【发布时间】：2013-09-27 11:42:33
【问题描述】：
我想在视图状态下维护用户控件值
我试过文本框，下拉值保持在视图状态
但 BasicDatePicker 值未在视图状态下保持我得到空值
代码：
.aspx
<asp:Repeater ID="rpt1" runat="server">
<ItemTemplate>
</ItemTemplate>
</asp:Repeater>
<asp:Button ID="addnewtext" runat="server" Text="Add" onclick="addnewtext_Click" width="76px" />
<asp:Button ID="btnSaveVisa" Text="Save" runat="server" OnClick="btnSaveVisa_Click" />
.aspx.cs
private const string VIEWSTATEKEY = "ContactCount";
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
//Set the number of default controls
ViewState[VIEWSTATEKEY] = ViewState[VIEWSTATEKEY] == null ? 1 : ViewState[VIEWSTATEKEY];
//Load the contact control based on Vewstate key
LoadContactControls();
}
}
protected override void LoadViewState(object savedState)
{
base.LoadViewState(savedState);
LoadContactControls();
}
private void LoadContactControls()
{
for (int i = 0; i < int.Parse(ViewState[VIEWSTATEKEY].ToString()); i++)
{
rpt1.Controls.Add(LoadControl("AddVisaControl.ascx"));
}
}
protected void addnewtext_Click(object sender, EventArgs e)
{
LoadContactControls();
ViewState[VIEWSTATEKEY] = int.Parse(ViewState[VIEWSTATEKEY].ToString()) + 1;
}
private void saveData()
{
foreach (var control in rpt1.Controls)
{
var usercontrol = control as AddVisaControl;
string s = usercontrol.TextVisaNumber;
string date = usercontrol.ExpiryDate.ToShortDateString();
}
}
protected void Save_Click(object sender, EventArgs e)
{
saveData();
}
}
.ascx
这里我添加了 BasicDatePicker 的程序集
<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="AddVisaControl.ascx.cs" EnableViewState="false" Inherits="Pyramid.AddVisaControl" %>
<%@ Register assembly="BasicFrame.WebControls.BasicDatePicker" namespace="BasicFrame.WebControls" tagprefix="BDP" %>
<div id="divreg" runat="server">
<table id="tbl" runat="server">
<tr>
<td>
<asp:Label ID="lbl2" runat="server"></asp:Label>
</td>
</tr>
<tr>
<td> Visa Number:</td>
<td><asp:TextBox ID="txtUser" Width="160px" runat="server"/></td>
<td> Country Name:</td>
<td><asp:DropDownList ID="dropCountry" Width="165px" runat="server"> </asp:DropDownList></td>
</tr>
<tr>
<td> Type of Visa:</td>
<td><asp:DropDownList ID="dropVisa" Width="165px" runat="server"></asp:DropDownList> </td>
<td> Type of Entry:</td>
<td><asp:DropDownList ID="dropEntry" Width="165px" runat="server"></asp:DropDownList></td>
</tr>
<tr>
<td> Expiry Date</td>
<td><BDP:BasicDatePicker ID="basicdate" runat="server"></BDP:BasicDatePicker></td>
<td>
<asp:Button ID="btnRemove" Text="Remove" runat="server" OnClick="btnRemove_Click" />
</td>
</tr>
</table>
</div>
.ascx.cs
protected void Page_Load(object sender, EventArgs e)
{
txtUser.Text = Request.Form[txtUser.UniqueID];
dropCountry.SelectedValue = Request.Form[dropCountry.UniqueID];
dropVisa.SelectedValue = Request.Form[dropVisa.UniqueID];
dropEntry.SelectedValue = Request.Form[dropEntry.UniqueID];
//Here I'm getting null value
basicdate.SelectedValue = Request.Form[basicdate.UniqueID];
}
public string TextVisaNumber
{
get { return txtUser.Text; }
set { txtUser.Text = value; }
}
public DateTime ExpiryDate
{
get
{
return basicdate.SelectedDate;
}
set
{
basicdate.SelectedDate = value;
}
}
在下图中，当我给文本框、下拉列表和日期选择器时，我点击添加按钮控件添加文本框，下拉值存在但日期选择器值消失
有什么想法吗？提前致谢
【问题讨论】：
标签： c# asp.net user-controls viewstate