winforms 如何在组合框中使用字典隐藏UI输出中的方括号？

zbsbpyhn 于 2023-02-13 发布在其他

关注(0)|答案(2)|浏览(84)

我试图隐藏UI输出中的方括号。

我认为这是一个很容易的变通办法，但我想不出来。
我的代码添加项目到组合框：

conn_mode.DataSource = new Dictionary<string, string>()
{
    {"1", "WiFi"},
    {"2", "GSM"},
    {"3", "Offline"},
}.ToList();
conn_mode.ValueMember = "Key";
conn_mode.DisplayMember = "Value";

我使用这段代码将组合框中的项目居中对齐：

private void cur_mul_DrawItem(object sender, DrawItemEventArgs e)
{       
    ComboBox cbx = sender as ComboBox;
    if (cbx != null)
    {
    // Always draw the background
    e.DrawBackground();

    // Drawing one of the items?
    if (e.Index >= 0)
    {
        // Set the string alignment.  Choices are Center, Near and Far
        StringFormat sf = new StringFormat();
        sf.LineAlignment = StringAlignment.Center;
        sf.Alignment = StringAlignment.Center;

        // Set the Brush to ComboBox ForeColor to maintain any ComboBox color settings
        // Assumes Brush is solid
        Brush brush = new SolidBrush(cbx.ForeColor);

        // If drawing highlighted selection, change brush
        if ((e.State & DrawItemState.Selected) == DrawItemState.Selected)
            brush = SystemBrushes.HighlightText;

        // Draw the string
        e.Graphics.DrawString(cbx.Items[e.Index].ToString(), cbx.Font, brush, e.Bounds, sf);
    }
}

winforms

来源：https://stackoverflow.com/questions/75395237/how-to-hide-square-brackets-in-my-ui-output-using-dictionary-in-combobox

2条答案

按热度按时间

xpszyzbs1#

无论如何填充ComboBox，始终调用GetItemText方法来获取item的文本。

var cbx = sender as ComboBox;
var itemText = cbx.GetItemText(cbx.Items[e.Index]);

e.Graphics.DrawString(itemText, ...);

如果需要显示ValueMember + DisplayMember这样的格式化字符串，此处的数据源是Dictionary<string, string>，则这些项是KeyValuePair<string, string>类型的集合。因此：

var cbx = sender as ComboBox;
var item = (KeyValuePair<string, string>)cbx.Items[e.Index];
var itemText = $"{item.Key}, {item.Value}";

e.Graphics.DrawString(itemText, ...);

否则，当您传递cbx.Items[e.Index].ToString()时，您将得到.ToString()方法覆盖为KeyValuePair<TKey, TValue>类型返回的内容。

旁注

必须释放sf和brush示例，或使用using语句创建它们。

var cbx = sender as ComboBox;
var item = (KeyValuePair<string, string>)cbx.Items[e.Index];
var itemText = $"{item.Key}, {item.Value}";
var foreColor = cbx.ForeColor;

if ((e.State & DrawItemState.Selected) == DrawItemState.Selected)
    foreColor = SystemColors.HighlightText;

using (var brush = new SolidBrush(foreColor))
using (var sf = new StringFormat(StringFormat.GenericTypographic))
{
    sf.Alignment = sf.LineAlignment = StringAlignment.Center;
    e.Graphics.DrawString(itemText, cbx.Font, brush, e.Bounds, sf);
}

请改用TextRenderer在控件上绘制文本。

var cbx = sender as ComboBox;
var item = (KeyValuePair<string, string>)cbx.Items[e.Index];
var itemText = $"{item.Key}, {item.Value}";
var foreColor = cbx.ForeColor;

if ((e.State & DrawItemState.Selected) == DrawItemState.Selected)
    foreColor = SystemColors.HighlightText;

TextRenderer.DrawText(e.Graphics, itemText, cbx.Font, e.Bounds, foreColor, 
    TextFormatFlags.HorizontalCenter | TextFormatFlags.VerticalCenter);

赞(0）回复(0）举报 2023-02-13

ig9co6j12#

在组合框中添加字典值

conn_mode.DataSource = new Dictionary<string, string>()
{
    {"1", "WiFi"},
    {"2", "GSM"},
    {"3", "Offline"},
}.ToList();
conn_mode.ValueMember = "Key";
conn_mode.DisplayMember = "Value";

enter image description here
使用下面的代码在添加到组合框中时删除方括号。

Conn_Mode.DataSource = new Dictionary<string, string>()
                    {
                        {"1", "WiFi"},
                        {"2", "GSM"},
                        {"3", "Offline"},
                    }.Select(d => d.Key + "," + d.Value).ToList();

enter image description here

赞(0）回复(0）举报 2023-02-13

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winforms 如何在组合框中使用字典隐藏UI输出中的方括号？

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