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将字典<K,V>绑定到DropDownList

drop-down-menu dictionary data-binding asp.net c#

0

Armstrongest · 技术社区 · 15 年前

<asp:DropDownList id="ddl" runat="server" 
        DataValueField="Key" 
        DataTextField="Value.DisplayName" />

代码隐藏

var d = new Dictionary<int, MailAddress>();
d.Add(0,new MailAddress("foo@bar.com", "Mr. Foo");
d.Add(1,new MailAddress("bar@foo.com", "Mr. Bar");

ddl.DataSource = d;
ddl.DataBind(); // Error. It doesn't like "DisplayName"

3 回复 | 直到 15 年前

1

2

Jonathan S. 15 年前

ddl.DataSource = d.Select(r => new KeyValuePair<string, string>(r.Key, r.Value)).ToList();

2

3

Chad Carter 15 年前

看看这篇文章:

http://blogs.msdn.com/b/piyush/archive/2006/10/17/how-to-bind-generic-dictionary-with-dropdown-list.aspx

更改为:

ddl.DataSource = d.Values;

以及:

DataTextField="DisplayName"

它应该做你所期待的。

3

0

ben f. 15 年前

public class MyMailAddress : MailAddress
{

    public MyMailAddress(string emailAddress, string displayName) : base(emailAddress, displayName)
    {

    }
    public override string ToString()
    {
        return base.DisplayName;
    }
}

如果将代码控制到类MailAddress,则可以重写类中的默认ToString()实现,并让它返回DisplayName属性,您只需设置DisplayTextField=“Value”,如下所示:

public class MailAddress
{
    public MailAddress(string emailAddress, string displayName)
    {
        _DisplayName = displayName;
        _EmailAddress = emailAddress;
    }
    public MailAddress()
    {
        _DisplayName = "";
        _EmailAddress = "";
    }

    private string _DisplayName;
    public string DisplayName
    {
        get { return _DisplayName; }
        set { _DisplayName = value; }
    }

    private string _EmailAddress;
    public string EmailAddress
    {
        get { return _EmailAddress; }
        set { _EmailAddress = value; }
    }

    public override string ToString()
    {
        return DisplayName;
    }
}