[英]Find starting row number and last row number in excel based on a value using epplus
我正在使用EPPLUS将查询结果放入excel。 我有一列称为category,我需要在每个类别之后插入一个新行以包括小计。
我的Excel看起来像这样
Category | Quantity
A | 5
A | 10
A | 3
B | 2
B | 3
C | 2
唯一正确的是我们始终从A2开始。 类别A开始于A2,结束于A4,但假设我们不知道,我如何获取A的最后一行,以便可以在其后插入一行,然后插入类别B,依此类推。
预期成绩:
Category | Quantity
A | 5
A | 10
A | 3
Total | 18
B | 2
B | 3
Total | 5
C | 2
Total | 2
根据要求查询放置数据:
sqlcmd = new sqlcommand(query, con);
sqlreader = sqlcmd.executereader();
while (sqlreader.read())
{
ws.Cells[rownum, 1].Value = sqlreader["Category"];
ws.Cells[rownum, 2].Value = sqlreader["Quantity"];
rownum = rownum + 1;
}
新代码:
string currentcategory = "";
string newcategory = "";
while (sqlreader.read())
{
if (currentcategory == "")
{
currentcategory= global_dr["category"].ToString();
newcategory= global_dr["category"].ToString();
}
else
{
newcategory= global_dr["category"].ToString();
}
if (newcategory == currentcategory)
{
ws.Cells[rownum, 1].Value = sqlreader["category"];
ws.Cells[rownum, 2].Value = sqlreader["Quantity"];
rownum = rownum + 1;
}
else
{
rownum = rownum + 1;
ws.Cells[rownum, 1].Value = sqlreader["category"];
ws.Cells[rownum, 2].Value = sqlreader["Quantity"];
rownum = rownum + 1;
currentcategory = "";
}
}
上面的代码用于为小计添加一些空行,但有一些错误,这是示例输出
Category | Quantity
A | 5
A | 10
A | 3
B | 2
B | 3
C | 2
D | 1
预期:
C | 2
D | 1
如果类别只有1行,则我当前的代码有错误。
更多编辑:在我填充数据后,通过添加行来解决上述问题。
int rowstart = 1;
while (ws.Cells[rowstart, 1].Value.ToString() != "")
{
if (ws.Cells[rowstart, 1].Value.ToString() != ws.Cells[rowstart + 1, 1].Value.ToString())
{
ws.InsertRow(rowstart + 1, 1);
rowstart = rowstart + 2;
}
else
{
rowstart = rowstart + 1;
}
}
新问题:到达终点后,例如最后一行中的文本为10,我将获得Object reference not set to an instance of an object
为第11行Object reference not set to an instance of an object
以下是一个简单的示例,可以帮助您了解如何获得A的最后一行。
static void Main(string[] args)
{
ExcelPackage ep = new ExcelPackage(new FileInfo(@"d:\temp\EPTest.xlsx"));
ExcelWorksheet ws = ep.Workbook.Worksheets.First();
//Get all the cells with text "A" in column "A"
var acells = from cell in ws.Cells["A:A"] where cell.Text.Equals("A") select cell;
//To insert row after the last identified "A" increment the row number by 1
ws.InsertRow(acells.Last().End.Row + 1,1);
ep.Save();
}
要进一步了解并获取示例,请访问epplus.codeplex.com
像这样-您可能需要做一些调试,因为我对C#完全不了解。
const long ROW_START = 2;
var sqlcmd = new SqlCommand(query, con);
var sqlreader = sqlcmd.ExecuteReader();
string c;
double q;
string curr_c = "~~~~~~~~~";
double tot = 0;
long r = 0;
long rownum = ROW_START;
while (sqlreader.Read())
{
q = (double)sqlreader["Quantity"];
c = sqlreader["Category"].ToString();
if (c != curr_c)
{
if (rownum > ROW_START)
{
ws.Cells[rownum, 1].Value = "Total";
ws.Cells[rownum, 2].Value = tot;
rownum += 1;
}
curr_c = c;
tot = 0;
}
ws.Cells[rownum, 1].Value = c;
ws.Cells[rownum, 2].Value = q;
tot += q;
rownum += 1;
}
ws.Cells[rownum, 1].Value = "Total";
ws.Cells[rownum, 2].Value = tot;
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