快速导入Excel到数据表 [英] Importing Excel into a DataTable Quickly
本文介绍了快速导入Excel到数据表的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在尝试将Excel文件读入Data.DataTable的列表,尽管使用我当前的方法可能需要很长时间。我通过工作表,按单元格精通工作表,并且往往需要很长时间。有更快的方法吗?这是我的代码:
I am trying to read an Excel file into a list of Data.DataTable, although with my current method it can take a very long time. I essentually go Worksheet by Worksheet, cell by cell, and it tends to take a very long time. Is there a quicker way of doing this? Here is my code:
List<DataTable> List = new List<DataTable>();
// Counting sheets
for (int count = 1; count < WB.Worksheets.Count; ++count)
{
// Create a new DataTable for every Worksheet
DATA.DataTable DT = new DataTable();
WS = (EXCEL.Worksheet)WB.Worksheets.get_Item(count);
textBox1.Text = count.ToString();
// Get range of the worksheet
Range = WS.UsedRange;
// Create new Column in DataTable
for (cCnt = 1; cCnt <= Range.Columns.Count; cCnt++)
{
textBox3.Text = cCnt.ToString();
Column = new DataColumn();
Column.DataType = System.Type.GetType("System.String");
Column.ColumnName = cCnt.ToString();
DT.Columns.Add(Column);
// Create row for Data Table
for (rCnt = 0; rCnt <= Range.Rows.Count; rCnt++)
{
textBox2.Text = rCnt.ToString();
try
{
cellVal = (string)(Range.Cells[rCnt, cCnt] as EXCEL.Range).Value2;
}
catch (Microsoft.CSharp.RuntimeBinder.RuntimeBinderException)
{
ConvertVal = (double)(Range.Cells[rCnt, cCnt] as EXCEL.Range).Value2;
cellVal = ConvertVal.ToString();
}
// Add to the DataTable
if (cCnt == 1)
{
Row = DT.NewRow();
Row[cCnt.ToString()] = cellVal;
DT.Rows.Add(Row);
}
else
{
Row = DT.Rows[rCnt];
Row[cCnt.ToString()] = cellVal;
}
}
}
// Add DT to the list. Then go to the next sheet in the Excel Workbook
List.Add(DT);
}
推荐答案
加油 .Value2
是一个昂贵的操作,因为它是一个COM互操作调用。我会将整个范围读入数组,然后循环遍历数组:
Caling .Value2
is an expensive operation because it's a COM-interop call. I would instead read the entire range into an array and then loop through the array:
object[,] data = Range.Value2;
// Create new Column in DataTable
for (int cCnt = 1; cCnt <= Range.Columns.Count; cCnt++)
{
textBox3.Text = cCnt.ToString();
var Column = new DataColumn();
Column.DataType = System.Type.GetType("System.String");
Column.ColumnName = cCnt.ToString();
DT.Columns.Add(Column);
// Create row for Data Table
for (int rCnt = 0; rCnt <= Range.Rows.Count; rCnt++)
{
textBox2.Text = rCnt.ToString();
string CellVal = String.Empty;
try
{
cellVal = (string)(data[rCnt, cCnt]);
}
catch (Microsoft.CSharp.RuntimeBinder.RuntimeBinderException)
{
ConvertVal = (double)(data[rCnt, cCnt]);
cellVal = ConvertVal.ToString();
}
DataRow Row;
// Add to the DataTable
if (cCnt == 1)
{
Row = DT.NewRow();
Row[cCnt.ToString()] = cellVal;
DT.Rows.Add(Row);
}
else
{
Row = DT.Rows[rCnt];
Row[cCnt.ToString()] = cellVal;
}
}
}
这篇关于快速导入Excel到数据表的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文