ASP.NET：列表框的数据源和数据绑定 [英] ASP.NET: Listbox datasource and databind

问题描述

我有一个空的列表框的.aspx页面上

I have an empty listbox on .aspx page

lstbx_confiredLevel1List

我生成两个列表编程

I am generating two lists programatically

List<String> l1ListText = new List<string>(); //holds the text 
List<String> l1ListValue = new List<string>();//holds the value linked to the text

我想加载上面值和文本的.aspx页面上 lstbx_confiredLevel1List 列表框中。所以，我做以下内容：

I want to load lstbx_confiredLevel1List list box on .aspx page with above values and text. So i am doing following:

lstbx_confiredLevel1List.DataSource = l1ListText;
lstbx_confiredLevel1List.DataTextField = l1ListText.ToString();
lstbx_confiredLevel1List.DataValueField = l1ListValue.ToString();
lstbx_confiredLevel1List.DataBind();

但它不会加载 lstbx_confiredLevel1List 与 l1ListText 和 l1ListValue 。

任何想法？

推荐答案

你为什么不使用相同的集合作为数据源？它只是需要具有用于键和值的两个属性。你可以F.E.使用词典＆LT;字符串，字符串＆GT; ：

Why don't you use the same collection as DataSource? It just needs to have two properties for the key and the value. You could f.e. use a Dictionary<string, string>:

var entries = new Dictionary<string, string>();
// fill it here
lstbx_confiredLevel1List.DataSource = entries;
lstbx_confiredLevel1List.DataTextField = "Value";
lstbx_confiredLevel1List.DataValueField = "Key";
lstbx_confiredLevel1List.DataBind();

您也可以使用匿名类型或自定义类。

You can also use an anonymous type or a custom class.

假设你已经这些列表，你需要将它们用作数据源。您可以创建一个词典飞：

Assuming that you have already these lists and you need to use them as DataSource. You could create a Dictionary on the fly:

Dictionary<string, string> dataSource = l1ListText
           .Zip(l1ListValue, (lText, lValue) => new { lText, lValue })
           .ToDictionary(x => x.lValue, x => x.lText);
lstbx_confiredLevel1List.DataSource = dataSource;

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