C# 用toolStripComboBox定义下拉选项来修改richTextBox中的字体大小，就像word那样，运行中出错。

Question

public string[] FontSizeName = { "8", "9", "10", "12", "14", "16", "18", "20", "22", "24", "26", "28", "36", "48", "72", "初号", "小初", "一号", "小一", "二号", "小二", "三号", "小三", "四号", "小四", "五号", "小五", "六号", "小六", "七号", "八号" };
public float[] FontSize = { 8, 9, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 36, 48, 72, 42, 36, 26, 24, 22, 18, 16, 15, 14, 12, 10.5F, 9, 7.5F, 6.5F, 5.5F, 5 };
//定义字号数组
private void toolStripComboBox2_DropDown_1(object sender, EventArgs e)
{
System.Drawing.Text.InstalledFontCollection fonts = new System.Drawing.Text.InstalledFontCollection();
foreach (string name in FontSizeName)
{
this.toolStripComboBox2.Items.Add(name);
}
}
//当下拉菜单时，遍历数组，输出字体型号
private void toolStripComboBox2_SelectedIndexChanged(object sender, EventArgs e)
{
this.richTextBox1.SelectionFont = new Font(this.toolStripComboBox1.Text,FontSize[this.toolStripComboBox2.SelectedIndex], this.richTextBox1.SelectionFont.Style);
}

//通过更改被选定的项来选择字号并修改richTextBox1的字体大小

运行的时候修改几遍字体字号就会出错：

求教各位哥哥姐姐们，该怎么改呢

Answer 1

  给Combox添加Item的时候在初始化时执行一次就OK了，
  如果放在DropDown事件里就会DropDown一次执行一次， 
  改成下面方式没有发现你所描述的问题。
  
       public Form1()
        {
            InitializeComponent();
            System.Drawing.Text.InstalledFontCollection fonts = new System.Drawing.Text.InstalledFontCollection();
            foreach (string name in FontSizeName)
            {
                this.toolStripComboBox2.Items.Add(name);
            }
        }
        public string[] FontSizeName = { "8", "9", "10", "12", "14", "16", "18", "20", "22", "24", "26", "28", "36", "48", "72", "初号", "小初", "一号", "小一", "二号", "小二", "三号", "小三", "四号", "小四", "五号", "小五", "六号", "小六", "七号", "八号" };
        public float[] FontSize = { 8, 9, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 36, 48, 72, 42, 36, 26, 24, 22, 18, 16, 15, 14, 12, 10.5F, 9, 7.5F, 6.5F, 5.5F, 5 };
        //定义字号数组


        private void toolStripComboBox1_DropDown(object sender, EventArgs e)
        {

        }

        private void toolStripComboBox2_DropDown(object sender, EventArgs e)
        {
/*System.Drawing.Text.InstalledFontCollection fonts = new System.Drawing.Text.InstalledFontCollection();
            foreach (string name in FontSizeName)
            {
                this.toolStripComboBox2.Items.Add(name);
            }*/
        }

        private void toolStripComboBox2_SelectedIndexChanged(object sender, EventArgs e)
        {
            this.richTextBox1.SelectionFont = new Font(this.toolStripComboBox1.Text, FontSize[this.toolStripComboBox2.SelectedIndex], this.richTextBox1.SelectionFont.Style);
        }