DataGridView直接导出EXCEL

 1public void DataToExcel(DataGridView m_DataView)
         {
             SaveFileDialog kk = new SaveFileDialog();
             kk.Title = "保存EXECL文件";
             kk.Filter = "EXECL文件(*.xls) |*.xls |所有文件(*.*) |*.*";
             kk.FilterIndex = ;
             if (kk.ShowDialog() == DialogResult.OK)
             {
                 string FileName = kk.FileName + ".xls";
                if (File.Exists(FileName))
                    File.Delete(FileName);
                FileStream objFileStream;
                StreamWriter objStreamWriter;
                string strLine = "";
                objFileStream = new FileStream(FileName, FileMode.OpenOrCreate, FileAccess.Write);
                objStreamWriter = new StreamWriter(objFileStream, System.Text.Encoding.Unicode);
                for (int i = ; i  < m_DataView.Columns.Count; i++)
                {
                    if (m_DataView.Columns[i].Visible == true)
                    {
                        strLine = strLine + m_DataView.Columns[i].HeaderText.ToString() + Convert.ToChar();
                    }
                }
                objStreamWriter.WriteLine(strLine);
                strLine = ""; 

                for (int i = ; i  < m_DataView.Rows.Count; i++)
                {
                    if (m_DataView.Columns[].Visible == true)
                    {
                        if (m_DataView.Rows[i].Cells[].Value == null)
                            strLine = strLine + " " + Convert.ToChar();
                        else
                            strLine = strLine + m_DataView.Rows[i].Cells[].Value.ToString() + Convert.ToChar();
                    }
                    for (int j = ; j  < m_DataView.Columns.Count; j++)
                    {
                        if (m_DataView.Columns[j].Visible == true)
                        {
                            if (m_DataView.Rows[i].Cells[j].Value == null)
                                strLine = strLine + " " + Convert.ToChar();
                            else
                            {
                                string rowstr = "";
                                rowstr = m_DataView.Rows[i].Cells[j].Value.ToString();
                                if (rowstr.IndexOf("\r\n") >  )
                                    rowstr = rowstr.Replace("\r\n", " ");
                                if (rowstr.IndexOf("\t") >  )
                                    rowstr = rowstr.Replace("\t", " ");
                                strLine = strLine + rowstr + Convert.ToChar();
                            }
                        }
                    }
                    objStreamWriter.WriteLine(strLine);
                    strLine = "";
                }
                objStreamWriter.Close();
                objFileStream.Close();
                MessageBox.Show(this,"保存EXCEL成功","提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
            }
        }

2.用DataGridView绑定的DataTable为参数,导出Excel

 1public void DataToExcel(DataTable m_DataTable)
         {
             SaveFileDialog kk = new SaveFileDialog();
             kk.Title = "保存EXECL文件";
             kk.Filter = "EXECL文件(*.xls) |*.xls |所有文件(*.*) |*.*";
             kk.FilterIndex = ;
             if (kk.ShowDialog() == DialogResult.OK)
             {
                 string FileName = kk.FileName + ".xls";
                if (File.Exists(FileName))
                    File.Delete(FileName);
                FileStream objFileStream;
                StreamWriter objStreamWriter;
                string strLine = "";
                objFileStream = new FileStream(FileName, FileMode.OpenOrCreate, FileAccess.Write);
                objStreamWriter = new StreamWriter(objFileStream, System.Text.Encoding.Unicode);
                for (int i = ; i < m_DataTable.Columns.Count; i++)
                {
                    strLine = strLine + m_DataTable.Columns[i].Caption.ToString() + Convert.ToChar();
                }
                objStreamWriter.WriteLine(strLine);
                strLine = "";

                for (int i = ; i < m_DataTable.Rows.Count; i++)
                {
                    for (int j = ; j < m_DataTable.Columns.Count; j++)
                    {
                        if (m_DataTable.Rows[i].ItemArray[j] == null)
                            strLine = strLine + " " + Convert.ToChar();
                        else
                        {
                            string rowstr = "";
                            rowstr = m_DataTable.Rows[i].ItemArray[j].ToString();
                            if (rowstr.IndexOf("\r\n") > )
                                rowstr = rowstr.Replace("\r\n", " ");
                            if (rowstr.IndexOf("\t") > )
                                rowstr = rowstr.Replace("\t", " ");
                            strLine = strLine + rowstr + Convert.ToChar();
                        }
                    }
                    objStreamWriter.WriteLine(strLine);
                    strLine = "";
                }
                objStreamWriter.Close();
                objFileStream.Close();
                MessageBox.Show(this, "保存EXCEL成功", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
        }