search, filter, paging, sorting in gridview via ADO.NET

18 四月, 2009 at 12:33 下午 發表留言

看完了書之後, 明白了database 的運作~~而且還找到了一個好site!!在這裡有一個export to excel function, 真的不錯~不過, 當加上sorting 及paging function, 就會出現一個error:

RegisterForEventValidation 只能在 Render(); 期間呼叫

問題是出現在這裡: GridView1.RenderControl(hw);
上網search找到了ans, 這似乎是由於分了paging 而引發出來的error,不過用網上的答案似乎不是我想要的效果:

這個問題,可以設定aspx原始檔中<%Page%>的以下兩個設定解決

EnableEventValidation = “false" AutoEventWireup="true"

這個方法會令到export 出來的excel 多了很多javascript 的code, 亦會出現了sorting 及paging 的interface 在excel 出現。即係得個樣又click 唔到做唔到效果個d….結果我是沒有用到。都是用回之前在網上找到的, 不過那個code原來是用sqldatasource connect 入去,而且也有很多不明朗因素。但…都要用….

最後我花了一整天的時間,終於成功了: search + filter+paging+sorting in gridview + export to excel, 不過去到最後都是出了問題, 結果夜晚要debug,不過那是一個小問題,可以到這裡看看sample

第四讲 GridView 72般绝技 

(以下code是轉貼C#精髓【月儿原创】第四讲 GridView 72般绝技)

解决方案:
页面增加一个按钮,单击事件添加如下方法:
protected void Button1_Click(object sender, EventArgs e)
    {
        Export(“application/ms-excel", “学生成绩报表.xls");
    }

    private void Export(string FileType, string FileName)
    {
        Response.Charset = “GB2312″;
        Response.ContentEncoding = System.Text.Encoding.UTF7;
        Response.AppendHeader(“Content-Disposition", “attachment;filename=" + HttpUtility.UrlEncode(FileName, Encoding.UTF8).ToString());
        Response.ContentType = FileType;
        this.EnableViewState = false;
        StringWriter tw = new StringWriter();
        HtmlTextWriter hw = new HtmlTextWriter(tw);
        GridView1.RenderControl(hw);
        Response.Write(tw.ToString());
        Response.End();
    }
//如果没有下面方法会报错类型“GridView”的控件“GridView1”必须放在具有 runat=server 的窗体标记内
   
public override void VerifyRenderingInServerForm(Control control)
    {
    }
还有由于是文件操作所以要引入名称空间IO和Text

后台代码:
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Drawing;
using System.IO;
using System.Text;
public partial class Default7 : System.Web.UI.Page
{
    SqlConnection sqlcon;
    SqlCommand sqlcom;
    string strCon = “Data Source=(local);Database=北风贸易;Uid=sa;Pwd=sa";
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            bind();

        }
    }
   
    public void bind()
    {
        string sqlstr = “select top 5 * from 飞狐工作室";
        sqlcon = new SqlConnection(strCon);
        SqlDataAdapter myda = new SqlDataAdapter(sqlstr, sqlcon);
        DataSet myds = new DataSet();
        sqlcon.Open();
        myda.Fill(myds, “飞狐工作室");
        GridView1.DataSource = myds;
        GridView1.DataKeyNames = new string[] { “身份证号码" };
        GridView1.DataBind();
        sqlcon.Close();
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        Export(“application/ms-excel", “学生成绩报表.xls");
    }

    private void Export(string FileType, string FileName)
    {
        Response.Charset = “GB2312″;
        Response.ContentEncoding = System.Text.Encoding.UTF7;
        Response.AppendHeader(“Content-Disposition", “attachment;filename=" + HttpUtility.UrlEncode(FileName, Encoding.UTF8).ToString());
        Response.ContentType = FileType;
        this.EnableViewState = false;
        StringWriter tw = new StringWriter();
        HtmlTextWriter hw = new HtmlTextWriter(tw);
        GridView1.RenderControl(hw);
        Response.Write(tw.ToString());
        Response.End();
    }
    public override void VerifyRenderingInServerForm(Control control)
    {
    }
   
}

前台
<asp:GridView ID="GridView1″ runat="server"    AutoGenerateColumns="False" CellPadding="3″ 
                         BackColor="White" BorderColor="#CCCCCC" BorderStyle="None" BorderWidth="1px" Font-Size="12px"   >
                        <FooterStyle BackColor="White" ForeColor="#000066″ />
                        <Columns>
                            <asp:BoundField DataField="身份证号码" HeaderText="编号" ReadOnly="True" />
                            <asp:BoundField DataField="姓名" HeaderText="姓名"  />
                            <asp:BoundField DataField="出生日期" HeaderText="邮政编码"  />
                            <asp:BoundField DataField="家庭住址" HeaderText="家庭住址"  />
                            <asp:BoundField DataField="邮政编码" HeaderText="邮政编码" />
                            <asp:BoundField DataField="起薪" HeaderText="起薪"  />
                          
                        </Columns>
                        <RowStyle ForeColor="#000066″ />
                        <SelectedRowStyle BackColor="#669999″ Font-Bold="True" ForeColor="White" />
                        <PagerStyle BackColor="White" ForeColor="#000066″ HorizontalAlign="Left"  CssClass="ms-formlabel DataGridFixedHeader"/>
                        <HeaderStyle BackColor="#006699″ Font-Bold="True" ForeColor="White" />
                    </asp:GridView>
        <asp:Button ID="Button1″ runat="server" OnClick="Button1_Click" Text="导出" />

读取Excel数据的代码:这个很简单的
private DataSet CreateDataSource()
    {
        string strCon;
        strCon = “Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Server.MapPath(“excel.xls") + “; Extended Properties=Excel 8.0;";
        OleDbConnection olecon = new OleDbConnection(strCon);
        OleDbDataAdapter myda = new OleDbDataAdapter(“SELECT * FROM [Sheet1$]", strCon);
        DataSet myds = new DataSet();
        myda.Fill(myds);
        return myds;
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        GridView1.DataSource = CreateDataSource();
        GridView1.DataBind();
    }

Entry filed under: ASP.NET. Tags: , , , , , , .

load data in gridview via ADO.NET search, filter, paging, sorting in gridview via ADO.NET(code)

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