ListView控件学习系列2-编辑ListView
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一、编辑,取消,更新操作
首先拖一个ListView控件到页面,然后按如下代码进行调整,这里为了利用ListView控件中按钮的内置功能CommandName必须和我们这里的名字一样
<asp:ListView ID="ListView1" runat="server" OnItemEditing="ListView1_ItemEditing"
OnItemCanceling="ListView1_ItemCanceling" OnItemUpdating="ListView1_ItemUpdating">
<ItemTemplate>
<tr>
<td>
<%#Eval("ID") %>
</td>
<td>
<%#Eval("name") %>
</td>
<td>
<asp:Button ID="EditButton" runat="server" Text="Edit" CommandName="Edit" />
</td>
</tr>
</ItemTemplate>
<EditItemTemplate>
<tr>
<td>
<asp:Label ID="IDLable" runat="server" Text='<%#Eval("ID") %>' />
</td>
<td>
<asp:TextBox ID="NameTextBox" runat="server" Text='<%#Bind("Name") %>' />
</td>
<td>
<asp:Button ID="UpdateButton" runat="server" CommandName="Update" Text="Update" />
<asp:Button ID="CancelButton" runat="server" CommandName="Cancel" Text="Cancel" />
</td>
</tr>
</EditItemTemplate>
<LayoutTemplate>
<table>
<tr runat="server" id="itemPlaceholder">
</tr>
</table>
</LayoutTemplate>
</asp:ListView>
这里我们在App_Code文件夹中添加DataAccess类来模拟数据提供,代码如下:
public class DataAccess
{
public List<Employee> List;
public DataAccess()
{
List = new List<Employee>();
Employee e1 = new Employee {ID=1, Name = "lfm1", Age = 30 };
Employee e2 = new Employee {ID=2, Name = "lfm2", Age = 30 };
Employee e3 = new Employee {ID=3, Name = "lfm3", Age = 30 };
Employee e4 = new Employee {ID=4, Name = "lfm4", Age = 30 };
Employee e5 = new Employee {ID=5, Name = "lfm5", Age = 30 };
Employee e6 = new Employee {ID=6, Name = "lfm6", Age = 30 };
List.Add(e1);
List.Add(e2);
List.Add(e3);
List.Add(e4);
List.Add(e5);
List.Add(e6);
}
}
public class Employee
{
public int ID { get; set; }
public string Name { get; set; }
public int Age { get; set; }
public int Sex { get; set; }
}
页面的后台代码如下:
public partial class _Default : System.Web.UI.Page
{
DataAccess da = new DataAccess();
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
Bind();
}
}
private void Bind()
{
ListView1.DataSource = da.List;
ListView1.DataBind();
}
protected void ListView1_ItemEditing(object sender, ListViewEditEventArgs e)
{
ListView1.EditIndex = e.NewEditIndex;
Bind();
}
protected void ListView1_ItemUpdating(object sender, ListViewUpdateEventArgs e)
{
foreach (var item in da.List)
{
if (item.ID.ToString() == ((Label)ListView1.Items[e.ItemIndex].FindControl("IDLable")).Text)
{
item.Name = ((TextBox)ListView1.Items[e.ItemIndex].FindControl("NameTextBox")).Text;
}
}
ListView1.EditIndex = -1;
Bind();
}
protected void ListView1_ItemCanceling(object sender, ListViewCancelEventArgs e)
{
ListView1.EditIndex = -1;
Bind();
}
}
这里需要注意在Page_Load中绑定时必须判断是否是回发,如果是回发状态则不能重新绑定,因为如果重新绑定则相应的事件不会被触发
二、删除操作
前端代码
<asp:ListView ID="ListView1" runat="server" OnItemDeleting="ListView1_ItemDeleting">
<ItemTemplate>
<tr>
<td>
<asp:Label ID="IDLable" runat="server" Text='<%#Eval("ID") %>' />
</td>
<td>
<%#Eval("name") %>
</td>
<td>
<asp:Button ID="EditButton" runat="server" Text="Edit" CommandName="Edit" />
</td>
<td>
<asp:Button ID="DeleteButton" runat="server" Text="Delete" CommandName="Delete" />
