我使用以下代码下载 Excel 工作表。
上面的代码是我的逻辑的起始代码。下载后，我打开 Excel 表。它显示这样的警告
由于这个警告，当我尝试使用 Asp.Net 将同一页面上传到 Mysql 数据库时，它会显示一个异常，如“页面格式不正确”。
这是我下载 Excel 工作表的全部逻辑
protected void download_Click(object sender, EventArgs e)
{
ExportToExcel(SqlDataSource1, "StudentMarks");
}
public void ExportToExcel(SqlDataSource dataSrc, string fileName)
{
//Add Response header
Response.Clear();
Response.AddHeader("content-disposition", string.Format("attachment;filename={0}.xls", fileName));
Response.Charset = "";
Response.ContentType = "application/ms-excel";
//GET Data From Database
MySqlConnection cn = new MySqlConnection(dataSrc.ConnectionString);
// string query = dataSrc.SelectCommand.Replace("\r\n", " ").Replace("\t", " ");
MySqlCommand cmd9 = new MySqlCommand("select subject from class_subject where standard='" + DropDownList1.SelectedItem.Value + "';", cn);
// cn.Open();
//DataSet ds9=new DataSet();
MySqlDataAdapter da9 = new MySqlDataAdapter(cmd9);
// da9.Fill(ds9);
DataTable dt = new DataTable();
da9.Fill(dt);
StringBuilder sb9 = new StringBuilder();
for (int count = 0; count < dt.Rows.Count; count++)
{
// string headerRowText = GridView4.HeaderRow.Cells[i].Text;
sb9.Append("'");
sb9.Append(dt.Rows[count][0].ToString());
sb9.Append("'");
if (count < dt.Rows.Count - 1)
//if (count < count3 - 1)
{
sb9.Append(",");
}
}
Label2.Text = sb9.ToString();
//MySqlCommand fyearcmd = new MySqlCommand("select fyear from student_data where standard='" + DropDownList1.SelectedItem.Value + "' and completed_status='running';", cn);
//MySqlDataReader fyeardr = fyearcmd.ExecuteReader();
string query = "select Admission_Num,Name,'Standard','Fyear','Type_of_exam'," + sb9.ToString() + " from student_data where standard='" + DropDownList1.SelectedItem.Value + "' and fyear='" + DropDownList4.SelectedItem.Value + "';";
MySqlCommand cmd = new MySqlCommand(query, cn);
cmd.CommandTimeout = 999999;
cmd.CommandType = CommandType.Text;
try
{
cn.Open();
MySqlDataReader dr = cmd.ExecuteReader();
StringBuilder sb = new StringBuilder();
//Session["fieldcount"] = dr.FieldCount.ToString();
//Label1.Text = dr.FieldCount.ToString();
//Add Header
int count3 = 4;
for (int count = 0; count < dr.FieldCount; count++)
//for (int count = 0; count < count3; count++)
{
if (dr.GetName(count) != null)
sb.Append(dr.GetName(count));
if (count < dr.FieldCount - 1)
//if (count < count3 - 1)
{
sb.Append("\t");
}
}
Response.Write(sb.ToString() + "\n");
Response.Flush();
//Append Data
while (dr.Read())
{
sb = new StringBuilder();
//for (int col = 0; col < dr.FieldCount - 1; col++)
for (int col = 0; col <= count3; col++)
{
if (col < (count3 - 2))
{
if (!dr.IsDBNull(col))
sb.Append(dr.GetValue(col).ToString().Replace(",", " "));
sb.Append("\t");
}
if (col == (count3 - 2))
{
if (!dr.IsDBNull(col))
sb.Append(DropDownList1.SelectedItem.Text);
sb.Append("\t");
}
if (col == (count3 - 1))
{
if (!dr.IsDBNull(col))
{
//sb.Append(dr.GetValue(col).ToString().Replace(",", " "));
sb.Append(DropDownList4.SelectedItem.Text);
}
sb.Append("\t");
}
if (col == count3)
{
if (!dr.IsDBNull(col))
{
//sb.Append(dr.GetValue(col).ToString().Replace(",", " "));
sb.Append(DropDownList3.SelectedItem.Text);
}
sb.Append("\t");
}
}
//if (!dr.IsDBNull(dr.FieldCount - 1))
// sb.Append(dr.GetValue(dr.FieldCount - 1).ToString().Replace(",", " "));
Response.Write(sb.ToString() + "\n");
Response.Flush();
}
dr.Dispose();
}
catch (Exception ex)
{
Response.Write(ex.Message);
}
finally
{
cmd.Connection.Close();
cn.Close();
}
Response.End();
}
所以请给我建议如何在打开时不显示错误的情况下下载 Excel 表。