Question

下拉列表动态绑定为：

<asp:DropDownList ID="ddlSource" class="ddl" runat="server" DataSourceID="FROM1" DataTextField="CompanyName" DataValueField="CompanyName">
                </asp:DropDownList>
                <asp:SqlDataSource ID="FROM1" runat="server" ConnectionString="<%$ ConnectionStrings:PIMSConnectionString2 %>" SelectCommand="SELECT [CompanyName] FROM Company ORDER BY [CompanyName]"></asp:SqlDataSource>
                <br />

CompanyName表的值等于＆＃34;选择＆＃34;我希望此值显示在下拉列表中，但应该显示为灰色（禁用），以便用户无法选择或设置它。

任何想法如何在ASP.NET（而不是HTML）中做到这一点？

Answer 1

试试这个，但填充ddlSource将来自代码（它在vb.net中，对不起）：

     Public Sub PopDDL()
        FORM1.SelectCommand = "SELECT CompanyName FROM Company ORDER BY CompanyName;"
        ddlSource.DataSourceID = "FORM1"
        ddlSource.DataTextField = "CompanyName"
        ddlSource.DataValueField = "CompanyName"
        ddlSource.DataBind()
        For Each itm As ListItem In ddlSource.Items
            If itm.Value = *your_condition* Then  'condition why this item must be disabled
                itm.Attributes.Add("disabled", "disabled")
            End If
        Next
    End Sub

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        PopDDL()
    End Sub

项目将显示但已禁用（灰色）。

更新：我使用转换工具（vb.net到c＃），我认为这是c＃代码：

foreach (ListItem itm in ddlSource.Items) {
    if (itm.Value == *your_contidion*) { 'condition why this item must be disabled
        itm.Attributes.Add("disabled", "disabled");
    }
}

如果您使用itm.Enabled = False，则不会显示该项目。

UPDATE＃2（通过在线转换器转换为c＃代码）：

aspx页面：

    <asp:DropDownList ID="ddlSource" class="ddl" runat="server" > </asp:DropDownList>
   <asp:SqlDataSource ID="FROM1" runat="server" ConnectionString="<%$ ConnectionStrings:PIMSConnectionString2 %>" SelectCommand=""></asp:SqlDataSource>
   <br />

代码背后的代码：

public void PopDDL()
{
    FORM1.SelectCommand = "SELECT CompanyName FROM Company ORDER BY CompanyName;";
    ddlSource.DataSourceID = "FORM1";
    ddlSource.DataTextField = "CompanyName";
    ddlSource.DataValueField = "CompanyName";
    ddlSource.DataBind();
    foreach (ListItem itm in ddlSource.Items) {
        if (itm.Value == *your_condition*) {
            itm.Attributes.Add("disabled", "disabled");
        }
    }
}

protected void Page_Load(object sender, System.EventArgs e)
{
    PopDDL();
}

Answer 2

基于评论中的其他问题，有完整的答案。

禁用:%s/this_one/that_one/g并根据条件ListItems将其置于ddlSource的顶部：

aspx：

CompanyName="Select"

代码背后的代码：

<asp:DropDownList ID="ddlSource" class="ddl" runat="server" > </asp:DropDownList>
<asp:SqlDataSource ID="FROM1" runat="server" ConnectionString="<%$ ConnectionStrings:PIMSConnectionString2 %>" SelectCommand=""></asp:SqlDataSource>
<br />

如何动态绑定下拉列表时禁用下拉列表项

2 个答案: