彩票走势图

1、Excel数据导入到数据库中：
在页面放置1个按钮控件(Button1)和1个文件上传控件(FileUpload1)
    protected void Page_Load(object sender, EventArgs e)
    {
        GridView1.Visible = false;
    }
    protected void Button1_Click(object sender, EventArgs e)
    {

        try
        {
            if (FileUpload1.PostedFile.FileName != "")
            {
                string filepath = FileUpload1.PostedFile.FileName;
                string filename = filepath.Substring(filepath.LastIndexOf("\\") + 1);
                string sheetname = "Sheet1";
                string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filepath + ";Extended Properties=Excel 8.0;";
                OleDbConnection conn = new OleDbConnection(strConn);
                OleDbDataAdapter oada = new OleDbDataAdapter("select * from [" + sheetname + "$]", conn);
                DataSet ds = new DataSet();
                oada.Fill(ds);
                GridView1.DataSource = ds;
                GridView1.DataBind();
                GridView1.Visible = true;
            }
        }
        catch (Exception error)
        {
            this.Label1.Text = "上传发生错误！原因：" + error.ToString();
        }
    }

注意把Excel文件属性中加入ASPNET用户权限，不然不能导入

3、将数据库中的数据导入Excel中，在这里我讲叙自己实践中的两个方法：

方法一：从最基本的写文件入手，将从数据库中读出来的数据写入到Excel中；

//该方法实现将数据导入到Excel文件中，其中的DataTable dt就是你需要将数据写入到Excel中的数据；
public void ExportExcel( DataTable dt , StreamWriter w )
...{
    try
    ...{
        for( int i = 0 ; i < dt.Columns.Count ; i ++ )
        ...{
             w.Write ( dt.Columns[i] );
             w.Write( ' ' );
         }
  &nbsp;      w.Write ( " " );

        object[] values = new object [dt.Columns.Count];
        foreach ( DataRow dr in dt.Rows )
        ...{
             values = dr.ItemArray ;
            for ( int i = 0 ; i < dt.Columns.Count ; i++ )
            ...{
                 w.Write ( values[i] );
                 w.Write ( ' ' );
             }
             w.Write ( " " );
         }
         w.Flush();
         w.Close();
     }
    catch
    ...{
         w.Close();
     }
}

StreamWriter w就是你自己创建的一个流，创建该数据流时，你需要自己指定需要将数据写入到那个文件，即指定文件路径，要实现下载的话，就可以简单的用Response.Redirect

( "指定需要被下载的文件路径" );

方法二：该方法实现的是将数据从DataGrid中导入到Excel中：

//filename为Excel的名字，ToExcelGrid就是数据源，在此为DataGrid数据源；
private void ExportExcelFromDataGrid( string filename , System.Web.UI.WebControls.DataGrid ToExcelGrid )
...{
     Response.Clear();
     Response.Buffer= true;    
     Response.Charset="utf-8";          
     Response.AppendHeader("Content-Disposition","attachment;filename="+Server.UrlEncode ( filename ) );    
     Response.ContentEncoding=System.Text.Encoding.GetEncoding("utf-8");//设置输出流为简体中文  
     Response.ContentType = "application/ms-excel";//设置输出文件类型为excel文件。    
    this.EnableViewState = false;          
     System.Globalization.CultureInfo myCItrad = new System.Globalization.CultureInfo("ZH-CN",true);  
     System.IO.StringWriter oStringWriter = new System.IO.StringWriter(myCItrad);    
     System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter);  
     ToExcelGrid.RenderControl(oHtmlTextWriter);    
     Response.Write(oStringWriter.ToString());  
     Response.End();

Excel导出：
页面上放一个GridView控件，ID为GridView1，添加个导出按钮ID为Button2

    protected void Button2_Click(object sender, EventArgs e)
    {
        Response.Clear();
        Response.Buffer = true;
        Response.Charset = "GB2312";
        Response.AppendHeader("Content-Disposition", "attachment;filename=FileName.xls");
        // 如果设置为 GetEncoding("GB2312");导出的文件将会出现乱码！！！
        Response.ContentEncoding = System.Text.Encoding.UTF7;
        Response.ContentType = "application/ms-excel";//设置输出文件类型为excel文件。
        System.IO.StringWriter oStringWriter = new System.IO.StringWriter();
        System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter);
        this.GridView1.RenderControl(oHtmlTextWriter);
        Response.Output.Write(oStringWriter.ToString());
        Response.Flush();
&nbsp;       Response.End();

    }

页面后台必须重写这两个方法，不然出现错误！
    public override void VerifyRenderingInServerForm( Control control )
    {

    }
    protected override void Render(HtmlTextWriter writer)
    {
        if (Page != null)
        {
            Page.VerifyRenderingInServerForm(this);
        }
        base.Render(writer);
    }

将GridView打印出来，添加个打印按钮，ID为Button4
    protected void Button4_Click(object sender, EventArgs e)
    {
        Response.Write("<script> window.print()</script>");
    }

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