Thanks for posting the C# code. Your comment that this is slower than VBA is
interesting, I had always been under the impression that VBA is slower.

I tested "For 1 to .UsedRange.Count" vs "For Each" with data in 1500 merged
areas in a UR of 10,000 cells. Both slow but virtually same time. So I don't
think the VBA vs C# speed difference is related to "For Each".

However I found this about twice as fast:

Sub TestUnmerge3()
Dim i As Long, n As Long
ReDim ay(1, 0)

With ActiveSheet.UsedRange
For i = 1 To .Count
If .Cells(i).MergeArea.Count 1 Then
If .Cells(i) < "" Then ' And .Cells(i).HasFormula = False '?
n = n + 1
ReDim Preserve ay(1, n)
ay(0, n) = .Cells(i).MergeArea.Address
ay(1, n) = .Cells(i).Value
End If
End If
Next
..UnMerge
End With
For i = 1 To n
Range(ay(0, i)).Value = ay(1, i)
Next
End Sub

Even with all the array stuff, taking '.UnMerge' [each single mergearea] out
of the loop seems to give a dramatic speed improvement.

Regards,
Peter

"Tomorrow" wrote in message
...
Dear Peter:
Because Range is a class in C#, so I can't use the Foreach statement
as
in VBA code.
Finally, I use a replacement method to do the same thing. Though it is
lower than your method.
The C# code as below:

for (int i=1; i<=Int32.Parse(ws.UsedRange.Rows.Count.ToString()) ;i++)
{
for (int j=1; j<=Int32.Parse(ws.UsedRange.Columns.Count.ToString ()); j++)
{
Excel.Range Range =(Excel.Range) ws.UsedRange[i,j];
if (bool.Parse(Range.MergeCells.ToString()))
{
Excel.Range rMergeArea = (Excel.Range) Range.MergeArea;
Range.MergeArea.UnMerge();
rMergeArea.Value2 =
Range.Value2;
}
}
}

In a word, thank you very very much for your reply and guide for me.
And I'm very pleasure to make a friend with you. My mail is
.

Best Regards,
Tomorrow


"Peter T" wrote:

Glad it works, in VBA at least.

When you have it working in C#, could you post the code - I will learn
something!

Typo in my previous comments:
- Unmerge B2:B5 and put "X" in the other 7 cells
should of course read
...in the other 3 cells

Regards,
Peter

"Tomorrow" wrote in message
...
Sorry, I had tried your code. It's ok.
May be C# code must have some difference on it.
I'll go on trying it.

thanks!

"Tomorrow" wrote:

Thaks, Peter:
Yeah, I want function just like that you said below. I had tried
the
method you teached, but it can't work. The error means that can't
find
the
Range obeject with which use the foreach sentence. Did you work ok?

Regards,
Tomorrow


"Peter T" wrote:

I might have misunderstood your original question, are you saying
you
want
to do something like this:

- First merged area is (say) B2:B5 and B2 contains value "X" (only
B2
can
contain data)
- Unmerge B2:B5 and put "X" in the other 7 cells.
- Do similar with all merged areas on the sheet

Sub TestUnmerge()
Dim r As Range, rMgArea As Range

For Each r In ActiveSheet.UsedRange
If r.MergeArea.Cells.Count 1 Then
Set rMgArea = r.MergeArea
r.UnMerge
rMgArea.Value = r.Value
End If
Next

End Sub

This assumes by "value" you mean constants and not formulas. If
not
above
would need to be changed.

Regards,
Peter
snip<