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MSExcel.Application appExcel;
MSExcel.Workbook excelDoc;
appExcel = new MSExcel.Application();
Object Nothing = Missing.Value;
excelDoc = appExcel.Workbooks.Add(Nothing);
object format = MSExcel.XlFileFormat.xlWorkbookNormal;
MSExcel.Worksheet ws = (MSExcel.Worksheet)excelDoc.Sheets[1];
//创建表头
ws.Cells[1, 1] = "重复出现的词";
ws.Cells[1, 2] = "重复次数";
//写入数据
for (int i = 1; i < dt.Rows.Count; i++)
{
ws.Cells[i+1, 1] = dt.Rows[i][0].ToString();
ws.Cells[i+1, 2] = dt.Rows[i][1].ToString();
}