如何设置数据绑定后，选定值 [英] How to set selected value after data bind

问题描述

我无法弄清楚如何我所选择的值数据绑定后设置。我存储在一个临时变量的值，然后绑定后再设置它，但它不工作。

code背后

 保护无效InsertButton_Click（对象发件人，EventArgs的发送）
{
    VAR CTRL =（控制）发送;
    VAR LVL =（ListViewItem的）ctrl.NamingContainer;
    VAR formSectionListBox =（列表框）lvl.FindControl（formsection）;
    变种临时= formSectionListBox.SelectedValue;    //更新的ListView
    ListView1.DataSource = SqlDataSource1;
    ListView1.DataBind（）;
    formSectionListBox.Items.FindByValue（临时）.Selected = TRUE;
}
 

ASP.net

 ＆LT; ASP：ListView控件ID =ListView1的=服务器InsertItemPosition =与firstItemOnPagePropertiesChanged =ListView1_PagePropertiesChangedOnItemEditing =ListView1_OnItemEditing的DataKeyNames =FormTitleOnSelectedIndexChanged = ListView1_SelectedIndexChangedOnItemCanceling =ListView1_OnItemCancelingOnItemUpdating =ListView1_ItemUpdatingOnItemInserting =ListView1_ItemInsertingOnItemDeleting =ListView1_ItemDeleting＆GT;
    ＆LT;＆InsertTemplate则GT;
        ＆所述; TR＆GT;
            ＆所述; TD＆GT;                ＆LT; ASP：按钮的ID =InsertButton=服务器的CommandName =插入文本=插入的OnClick =InsertButton_Click/＆GT;
                ＆LT; ASP：按钮的ID =CancelButton=服务器的CommandName =取消文本=清除的CausesValidation =FALSE/＆GT;            ＆LT; / TD＆GT;
            ＆所述; TD＆GT;
                ＆LT; D​​IV的风格=高度：汽车;宽度：250像素;溢出：汽车;边界：固体;边框颜色：ActiveBorder＆GT;
                    ＆LT; ASP：列表框ID =formsection=服务器的DataSourceID =FormSectionDataSourceDataTextField =FormSectionDataValueField =FormSectionIDAppendDataBoundItems =真的SelectedValue ='＆LT;％＃绑定（FormSectionID）％＆GT ;' HEIGHT =150像素＆GT;
                        ＆LT; ASP：ListItem的值=＆GT;＆LT;  - 请选择 - ＆GT;＆LT; / ASP：ListItem的＆GT;
                   ＆LT; / ASP：列表框＆GT;                ＆LT; / DIV＆GT;
            ＆LT; / TD＆GT;
        ＆LT; / TR＆GT;
     ＆LT; / InsertTemplate则＆GT;
＆LT; / ASP：的ListView＆GT;
 

解决方案

做

  formSectionListBox.SelectedItem =温度;
 

您也可以使用SelectedValue属性由温度值来设置。无论是一个人应该工作，虽然。

编辑：既然你的情况气温是该项目的价值。我会用

  formSectionListBox.SelectedValue =温度;
 

在一般情况下，请记住，很多这些属性都get和set，而不仅仅是获取：）

I cannot figure out how to set my selected value after the databind. I store the value in a temp variable and then set it again after the binding but it is not working.

Code Behind

protected void InsertButton_Click(object sender, EventArgs e)
{
    var ctrl = (Control)sender;
    var lvl = (ListViewItem)ctrl.NamingContainer;
    var formSectionListBox = (ListBox)lvl.FindControl("formsection");
    var temp = formSectionListBox.SelectedValue;

    // Update ListView
    ListView1.DataSource = SqlDataSource1;                   
    ListView1.DataBind();
    formSectionListBox.Items.FindByValue(temp).Selected = true;
}

ASP.net

 <asp:ListView ID="ListView1" runat="server" InsertItemPosition="FirstItem" OnPagePropertiesChanged="ListView1_PagePropertiesChanged" OnItemEditing="ListView1_OnItemEditing" DataKeyNames="FormTitle" OnSelectedIndexChanged="ListView1_SelectedIndexChanged" OnItemCanceling="ListView1_OnItemCanceling" OnItemUpdating="ListView1_ItemUpdating" OnItemInserting="ListView1_ItemInserting" OnItemDeleting="ListView1_ItemDeleting">
    <InsertItemTemplate>
        <tr>
            <td>

                <asp:Button ID="InsertButton" runat="server" CommandName="Insert" Text="Insert" OnClick="InsertButton_Click" />
                <asp:Button ID="CancelButton" runat="server" CommandName="Cancel" Text="Clear" CausesValidation="False" />

            </td>
            <td>
                <div style="height: auto; width: 250px; overflow: auto; border: solid; border-color: ActiveBorder">
                    <asp:ListBox ID="formsection" runat="server" DataSourceID="FormSectionDataSource" DataTextField="FormSection" DataValueField="FormSectionID" AppendDataBoundItems="True" SelectedValue='<%# Bind("FormSectionID") %>' Height="150px">
                        <asp:ListItem Value=""><- please select -></asp:ListItem>
                   </asp:ListBox>

                </div>
            </td>
        </tr>
     </InsertItemTemplate>
</asp:ListView>

解决方案

do

formSectionListBox.SelectedItem = temp;

you can also use the SelectedValue property to set it by the value of temp. Either one should work though.

EDIT: since in your case temp was the value of the item. I would use the

formSectionListBox.SelectedValue = temp;

In general, remember that a lot of these properties are both Get AND Set, not just Get :)

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