开发学院WEB开发ASP.NET asp.net 2.0下一个标准GRIDVIEW功能的实现(不用d... 阅读

asp.net 2.0下一个标准GRIDVIEW功能的实现(不用datasource控件)

 2006-07-21 17:13:05 来源:WEB开发网   
核心提示:在asp.net 2.0下,gridview是十分方便的了,asp.net 2.0下一个标准GRIDVIEW功能的实现(不用datasource控件),加一个DATASOURCE系列的控件的话,就可以马上和gridview绑定,为绑定咯DataSet ds = new DataSet(); SqlDataAdapte

在asp.net 2.0下,gridview是十分方便的了,加一个DATASOURCE系列的控件的话,就可以马上和gridview绑定,十分方便。但其实也可以
使用datatable或者dataview的,这个时候就不是用datasource系列控件了。下面讲下如何在asp.net 2.0下,实现gridview控件的翻页,各列排序,
编辑的功能。
   首先,我们读取的是northwind数据库中的employee表。放置一个gridview后,添加几个绑定的列,代码如下
 <asp:GridView ID="GridView1" runat="server" AllowPaging="True" AllowSorting="True"
       AutoGenerateColumns="False" CellPadding="4" ForeColor="#333333" GridLines="None"
       Width="100%" DataKeyNames="EmployeeID" OnPageIndexChanging="GridView1_PageIndexChanging" OnRowEditing="GridView1_RowEditing" OnRowUpdating="GridView1_RowUpdating" OnSorting="GridView1_Sorting" PageSize="3" OnRowCancelingEdit="GridView1_RowCancelingEdit" OnRowCommand="GridView1_RowCommand">
       <FooterStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
       <Columns>
         <asp:BoundField DataField="employeeid" HeaderText="Employee ID" ReadOnly="True" />
         <asp:BoundField DataField="firstname" HeaderText="First Name" SortExPRession="firstname" />
         <asp:BoundField DataField="lastname" HeaderText="Last Name" SortExpression="lastname" />
         <asp:CommandField ShowEditButton="True" />
       </Columns>
       <RowStyle BackColor="#FFFBD6" ForeColor="#333333" />
       <SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="Navy" />
       <PagerStyle BackColor="#FFCC66" ForeColor="#333333" HorizontalAlign="Center" />
       <HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
       <AlternatingRowStyle BackColor="White" />
     </asp:GridView>

首先,我们要实现分页,把AllowPaging设置为true,并设置每页的分页条数,最后在codebehind中写入
protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
   {
     GridView1.PageIndex = e.NewPageIndex;
     BindGrid();
   }
  为了实现每列都可以自动点击排序,可以设置allowsorting=true,然后设置OnSorting="GridView1_Sorting",其中gridview_sorting
代码为
  protected void GridView1_Sorting(object sender, GridViewSortEventArgs e)
   {
     ViewState["sortexpression"] = e.SortExpression;

   if (ViewState["sortdirection"] == null)
     {
       ViewState["sortdirection"] = "asc";
     }
     else
     {
       if (ViewState["sortdirection"].ToString() == "asc")
       {
         ViewState["sortdirection"] = "desc";
       }
       else
       {
         ViewState["sortdirection"] = "asc";
       }
     }
     BindGrid();
   }
很明显,设置viewsate来保存每次排序时的顺序,上面的相信很容易理解。
   最后,实现编辑功能,因为在aspx页面中已经设置了OnRowEditing="GridView1_RowEditing",其中GridView1_RowEditing的代码为
 protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
   {
     int empid;
     string fname, lname;
     empid = int.Parse(GridView1.Rows[e.RowIndex].Cells[0].Text);
     fname = ((TextBox)GridView1.Rows[e.RowIndex].Cells[1].Controls[0]).Text;
     lname = ((TextBox)GridView1.Rows[e.RowIndex].Cells[2].Controls[0]).Text;

   SqlConnection cnn = new SqlConnection(@"data source=localhost;initial catalog=northwind;user id=sa;passWord=123456");
     cnn.Open();
     SqlCommand cmd = new SqlCommand("update employees set firstname=@fname,lastname=@lname where employeeid=@empid", cnn);
     cmd.Parameters.Add(new SqlParameter("@fname",fname));
     cmd.Parameters.Add(new SqlParameter("@lname", lname));
     cmd.Parameters.Add(new SqlParameter("@empid", empid));
     cmd.ExecuteNonQuery();
     cnn.Close();

   GridView1.EditIndex = -1;
     BindGrid();
   }
   protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
   {
     GridView1.EditIndex = e.NewEditIndex;
     BindGrid();
   }
   protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
   {
     GridView1.EditIndex = -1;
     BindGrid();
   }

  可以看到,上面的代码和asp.net 1.1版本的其实原理是差不多的。最后,bindgrid()的过程很简单,为绑定咯
DataSet ds = new DataSet();
     SqlDataAdapter da = new SqlDataAdapter("select * from employees", @"data source=localhost;initial catalog=northwind;user id=sa;password=123456");
     da.Fill(ds,"employees");
     DataView dv = ds.Tables[0].DefaultView;

   if (ViewState["sortexpression"] != null)
     {
       dv.Sort = ViewState["sortexpression"].ToString() + " " + ViewState["sortdirection"].ToString();
     }

   GridView1.DataSource=dv;
     GridView1.DataBind();

这里gridview绑定的是dataview,并且用dv.sort设定了每次排序的顺序,也就是说,每次排序后其顺序都是保持不变的。
当然最后是page_load事件咯
  protected void Page_Load(object sender, EventArgs e)
   {
     if(!IsPostBack)
     {
       BindGrid();
     }
   }

http://jackyrong.cnblogs.com/archive/2006/07/20/455996.html

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