如何选择一个DropDownList的所有记录 [英] How to select all records in a DropDownList

问题描述

我有这样的DropDownList：

I have this DropDownList:

<asp:DropDownList ID="DropDownList1" 
    runat="server" 
    AutoPostBack="true" 
    DataSourceID="SqlDataSource1" 
    DataTextField="Categorie" 
    DataValueField="Cat_ID" 
>
</asp:DropDownList>

和在SqlDataSource 选择[tbl_Cat] *所有

and the SqlDataSource select * all from [tbl_Cat]

它用于通过类别进行过滤数据库。它完美地工作，但只显示了三个类别都在 tbl_Cat 。我也希望有一个选择在DropDownList所有项。

It's used to filter the database via category. It works perfectly, but it only shows the three categories that are in the tbl_Cat. I also want a select all item in the DropDownList.

DropDownList控件和数据网格不与code-背后作出的;是否有可能通过进入选择所有记录选项，code-后面？

The DropDownList and the datagrid are not made with code-behind; is it possible to enter a "select all records" option through code-behind?

推荐答案

您需要编写低于code，帮助您选择类别的所有选项。

You need to write the below code which help you to select all option for category.

 <asp:DropDownList ID="DropDownList1" AutoPostBack="true" runat="server">
 </asp:DropDownList>

在$后面的文件c $ C

In Code behind file

SqlConnection con = new SqlConnection(str);
string com = "select * all from tbl_Cat";
SqlDataAdapter adpt = new SqlDataAdapter(com, con);
DataTable dt = new DataTable();
adpt.Fill(dt);

DropDownList1.DataSource = dt;
DropDownList1.DataBind();
DropDownList1.DataTextField = "Categorie";
DropDownList1.DataValueField = "Cat_ID";
DropDownList1.DataBind();
DropDownList1.Items.Insert(0, new ListItem("Select ALL", "0"));

现在，你可以检查是否下拉选择的值是0，如果是0，那么你可以在电网负荷中的所有记录。

Now you can check if drop down selected value is 0, if it is 0 then you can load all the records in the grid.

让我知道，如果任何事情，我错过了。

Let me know if any thing i miss.

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