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Line meaning

Posted on 2016-08-25
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Last Modified: 2016-08-26
Hi,
What is the meaning of this?
IEnumerable<DocumentFormat.OpenXml.Spreadsheet.Column> ic = cs.Elements<DocumentFormat.OpenXml.Spreadsheet.Column>().Where(r => r.Min == columnIndex).Where(r => r.Max == columnIndex);

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Question by:HuaMinChen
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by:Guy Hengel [angelIII / a3]
Guy Hengel [angelIII / a3] earned 500 total points
ID: 41771242
This is the variable, of the given type, that is getting assigned to the result of the LINQ expression that follows. the reason of the IEnumerable is because of the LINQ returns a collection, with eventually only 1 (or 0 items) in it
IEnumerable<DocumentFormat.OpenXml.Spreadsheet.Column> ic =

this is the collection from where the LINQ will "filter" from ...
cs.Elements<DocumentFormat.OpenXml.Spreadsheet.Column>()

... applying the 2 conditions, saying the processed item (from the above collection) is named r, and making a test on r.<someproperty> == <somevariable>
.Where(r => r.Min == columnIndex)
.Where(r => r.Max == columnIndex);
if the condition on "r" is fulfilled, the object will be returned into the result collection
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by:HuaMinChen
ID: 41771279
Many thanks Hengel.
Is it returning one array per relevant spreadsheet columns, by such line?

What is the purpose to 'care' about only 'First()' below?
                                                    IEnumerable<DocumentFormat.OpenXml.Spreadsheet.Column> ic = cs.Elements<DocumentFormat.OpenXml.Spreadsheet.Column>().Where(r => r.Min == columnIndex).Where(r => r.Max == columnIndex);
                                                    if (ic.Count() > 0)
                                                    {
                                                        DocumentFormat.OpenXml.Spreadsheet.Column c = ic.First();
                                                        double cc = c.Width;
                                                        sw.WriteLine("Cell width: {0}", cc.ToString());
                                                    }

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by:Guy Hengel [angelIII / a3]
ID: 41771294
First() returns what the name is suggesting: the first (and eventually the only) item from the collection.
this avoids to "loop" on the collection.
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by:HuaMinChen
ID: 41771302
To the original line, why does it need to check both Min and Max in there?
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by:Guy Hengel [angelIII / a3]
ID: 41771337
I don't know. that is the application logic presumably
it surely tries to consider only cells that are not merged, and at exaclty that position
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by:HuaMinChen
ID: 41771352
Is such line only destined to check for non-merged cell? How to detect that relevant cell is a merged cell?
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Guy Hengel [angelIII / a3] earned 500 total points
ID: 41771372
Please refer to the documentation, which is really complete on that topic:
DocumentFormat.OpenXml.Spreadsheet.Column

it's not "merged column", in this regards, but a column "info" that only applies to that requested column, ignoring hence any other "info" that would apply to more columns, even if the requested column would be included.

if you wanted to return "all" the colum "info" object that cover the requested column:

.Where(r => r.Min <= columnIndex)
.Where(r => r.Max >= columnIndex);
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by:HuaMinChen
ID: 41771376
Thanks a lot Hengel. Where is the documentation located at?
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Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 41771406
sorry, I had not pasted the URL above:
https://msdn.microsoft.com/en-us/library/documentformat.openxml.spreadsheet.column(v=office.14).aspx

you can find such information really quickly, using google, you search this:
DocumentFormat.OpenXml.Spreadsheet.Column site:microsoft.com
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