DataGridView控件导出到Excel文件

什么也不说了，见代码

/// <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();  
            myStream.Close();  
        }  
    }  
}