Calculate sum of column sati in listview in C#

Question

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Need to sum last column SATI

What I have tried:

while (rd.Read())
{
    usersNB.Add(new userNB
    {
        //my sql

        Vrijeme = rd.IsDBNull(rd.GetOrdinal("VRIJEME")) ? string.Empty : rd.GetString(rd.GetOrdinal("VRIJEME")),
        Osoba = rd.GetString("OSOBA"),
Sati = rd.IsDBNull(rd.GetOrdinal("SATI")) ? string.Empty : rd.GetInt32(rd.GetOrdinal("SATI")).ToString()



}

Posted 21-Jan-24 21:48pm

Stylus STYLUS

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Maciej Los 22-Jan-24 11:20am

What is rd?

Stylus STYLUS 23-Jan-24 1:31am

Data reader
var rd = cmd.ExecuteReader();

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Pete O'Hanlon · Answer 1 · 2024-01-22T01:29:00

So, you might want to write something like this:

C#

long runningTotal = 0;
while (rd.Read())
{
  string sati = string.Empty;
  if (!rd.IsDBNull(rd.GetOrdinal("SATI"))
  {
    int satiVal = rd.GetInt32(rd.GetOrdinal("SATI"));
    runningTotal += satiVal;
    sati = satiVal.ToString();
  }
  string vrijeme = rd.IsDBNull(rd.GetOrdinal("VRIJEME")) ? string.Empty : rd.GetString(rd.GetOrdinal("VRIJEME"));
  usersNB.Add(new userNB{ Vrijeme = vrijeme, Osoba = rd.GetString("OSOBA"), sati });
}

All you're doing is keeping a running total as you step through the reader. The reason that runningTotal is long rather than int is just to cater for overflowing the maximum or minimum (underflow) value.