C#winform导出数据到Excel的类

         /// <summary>
         /// 构造函数
         /// </summary>
         public ExportData()
         {

         }
         /// <summary>
         /// 保存文件名
         /// </summary>
         private string savefilename = "";
         /// <summary>
         /// 准备导出的数据容器
         /// </summary>
         private System.Windows.Forms.DataGridView datagv;
         /// <summary>
         /// 导出excel文档
         /// </summary>
         /// <param name="d">数据所在控件</param>
         public void OutDataToExcelByDataSource(System.Windows.Forms.DataGridView dgview)
         {
             try
             {
                 if (dgview.Columns.Count < )
                 {
                     MessageBox.Show("没有导出数据。");
                     return;
                 }
                 SaveFileDialog sfd = new SaveFileDialog();
                 sfd.ValidateNames = true;
                 sfd.Filter = "Excel2003文件(*.xls)|*.xls|Excel2007文件(*.xlsx)|*.xlsx|Access文件(*.mdb)|*.mdb|DBF文件(*.dbf)|*.dbf";
                 if (sfd.ShowDialog() != DialogResult.OK)
                 {
                     return;
                 }
                 this.savefilename = sfd.FileName;
                 //检测文件名是否合法
                 string tryfile = "";
                 tryfile = savefilename.Substring(savefilename.LastIndexOf("\\") + );
                 tryfile = tryfile.Substring(, tryfile.LastIndexOf("."));
                 foreach (char c in tryfile)
                 {
                     if ("<>?:[]|*".Contains(c.ToString()))
                     {
                         MessageBox.Show("文件名包含非法字符.");
                         return;
                     }
                 }
                 this.datagv = dgview;
                 if (sfd.FileName.Substring(sfd.FileName.LastIndexOf(".")) == ".xlsx" || sfd.FileName.Substring(sfd.FileName.LastIndexOf(".")) == ".xls")
                 {
                     outToExcelByDataSource();
                 }
                 else if (sfd.FileName.Substring(sfd.FileName.LastIndexOf(".")) == ".mdb" || sfd.FileName.Substring(sfd.FileName.LastIndexOf(".")) == ".dbf")
                 {
                     outToAccessByDataSource();
                 }
             }
             catch (Exception W)
             {
                 MessageBox.Show(W.Message, "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
             }
         }
         /// <summary>
         /// 导出excel文档
         /// </summary>
         /// <param name="d">数据所在控件</param>
         public void OutDataToExcelByDataTable(System.Windows.Forms.DataGridView dgview)
         {
             try
             {
                 if (dgview.Columns.Count < )
                 {
                     MessageBox.Show("没有导出数据。");
                     return;
                 }
                 SaveFileDialog sfd = new SaveFileDialog();
                 sfd.ValidateNames = true;
                 sfd.Filter = "Excel2003文件(*.xls)|*.xls|Excel2007文件(*.xlsx)|*.xlsx|Access文件(*.mdb)|*.mdb|DBF文件(*.dbf)|*.dbf"; ;
                 if (sfd.ShowDialog() != DialogResult.OK)
                 {
                     return;
                 }
                 this.savefilename = sfd.FileName;
                 //检测文件名是否合法
                 string tryfile = "";
                 tryfile = savefilename.Substring(savefilename.LastIndexOf("\\") + );
                 tryfile = tryfile.Substring(, tryfile.LastIndexOf("."));
                 foreach (char c in tryfile)
                 {
                     if ("<>?:[]|*".Contains(c.ToString()))
                     {
                         MessageBox.Show("文件名包含非法字符.");
                         return;
                     }
                 }
                 this.datagv = dgview;
                 if (sfd.FileName.Substring(sfd.FileName.LastIndexOf(".")).ToLower() == ".xlsx" || sfd.FileName.Substring(sfd.FileName.LastIndexOf(".")).ToLower() == ".xls")
                 {
                     outToExcelByDataTable();
                 }
                 else if (sfd.FileName.Substring(sfd.FileName.LastIndexOf(".")).ToLower() == ".mdb" || sfd.FileName.Substring(sfd.FileName.LastIndexOf(".")).ToLower() == ".dbf")
                 {
                     outToAccessByDataTable();
                 }
             }
             catch (Exception W)
             {
                 MessageBox.Show(W.Message, "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
             }
         }
         /// <summary>
         /// 导出文档
         /// </summary>
         public void OutDataByDataTable(DataTable tab)
         {
             try
             {
                 if (tab.Columns.Count < )
