Auto-width of ComboBox's content
Auto-width of ComboBox's content
回答1
You can't use it directly.
Do a trick
First iterate through all items of your combobox, check for the width of every items by assigning the text to a label. Then, check width every time, if width of current item gets greater than previous items then change the maximum width.
int DropDownWidth(ComboBox myCombo)
{
int maxWidth = 0;
int temp = 0;
Label label1 = new Label();
foreach (var obj in myCombo.Items)
{
label1.Text = obj.ToString();
temp = label1.PreferredWidth;
if (temp > maxWidth)
{
maxWidth = temp;
}
}
label1.Dispose();
return maxWidth;
}
private void Form1_Load(object sender, EventArgs e)
{
comboBox1.DropDownWidth = DropDownWidth(comboBox1);
}
OR
As suggested by stakx, you can use TextRenderer
class
int DropDownWidth(ComboBox myCombo)
{
int maxWidth = 0, temp = 0;
foreach (var obj in myCombo.Items)
{
temp = TextRenderer.MeasureText(obj.ToString(), myCombo.Font).Width;
if (temp > maxWidth)
{
maxWidth = temp;
}
}
return maxWidth;
}
回答2
obj.ToString() doesn't work for me, I suggest to use myCombo.GetItemText(obj). This works for me:
private int DropDownWidth(ComboBox myCombo)
{
int maxWidth = 0, temp = 0;
foreach (var obj in myCombo.Items)
{
temp = TextRenderer.MeasureText(myCombo.GetItemText(obj), myCombo.Font).Width;
if (temp > maxWidth)
{
maxWidth = temp;
}
}
return maxWidth + SystemInformation.VerticalScrollBarWidth;
}
自己处理的,综合上面两个
private void SetComboBoxWidth(ComboBox comboBox)
{
int maxWidth = 260;
foreach (var obj in comboBox.Items)
{
var temp = TextRenderer.MeasureText(comboBox.GetItemText(obj), comboBox.Font).Width;
if (temp > maxWidth)
{
maxWidth = temp;
}
}
comboBox.Width = maxWidth + SystemInformation.VerticalScrollBarWidth;
}