在C#中的asp.net下拉列表中的select2上设置多个选定值 [英] set multiple selected value on select2 multiple in asp.net dropdownlist from C#

问题描述

我需要在一本书下添加多位作者.因此，我在asp dropdownlist中使用了"Select2 Multiple".我能够插入数据，但是在编辑模式下我无法在下拉列表中分配多个选定的值.

I need to add multiple author under a book. So i have used "Select2 Multiple" in asp dropdownlist. I was able to insert data but in edit mode i can't assign multiple selected value on dropdownlist.

我在aspx页面中的下拉列表是

My dropdownlist in aspx page is

    <asp:DropDownList ID="ddlAuthor" runat="server" multiple="multiple" data-placeholder="Select Author (s)" CssClass="form-control select2"></asp:DropDownList>

在C#中，我尝试了以下操作，但它仅添加了一个值.我的C#代码是

In C# i have tried as following but it add only one value. My c# code is

        foreach (DataRow row in dtAuthor.Rows)
        {
           ddlAuthor.Items.FindByValue(row["AUTHOR_ID"].ToString()).Selected = true;
        }

关于如何在C#中以编辑模式设置多个选定值的任何建议?

Any suggestion about how can i set multiple selected value in edit mode from c#?

推荐答案

您不能使用DropDownList实现此目的，而应使用像这样的listBox:

You can't use a DropDownList to achieve this, use a listBox like this :

    <asp:ListBox ID="ddlAuthor" runat="server" SelectionMode="Multiple" data-placeholder="Select Author (s)" CssClass="form-control select2"></asp:ListBox>

您后面的代码将起作用.

And your code behind will work.

以下是为您提供的代码示例:

Here is a example of code behind for you :

        //I bind my ListBox with random data 
        List<string> data = new List<string>() { "Flo", "Auteur", "Patrick","Test" };
        //Databind
        ddlAuthor.DataSource = data;
        ddlAuthor.DataBind();

        //Here is my selected values, i wish that this values are selected
        List<string> selected = new List<string>() { "Flo", "Patrick" };

        //Foreach value in my selected list i select the proper value in my listbox
        foreach (string row in selected)
        {
            ddlAuthor.Items.FindByValue(row).Selected = true;
        }

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