                 {
                     MessageBox.Show("没有导出数据。");
                     return;
                 }
                 SaveFileDialog sfd = new SaveFileDialog();
                 sfd.ValidateNames = true;
                 sfd.Filter = "Excel2003文件(*.xls)|*.xls|Excel2007文件(*.xlsx)|*.xlsx|Access文件(*.mdb)|*.mdb|DBF文件(*.dbf)|*.dbf";
                 if (sfd.ShowDialog() != DialogResult.OK)
                 {
                     return;
                 }
                 this.savefilename = sfd.FileName;
                 //检测文件名是否合法
                 string tryfile = "";
                 tryfile = savefilename.Substring(savefilename.LastIndexOf("\\") + );
                 tryfile = tryfile.Substring(, tryfile.LastIndexOf("."));
                 foreach (char c in tryfile)
                 {
                     if ("<>?:[]|*".Contains(c.ToString()))
                     {
                         MessageBox.Show("文件名包含非法字符.");
                         return;
                     }
                 }
                 if (sfd.FileName.Substring(sfd.FileName.LastIndexOf(".")).ToLower() == ".xlsx" || sfd.FileName.Substring(sfd.FileName.LastIndexOf(".")).ToLower() == ".xls")
                 {
                     ExportExcelForm of = new ExportExcelForm();
                     of.mytable = tab;
                     if (of.mytable == null)
                     {
                         MessageBox.Show("没有导出数据。");
                         return;
                     }
                     of.savefimename = this.savefilename;
                     of.Show();
                 }
                 else if (sfd.FileName.Substring(sfd.FileName.LastIndexOf(".")).ToLower() == ".mdb" || sfd.FileName.Substring(sfd.FileName.LastIndexOf(".")).ToLower() == ".dbf")
                 {
                     ExportAccessForm of = new ExportAccessForm();
                     of.mytable = tab;
                     if (of.mytable == null)
                     {
                         MessageBox.Show("没有导出数据。");
                         return;
                     }
                     of.savefimename = this.savefilename;
                     of.Show();
                 }
             }
             catch (Exception W)
             {
                 MessageBox.Show(W.Message, "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
             }
         }
         /// <summary>
         /// 弹出导出窗口
         /// </summary>
         private void outToExcelByDataSource()
         {
             ExportExcelForm of = new ExportExcelForm();
             of.mytable = (DataTable)this.datagv.DataSource;
             if (of.mytable == null)
             {
                 MessageBox.Show("没有导出数据。");
                 return;
             }
             of.savefimename = this.savefilename;
             of.Show();
         }
         /// <summary>
         /// 弹出导出窗口
         /// </summary>
         private void outToExcelByDataTable()
         {
             ExportExcelForm of = new ExportExcelForm();

             DataTable dt = new DataTable();
             for (int i = ; i < this.datagv.ColumnCount; i++)
             {
                 dt.Columns.Add(this.datagv.Columns[i].HeaderText);
             }
             DataRow dr;
             for (int i = ; i < this.datagv.RowCount; i++)
             {
                 dr = dt.NewRow();
                 for (int j = ; j < this.datagv.ColumnCount; j++)
                 {
                     if (this.datagv.Columns[j].HeaderText == "sqlstring")
                     {
                         dr[j] = "";
                     }
                     else
                     {
                         if (this.datagv.Rows[i].Cells[j].Value == null)
                         {
                             dr[j] = "";
                         }
                         else
                         {
                             dr[j] = this.datagv.Rows[i].Cells[j].Value.ToString();
                         }
                     }
                 }
                 dt.Rows.Add(dr);
             }
             of.mytable = dt;
             if (of.mytable == null)
             {
                 MessageBox.Show("没有导出数据。");
                 return;
             }
             of.savefimename = this.savefilename;
             of.Show();
         }
         /// <summary>
         /// 弹出导出窗口
         /// </summary>
         private void outToAccessByDataSource()
         {
             if (this.savefilename.Substring(this.savefilename.LastIndexOf(".")).ToLower() == ".mdb")
             {
                 ExportAccessForm of = new ExportAccessForm();
