写一个循环
for (int i=0; i<dropdownlist1.Items.count; i++)
{
if( dropdownlist1.Items.value = year.tostring())
dropdownlist1.selectindex = i;
}
解决方案 »
- windows services 1053服务没有及时响应或控制请求
- 什么是强类型系统?
- GridView固定表头和首列?CSDN中至今为止没有人能回答上
- Infragistics.WebUI.UltraWebGrid录入数据,如何进行验证?
- >>怎么把数据库中的记录,在word中按一定的格式显示?
- 漠上接分!
- 关于JS encodeURIComponent() 在服务器端的反操作
- 论坛的密码怎么改?
- 送分。。
- 请问各位这 两句话分别是什么意思?Dim i as int32 Dim tmpStr as String
- WORD控件,从数据库取文档然后存回数据库,继续散分
- 这句连接Access数据库的语句如换为连接SQL Server应该如何改
private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
ArrayList arraylistYear = new ArrayList();
arraylistYear.Add("2005");
arraylistYear.Add("2003");
arraylistYear.Add("2002");
arraylistYear.Add("2004");
int year = DateTime.Now.Year;
int month = DateTime.Now.Month;
int day = DateTime.Now.Day;
dropdownlist1.DataSource = arraylistYear;
dropdownlist1.DataBind();
dropdownlist1.Items.FindByValue(year.ToString()).Selected = true;}
ListItem item=dropdownlist1.Items.FindByValue(year.ToString());
if(item!=null)
item.Selected=true;--------------------------------
AspNetPager 免费分页控件4.2版发布,同时发布最新源代码,欢迎下载:http://www.webdiyer.com
1 “ListItem”是一个类型,不能用作表达式。
2 名称“item”未声明。
3 “null”未声明。不再支持“Null”常数;请改用“System.DBNull”。
这几个问题怎么解决?再一次多谢了!我附上最初的代码:
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'在此处放置初始化页的用户代码
If Not IsPostBack Then bindlist()
End SubSub bindlist()
Int(year = DateTime.Now.Year)
Int(month = DateTime.Now.Month)
Dim mylistyear As New ArrayList()
Dim j As Integer
Dim kkk As String = "2000"
For j = 3 To 10
mylistyear.Add(kkk + j)
Next DropDownList1.DataSource = mylistyear
DropDownList1.DataBind()
DropDownList1.Items.FindByValue(year.ToString()).Selected = True Dim mylistmonth As New ArrayList()
Dim i As Integer
For i = 1 To 12
mylistmonth.Add("" & i & "")
Next
DropDownList2.DataSource = mylistmonth
DropDownList2.DataBind()
DropDownList2.Items.FindByValue(month.ToString()).Selected = True
End Sub大家帮我看一看究竟出了什么问题?
item = DropDownList1.Items.FindByValue(year.ToString())
If item <> Nothing Then
DropDownList1.SelectedIndex = DropDownList1.Items.IndexOf(item);
End If
Dim kkk As String = "2000"应该将它定义为int才能相加,或是改为
Dim kkk As String = "200"
也行你可以看生成的HTML的原码,绝对会变成20001,20002....
而不是你想要的2001,2002......
我把icyer()的代码该成
Dim item As ListItem
item = DropDownList1.Items.FindByValue(year.ToString())
If item is Nothing Then
DropDownList1.SelectedIndex = DropDownList1.Items.IndexOf(item);
End If才能通过编译,但执行的时候还是出现以下错误,我都头大了未将对象引用设置到对象的实例。
NullReferenceException: 未将对象引用设置到对象的实例。]
这句去掉可以吗!?
protected System.Web.UI.WebControls.DropDownList R_Day;
protected System.Web.UI.WebControls.DropDownList R_Month;
protected System.Web.UI.WebControls.DropDownList R_Year;
DateTime OutDate;
private void Page_Load(object sender, System.EventArgs e)
{
WhatDay("OutDate");
if(!IsPostBack)
{
}
}
public DateTime WhatDay(string DayUi)
{
int i1=1980;
int i2=0;
int i3=0;
ArrayList YearList = new ArrayList();
ArrayList MonthList = new ArrayList();
ArrayList DayList = new ArrayList();
if(!IsPostBack)
{
while(i1<2024)
{
YearList.Add (i1);
i1+=1;
}
this.R_Year.DataSource = YearList;
this.R_Year.DataBind();
while(i2<13)
{ MonthList.Add (i2);
i2+=1;
}
this.R_Month.DataSource = MonthList;
this.R_Month.DataBind(); while(i3<32)
{
DayList.Add (i3);
i3+=1;
}
this.R_Day.DataSource = DayList;
this.R_Day.DataBind();
this.R_Year.SelectedItem.Value=DateTime.Today.Year.ToString();
this.R_Month.SelectedItem.Value=DateTime.Today.Month.ToString();
this.R_Day.SelectedItem.Value=DateTime.Today.Day.ToString();
this.R_Year.SelectedItem.Text=DateTime.Today.Year.ToString();
this.R_Month.SelectedItem.Text=DateTime.Today.Month.ToString();
this.R_Day.SelectedItem.Text=DateTime.Today.Day.ToString(); }
}
}
Dim arraylistYear = New ArrayList()
arraylistYear.Add("2005")
arraylistYear.Add("2003")
arraylistYear.Add("2002")
arraylistYear.Add("2004")
Int(year = DateTime.Now.Year)
DropDownList1.DataSource = arraylistYear
DropDownList1.DataBind()
DropDownList1.Items.FindByValue(now.year.ToString()).Selected = True