引用
彩色鱼 & 软件开发 的 几种绑定DropdownList的方法
第一种,把Array数组绑到dropdownlist
程序代码
string[] Month =new string[7]{ "January", "February", "March", "April", "May", "June", "July" };
this.DropDownList1.DataSource = Month;
this.DropDownList1.DataBind();
第一种方法只可以绑定一组数据到dropdownlist,因为drawdonwlist可以绑定两种数据1是DataTextField
2 是DataValueField 所以第一种方法绑定后DataTextField的值==DataTextField值
ArrayList ar = new ArrayList();
for (int i = 1; i <=12; i++)
{
ar.Add(i+"月");
}
this.DropDownList2.DataSource = ar;
this.DropDownList2.DataBind();
直观一点的写法。
ArrayList ar = new ArrayList();
ar.Add("1月");
ar.Add("2月");
ar.Add("3月");
ar.Add("4月");
.................
this.DropDownList2.DataSource = ar;
this.DropDownList2.DataBind();
第2种方法的好处是通过ArrayList.Add的方法,可以实现动态添加元素的功能,比方说,有一个DataTable,我们要把DataTable中一行的数据读出来添加到Arraylist当中。
ArrayList ar = new ArrayList();
DataTable dt=dataset.Tables[0]
foreach (DataRow dr in dt.Rows)
{ar.Add(dr[0].ToString()); }
以上代码从一个DataTable中通过foreach语句循环读取Table中一行数据中第一个格的值添加到ArrayList当中。
Hashtable Ht = new Hashtable();
Ht.Add("January", "1月");
Ht.Add("February", "2月");
Ht.Add("March", "3月");
Ht.Add("April", "4月");
Ht.Add("May", "5月");
Ht.Add("June", "6月");
Ht.Add("July", "7月");
this.DropDownList3.DataSource = Ht;
this.DropDownList3.DataValueField = "key";
this.DropDownList3.DataTextField = "value";
this.DropDownList3.DataBind();
首先新增一个类,结构如下
public class ClassMonth
{
private string _MonthEN = DateTime.Now.ToString("MMMM",System.Globalization.CultureInfo.CreateSpecificCulture("en"));
private string _MonthCN = DateTime.Now.ToString("MMMM", System.Globalization.CultureInfo.CreateSpecificCulture("zh-CN"));
public ClassMonth()
{MonthCN = DateTime.Now.ToString("MMMM", System.Globalization.CultureInfo.CreateSpecificCulture("zh-CN"));
MonthEN = DateTime.Now.ToString("MMMM", System.Globalization.CultureInfo.CreateSpecificCulture("en"));
}
public ClassMonth(string cn,string en)
{
MonthCN = cn;//导入变量为属性赋值
MonthEN = en;//导入变量为属性赋值
}
public string MonthEN //构造属性
{
get{
return _MonthEN;
}
set
{
_MonthEN = value;
}
}
public string MonthCN //构造属性
{
get {
return _MonthCN;
}
set
{ _MonthCN = value;
}
}
}
绑定方法
ArrayList arlist=new ArrayList();
arlist.Add(new ClassMonth("1月", "January"));
arlist.Add(new ClassMonth("2月", "February"));
arlist.Add(new ClassMonth("3月", "March"));
arlist.Add(new ClassMonth("4月", "April"));
arlist.Add(new ClassMonth("5月", "May"));
this.DropDownList4.DataSource = arlist;
this.DropDownList4.DataValueField = "MonthEN";
this.DropDownList4.DataTextField = "MonthCN";
this.DropDownList4.DataBind();