c# - 如何在组合框的 DrawItem 事件中获取 DisplayMember 值？ C#

Question

请考虑以下事项:

我使用以下方法填充我的组合框:

void populateComboBox()
{
    comboBox1.DataSource = GetDataTableSource(); // some data table used as source
    comboBox1.DisplayMember = "name";            // string
    comboBox1.ValueMember = "id";                // id is an int

    // Suppose I have this data in my comboBox after populating it
    // 
    //
    // id (ValueMember) | name (DisplayMember)
    // -----------------------------------------
    //  1       | name1
    //  2       | name2
    //  3       | name3
}

在 DrawItem 事件中，我想获取组合框的 DisplayMember(名称)的值并将其分配给某个变量。到目前为止，我得到了这段代码，但它似乎不起作用……请更正它。提前致谢....

void comboBox1_DrawItem(object sender, DrawItemEventArgs e)
{
    string name = ((System.Data.DataRowView)(comboBox1.SelectedValue = e.Index))["name"].ToString();

    // do something
    //  
}

Answer 1

好的，我自己刚遇到这个问题，这里有一个更好的答案:

string displayValue = this.GetItemText(this.Items[e.Index]);             
g.DrawString(displayValue, e.Font, br, e.Bounds.Left, y + 1);

根据 MSDN:

If the DisplayMember property is not specified, the value returned by GetItemText is the value of the item's ToString method. Otherwise, the method returns the string value of the member specified in the DisplayMember property for the object specified in the item parameter

http://msdn.microsoft.com/en-us/library/system.windows.forms.listcontrol.getitemtext(v=vs.80).aspx