DataList编辑,更新,删除及模板的使用

DataList 提供相关的编辑模板，但和DataGrid不一样的是，DataList没有编辑按钮。要在DataList中使用编辑功能,可在项模板中增加一个按 钮，Linkbutton和Button都可以。在CommandName中设置为Edit就可以把此按钮和DataList的编辑事件联系起来了。
如：
编辑按钮可以使用CommandName="Edit"
更新按钮可以使用CommandName="Update"
取消按钮可以使用CommandName="Cancel"

删除按钮可以使用CommandName="Delete"

来实现。
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控件设置：
<asp:DataList ID="UserList" DataKeyField="Uid"OnItemCreated="UserList_ItemCreated"OnUpdateCommand="UserList_OnUpdateCommand"OnDeleteCommand="UserList_OnDeleteCommand" runat="server"Width="100%" RepeatColumns="6"OnEditCommand="UserList_OnEditCommand"OnCancelCommand="UserList_OnCancelCommand">

    <HeaderTemplate>

     <table width="100%" border="0"cellpadding="0" cellspacing="0" bgcolor="#E2EEF5">

    <tr>

      <td width="17%"height="25" align="center" bgcolor="#E8F0F7">登陆名称</td>

      <td width="15%"align="center" bgcolor="#E8F0F7">真实姓名</td>

      <td width="17%"align="center" bgcolor="#E8F0F7">所属用户组</td>

      <td width="25%"align="center" bgcolor="#E8F0F7">拥有权限</td>

      <td width="14%"align="center" bgcolor="#E8F0F7">创建时间</td>

      <td width="12%"align="center" bgcolor="#E8F0F7">操作</td>

    </tr>

    </HeaderTemplate>

    <ItemTemplate>

     <tr>

      <td height="25"bgcolor="#FFFFFF"><img src="images/FriendICO.gif"width="15" height="15" style="margin-left:5px;"/> [<%#Eval("Uname")%>]<asp:ImageID="StateICO"ImageUrl='<%#GetUserState(Eval("uState").ToString()) %>'width="12" height="12" runat="server"/></td>

      <td align="center"bgcolor="#FFFFFF"><%#Eval("Rname")%></td>

      <td align="center" bgcolor="#FFFFFF"><%#Eval("UserGroup")%></td>

      <td align="center"bgcolor="#FFFFFF"><%#Eval("Purview")%></td>

      <td align="center"bgcolor="#FFFFFF"><%#Eval("Ctimes","{0:d}")%></td>

      <td align="center"bgcolor="#FFFFFF"><img src="images/Edit_ICOS.gif"width="14" height="15" border="0"align="absmiddle" /><asp:LinkButtonCommandName="Edit"

             ID="Edit_But" ForeColor="#003366"runat="server">编辑</asp:LinkButton> <imgsrc="images/DEL_ICOS.gif" width="14" height="15"border="0" align="absmiddle" /><asp:LinkButtonCommandName="Delete"

             ID="Del_But" ForeColor="#003366" runat="server">删除</asp:LinkButton></td>

    </tr>

    </ItemTemplate>
    <EditItemTemplate>

    <tr>

      <td height="25" bgcolor="#E8F0F7"><imgsrc="images/FriendICO.gif" width="15" height="15"style="margin-left:5px;"/> <%#Eval("Uname")%><asp:CheckBoxID="User_State"Checked='<%#GetBoxState(Eval("uState").ToString().Trim()) %>'runat="server" Text="启用账户"
/>

      </td>

          <tdalign="center" bgcolor="#E8F0F7"><asp:TextBoxID="User_Rname" runat="server" CssClass="inputX"

                 Text='<%#Eval("Rname")%>'Width="80px"></asp:TextBox>

          </td>

          <tdalign="center" bgcolor="#E8F0F7">

             <asp:DropDownList ID="User_Group" runat="server"CssClass="FontBlue12">

                 <asp:ListItem Value="Guest">来宾组</asp:ListItem>

                 <asp:ListItem Value="Editor">编辑组</asp:ListItem>

                 <asp:ListItem Value="System">系统组</asp:ListItem>

             </asp:DropDownList>

          </td>

          <tdalign="center" bgcolor="#E8F0F7">

             <asp:CheckBoxList ID="User_Priv" runat="server"CssClass="FontBlue12"

