datatable 导出 Excel时，怎么操作Excel的表格宽度

StringBuilder strHtml = new StringBuilder();
strHtml.Append("");
strHtml.Append("

");
strHtml.Append("");
strHtml.Append("");
for (int i = 0; i < dgv.Columns.Count; i++)
{
strHtml.Append("");
}
strHtml.Append("");
for (int i = 0; i < dgv.Rows.Count; i++)
{
strHtml.Append("");
for (int j = 0; j < dgv.Columns.Count; j++)
{
string td = "";
strHtml.Append(td);
}
strHtml.Append("");
}
strHtml.Append("

" + m_strTitle + "
" + dgv.Columns[i].HeaderText + "
" + (dgv.Rows[i].Cells[j].Value != null ? dgv.Rows[i].Cells[j].Value.ToString() : "") + "

");
System.IO.File.WriteAllBytes(m_strFilename, System.Text.Encoding.UTF8.GetBytes(strHtml.ToString()));

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修改上面的 td th 等等，定义即可.
dgv 是DataGridView 控件. 都是类似的