gridview 将下拉列表绑定到 List<keyvaluePair<int, string>> [英] gridview bind dropdownlist to List<keyvaluePair<int, string>>
问题描述
我的数据库中有许多表保存对键值对的引用:
I have a number of tables in my DB that hold references to an key value pair:
电话号码类型:
- 1 - 主页
- 2 - 工作
- 3 - 移动
- 4 - 传真
等
所以我有一个类型表，当它们在其他表中使用时，它们引用 int 值作为外键.当我将它们拉出时，我一直将它们作为 keyvaluepair 项目存储在使用它们的类中.
So I have a table for the types and when they are used in other tables they reference the int value as a foreign key. When I have been pulling them out I have been storing them as keyvaluepair<int, string> items in the class that is using them.
当我需要获取它们的列表时，我想我只需创建它们的 List<> 而不是使用两种不同类型的数据类型来获取相同的数据.
When I needed to get a list of them I thought I would just create a List<> of them rather than use two different types of data types to get the same data.
当我使用 edittemplate 位时需要在 gridview 中填充下拉列表时，我的问题就出现了.如果我使用数据源将其提取出来，它将在文本中写入 [1 Home]，而不是将 int 作为值，将 Home 作为要显示的文本.
My problem has arrived when I need to populate a dropdownlist within a gridview when I am using the edittemplate bit. If I use a datasource to pull this out it will write [1 Home] in the text rather than put the int as the value and Home as the text to display.
我想我真的有一个多部分的问题.
I guess I have a multiple part question really.
一:
我傻吗?这是将数据取出并存储(键值对部分)的一种非常糟糕的方式吗?我应该将它全部存储在数据表中吗?我不喜欢把它全部放在数据表中.我将我的 DAL 带到我的 BLL 并尝试将所有内容封装为对象或 List<> 的对象而不是所有内容的表格.大多数情况下，这都运行良好.
Am I being stupid? Is this a really bad way to get the data out and store it (the keyvaluepair part)? Should I just be storing it all in a datatable? I didn't like to put it all in datatable. I have my DAL taking to my BLL and have tried to encapsulate everything as objects or List<>'s of objects rather than tables of everything. Most the time this has worked well.
二:
如果我使用某个对象而不是数据表绑定到下拉列表的对象数据源中，我该如何设置当前选定的值，而不是只选择列表中的第一项?
If I was using some object rather than a datatable to bind into my objectdatasource for the dropdownlist, how can I set the currently selected value, rather than have it just have the first item in the list selected?
编辑
正如下面所指出的，我是个白痴，只需要设置 DataValueField 和 DataKeyField.
As was pointed out below I was being an idiot and just needed to set the DataValueField and DataKeyField.
要绑定下拉列表，我只需要做:
To get the dropdownlist to bind I just had to do:
SelectedValue='<%# DataBinder.Eval(Container, "DataItem.PhoneType.Key") %>'
我没有立即看到它的原因是它没有出现在我的智能感知中，但是当我手动输入它时，它起作用了.
The reason I didn't see that one straight away was because it was not showing up in my intellisense but when I manually typed it in, it worked.
推荐答案
使用字典
Use a Dictionary<int, string> and set your DropDown DataValueField to Key and DataTextField to Value.
// A sample dictionary:
var dictionary = new Dictionary<int, string>();
dictionary.Add(1, "Home");
dictionary.Add(2, "Work");
dictionary.Add(3, "Mobile");
dictionary.Add(4, "Fax");
// Binding the dictionary to the DropDownList:
dropDown.DataTextField = "Value";
dropDown.DataValueField = "Key";
dropDown.DataSource = dictionary; //Dictionary<int, string>
dropDown.DataBind();
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