</td>
</tr>
</ItemTemplate>
<LayoutTemplate>
<table>
<tr runat="server" id="itemPlaceholder">
</tr>
</table>
</LayoutTemplate>
</asp:ListView>
因为这里是模拟数据提供,所以数据的状态我们暂且用Session保存,后台代码如下:
public partial class _Default : System.Web.UI.Page
{
DataAccess da;
protected void Page_Load(object sender, EventArgs e)
{
if (Session["da"] == null)
{
da = new DataAccess();
Session["da"] = da;
}
else
{
da = Session["da"] as DataAccess;
}
if (!IsPostBack)
{
Bind();
}
}
protected void ListView1_ItemDeleting(object sender, ListViewDeleteEventArgs e)
{
foreach (var item in da.List)
{
string currentID = ((Label)ListView1.Items[e.ItemIndex].FindControl("IDLable")).Text;
if (item.ID.ToString() == currentID)
{
da.List.Remove(item);
break;
}
}
Bind();
}
}
三、插入操作
ListView的Insert Mode通过其属性InsertItemPosition来控制,该属性的取值有三种:
None:非Insert状态
FirstItem:Insert状态,且编辑模板显示于ListView所有item的最前面
LastItem :Insert状态,且编辑模板显示于ListView所有item的最后面
前端代码:
<asp:ListView ID="ListView1" runat="server" OnItemInserting="ListView1_ItemInserting">
<LayoutTemplate>
<table id="Table1" runat="server" border="0" style="">
<tr runat="server" id="itemPlaceholder" />
</table>
</LayoutTemplate>
<ItemTemplate>
<tr>
<td>
<%#Eval("ID") %>
</td>
<td>
<asp:Label ID="idLabel" runat="server" Text='<%# Eval("name") %>' />
</td>
<td>
<asp:Label ID="xLabel" runat="server" Text='<%# Eval("age") %>' />
</td>
</tr>
</ItemTemplate>
<InsertItemTemplate>
<tr style="">
<td>
<asp:Button ID="InsertButton" runat="server" CommandName="Insert" Text="插入" />
<asp:Button ID="CancelButton" runat="server" CommandName="Cancel" Text="清除" />
</td>
<td>
<asp:TextBox ID="IDTextBox" runat="server" />
</td>
<td>
<asp:TextBox ID="NameTextBox" runat="server" />
</td>
<td>
<asp:TextBox ID="AgeTextBox" runat="server" />
</td>
</tr>
</InsertItemTemplate>
</asp:ListView>
<asp:Button ID="Button1" runat="server" Text="插入" OnClick="Button1_Click" />
后台代码
public partial class Default3 : System.Web.UI.Page
{
DataAccess da;
protected void Page_Load(object sender, EventArgs e)
{
if (Session["da"] == null)
{
da = new DataAccess();
Session["da"] = da;
}
else
{
da = Session["da"] as DataAccess;
}
if (!IsPostBack)
{
Bind();
}
}
private void Bind()
{
ListView1.DataSource = da.List;
ListView1.DataBind();
}
protected void ListView1_ItemInserting(object sender, ListViewInsertEventArgs e)
{
int id = Convert.ToInt32(((TextBox)e.Item.FindControl("IDTextBox")).Text);
string name= ((TextBox)e.Item.FindControl("NameTextBox")).Text;
int age = Convert.ToInt32(((TextBox)e.Item.FindControl("AgeTextBox")).Text);
Data.Employee employee = new Data.Employee { ID = id, Name = name, Age = age };
ListView1.InsertItemPosition = InsertItemPosition.None;
da.List.Add(employee);
Bind();
}
protected void Button1_Click(object sender, EventArgs e)
{
ListView1.InsertItemPosition = InsertItemPosition.LastItem;
Bind();
}
protected void ListView1_ItemCanceling(object sender, ListViewCancelEventArgs e)
{
ListView1.InsertItemPosition = InsertItemPosition.None;
Bind();
}
}
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