导出Excel

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 == 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 == null)
                                strLine = strLine + " " + Convert.ToChar(9);
                            else
                            {
                                string rowstr = "";
                                rowstr = m_DataView.Rows[i].Cells[j].Value.ToString();
                                if (rowstr.IndexOf("
") > 0)
                                    rowstr = rowstr.Replace("
", " ");
                                if (rowstr.IndexOf("	") > 0)
                                    rowstr = rowstr.Replace("	", " ");
                                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 = "";
23
24                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                        else
31                        {
32                            string rowstr = "";
33                            rowstr = m_DataTable.Rows[i].ItemArray[j].ToString();
34                            if (rowstr.IndexOf("
") > 0)
35                                rowstr = rowstr.Replace("
", " ");
36                            if (rowstr.IndexOf("	") > 0)
37                                rowstr = rowstr.Replace("	", " ");
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        }