问题补充：
如上
答案：
用数据流. 先将数据绑定到dataview.然后如下.
注:dgvAgeWeekSex==dataview的name
private void SaveAs() //另存新档按钮 导出成Excel
{
SaveFileDialog saveFileDialog = new SaveFileDialog();
saveFileDialog.Filter = "Execl files (*.xls)|*.xls";
saveFileDialog.FilterIndex = 0;
saveFileDialog.RestoreDirectory = true;
saveFileDialog.CreatePrompt = true;
saveFileDialog.Title = "Export Excel File To";
saveFileDialog.ShowDialog();
Stream myStream;
myStream = saveFileDialog.OpenFile();
StreamWriter sw = new StreamWriter(myStream, System.Text.Encoding.GetEncoding(-0));
string str = "";
try{ //写标题
for (int i = 0; i < dgvAgeWeekSex.ColumnCount; i )
{
if (i > 0)
{
str = "\t";}str = dgvAgeWeekSex.Columns[i].HeaderText;
}
sw.WriteLine(str);
//写内容
for (int j = 0; j < dgvAgeWeekSex.Rows.Count; j ){string tempStr = "";<br/>for (int k = 0; k < dgvAgeWeekSex.Columns.Count; k )<br/>{<br/>if (k > 0){tempStr = "\t";}tempStr = dgvAgeWeekSex.Rows[j].Cells[k].Value.ToString();
}
sw.WriteLine(tempStr);
}
sw.Close();
myStream.Close();
}
catch (Exception e)
{MessageBox.Show(e.ToString());<br/>}
finally{
sw.Close(); myStream.Close();
}
}
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