How to get "count" and "SUM" in datatable C#

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In my application I have a datatable named TB which contains the following columns: BL, PREP, NBLIG, QTY and ERRTYPE. here is an example of data from the table

BL		PREP	NBLIG	QTY		ERRTYPE
125485	P1		5		125		RNF
189654	P2		12		762		RNF
156985	P2		3		36		FNR
219874	P1		36		5423	OTH
123698	P3		6		112		OTH
719736	P1		25		998		RNF

I want, for each PREP, to calculate the number of BL the sum of NBLIG and QTY and the number of each ERRTYPE. Then put this data in a datagridview as following:

PREP	NB_BL	TOTLIG	TOTQTY	TOTRNF	TOTFNR	TOTOTH      
P1		3		66		6546	2		0		1
P2		2		15		798		1		1		0
P3		1		6		112		0		0		1

What I have tried:

Can you help me to find the right method to use in my code?

i'm new in using datatable

thanks

Posted 7-Jun-18 22:17pm

User 13831921

Updated 11-Jun-18 2:54am

Maciej Los

v2

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4 solutions

Solution 1

~~If this is in a database then you should be able to use SQL COUNT(), AVG() and SUM() Functions[^]~~

See DataTable Class (System.Data)[^].

Posted 7-Jun-18 22:31pm

Richard MacCutchan

Updated 8-Jun-18 2:39am

v2

Comments

[no name] 8-Jun-18 8:14am

No it's not in database

Richard MacCutchan 8-Jun-18 8:34am

Then you will have to write the code to find all the related items in your table and count them and calculate the totals.

Solution 2

You can use DataTable.Compute method.

Check this link for more information. DataTable.Compute Method (String, String) (System.Data)[^]

Posted 10-Jun-18 21:48pm

Rocky Villalobos Bitos Jr.

Updated 10-Jun-18 21:49pm

v2

Solution 4

This could be achieved in multiple ways. However, if you want to save your time, I would recommend the use of time-saving LINQ queries.

Here is the function that I have created for you :

public static DataTable BuildPrepData(DataTable sourceData)
        {
            try
            {
                DataTable outTable = new DataTable("PrepData");
                DataColumn[] dataColumn = {
                    new DataColumn("PREP", typeof(string)),
                    new DataColumn("NB_BL", typeof(int)),
                    new DataColumn("TOTLIG", typeof(int)),
                    new DataColumn("TOTQTY", typeof(int)),
                    new DataColumn("TOTRNF", typeof(int)),
                    new DataColumn("TOTFNR", typeof(int)),
                    new DataColumn("TOTOTH", typeof(int))
                };
                outTable.Columns.AddRange(dataColumn);

                var output = sourceData.AsEnumerable()
                    .GroupBy(Prep => Prep.Field<string>("PREP"))
                    .Select(PrepGroup => new
                    {
                        PREP = PrepGroup.Key,
                        NB_BL = PrepGroup.Count(),
                        TOTLIG = PrepGroup.Where(x => x.Field<string>("PREP") == PrepGroup.Key).Sum(x => x.Field<int>("NBLIG")),
                        TOTQTY = PrepGroup.Where(x => x.Field<string>("PREP") == PrepGroup.Key).Sum(x => x.Field<int>("QTY")),
                        TOTRNF = PrepGroup.Where(x => x.Field<string>("ERRTYPE") == "RNF").Count(),
                        TOTFNR = PrepGroup.Where(x => x.Field<string>("ERRTYPE") == "FNR").Count(),
                        TOTOTH = PrepGroup.Where(x => x.Field<string>("ERRTYPE") == "OTH").Count()
                    }).ToList();

                foreach (var dRow in output)
                {
                    DataRow row = outTable.NewRow();
                    row["PREP"] = dRow.PREP;
                    row["NB_BL"] = dRow.NB_BL;
                    row["TOTLIG"] = dRow.TOTLIG;
                    row["TOTQTY"] = dRow.TOTQTY;
                    row["TOTRNF"] = dRow.TOTRNF;
                    row["TOTFNR"] = dRow.TOTFNR;
                    row["TOTOTH"] = dRow.TOTOTH;
                    outTable.Rows.Add(row);
                }

                return outTable;
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                return null;
            }
        }

All you need to do here is to utilize this function and provide it with an object of datatable in the format you explained in your question.

BL		PREP	NBLIG	QTY		ERRTYPE
125485	P1		5		125		RNF
189654	P2		12		762		RNF
156985	P2		3		36		FNR
219874	P1		36		5423	OTH
123698	P3		6		112		OTH
719736	P1		25		998		RNF

Please ignore static and console.writeline() as I have just tried to do this using standard console application.

Hope this helps!

Posted 11-Jun-18 2:56am

Nachiket G

Comments

Maciej Los 11-Jun-18 9:21am

What your answer differs from mine?
I'd say your linq query is exactly the same as mine! That's why i voted 1.

Nachiket G 11-Jun-18 9:43am

Yeah, when I started writing my aswer I found myself ending up with almost the same solution. I though why not use good work already done by you. So helped in creating a separate function. I am also voting you the same now. :)

Maciej Los 11-Jun-18 15:56pm

No comments...

Richard Deeming 12-Jun-18 12:04pm

Taking somebody else's work and presenting it as your own is known as plagiarism.

We take a very dim view of that here.

Nachiket G 14-Jun-18 6:00am

Come on guys! Could you not read the part on above comment where I have mentioned of "ending up with almost the same solution"! Yeah I agree that I am suggesting alomost same solution, but if I had to copy I would have used it as is. If you are an experienced professional, in the world of coding two or more people may have same way of thinking and/or writing the code. I would do Nothing but ignore further comments on this issue.

[no name] 11-Jun-18 9:28am

Thank you !

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Maciej Los · Accepted Answer · 2018-06-10T22:32:00

It's quite simple. All what you need to do is to group data by PREP field. Please, check out below solution:

DataTable dt = new DataTable();
dt.Columns.AddRange(new DataColumn[]
	{
		new DataColumn("BL", typeof(int)),
		new DataColumn("PREP", typeof(string)),
		new DataColumn("NBLIG", typeof(int)),
		new DataColumn("QTY", typeof(int)),
		new DataColumn("ERRTYPE", typeof(string))
	});
dt.Rows.Add(new object[]{125485, "P1", 5, 125, "RNF"});
dt.Rows.Add(new object[]{189654, "P2", 12, 762, "RNF"});
dt.Rows.Add(new object[]{156985, "P2", 3, 36, "FNR"});
dt.Rows.Add(new object[]{219874, "P1", 36, 5423, "OTH"});
dt.Rows.Add(new object[]{123698, "P3", 6, 112, "OTH"});
dt.Rows.Add(new object[]{719736, "P1", 25, 998, "RNF"});

var result = dt.AsEnumerable()
	.GroupBy(x=>x.Field<string>("PREP"))
	.Select(grp=>new
	{
		PREP = grp.Key,
		NB_BL = grp.Count(),
		TOTLIG = grp.Where(x=>x.Field<string>("PREP")==grp.Key).Sum(x=>x.Field<int>("NBLIG")),
		TOTQTY = grp.Where(x=>x.Field<string>("PREP")==grp.Key).Sum(x=>x.Field<int>("QTY")),
		TOTRNF = grp.Where(x=>x.Field<string>("ERRTYPE")=="RNF").Count(),
		TOTFNR = grp.Where(x=>x.Field<string>("ERRTYPE")=="FNR").Count(),
		TOTOTH = grp.Where(x=>x.Field<string>("ERRTYPE")=="OTH").Count()
	})
	.ToList();