Excel No Responding 的解决方案(Slow Addin-减少访问次数)
Excel Add-in的program运行时经常会遇到No responding。 原因可能是low-Addin 引起的。那么问题来了，如何让我们的程序跑的快点呢？
常见优化的三个思考方向：
1. 代码逻辑优化（一般大家的思考逻辑都是差不多的，可能只有大神才能有质的改变）
2. 改变访问Excel的方式（效果显著， OLEDB， EPPLUS， COM等等）
3. 减少访问次数
当项目处于后期时，1和2可能已经固定下来了。 下面讨论如何减少访问次数以及读写分离（类似于数据库的主从分离思想，- -！）
思路来源：点击打开链接
Public Class labReduceAccess
'Desc: Fetch info from ws1,ws2 and ws3. Put the processed data into ws3
'Author: ZhenYang Cheng
'Date: 01/23/2015
'Input:
'Output:
Shared Sub process()
Dim ws_Lab1 As New Microsoft.Office.Interop.Excel.Worksheet
Dim ws_Lab2 As New Microsoft.Office.Interop.Excel.Worksheet
Dim ws_Lab3 As New Microsoft.Office.Interop.Excel.Worksheet
Dim ws_number As Integer
If GlobalDataAndFunction.Instance().IsWorksheetExists(Singleton.Instance().Application, "ws_Lab1") Then
ws_number = GlobalDataAndFunction.Instance().GetWorksheetNo(Singleton.Instance().Application, "ws_Lab1")
ws_Lab1 = Singleton.Instance().Application.Worksheets(ws_number)
End If
If GlobalDataAndFunction.Instance().IsWorksheetExists(Singleton.Instance().Application, "ws_Lab2") Then
ws_number = GlobalDataAndFunction.Instance().GetWorksheetNo(Singleton.Instance().Application, "ws_Lab2")
ws_Lab2 = Singleton.Instance().Application.Worksheets(ws_number)
End If
If GlobalDataAndFunction.Instance().IsWorksheetExists(Singleton.Instance().Application, "ws_Lab3") Then
ws_number = GlobalDataAndFunction.Instance().GetWorksheetNo(Singleton.Instance().Application, "ws_Lab3")
ws_Lab3 = Singleton.Instance().Application.Worksheets(ws_number)
End If
Dim stepLen As Integer = ws_Lab3.UsedRange.Columns.Count + 1
Cursor.Current = Cursors.WaitCursor
GlobalDataAndFunction.Instance.MakeLog("-------------------------Generation Time--------------------------reset time(Unit: ms)")
Dim watch As New Stopwatch
watch.Start()
''''''''''''''''''''''''''''''''''''''''''''Case 1''''''''''''''''''''''''''''''''''''''''''''''
'For i = 1 To ws_Lab3.UsedRange.Rows.Count
' For j = 1 To stepLen - 1
' Dim tmpCell1 As String = CType(ws_Lab1.Cells(i, j).value, String)
' Dim tmpCell2 As String = CType(ws_Lab2.Cells(i, j).Value, String)
' Dim tmpCell3 As String = CType(ws_Lab3.Cells(i, j).value, String)
' Dim tmpResult As String = tmpCell1 + tmpCell2 + tmpCell3
' For m = 0 To 3
' GlobalDataAndFunction.Instance.setCellBackGround(ws_Lab3, i, j + m * stepLen, GlobalDataAndFunction.ColorOrange)
' ws_Lab3.Cells(i, j + m * stepLen).value = tmpResult
' Next
' Next
'Next
'GlobalDataAndFunction.Instance.MakeLog("Case 1-----------" + watch.ElapsedMilliseconds.ToString)
''''''''''''''''''''''''''''''''''''''''''''Case 2 Reduce Access times''''''''''''''''''''''''''''''''''''''''''''
Dim range_Lab1 As Object 'Type is object? Not Excel.range?
