从web.config填充下拉列表值 [英] fill dropdown list value from web.config

问题描述

如果我有几个与所有相关的下拉列表，谁知道要从web.config填写下拉列表值?例如:如果我选择ddlA，则ddlB会给我基于ddlA的值，与ddlC和ddlD相同.

目前，我只知道如何在下面的下拉列表中填充所有内容，但是我准备需要的是:
当用户选择Gre-->我只会在ddl2中显示A，B，C；
当用户选择Phi->时，我只需要在ddl2中显示D，E，F.
希望有人可以给我更多详细的vb步骤

Anyone know to fill dropdown list value from web.config if i have few dropdownlist which all is related? eg: if i select ddlA, then ddlB will give me the value base on ddlA, same as ddlC and ddlD..?

Currently i only know how to fill it all in the dropdownlist as below, but what I ready need is;
when user select Gre -> I will only show A,B,C in the ddl2;
when user select Phi-> I need to show D,E,F in ddl2 only.
Hope someone can give me more detail step in vb

<add key="Value1" value="Gre, Phi" />
    <add key="Value2" value="A,B C,D E,F" />
    <add key="Value3" value="..." />

推荐答案

我不确定为什么要使用网络.config，但是您可以将XML值存储为字符串，然后解析该XML以获取下拉列表值.如果它不是分层式的(如您的帖子所暗示的)，则可以使用CSV，您不能只存储b/c值，而存在一个不确定的数字，它将变得丑陋.就个人而言，我将它们存储在app_data中的文件中并读取，如果您必须从Web服务器上的文件而不是数据库中配置内容(我的首选)

I am not sure why you want to use the web.config but you CAN store an XML value as a string, and pars that XML to get your drop down list values. If it''s not heirarchical ( as your post seems to imply ) then you could use a CSV, you can''t just store values b/c there''s an indeterminate number and it will get ugly. Personally, I''d store them in a file in app_data and read that, instead, if you must configure the content from a file on your web server and not from a database ( my first choice )

您可以使用一组级联的下拉菜单.
这些链接位于C#中，但是您可以尝试将此代码转换为VB.Net-
http://csharpdotnetfreak.blogspot.in/2009/03/populate-dropdown- based-selection-other.html [ ^ ]

You can use a set of cascading dropdowns.
These links are in C#, but you can try and convert this code to VB.Net -
http://csharpdotnetfreak.blogspot.in/2009/03/populate-dropdown-based-selection-other.html[^]

尝试一下.

try this one.

Dim strPwd As String
Dim i As Integer

strPwd = ConfigurationManager.AppSettings("Value1")

Dim arrPwd = Split(strPwd, ", ")

For i = 0 To UBound(arrPwd)
    ddlValue1.items.add(arrPwd(i))
Next

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