大数据导出Excel

本文介绍: if (scount * pageRows < table.Rows.Count)//当总行数不被pageRows整除时，经过四舍五入可能页数不准。//取得sheet1。

1、针对大数据导出到excel，动态生成datatable数据集

DataTable dt = new DataTable();
dt.Columns.Add(“Name”, typeof(string));
dt.Columns.Add(“Age”, typeof(string));
for (int i = 0; i < 10000; i++)
{
DataRow dr = dt.NewRow();
dr[“Name”] = “spring” + i.ToString();
dr[“Age”] = “2” + i.ToString();
dt.Rows.Add(dr);
}
dt.AcceptChanges();

2、根据数据集内容导出到excel

public static bool ExportToExcel(System.Data.DataTable table, string saveFileName)
{

bool fileSaved = false;

//ExcelApp xlApp = new ExcelApp();

Application xlApp = new Application();

if (xlApp == null)
{
return fileSaved;
}

Workbooks workbooks = xlApp.Workbooks;
Workbook workbook = workbooks.Add(XlWBATemplate.xlWBATWorksheet);
Worksheet worksheet = (Worksheet)workbook.Worksheets[1];//取得sheet1

long rows = table.Rows.Count;

/*下边注释的两行代码当数据行数超过行时，出现异常：异常来自HRESULT:0x800A03EC。因为：Excel 2003每个sheet只支持最大行数据

//Range fchR = worksheet.Range[worksheet.Cells[1, 1], worksheet.Cells[table.Rows.Count+2, gridview.Columns.View.VisibleColumns.Count+1]];

//fchR.Value2 = datas;*/

if (rows > 65535)
{

long pageRows = 60000;//定义每页显示的行数,行数必须小于60000

int scount = (int)(rows / pageRows);

if (scount * pageRows < table.Rows.Count)//当总行数不被pageRows整除时，经过四舍五入可能页数不准
{
scount = scount + 1;
}

for (int sc = 1; sc <= scount; sc++)
{
if (sc > 1)
{

object missing = System.Reflection.Missing.Value;

worksheet = workbook.Worksheets.Add(

missing, missing, missing, missing);//添加一个sheet

}

else
{
worksheet = (Worksheet)workbook.Worksheets[sc];//取得sheet1
}

string[,] datas = new string[pageRows + 1, table.Columns.Count + 1];

for (int i = 0; i < table.Columns.Count; i++) //写入字段
{
datas[0, i] = table.Columns[i].Caption;
}

Range range = worksheet.Range[worksheet.Cells[1, 1], worksheet.Cells[1, table.Columns.Count]];
range.Interior.ColorIndex = 15;//15代表灰色
range.Font.Bold = true;
range.Font.Size = 9;

int init = int.Parse(((sc – 1) * pageRows).ToString());
int r = 0;
int index = 0;
int result;

if (pageRows * sc >= table.Rows.Count)
{
result = table.Rows.Count;
}
else
{
result = int.Parse((pageRows * sc).ToString());
}
for (r = init; r < result; r++)
{
index = index + 1;
for (int i = 0; i < table.Columns.Count; i++)
{
if (table.Columns[i].DataType == typeof(string) || table.Columns[i].DataType == typeof(Decimal) || table.Columns[i].DataType == typeof(DateTime))
{
object obj = table.Rows[r][table.Columns[i].ColumnName];
datas[index, i] = obj == null ? “” : “‘” + obj.ToString().Trim();//在obj.ToString()前加单引号是为了防止自动转化格式

}

}
}

Range fchR = worksheet.Range[worksheet.Cells[1, 1], worksheet.Cells[index + 2, table.Columns.Count + 1]];

fchR.Value2 = datas;
worksheet.Columns.EntireColumn.AutoFit();//列宽自适应。

range = worksheet.Range[worksheet.Cells[1, 1], worksheet.Cells[index + 1, table.Columns.Count]];

//15代表灰色

range.Font.Size = 9;
range.RowHeight = 14.25;
range.Borders.LineStyle = 1;
range.HorizontalAlignment = 1;

}

else
{

string[,] datas = new string[table.Rows.Count + 2, table.Columns.Count + 1];
for (int i = 0; i < table.Columns.Count; i++) //写入字段
{
datas[0, i] = table.Columns[i].Caption;
}

Range range = worksheet.Range[worksheet.Cells[1, 1], worksheet.Cells[1, table.Columns.Count]];
range.Interior.ColorIndex = 15;//15代表灰色
range.Font.Bold = true;
range.Font.Size = 9;

int r = 0;
for (r = 0; r < table.Rows.Count; r++)
{
for (int i = 0; i < table.Columns.Count; i++)
{
if (table.Columns[i].DataType == typeof(string) || table.Columns[i].DataType == typeof(Decimal) || table.Columns[i].DataType == typeof(DateTime))
{
object obj = table.Rows[r][table.Columns[i].ColumnName];
datas[r + 1, i] = obj == null ? “” : “‘” + obj.ToString().Trim();//在obj.ToString()前加单引号是为了防止自动转化格式

}

//System.Windows.Forms.Application.DoEvents();

}

Range fchR = worksheet.Range[worksheet.Cells[1, 1], worksheet.Cells[table.Rows.Count + 2, table.Columns.Count + 1]];

fchR.Value2 = datas;

worksheet.Columns.EntireColumn.AutoFit();//列宽自适应。

range = worksheet.Range[worksheet.Cells[1, 1], worksheet.Cells[table.Rows.Count + 1, table.Columns.Count]];

//15代表灰色

range.Font.Size = 9;
range.RowHeight = 14.25;
range.Borders.LineStyle = 1;
range.HorizontalAlignment = 1;
}

if (saveFileName != “”)
{
try
{
workbook.Saved = true;
workbook.SaveCopyAs(saveFileName);
fileSaved = true;

}

catch (Exception ex)
{
fileSaved = false;
}