C# 计算listview中sati列的总和

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Need to sum last column SATI

我尝试过的：

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()



}

解决方案1

所以，你可能想写这样的东西：

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 });
}

您所做的就是在浏览阅读器时保持运行总计。 runningTotal 是 long 而不是 int 的原因只是为了满足最大或最小（下溢）值的溢出。

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