/// <summary>
        /// 设置能力的当前值
        /// </summary>
        /// <param name="control"></param>
        /// <param name="capInfo"></param>
        private void SetCurrentValue(Control control, CapInfo capInfo)
        {
            if (!control.IsEnabled)
            {
                return;
            }

            bool   twOk;
            string enumStr = null;

            if (control is ComboBox)
            {
                ComboBox comboBox = control as ComboBox;
                //对于压缩算法和文件格式
                if (capInfo.CapId == TwCap.ICAP_COMPRESSION || capInfo.CapId == TwCap.ICAP_IMAGEFILEFORMAT)
                {
                    CapInfo xferCapInfo = twSession.GetScannerCap(TwCap.ICAP_XferMech);
                    if (xferCapInfo.CurrentIntStr == "0") // native模式
                    {
                        // 只设置到控件
                        bool OK = SetCurrentValueOfComboBox(comboBox, capInfo);
                        if (!OK)
                        {
                            comboBox.SelectedIndex = 0;
                            enumStr = (comboBox.SelectedItem as ComboBoxItem).Content.ToString();
                            capInfo.CurrentIntStr = twSession.ConvertEnumStringToIntString(capInfo.CapId, enumStr);
                        }
                        return;
                    }
                }

                // 设置用户保存的设置
                twOk = SetOneValue(comboBox, capInfo);
                if (twOk)
                {
                    return;
                }
                // 获取默认值
                capInfo.CurrentIntStr = capInfo.DefaultIntStr;
                // 设置默认值
                twOk = SetOneValue(comboBox, capInfo);
                if (twOk)
                {
                    return;
                }
                // 设置默认值失败,选择一个值进行设置
                comboBox.SelectedIndex = comboBox.Items.Count / 2;
                string enumString = (comboBox.SelectedItem as ComboBoxItem).Content.ToString();
                string intString  = twSession.ConvertEnumStringToIntString(capInfo.CapId, enumString);
                capInfo.CurrentIntStr = intString;
                twOk = SetOneValue(comboBox, capInfo);
            }
            else if (control is CheckBox)
            {
                CheckBox checkBox = control as CheckBox;
                SetOneValue(checkBox, capInfo);
            }
        }