内容页给自定义控件赋值后，自定义控件调用自身的值时属性值为空，这是什么情况？
我写了个用户控件ShowLoginBar，在内容页给用户控件的属性toURL赋了值，但是用户控件自身调用这个值的时候toURL的值却为空。我是菜鸟，大家多多帮忙啊！急急急急急急急！
自定义控件ShowLoginBar.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.IO;
using System.Web.Security;
namespace TraineeManagementSystem.Include.Ascx
{
public partial class ShowLoginBar : System.Web.UI.UserControl
{
public string RootPath;
private string toURL;
/// <summary>
/// toURL弹出登录框跳转的路径
/// </summary>
public string ToURL
{
get { return toURL; }
set { toURL = value; }
}
private string thisURL;
/// <summary>
/// toURL弹出登录框跳转的路径
/// </summary>
public string ThisURL
{
get { return toURL; }
set { toURL = value; }
}
private static string thisToUrl;
protected void Page_Load(object sender, EventArgs e)
{
RootPath = TraineeManagementSystem.Code.GetFilePath._ApplicationPath;
}
protected void lnkPWD_Click(object sender, EventArgs e)
{
Session["tabNumber"] = "3";
Response.Redirect("aq.aspx");
}
protected void btnLogin_Click(object sender, EventArgs e)
{
//创建链接字符串
string conStr = ConfigurationManager.ConnectionStrings["connectionString"].ConnectionString;
//创建数据库链接
SqlConnection con = new SqlConnection(conStr);
con.Open();
//使用MD5加密，将用户输入的密码加密
string passWord = FormsAuthentication.HashPasswordForStoringInConfigFile(txtPWD1.Text.Trim().ToString(), "MD5");
//创建SQL语句查询用户输入的帐号和密码是否正确
string cmdStr = "select count(*) from T_UserInfo where UserName=@UserName and Password=@Password";
//创建SqlCommand对象
SqlCommand cmd = new SqlCommand(cmdStr, con);
//添加并设置Parameter的值
cmd.Parameters.Add(new SqlParameter("UserName", SqlDbType.NVarChar, 50));
cmd.Parameters["UserName"].Value = txtUserName1.Text;
cmd.Parameters.Add(new SqlParameter("Password", SqlDbType.NVarChar, 50));
cmd.Parameters["Password"].Value = passWord;
//判断Executescalar方法返回的参数是否大于0表示登录成功，并给出提示
cmd.ExecuteScalar();
if (Convert.ToInt32(cmd.ExecuteScalar()) > 0)
{
Session["UserName"] = txtUserName1.Text;
if (chkPWD.Checked)
{
Session["PassWord"] = txtPWD1.Text;
}
System.Web.UI.Page motherPage = this.Page;
ShowMessage.ShowMessages.ShowConfirm("又登录成功了，是否跳转？",this.toURL, this.thisURL);
}
else
{
Page.ClientScript.RegisterStartupScript(this.GetType(), "False", "<script>alert('用户名或密码错误！')</script>");
}
con.Close();
}
}
}
<UserControl:ShowLoginBar runat="server" ID="ShowLogin" />
protected void imgBtnWrite_Click(object sender, ImageClickEventArgs e)
{
if (Session["UserName"] == null)
{
ShowLogin.ToURL= "~/Admin/WriteContents.aspx";
ShowLogin.ThisURL = this.Request.Path;
Page.ClientScript.RegisterStartupScript(this.GetType(), "Success", "<script>showFloat()</script>");
}
else
Response.Redirect("~/Admin/WriteContents.aspx");
}