Dim range_Lab2 As Object
Dim range_Lab3 As Object
range_Lab1 = ws_Lab1.Range(ws_Lab1.Cells(1, 1), ws_Lab1.Cells(ws_Lab1.UsedRange.Rows.Count, ws_Lab1.UsedRange.Columns.Count)).Value2
range_Lab2 = ws_Lab2.Range(ws_Lab2.Cells(1, 1), ws_Lab2.Cells(ws_Lab2.UsedRange.Rows.Count, ws_Lab2.UsedRange.Columns.Count)).Value2
range_Lab3 = ws_Lab3.Range(ws_Lab3.Cells(1, 1), ws_Lab3.Cells(ws_Lab3.UsedRange.Rows.Count, 500)).Value2
'For i = 1 To 250
' For j = 1 To stepLen - 1
' Dim tmpCell1 As String = CType(range_Lab1(i, j), String)
' Dim tmpCell2 As String = CType(range_Lab2(i, j), String)
' Dim tmpCell3 As String = CType(range_Lab3(i, j), String)
' Dim tmpResult As String = tmpCell1 + tmpCell2 + tmpCell3
' For m = 0 To 3
' GlobalDataAndFunction.Instance.setCellBackGround(ws_Lab3, i, j + m * stepLen, GlobalDataAndFunction.ColorOrange) 'simplest case
' range_Lab3(i, j + m * stepLen) = tmpResult
' Next
' Next
'Next
'ws_Lab3.Range(ws_Lab3.Cells(1, 1), ws_Lab3.Cells(ws_Lab3.UsedRange.Rows.Count, ws_Lab3.UsedRange.Columns.Count)).Value2 = range_Lab3
'GlobalDataAndFunction.Instance.MakeLog("Case 2-----------" + watch.ElapsedMilliseconds.ToString)
'''''''''''''''''''''''''''''''''''''''''Case 3 Range Copy&Paste'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
For i = 1 To 250
For j = 1 To stepLen - 1
Dim tmpCell1 As String = CType(range_Lab1(i, j), String)
Dim tmpCell2 As String = CType(range_Lab2(i, j), String)
Dim tmpCell3 As String = CType(range_Lab3(i, j), String)
Dim tmpResult As String = tmpCell1 + tmpCell2 + tmpCell3
range_Lab3(i, j) = tmpResult
GlobalDataAndFunction.Instance.setCellBackGround(ws_Lab3, i, j, GlobalDataAndFunction.ColorOrange) 'simplest case
Next
Next
ws_Lab3.Range(ws_Lab3.Cells(1, 1), ws_Lab3.Cells(ws_Lab3.UsedRange.Rows.Count, ws_Lab3.UsedRange.Columns.Count)).Value2 = range_Lab3
Dim copyRange As Microsoft.Office.Interop.Excel.Range
copyRange = ws_Lab3.Range(ws_Lab3.Cells(1, 1), ws_Lab3.Cells(ws_Lab3.UsedRange.Rows.Count, ws_Lab3.UsedRange.Columns.Count))
copyRange.Copy()
Dim pasteRange As Microsoft.Office.Interop.Excel.Range
For m = 1 To 3
pasteRange = ws_Lab3.Range(ws_Lab3.Cells(1, m * stepLen), ws_Lab3.Cells(1, m * stepLen))
pasteRange.PasteSpecial()
Next
GlobalDataAndFunction.Instance.MakeLog("Case 3-----------" + watch.ElapsedMilliseconds.ToString)
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
Cursor.Current = Cursors.Default
watch.Stop()
End Sub
End Class这里我做了一个lab， 有三张表ws_Lab1, ws_Lab2, ws_Lab3. 分别存放着 250行100列的信息。 现在的操作是将三张表相同location的cell value叠加，再将结果复制4遍（横向等距）到ws_Lab3里， 并将改变值的cell background设置成orange， 记录时间并打印log。这样做是模拟从多张sheet读写，改变sheet format（最简单format，实际情况可能复杂的多）的耗时操作。
， 三个case
case 1: 按照基本逻辑编写代码, read: 250*100*3 write: 250*100*8(设置Format算一次)
case 2: 空间换时间 read: 3 write: 250*100*4 + 1
case 3: Excel 内部方法range.copy, range.paste read:3 write: 250*100*1 + 1 + 3
