它似乎使用 Windows 设置中的默认颜色,默认情况下为蓝色。 假设我想将其永久更改为红色。我正在使用 Winforms。
提前致谢。
Drawitem
事件并将 DrawMode
属性设置为 DrawMode.OwnerDrawFixed
检查此示例:
private void listBox1_DrawItem(object sender, DrawItemEventArgs e)
{
if (e.Index < 0) return;
// If the item is selected them change the back color.
if ((e.State & DrawItemState.Selected) == DrawItemState.Selected)
e = new DrawItemEventArgs(e.Graphics,
e.Font,
e.Bounds,
e.Index,
e.State ^ DrawItemState.Selected,
e.ForeColor,
Color.Yellow); // Choose the color.
// Draw the background of the ListBox control for each item.
e.DrawBackground();
// Draw the current item text
e.Graphics.DrawString(listBox1.Items[e.Index].ToString(),e.Font, Brushes.Black, e.Bounds, StringFormat.GenericDefault);
// If the ListBox has focus, draw a focus rectangle around the selected item.
e.DrawFocusRectangle();
}
希望这对将来的人有帮助,因为上面的代码对我有帮助,但不是 100%
我仍然遇到以下问题:
- 当我选择另一个索引时,新选择的索引也会突出显示红色。
- 当我更改列表框的字体大小时,突出显示的区域会太小。
下面解决了这个问题
private void lstCartOutput_MeasureItem(object sender, MeasureItemEventArgs e)
{
// Cast the sender object back to ListBox type.
ListBox listBox = (ListBox)sender;
e.ItemHeight = listBox.Font.Height;
}
private void lstCartOutput_DrawItem(object sender, DrawItemEventArgs e)
{
ListBox listBox = (ListBox)sender;
e.DrawBackground();
Brush myBrush = Brushes.Black;
if ((e.State & DrawItemState.Selected) == DrawItemState.Selected)
{
myBrush = Brushes.Red;
e.Graphics.FillRectangle(new SolidBrush(Color.FromArgb(0, 64, 64)), e.Bounds);
}
else
{
e.Graphics.FillRectangle(Brushes.White, e.Bounds);
}
e.Graphics.DrawString(listBox.Items[e.Index].ToString(),e.Font, myBrush, e.Bounds);
e.DrawFocusRectangle();
}
我还参考了 MSDN 网站。
下面的代码完全符合您的意思:
在InitializeComponent方法中:
this.listBox1.DrawMode = DrawMode.OwnerDrawFixed;
this.listBox1.DrawItem += new System.Windows.Forms.DrawItemEventHandler(listBox1_DrawItem);
this.listBox1.SelectedIndexChanged += new System.EventHandler(listBox1_SelectedIndexChanged);
以及事件处理程序:
void listBox1_SelectedIndexChanged(object sender, System.EventArgs e)
{
this.listBox1.Invalidate();
}
void listBox1_DrawItem(object sender, System.Windows.Forms.DrawItemEventArgs e)
{
int index = e.Index;
Graphics g = e.Graphics;
foreach (int selectedIndex in this.listBox1.SelectedIndices)
{
if (index == selectedIndex)
{
// Draw the new background colour
e.DrawBackground();
g.FillRectangle(new SolidBrush(Color.Red), e.Bounds);
}
}
// Get the item details
Font font = listBox1.Font;
Color colour = listBox1.ForeColor;
string text = listBox1.Items[index].ToString();
// Print the text
g.DrawString(text, font, new SolidBrush(Color.Black), (float)e.Bounds.X, (float)e.Bounds.Y);
e.DrawFocusRectangle();
}
代码取自:
http://www.weask.us/entry/change-listbox-rsquo-selected-item-backcolor-net
为什么首先使用 ListBox,而不是将其替换为完全可自定义的单列、无标题可见、只读 DataGridView?
我也有同样的问题。
不幸的是我的数据源是实体类列表。因此,我具有与上面接受的答案相同的代码,但进行了少量修改,以选择我的 ListBox 在 DrawString 上所需的类上的确切属性:
if (e.Index < 0) return;
if ((e.State & DrawItemState.Selected) == DrawItemState.Selected)
e = new DrawItemEventArgs(e.Graphics,
e.Font,
e.Bounds,
e.Index,
e.State ^ DrawItemState.Selected,
e.ForeColor,
Color.Yellow);
e.DrawBackground();
//This is my modification below:
e.Graphics.DrawString(ctListViewProcess.Items.Cast<entMyEntity>().Select(c => c.strPropertyName).ElementAt(e.Index), e.Font, Brushes.Black, e.Bounds, StringFormat.GenericDefault);
e.DrawFocusRectangle();