http://singlepine.cnblogs.com/articles/353453.html protected System.Web.UI.WebControls.DropDownList Dropdownlist3;
private void Page_Load(object sender, System.EventArgs e)
{
DataTable dt = GetData();
BindData(dt,0);
}
private void BindData(DataTable dt,int id)
{
DataView dv = new DataView(dt);
dv.RowFilter = "parentid = " + id.ToString();
int m=0;
foreach(DataRowView drv in dv)
{
m++;
string blank="";
if(id!=0)
{
for(int i=0;i<m;i++)
{
blank+="空格";
}
}
ListItem li=new ListItem();
li.Text=blank+drv["id"].ToString()+drv["name"].ToString();
li.Value=drv["id"].ToString();
this.Dropdownlist3.Items.Add(li);
BindData(dt,Convert.ToInt32(drv["id"]));
}
}===========================================
DataTable dt;
dt = new DataTable(); dt.Columns.Add("id");
dt.Columns.Add("parentid");
dt.Columns.Add("name");
DataRow dr;
dr = dt.NewRow();
dr["id"] = "1";
dr["parentid"] = "0";
dr["name"] = "a";
dt.Rows.Add(dr); dr = dt.NewRow();
dr["id"] = "2";
dr["parentid"] = "1";
dr["name"] = "b";
dt.Rows.Add(dr); dr = dt.NewRow();
dr["id"] = "3";
dr["parentid"] = "1";
dr["name"] = "c";
dt.Rows.Add(dr); dr = dt.NewRow();
dr["id"] = "4";
dr["parentid"] = "2";
dr["name"] = "d";
dt.Rows.Add(dr); dr = dt.NewRow();
dr["id"] = "5";
dr["parentid"] = "2";
dr["name"] = "e";
dt.Rows.Add(dr); dr = dt.NewRow();
dr["id"] = "6";
dr["parentid"] = "3";
dr["name"] = "f";
dt.Rows.Add(dr);
return dt;
===========================================
怎么显示出来的结果不对的,那里出问题了??
private void Page_Load(object sender, System.EventArgs e)
{
DataTable dt = GetData();
BindData(dt,0);
}
private void BindData(DataTable dt,int id)
{
DataView dv = new DataView(dt);
dv.RowFilter = "parentid = " + id.ToString();
int m=0;
foreach(DataRowView drv in dv)
{
m++;
string blank="";
if(id!=0)
{
for(int i=0;i<m;i++)
{
blank+="空格";
}
}
ListItem li=new ListItem();
li.Text=blank+drv["id"].ToString()+drv["name"].ToString();
li.Value=drv["id"].ToString();
this.Dropdownlist3.Items.Add(li);
BindData(dt,Convert.ToInt32(drv["id"]));
}
}===========================================
DataTable dt;
dt = new DataTable(); dt.Columns.Add("id");
dt.Columns.Add("parentid");
dt.Columns.Add("name");
DataRow dr;
dr = dt.NewRow();
dr["id"] = "1";
dr["parentid"] = "0";
dr["name"] = "a";
dt.Rows.Add(dr); dr = dt.NewRow();
dr["id"] = "2";
dr["parentid"] = "1";
dr["name"] = "b";
dt.Rows.Add(dr); dr = dt.NewRow();
dr["id"] = "3";
dr["parentid"] = "1";
dr["name"] = "c";
dt.Rows.Add(dr); dr = dt.NewRow();
dr["id"] = "4";
dr["parentid"] = "2";
dr["name"] = "d";
dt.Rows.Add(dr); dr = dt.NewRow();
dr["id"] = "5";
dr["parentid"] = "2";
dr["name"] = "e";
dt.Rows.Add(dr); dr = dt.NewRow();
dr["id"] = "6";
dr["parentid"] = "3";
dr["name"] = "f";
dt.Rows.Add(dr);
return dt;
===========================================
怎么显示出来的结果不对的,那里出问题了??
空格2b
空格空格4d
空格空格5e
空格3c
空格空格6f
结果是:
1a
空格2b
空格4d
空格空格5e
空格空格3c
空格6f
空格2b
空格空格4d
空格空格5e
空格3c
空格空格6f结果是:
1a
空格2b
空格4d
空格空格5e
空格空格3c
空格6f