RadioButtonList绑定数据源问题

Question

RadioButtonList 4个选项 ：好，中上，中，差。 数据库里有 一个字段，字段值为 上面 4个。如何 读取数据 让相应的选项被选中? 修改相应选项，点击保存，如何 将修改的值 修改到数据库？

Answer 1

 For i = 0 To 9
            rd1.Items.Add(i)
  Next
  rd1.Text = "2"简单来说可以这样，

Answer 2

你绑定的Value值也是用同个字段来绑定的吗？如果是的话
RadioButtonList1.SelectedValue = 读取出来的值;
不是的话读取Value绑定的值赋给SelectedValue;修改保存到数据库，先读取出来在修改
        RadioButtonList1.SelectedItem.Text//Text值
        RadioButtonList1.SelectedValue//Value值

Answer 3

直接用下面的这种判断：
      if (dt.Rows[0]["UserSelect"].ToString() == "好")
                        {
                            rbtl_Status.SelectedIndex = 0;
                        }
else  if (dt.Rows[0]["UserSelect"].ToString() == "中上")
                        {
                            rbtl_Status.SelectedIndex = 1;
                        }
else  if (dt.Rows[0]["UserSelect"].ToString() == "中")
                        {
                            rbtl_Status.SelectedIndex = 2;
                        }
                        else
                        {
                            rbtl_Status.SelectedIndex = 3;
                        }
修改数据库：
string UserSelect= rbtl_Status.SelectedItem.Text;
string mySQL="Update Table1 set UserSelect='"+UserSelect+"' where ID="+ServiceID;

Answer 4

<asp:gridview ID="GridView2"><asp:TemplateField HeaderText="单元状态">
                    <itemtemplate>
                        <asp:RadioButtonList ID="rbtnlist1" runat="server" RepeatDirection="Horizontal">
                            <asp:ListItem value="好" text="好" />
                            <asp:ListItem value="中上" text="中上" />
                            <asp:ListItem value="中" text="中" />
                            <asp:ListItem value="差" text="差" />
                        </asp:RadioButtonList>
                    </itemtemplate>
                    <itemstyle width="150px" />
                </asp:TemplateField></gridview>
后台代码：
             DataTable t = GetDataTable();
            GridView2.DataSource = t;
            GridView2.DataBind();
 RadioButtonList rbt = this.GridView2.FindControl("rbtnlist1") as RadioButtonList;
            for (int i = 1; i <= t.Rows.Count; i++)
            {
                if (t.Rows[i]["DYZT"].ToString() == "好")
                {
                    rbt.SelectedIndex = 0;
                }
                else if (t.Rows[i]["DYZT"].ToString() == "中上")
                {
                    rbt.SelectedIndex = 1;
                }
                else if (t.Rows[i]["DYZT"].ToString() == "中")
                {
                    rbt.SelectedIndex = 2;
                }
                else
                {
                    rbt.SelectedIndex = 3;
                }
            }
“rbt.SelectedIndex = 0;
”未将对象引用设置到对象的实例。

Answer 5

yanlele424  来 帮我看看  是怎么回事

Answer 6

  <asp:RadioButtonList ID="RadioButtonList1" runat="server">
        <asp:ListItem Text="好" Value="1"></asp:ListItem>
        <asp:ListItem Text="中上" Value="2"></asp:ListItem>
        <asp:ListItem Text="中" Value="3"></asp:ListItem>
        <asp:ListItem Text="差" Value="4"></asp:ListItem>
    </asp:RadioButtonList>protected void Page_Load(object sender, EventArgs e)
    {
        this.RadioButtonList1.SelectedValue = "2";
        //2可从数据库中读取。
    }

Answer 7

 <asp:RadioButtonList ID="rbtnlist1" runat="server" RepeatDirection="Horizontal">
                            <asp:ListItem value="好" text="好" />
                            <asp:ListItem value="中上" text="中上" />
                            <asp:ListItem value="中" text="中" />
                            <asp:ListItem value="差" text="差" />
                        </asp:RadioButtonList>我数据库中存放的的就是 好，中上，中，差 四个之中的一个，
RadioButtonList rbt = this.GridView2.FindControl("rbtnlist1") as RadioButtonList;
            
            for (int i = 0; i <= t.Rows.Count;i++)
            {
                string item = t.Rows[i]["DYZT"].ToString();
                if (rbt.Items[i].Text == item)
                {
                    rbt.Items[i].Selected = true;
                }
            }
(t 是数据源)为什么 到 if判断的时候  rbt 是个空？

Answer 8

在 protected void gvProjectText_RowDataBound(object sender, GridViewRowEventArgs e)事件中{
    RadioButtonList rbt = e.Row.FindControl(“rbtnlist1") as RadioButtonList
    }

Answer 9

rbt 好像 依然 是个空啊... ...

Answer 10

RadioButtonList rbt = this.GridView2.FindControl("rbtnlist1") as RadioButtonList;
如果这个找不到 就不是下面代码的问题了
你先找Gridview里绑定RadioButtonList 的代码
然后再
this.RadioButtonList1.SelectedValue =取的值

Answer 11

  
    protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
  {
        RadioButtonList rbl = e.Row.FindControl("RadioButtonList2") as RadioButtonList;
         rbl .RadioButtonList1.SelectedValue = 数据库中读取的值；;
    }

Answer 12

在 protected void gvProjectText_RowDataBound(object sender, GridViewRowEventArgs e)事件中{
     if (e.Row.RowType == DataControlRowType.DataRow)
        {
         RadioButtonList rbt = e.Row.FindControl(“rbtnlist1") as RadioButtonList;
         }
}

Answer 13

后台通过RadioButtonList.SelectValue来设置和获取单选框中选中的值(value)

Answer 14

是运行完 那一句   得出的 结果是 rbt是null  所以后面的就没办法了。用这个if (e.Row.RowType == DataControlRowType.DataRow) 判断 后的结果 是flase...  悲催啊

Answer 15

在后台 怎么绑定他的 radio啊  给点代码吧... ...   我快要疯了

Answer 16

<asp:TemplateField HeaderText="单元状态">
                    <itemtemplate>
                        <asp:RadioButtonList ID="rbtnlist1" runat="server" RepeatDirection="Horizontal">
                            <asp:ListItem value="好" text="好" width="50"/>
                            <asp:ListItem value="中上" text="中上" width="50"/>
                            <asp:ListItem value="中" text="中" width="50"/>
                            <asp:ListItem value="下" text="下" width="50"/>
                        </asp:RadioButtonList>
                    </itemtemplate>
                    <itemstyle width="150px" />
                </asp:TemplateField>protected void GridView2_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            RadioButtonList rbt = e.Row.FindControl("rbtnlist1") as RadioButtonList;
        } 为什么 rbt 是空？？？ 谁能帮忙解决一下啊  我快要疯了