex As Exception
res = "Encountered an error while filling in the column headers. This will prevent any data from being returned."
EL.AddErr(res & " ResOut was called by " & Parent & ". Error Details: " & ex.Message, epath)
End Try
End If
'Setup the step & frequency for the Step Progress bar
'Dim t() As Long = s.StatSetup(QR.Rows.Count, 58, "Query Runner\ResOut\" & QName, Replace(My.Settings.EPath, "<user>", Environment.UserName) & DStamp() & " Query Scheduler Log.txt")
'f = t(0)
'SProg.Step = t(1)
'Create the array
Dim OArr(D.Rows.Count, x) As Object
'Convert the datatable to a 2D array
If res = "" Then
Try
'Fill it
x = 0
For r As Long = 0 To D.Rows.Count - 1 Step 1
Dim dr As DataRow = D.Rows(r)
For c As Integer = 0 To D.Columns.Count - 1 Step 1
OArr(r, c) = dr.Item(c).ToString
'Check if this item is a # with leading zeroes (making sure we haven't already added the column to the list of such columns)
If Not (Str_Columns.Contains(ColNumToStr(c + 1, epath))) And Strings.Left(dr.Item(c), 1) = "0" Then
Str_Columns.Add(ColNumToStr(c + 1, epath))
End If 'else the column is in the list already or the item does not dictate it's inclusion
Next
x = x + 1
Next
Catch ex As Exception
res = "Encountered an error while outputing the " & x + 1 & "-th record of " & D.Rows.Count & ". No data will be output."
EL.AddErr(res & " ResOut was called by " & Parent & ". Error Details: " & ex.Message, epath)
End Try
End If
'output the array to the target range
If res = "" Then
'First force Text format where needed to retain leading zeroes
Try
For Each c As String In Str_Columns
q = c
ws.Range(c & ":" & c).NumberFormat = "@"
Next
Catch ex As Exception
res = "Encountered an error while changing column " & q & " to TEXT in order to retain leading zeroes in the " & ws.Range(q & 1).Value & "data."
E.Visible = True
wb.Activate()
EL.AddErr(res & " ResOut was called by " & Parent & ". Error Details: " & ex.Message & Chr(10) & Chr(10) & "Inner Exception: " & ex.InnerException.Message _
, epath)
End Try
Try
Rng.Value = OArr
'Save the workbook
wb.SaveAs(SAName)
wb.Close(SaveChanges:=False)
Catch ex As Exception
res = "Encountered an error during the export of the results. Some data may have been exported. Review the contents of the Excel workbook that will " _
& "be visible following this message for more details."
E.Visible = True
wb.Activate()
EL.AddErr(res & " ResOut was called by " & Parent & ". Error Details: " & ex.Message, epath)
End Try
Else
'Close the workbook without saving
wb.Close(SaveChanges:=False)
End If
'Cleanup the application
Try
E.Quit()
System.Runtime.InteropServices.Marshal.ReleaseComObject(E)
E = Nothing
wb = Nothing
ws = Nothing
Rng = Nothing
OArr = Nothing
f = Nothing
x = Nothing
Catch ex As Exception
EL.AddErr("Encountered an error while cleaning up the resources used in JMLib\ResOut. ResOut was called by " & Parent & ". Error Details: " & ex.Message, epath)
End Try
End If
Return res
End Function