在c# WinApp中,我如何同时添加文本和值到我的组合框的项目? 我做了一个搜索,通常答案是使用“绑定到一个源”..但在我的情况下,我没有一个绑定源准备在我的程序… 我怎么做这样的事情:

combo1.Item[1] = "DisplayText";
combo1.Item[1].Value = "useful Value"

当前回答

你可以像这样使用匿名类:

comboBox.DisplayMember = "Text";
comboBox.ValueMember = "Value";

comboBox.Items.Add(new { Text = "report A", Value = "reportA" });
comboBox.Items.Add(new { Text = "report B", Value = "reportB" });
comboBox.Items.Add(new { Text = "report C", Value = "reportC" });
comboBox.Items.Add(new { Text = "report D", Value = "reportD" });
comboBox.Items.Add(new { Text = "report E", Value = "reportE" });

更新:虽然上面的代码将正确显示在组合框中,你将不能使用组合框的SelectedValue或SelectedText属性。为了能够使用这些,绑定组合框如下:

comboBox.DisplayMember = "Text";
comboBox.ValueMember = "Value";

var items = new[] { 
    new { Text = "report A", Value = "reportA" }, 
    new { Text = "report B", Value = "reportB" }, 
    new { Text = "report C", Value = "reportC" },
    new { Text = "report D", Value = "reportD" },
    new { Text = "report E", Value = "reportE" }
};

comboBox.DataSource = items;

其他回答

除了Adam Markowitz的回答之外,这里还有一种通用的方法(相对来说)简单地将组合框的ItemSource值设置为枚举,同时向用户显示“Description”属性。(您可能认为每个人都想这样做,这样它就会成为。net的一行程序,但事实并非如此,而且这是我发现的最优雅的方式)。

首先,创建这个简单的类,用于将任意Enum值转换为ComboBox项:

public class ComboEnumItem {
    public string Text { get; set; }
    public object Value { get; set; }

    public ComboEnumItem(Enum originalEnum)
    {
        this.Value = originalEnum;
        this.Text = this.ToString();
    }

    public string ToString()
    {
        FieldInfo field = Value.GetType().GetField(Value.ToString());
        DescriptionAttribute attribute = Attribute.GetCustomAttribute(field, typeof(DescriptionAttribute)) as DescriptionAttribute;
        return attribute == null ? Value.ToString() : attribute.Description;
    }
}

其次,在OnLoad事件处理程序中,您需要将组合框的源设置为基于枚举类型中的每个Enum的ComboEnumItems列表。这可以用Linq实现。然后设置DisplayMemberPath:

    void OnLoad(object sender, RoutedEventArgs e)
    {
        comboBoxUserReadable.ItemsSource = Enum.GetValues(typeof(EMyEnum))
                        .Cast<EMyEnum>()
                        .Select(v => new ComboEnumItem(v))
                        .ToList();

        comboBoxUserReadable.DisplayMemberPath = "Text";
        comboBoxUserReadable.SelectedValuePath= "Value";
    }

现在用户将从用户友好的描述列表中进行选择,但他们选择的将是您可以在代码中使用的枚举值。 要在代码中访问用户的选择,comboBoxUserReadable。SelectedItem将是ComboEnumItem和comboBoxUserReadable。SelectedValue将是EMyEnum。

一个使用DataTable的例子:

DataTable dtblDataSource = new DataTable();
dtblDataSource.Columns.Add("DisplayMember");
dtblDataSource.Columns.Add("ValueMember");
dtblDataSource.Columns.Add("AdditionalInfo");

dtblDataSource.Rows.Add("Item 1", 1, "something useful 1");
dtblDataSource.Rows.Add("Item 2", 2, "something useful 2");
dtblDataSource.Rows.Add("Item 3", 3, "something useful 3");

combo1.Items.Clear();
combo1.DataSource = dtblDataSource;
combo1.DisplayMember = "DisplayMember";
combo1.ValueMember = "ValueMember";

   //Get additional info
   foreach (DataRowView drv in combo1.Items)
   {
         string strAdditionalInfo = drv["AdditionalInfo"].ToString();
   }

   //Get additional info for selected item
    string strAdditionalInfo = (combo1.SelectedItem as DataRowView)["AdditionalInfo"].ToString();

   //Get selected value
   string strSelectedValue = combo1.SelectedValue.ToString();
using (SqlConnection con = new SqlConnection(insertClass.dbPath))
{
    con.Open();
    using (SqlDataAdapter sda = new SqlDataAdapter(
    "SELECT CategoryID, Category FROM Category WHERE Status='Active' ", con))
    {
        //Fill the DataTable with records from Table.
        DataTable dt = new DataTable();
        sda.Fill(dt);
        //Insert the Default Item to DataTable.
        DataRow row = dt.NewRow();
        row[0] = 0;
        row[1] = "(Selecione)";
        dt.Rows.InsertAt(row, 0);
        //Assign DataTable as DataSource.
        cboProductTypeName.DataSource = dt;
        cboProductTypeName.DisplayMember = "Category";
        cboProductTypeName.ValueMember = "CategoryID";
    }
}             
con.Close();

这里有更好的解决方案;

Dictionary<int, string> userListDictionary = new Dictionary<int, string>();
        foreach (var user in users)
        {
            userListDictionary.Add(user.Id,user.Name);
        }

        cmbUser.DataSource = new BindingSource(userListDictionary, null);
        cmbUser.DisplayMember = "Value";
        cmbUser.ValueMember = "Key";

检索数据

MessageBox.Show(cmbUser.SelectedValue.ToString());

你可以像这样使用匿名类:

comboBox.DisplayMember = "Text";
comboBox.ValueMember = "Value";

comboBox.Items.Add(new { Text = "report A", Value = "reportA" });
comboBox.Items.Add(new { Text = "report B", Value = "reportB" });
comboBox.Items.Add(new { Text = "report C", Value = "reportC" });
comboBox.Items.Add(new { Text = "report D", Value = "reportD" });
comboBox.Items.Add(new { Text = "report E", Value = "reportE" });

更新:虽然上面的代码将正确显示在组合框中,你将不能使用组合框的SelectedValue或SelectedText属性。为了能够使用这些,绑定组合框如下:

comboBox.DisplayMember = "Text";
comboBox.ValueMember = "Value";

var items = new[] { 
    new { Text = "report A", Value = "reportA" }, 
    new { Text = "report B", Value = "reportB" }, 
    new { Text = "report C", Value = "reportC" },
    new { Text = "report D", Value = "reportD" },
    new { Text = "report E", Value = "reportE" }
};

comboBox.DataSource = items;