                 RepeatDirection="Horizontal">

                 <asp:ListItem Value="r">读</asp:ListItem>

                 <asp:ListItem Value="w">写</asp:ListItem>

                 <asp:ListItem Value="e">编辑</asp:ListItem>

                 <asp:ListItem Value="d">删除</asp:ListItem>

             </asp:CheckBoxList>

          </td>

           <tdalign="center" bgcolor="#E8F0F7"><%#Eval("Ctimes","{0:d}")%></td>

          <td align="center"bgcolor="#E8F0F7">

             <img align="absmiddle" border="0" height="15"src="images/Update_ICOS.gif"

                 width="14" /><asp:LinkButton ID="Update_But"runat="server"

                 CommandName="Update" ForeColor="#003366">更新</asp:LinkButton> <img align="absmiddle"border="0" height="15"src="images/Cancel_ICOS.gif"

                 width="14" /><asp:LinkButton ID="Cancel_But"runat="server"

                 CommandName="Cancel" ForeColor="#003366">取消</asp:LinkButton>

          </td>

      

    </tr>
    </EditItemTemplate>

    <FooterTemplate>

    </table>

    </FooterTemplate>

    </asp:DataList>
后台代码：
//取消编辑

protected void UserList_OnCancelCommand(object sender,DataListCommandEventArgs e)

    {

        this.UserList.EditItemIndex = -1;

        GetUserList();

    }
//DataList编辑

   protected void UserList_OnEditCommand(object sender,DataListCommandEventArgs e)

    {

        this.UserList.EditItemIndex =e.Item.ItemIndex;

        GetUserList();

    }
//DataList更新

protected void UserList_OnUpdateCommand(object sender,DataListCommandEventArgs e)

    {

        string id =this.UserList.DataKeys[e.Item.ItemIndex].ToString(); //使用前需先设置DataList的DataKeyField="Uid"        

        string Rname = ((TextBox)e.Item.FindControl("User_Rname")).Text.Trim();//取得DataList中ID为"User_Rname"的TextBox中的值
       string UserGroup =((DropDownList)e.Item.FindControl("User_Group")).SelectedValue.Trim();

        string UserPurview = "";

        for (int i = 0; i <((CheckBoxList)e.Item.FindControl("User_Priv")).Items.Count; i++)

        {

            if(((CheckBoxList)e.Item.FindControl("User_Priv")).Items[i].Selected ==true)

            {

               UserPurview +=((CheckBoxList)e.Item.FindControl("User_Priv")).Items[i].Value + ",";

            }

       

        }

        if (UserPurview != "")

        {

            UserPurview= UserPurview.Substring(0, UserPurview.Length - 1);

        }

        int usstate = 0;

        if(((CheckBox)e.Item.FindControl("User_State")).Checked == true)

        {

            usstate = 1;

        }

        string sql = "update SystemUserset uState =" + usstate + ",UserGroup='" + UserGroup +"',Rname='" + Rname + "',Purview='" + UserPurview + "'where uid=" + id + "";

        ConnDB db = new ConnDB();

        if (db.EditDatabase(sql))

        {

           msgBox.Alert("编辑成功！", "SysUser_Admin.aspx");

        }

        else

        {

           msgBox.Alert("编辑失败！" +((CheckBox)e.Item.FindControl("User_State")).ToString());

        }
    }
//DataList删除对话框

protected void UserList_ItemCreated(object sender,System.Web.UI.WebControls.DataListItemEventArgs e)

    {

        if (e.Item.ItemType ==ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)

        {

            LinkButtonlbDelete = (LinkButton)e.Item.FindControl("Del_But");lbDelete.Attributes.Add("onclick", "return confirm(/"确定删除这个用户吗？/");");

        }

    }
//DataList删除

     protected void UserList_OnDeleteCommand(object sender,DataListCommandEventArgs e)

    {

        string id =this.UserList.DataKeys[e.Item.ItemIndex].ToString();
//使用前需先设置DataList的DataKeyField="Uid"

       string sql = "delete from SystemUser where Uid=" + id + "";

        ConnDB db = new ConnDB();

        if (db.EditDatabase(sql))

        {

           msgBox.Alert("已删除！","SysUser_Admin.aspx");

        }

        else

        {

            msgBox.Alert("删除失败！", "SysUser_Admin.aspx");

        }

        GetUserList();

    }
//DataList数据绑定

   private void DataListDataBind()

   {

    SqlConnection conn=newSqlConnection(System.Configuration.ConfigurationSettings.AppSettings["DataBaseCon"].ToString());

    SqlDataAdapter da=new SqlDataAdapter("select * fromEmployees",conn);

    DataSet ds=new DataSet();

    try

    {

     da.Fill(ds,"testTable");

    dlEditItem.DataSource=ds.Tables["testTable"];

     dlEditItem.DataBind();

    }

    catch(Exception error)

    {

     Response.Write(error.ToString());

    }

   }