                 of.mytable = (DataTable)this.datagv.DataSource;
                 if (of.mytable == null)
                 {
                     MessageBox.Show("没有导出数据。");
                     return;
                 }
                 of.savefimename = this.savefilename;
                 of.Show();
             }
             else if (this.savefilename.Substring(this.savefilename.LastIndexOf(".")).ToLower() == ".dbf")
             {
                 ExportDBFForm of = new ExportDBFForm();
                 of.mytable = (DataTable)this.datagv.DataSource;
                 if (of.mytable == null)
                 {
                     MessageBox.Show("没有导出数据。");
                     return;
                 }
                 of.savefimename = this.savefilename;
                 of.Show();
             }
         }
         /// <summary>
         /// 弹出导出窗口
         /// </summary>
         private void outToAccessByDataTable()
         {
             try
             {
                 if (this.savefilename.Substring(this.savefilename.LastIndexOf(".")).ToLower() == ".mdb")
                 {
                     ExportAccessForm of = new ExportAccessForm();
                     DataTable dt = new DataTable();
                     for (int i = ; i < this.datagv.ColumnCount; i++)
                     {
                         dt.Columns.Add(this.datagv.Columns[i].HeaderText);
                     }
                     DataRow dr;
                     for (int i = ; i < this.datagv.RowCount; i++)
                     {
                         dr = dt.NewRow();
                         for (int j = ; j < this.datagv.ColumnCount; j++)
                         {
                             if (this.datagv.Columns[j].HeaderText == "sqlstring")
                             {
                                 dr[j] = "";
                             }
                             else
                             {
                                 if (this.datagv.Rows[i].Cells[j].Value == null)
                                 {
                                     dr[j] = "";
                                 }
                                 else
                                 {
                                     dr[j] = this.datagv.Rows[i].Cells[j].Value.ToString();
                                 }
                             }
                         }
                         dt.Rows.Add(dr);
                     }
                     of.mytable = dt;
                     if (of.mytable == null)
                     {
                         MessageBox.Show("没有导出数据。");
                         return;
                     }
                     of.savefimename = this.savefilename;
                     of.Show();
                 }
                 else if (this.savefilename.Substring(this.savefilename.LastIndexOf(".")).ToLower() == ".dbf")
                 {
                     ExportDBFForm of = new ExportDBFForm();
                     DataTable dt = new DataTable();
                     for (int i = ; i < this.datagv.ColumnCount; i++)
                     {
                         dt.Columns.Add(this.datagv.Columns[i].HeaderText);
                     }
                     DataRow dr;
                     for (int i = ; i < this.datagv.RowCount; i++)
                     {
                         dr = dt.NewRow();
                         for (int j = ; j < this.datagv.ColumnCount; j++)
                         {
                             if (this.datagv.Columns[j].HeaderText == "sqlstring")
                             {
                                 dr[j] = "";
                             }
                             else
                             {
                                 if (this.datagv.Rows[i].Cells[j].Value == null)
                                 {
                                     dr[j] = "";
                                 }
                                 else
                                 {
                                     dr[j] = this.datagv.Rows[i].Cells[j].Value.ToString();
                                 }
                             }
                         }
                         dt.Rows.Add(dr);
                     }
                     of.mytable = dt;
                     if (of.mytable == null)
                     {
                         MessageBox.Show("没有导出数据。");
                         return;
                     }
                     of.savefimename = this.savefilename;
                     of.Show();
                 }
             }
             catch
             {

             }
         }