How to use the Compute to calculate the total

Question

5.00/5 (2 votes)

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My table has:IDProduct,ProductName,Quantity,price,total
total=price*Quantity
I want to sum the total column
Ex:
total[0]=price*Quantity (first row)
total[1]=price*Quantity (second row)
total[2]=price*Quantity
.....
I want to get:total=total[0]+total[1]+total[2]+..+total[n]
I don't want to use for/foreach loop
I can:

C#

float TotalOrder = float.Parse(dt.Compute("sum(total)",string.Empty).ToString());

Can someone help me?

Posted 11-Jun-12 22:40pm

giatuan2011

Updated 11-Jun-12 22:49pm

Richard MacCutchan

v2

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Comments

RDBurmon 13-Jun-12 9:35am

Thanks Everyone who replied to this thread , So giatuan, I think you have got enough responses and you should be able to mark it as your answer and close the thread. Please do so.

3 solutions

Solution 3

1. Why don't you just use Linq?

C#

float total = (float) dt.AsEnumerable().Sum(r=>r.total);

2. try with capital S in sum.

C#

dt.Compute("Sum(total)",string.Empty)

3. I'll put my smart-ass goggles and say that You should refactor your code...
(what if Compute returns null? why parsing approach?)

Posted 11-Jun-12 23:24pm

Oshtri Deka

Solution 4

Try this

public object SumTotPremium;

C#

//Calculation below 
SumTotPremium = datatable.Compute("Sum(Columname)", "");
//Show into Label
lblshowTotPremium.Text = 
String.Format("{0:INR #,##0.00}",Convert.ToDecimal(SumTotPremium));

Posted 11-Jun-12 23:55pm

Michael_Jacsi

Updated 11-Jun-12 23:57pm

v2

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VJ Reddy · Accepted Answer · 2012-06-11T23:13:00

There are two options.

Option1

The Expression property of DataColumn explained here http://msdn.microsoft.com/en-us/library/system.data.datacolumn.expression(v=vs.90).aspx[^] can be used to establish the relation of Total = Quantity * Price for the Total column as shown below, in which case the Total field will be a read only field.

C#

DataTable products = new DataTable("Products");
products.Columns.Add("IdProduct",typeof(int),null);
products.Columns.Add("Quantity",typeof(double),null);
products.Columns.Add("Price",typeof(double),null);
products.Columns.Add("Total",typeof(double),"Price * Quantity");

products.Rows.Add(1, 5, 25.5);
products.Rows.Add(2,10,37.7);


float TotalOrder = float.Parse(products.Compute("sum(Total)",string.Empty).ToString());
Console.WriteLine (TotalOrder);
/* Output
Contents of products Table
Id Quantity Price Total 
1    5   25.5   127.5 
2   10   37.7   377 
3   15   63.2   504.5 

TotalOrder =
504.5
*/

Option 2

LINQ can be used as follows to calculate Total for each Row

C#

DataTable products = new DataTable("Products");
products.Columns.Add("IdProduct",typeof(int),null);
products.Columns.Add("Quantity",typeof(double),null);
products.Columns.Add("Price",typeof(double),null);
products.Columns.Add("Total",typeof(double),null); 

products.Rows.Add(1, 5, 25.5);
products.Rows.Add(2,10,37.7);

//Count extension method is used to force immediate execution of the query
//as the LINQ query has deferred execution model and gets executed
//when it is iterated or a scalar function like Count is called.
products.AsEnumerable().Select ( p => { p.SetField<double>("Total",
     p.Field<double>("Quantity") * p.Field<double>("Price"));
     return p;
}).Count ();

float TotalOrder = float.Parse(products.Compute("sum(Total)",string.Empty).ToString());
Console.WriteLine (TotalOrder);
//Output will be same as shown above.