1.直接将DataGridView显示的内容导出Excel  

public 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 = 1;            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 = 0; i < m_DataView.Columns.Count; i++)                {                    if (m_DataView.Columns[i].Visible == true)                    {                        strLine = strLine + m_DataView.Columns[i].HeaderText.ToString() + Convert.ToChar(9);                    }                }                objStreamWriter.WriteLine(strLine);                strLine = "";                for (int i = 0; i < m_DataView.Rows.Count; i++)                {                    if (m_DataView.Columns[0].Visible == true)                    {                        if (m_DataView.Rows[i].Cells[0].Value =http://www.mamicode.com/= null)                            strLine = strLine + " " + Convert.ToChar(9);                        else                            strLine = strLine + m_DataView.Rows[i].Cells[0].Value.ToString() + Convert.ToChar(9);                    }                    for (int j = 1; j < m_DataView.Columns.Count; j++)                    {                        if (m_DataView.Columns[j].Visible == true)                        {                            if (m_DataView.Rows[i].Cells[j].Value =http://www.mamicode.com/= null)                                strLine = strLine + " " + Convert.ToChar(9);                            else                            {                                string rowstr = "";                                rowstr = m_DataView.Rows[i].Cells[j].Value.ToString();                                if (rowstr.IndexOf("\r\n") > 0)                                    rowstr = rowstr.Replace("\r\n", " ");                                if (rowstr.IndexOf("\t") > 0)                                    rowstr = rowstr.Replace("\t", " ");                                strLine = strLine + rowstr + Convert.ToChar(9);                            }                        }                    }                    objStreamWriter.WriteLine(strLine);                    strLine = "";                }                objStreamWriter.Close();                objFileStream.Close();                MessageBox.Show(this, "保存EXCEL成功", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);            }        }

用DataGridView绑定的DataTable为参数,导出Excel 1public void DataToExcel(DataTable m_DataTable) 2        { 3            SaveFileDialog kk = new SaveFileDialog(); 4            kk.Title = "保存EXECL文件"; 5            kk.Filter = "EXECL文件(*.xls) |*.xls |所有文件(*.*) |*.*"; 6            kk.FilterIndex = 1; 7            if (kk.ShowDialog() == DialogResult.OK) 8            { 9                string FileName = kk.FileName + ".xls";10                if (File.Exists(FileName))11                    File.Delete(FileName);12                FileStream objFileStream;13                StreamWriter objStreamWriter;14                string strLine = "";15                objFileStream = new FileStream(FileName, FileMode.OpenOrCreate, FileAccess.Write);16                objStreamWriter = new StreamWriter(objFileStream, System.Text.Encoding.Unicode);17                for (int i = 0; i < m_DataTable.Columns.Count; i++)18                {19                    strLine = strLine + m_DataTable.Columns[i].Caption.ToString() + Convert.ToChar(9);20                }21                objStreamWriter.WriteLine(strLine);22                strLine = "";2324                for (int i = 0; i < m_DataTable.Rows.Count; i++)25                {26                    for (int j = 0; j < m_DataTable.Columns.Count; j++)27                    {28                        if (m_DataTable.Rows[i].ItemArray[j] == null)29                            strLine = strLine + " " + Convert.ToChar(9);30                        else31                        {32                            string rowstr = "";33                            rowstr = m_DataTable.Rows[i].ItemArray[j].ToString();34                            if (rowstr.IndexOf("\r\n") > 0)35                                rowstr = rowstr.Replace("\r\n", " ");36                            if (rowstr.IndexOf("\t") > 0)37                                rowstr = rowstr.Replace("\t", " ");38                            strLine = strLine + rowstr + Convert.ToChar(9);39                        }40                    }41                    objStreamWriter.WriteLine(strLine);42                    strLine = "";43                }44                objStreamWriter.Close();45                objFileStream.Close();46                MessageBox.Show(this, "保存EXCEL成功", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);47            }48        }