c# - 获取 comboBox1.SelectedValue

Question

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
    {
        switchItem();
    }
private void switchItem()
        {
            var content = richTextBox1;
            switch (comboBox1.SelectedValue.ToString())
            {
                case "Fruit":
                    content.Text = "Apple";
                    break;
                default:
                    content.Rtf = "Not Selected";
                    break;
            }
        }

如您所见，我正在尝试获取 comboBox1 的 SelectedValue，但出现此 object reference not set to an instance of an object 错误。我该怎么办？

Answer 1

也许您正在寻找 SelectedItem 而不是 SelectedValue

错误 object reference not set to an instance of an object 表示 SelectedValue 为 null