ListView控件的Insert、Edit和Delete功能第三部分（自我总结）

1.刚开始在第一部分显示数据的时候出现如下错误：

修改：

@Page 中的EnableEventValidation="false"

2.点击各个按钮没有反应。

修改:为page_load事件加判断是否回发。if (!Page.IsPostBack)

3.ItemPlaceholderID和<asp:PlaceHolder ID="Layout" runat="server"></asp:PlaceHolder>

3. ListViewInsertEventArgs e    中可以通过 var temp = e.Values;可以通过键值来得到value的值。

源代码：

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="NX.Manage.WebForm1" EnableEventValidation="false" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
<asp:listview ID="ListView1" runat="server" ItemPlaceholderID="Layout" 
            onitemcommand="ListView1_ItemCommand" 
            oniteminserting="ListView1_ItemInserting" 
            onitemupdating="ListView1_ItemUpdating" DataKeyNames="Value" 
            onitemediting="ListView1_ItemEditing">
<LayoutTemplate>
<ul>
<asp:PlaceHolder ID="Layout" runat="server"></asp:PlaceHolder>
</ul>
</LayoutTemplate>
<ItemTemplate>
 <li><%# Eval("Name") %> (#<%# Eval("Value") %>)</li><asp:Button runat="server" ID="Create" CommandName="Create" Text="New" />
 <asp:Button runat="server" ID="Edit" CommandName="Edit" Text="Edit" />
</ItemTemplate>
<EmptyDataTemplate>
    <asp:Button runat="server" ID="Create" CommandName="Create" Text="New" />
</EmptyDataTemplate>
<InsertItemTemplate>
    <li>Name: <asp:TextBox runat="server" ID="NewName" Text='<%# Bind("Name") %>' /><br /> 
       Value: <asp:TextBox runat="server" ID="NewValue" Text='<%# Bind("Value") %>' />
    <asp:Button runat="server" ID="Insert" Text="Save" CommandName="Insert" /> </li><br />
</InsertItemTemplate>
<EditItemTemplate>
    <li>Name: <asp:TextBox runat="server" ID="Name" Text='<%# Bind("Name") %>' />
     Value: <asp:TextBox runat="server" ID="Value" Text='<%# Bind("Value") %>' /> <br />    
      <asp:Button runat="server" ID="Update" Text="Save" CommandName="Update" />
     </li>
</EditItemTemplate>
</asp:listview>
    </div>
    </form>
</body>
</html>

后台代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace NX.Manage
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        static readonly string SESSION_KEY = "_sk_dataentry_";
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {
                ListView1.DataSource = Data;
                ListView1.DataBind();
            }
        }
        protected List<DataEntry> Data
        {
            get
            {
                List<DataEntry> data = Session[SESSION_KEY] as List<DataEntry>;
                if (data == null)
                {
                    data = new List<DataEntry>();
                    data.Add(new DataEntry { Name = "James", Value = 1 });
                    data.Add(new DataEntry { Name = "Ash", Value = 2 });
                    data.Add(new DataEntry { Name = "Lulu", Value = 3 });
                    ViewState[SESSION_KEY] = data;
                }

                return data;
            }
            set { Session[SESSION_KEY] = value; }
        }

        protected void ListView1_ItemCommand(object sender, ListViewCommandEventArgs e)
        {
            if (e.CommandName == "Create")
            {
                ListView1.InsertItemPosition = InsertItemPosition.LastItem;
                BindData();
            }
        }

        private void BindData()
        {
            ListView1.DataSource = Data;
            ListView1.DataBind();
        }

        protected void ListView1_ItemInserting(object sender, ListViewInsertEventArgs e)
        {
            var temp = e.Values;
            ListViewItem item = e.Item;
            try
            {
                string name = (item.FindControl("NewName") as TextBox).Text;
                int value = int.Parse((item.FindControl("NewValue") as TextBox).Text);
                List<DataEntry> data = Data;
                data.Add(new DataEntry { Name = name, Value = value });
                Data = data;

                ListView1.InsertItemPosition = InsertItemPosition.None;

                BindData();
            }
            catch { }
        }

        protected void ListView1_ItemUpdating(object sender, ListViewUpdateEventArgs e)
        {
            var c= e.OldValues;
            var f= e.NewValues;
            int value = int.Parse(ListView1.DataKeys[e.ItemIndex].Value.ToString());
            List<DataEntry> data = Data;
            DataEntry entry = data.Single(d => d.Value == value);
            entry.Name = (ListView1.Items[e.ItemIndex].FindControl("Name") as TextBox).Text;
            entry.Value = int.Parse((ListView1.Items[e.ItemIndex].FindControl("Value") as TextBox).Text);
            Data = data;
            ListView1.EditIndex = -1;
            BindData();

        }

        protected void ListView1_ItemEditing(object sender, ListViewEditEventArgs e)
        {
            ListView1.EditIndex = e.NewEditIndex;
            BindData();
        }

     
    }
    [Serializable]
    public class DataEntry
    {
        public string Name { get; set; }
        public int Value { get; set; }
       
    }
}

 

posted @ 2015-07-09 11:06  秋水惜朝  阅读(526)  评论(0)  编辑  收藏  举报