将下拉列表绑定到SQLDataSource

我在努力将下拉列表绑定到数据源。请参阅下面的代码：将下拉列表绑定到SQLDataSource

Private _ConString As String 

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load 
     _ConString = ConfigurationManager.ConnectionStrings("GeniedbConnection").ConnectionString 
     SqlDataSourceNicheDuplicates.ConnectionString = _ConString 
     SqlDataSourceCreatedDate.ConnectionString = _ConString 
     SqlDataSourceCreatedDate.SelectCommand = "SELECT dateadded distinct convert(varchar,dateadded,103) as dateadded dbNicheDuplicates" 
     DDLCreatedDate.DataTextField = "dateadded" 
     DDLCreatedDate.DataValueField = "dateadded" 
     DDLCreatedDate.DataBind() 
end sub

如果我在SQL Studio Manager中运行SQL语句，那么会返回许多结果。我究竟做错了什么？

我花了一些时间用谷歌搜索这个。例如，我看着这个问题：Populating an ASP.Net DropDownList using VB.Net coding in code-behind file

来源

2014-11-03 w0051977

只需将更多的信息添加到lincolnk's的答案。您需要这样做 - DDLCreatedDate.DataSource = SqlDataSourceCreatedDate;

SqlDataSourceCreatedDate.SelectCommand = "SELECT dateadded distinct convert(varchar,dateadded,103) as dateadded dbNicheDuplicates" 
DDLCreatedDate.DataSource = SqlDataSourceCreatedDate; 
DDLCreatedDate.DataTextField = "dateadded" 
DDLCreatedDate.DataValueField = "dateadded" 
DDLCreatedDate.DataBind()

来源

2014-11-03 17:42:56

谢谢，但下拉列表仍然是空的。 – w0051977 2014-11-03 18:01:34

@ w0051977，你确定这个SQL'SELECT dateadded distinct convert（varchar，dateadded，103）as dateadded dbNicheDuplicates'正在管理控制台中工作吗？ – 2014-11-03 18:03:00

对不起，我的错。有两个表格：dbNicheDuplicates和dbo.dbNicheDuplicate。 dbo.dbNicheDuplicate没有数据。 – w0051977 2014-11-03 18:12:21

您未设置DataSource。

DDLCreatedDate.DataSource = <results> 
DDLCreatedDate.DataBind()

你没有列出你的工作对象的类型，所以我不确定缺少的语句到底是什么。

来源

2014-11-03 17:31:02 lincolnk

什么是：？ – w0051977 2014-11-03 17:40:48

将下拉列表绑定到SQLDataSource

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