[轉貼] WinForm解決ComboBox在下拉選單Width的AutoSize

出處：http://www.dotblogs.com.tw/puma/archive/2008/08/20/4955.aspx

小弟最近在寫WinForm,遇到ComboBox下拉選單時

如果下拉選項文字太長會被切掉的問題..如下圖所示:

去找了一下解決方法...分享給大家呀...

c#(WinForm)

private void Form1_Load(object sender, EventArgs e)
{

    comboBox1.Items.Add("微軟Tech．Ed 2008研討會");
    comboBox1.Items.Add("MIX08 Taipei");

    //ComboBox AutoSize
    int maxSize = 0;
    System.Drawing.Graphics g = CreateGraphics();

    for (int i = 0; i < comboBox1.Items.Count; i++)
    {
        comboBox1.SelectedIndex = i;
        SizeF size = g.MeasureString(comboBox1.Text, comboBox1.Font);
        if (maxSize < (int)size.Width)
        {
            maxSize = (int)size.Width;
        }
    }

    comboBox1.DropDownWidth = comboBox1.Width;

    if (comboBox1.DropDownWidth < maxSize)
    {
        comboBox1.DropDownWidth = maxSize;
    }

    comboBox1.SelectedIndex = -1;

}

執行結果:

 

參考網址:

http://paltman.com/2007/04/03/autosize-and-the-combobox/