#region DataGridView数据显示到Excel  
/// <summary>   
/// 打开Excel并将DataGridView控件中数据导出到Excel  
/// </summary>   
/// <param name="dgv">DataGridView对象 </param>   
/// <param name="isShowExcle">是否显示Excel界面 </param>   
/// <remarks>  
/// add com "Microsoft Excel 11.0 Object Library"  
/// using Excel=Microsoft.Office.Interop.Excel;  
/// </remarks>  
/// <returns> </returns>   
public bool DataGridviewShowToExcel(DataGridView dgv, bool isShowExcle)  
{  
    if (dgv.Rows.Count == 0)  
        return false;  
    //建立Excel对象   
    Excel.Application excel = new Excel.Application();  
    excel.Application.Workbooks.Add(true);  
    excel.Visible = isShowExcle;  
    //生成字段名称   
    for (int i = 0; i < dgv.ColumnCount; i++)  
    {  
        excel.Cells[1, i + 1] = dgv.Columns[i].HeaderText;  
    }  
    //填充数据   
    for (int i = 0; i < dgv.RowCount - 1; i++)  
    {  
        for (int j = 0; j < dgv.ColumnCount; j++)  
        {  
            if (dgv[j, i].ValueType == typeof(string))  
            {  
                excel.Cells[i + 2, j + 1] = "'" + dgv[j, i].Value.ToString();  
            }  
            else  
            {  
                excel.Cells[i + 2, j + 1] = dgv[j, i].Value.ToString();  
            }  
        }  
    }  
    return true;  
}  
#endregion   
 
#region DateGridView导出到csv格式的Excel  
/// <summary>  
/// 常用方法，列之间加\t，一行一行输出，此文件其实是csv文件，不过默认可以当成Excel打开。  
/// </summary>  
/// <remarks>  
/// using System.IO;  
/// </remarks>  
/// <param name="dgv"></param>  
private void DataGridViewToExcel(DataGridView dgv)  
{  
    SaveFileDialog dlg = new SaveFileDialog();  
    dlg.Filter = "Execl files (*.xls)|*.xls";  
    dlg.FilterIndex = 0;  
    dlg.RestoreDirectory = true;  
    dlg.CreatePrompt = true;  
    dlg.Title = "保存为Excel文件";  
  
    if (dlg.ShowDialog() == DialogResult.OK)  
    {  
        Stream myStream;  
        myStream = dlg.OpenFile();  
        StreamWriter sw = new StreamWriter(myStream, System.Text.Encoding.GetEncoding(-0));  
        string columnTitle = "";  
        try  
        {  
            //写入列标题  
            for (int i = 0; i < dgv.ColumnCount; i++)  
            {  
                if (i > 0)  
                {  
                    columnTitle += "\t";  
                }  
                columnTitle += dgv.Columns[i].HeaderText;  
            }  
            sw.WriteLine(columnTitle);  
  
            //写入列内容  
            for (int j = 0; j < dgv.Rows.Count; j++)  
            {  
                string columnValue = "";  
                for (int k = 0; k < dgv.Columns.Count; k++)  
                {  
                    if (k > 0)  
                    {  
                        columnValue += "\t";  
                    }  
                    if (dgv.Rows[j].Cells[k].Value == null)  
                        columnValue += "";  
                    else  
                        columnValue += dgv.Rows[j].Cells[k].Value.ToString().Trim();  
                }  
                sw.WriteLine(columnValue);  
            }  
            sw.Close();  
            myStream.Close();  
        }  
        catch (Exception e)  
        {  
            MessageBox.Show(e.ToString());  
        }  
        finally  
        {  
            sw.Close();