如何在CheckedListBox中获取项ID?

时间:2011-02-01 15:15:24

标签: c# .net winforms checkedlistbox

我有一个方法从数据库中提取url名称(varchar),urlID(int)及其Enabled status(bit),并将结果填充到foreach循环上的CheckedListBox。我遇到的问题是checkboxlist似乎只取一个名称及其检查状态。我需要做的是当用户完成对按钮事件的选择时,它会读取CheckedListBox并获取URL ID,并启用状态,以便我可以将其写回数据库。

这是我正在使用的代码:

/// <summary>
/// Create url names in check box list.
/// </summary>
/// <param name="rows"></param>
private void CreateURLCheckBoxes(DataRowCollection rows)
{
    try
    {
        int i = 0;
        foreach (DataRow row in rows)
        {
            //Gets the url name and path when the status is enabled. The status of Enabled / Disabled is setup in the users option page
            string URLName = row["URLName"].ToString();
            int URLID = Convert.ToInt32(row["URLID"]);
            bool enabled = Convert.ToBoolean(row["Enabled"]);

            //Adds the returned to rows to the check box list
            CBLUrls.Items.Add(URLName, enabled);

        }
        i++;
    }

    catch (Exception ex)
    {
        //Log error
        Functionality func = new Functionality();
        func.LogError(ex);

        //Error message the user will see
        string FriendlyError = "There has been populating checkboxes with the urls ";
        Classes.ShowMessageBox.MsgBox(FriendlyError, "There has been an Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
    }
}

3 个答案:

答案 0 :(得分:6)

步骤1:使用ToString()覆盖创建一个类来保存Name和Id,该覆盖返回Name

public class UrlInfo
{
    public string Name;
    public int Id;
    public bool Enabled;

    public override string ToString()
    {
        return this.Name;
    }
}

步骤2:将此类的实例添加到CheckedListBox

 UrlInfo u1 = new UrlInfo { Name = "test 1", Id = 1, Enabled = false };
 UrlInfo u2 = new UrlInfo { Name = "test 2", Id = 2, Enabled = true };
 UrlInfo u3 = new UrlInfo { Name = "test 3", Id = 3, Enabled = false };

 checkedListBox1.Items.Add(u1, u1.Enabled);
 checkedListBox1.Items.Add(u2, u2.Enabled);
 checkedListBox1.Items.Add(u3, u3.Enabled);

第3步:将SelectedItem强制转换为UrlInfo并检索.Id

private void checkedListBox1_ItemCheck(object sender, ItemCheckEventArgs e)
{
    UrlInfo urlInfo = checkedListBox1.Items[e.Index] as UrlInfo;
    if (null != urlInfo)
    {
        urlInfo.Enabled = e.NewValue == CheckState.Checked;
        Console.WriteLine("The item's ID is " + urlInfo.Id);
    }
}

答案 1 :(得分:1)

您最好创建一个包含string(您的网址)和int(ID)的简单类,覆盖ToString()方法以返回网址,然后添加对象Items的{​​{1}}属性。 获得所选对象后,只需将其强制转换为新类,即可访问这两个属性。

类似的东西:

CheckedListBox

然后当你添加对象时:

public class MyClass
{
    public string Url { get; set; }
    public int Id { get; set; }
    public override string  ToString()
    {
         return this.Url;
    }
}

答案 2 :(得分:0)

此控件具有Value Member和Display成员。如果您使用Name作为显示成员并将ID用作值成员,我认为您可以执行所需的操作。