【转载百度经验】DropDownList控件赋值

本文主要是介绍【转载百度经验】DropDownList控件赋值，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

DropDownList控件赋值简而言之，就是取出数据，通过DropDownList.Items.Add()，循环赋值。
具体步骤如下：
    ①根据业务查出DropDownList控件的DataSet，从DataSet实例中取出DataTable。
    ②然后循环遍历DataTable的DataRow，从对应的DataRow对象中取出要显示的字段和序列的字段，创建new ListItem(显示的字段, 序列的字段)创建ListItem对象。
    ③设定DropDownList.Items.Add(ListItem对象)方法。
实际例子：
①取出DataSet       
#region 页面加载时新闻类别绑定       
/// <summary>       
/// 页面加载时新闻类别绑定       
/// </summary>       
private void DropDownList_ArticleClass_DataBind()       
{           
Maticsoft.BLL.job_news_category bll_tb_articleclass = new Maticsoft.BLL.job_news_category();           
DataSet ds = bll_tb_articleclass.GetAllList();           
DataTable dt = ds.Tables[0];           
LTP.Common.PublicFc.DropList_Bind1(dt, DropDownList_catid);       
}       
#endregion 
②条件满足parentid=0的数据赋值给DropDownList       
#region 新闻分层显示类别层次       
/// <summary>       
/// 可选父类显示       
/// </summary>       
public static void DropList_Bind1(DataTable dt, DropDownList dropDownList)      
{            
dropDownList.Items.Clear();           
if(dropDownList.ID == "DropDownList_catid")           
{               
dropDownList.Items.Add(new ListItem("不限类别", "0"));           
}           
else           
{               
dropDownList.Items.Add(new ListItem("顶级根类", "0"));           
}            
DataRow[] drs;           
drs = dt.Select("parentid=0", "catid ASC");           
if (drs.Length > 0)           
{               
foreach (DataRow dr in drs)               
{                   
string className = "╋" + dr["catName"].ToString();                   
string valueID = dr["catid"].ToString();                   
int fatherID = int.Parse(valueID);                   
dropDownList.Items.Add(new ListItem(className, valueID));                   
ChileNodeBind1(fatherID, dt, System.Web.HttpContext.Current.Server.HtmlDecode("&nbsp;&nbsp;"), dropDownList);               
}           
}        
}     
③条件满足"parentid=" + fatherID, "catid ASC"的数据赋值给DropDownList       
private static void ChileNodeBind1(int fatherID, DataTable dt, string prefix, DropDownList dropDownList)       
{           
DataRow[] drs;           
drs = dt.Select("parentid=" + fatherID, "catid ASC");           
if (drs.Length > 0)           
{               
foreach (DataRow dr in drs)               
{                   
string className = prefix + "『" + dr["catname"].ToString() + "』";                   
string valueID = dr["catid"].ToString();                    fatherID = int.Parse(valueID);                    dropDownList.Items.Add(new ListItem(className, valueID));                   
//prefix = System.Web.HttpContext.Current.Server.HtmlDecode("&nbsp;&nbsp;") + prefix;                   
ChileNodeBind1(fatherID, dt, prefix, dropDownList);               
}          
}       
}       
#endregion 

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