第530篇--MVVM Code Generator

在用Prism框架开发WPF/Silverlight程序的时候，经常会要手写View对应的ViewModel代码，但是很多情况下，ViewModel的代码结构相差不会很大，一般是有Property, Constructor, Command以及一些事件，所以为了提高开发效率，本文和大家探讨用一个小工具实现ViewModel的快速开发。

基本思路

主要流程就是解析XAML代码，首先把所有有Binding的语句段抽出来。

方法：GetAllCommandPropertiesNames

  /// <summary>
        /// 获取所有Command名字 Command="{Binding OpenFileCommand}" 或是Command="{Binding Path=SaveFileCommand}"
        /// </summary>
        /// <param name="xaml"></param>
        /// <returns></returns>
        private  static List<string> GetAllCommandPropertiesNames(string xaml)
        {
            List<string> commandPropertiesNames = new List<string>();
            foreach (int position in StringHelper.GetPositions(xaml, PropertyConst))
            {
                int endPosition = StringHelper.GetNearestPositionOnStart(xaml, position + PropertyConst.Length, CloseChar);
                // 得到有可能的字符串如：Path=**Command 或是Path =***Command, 去除= 空格 Path 
                // 过滤掉这种Binding情况：
                // CommandParameter="{Binding Path=., RelativeSource={RelativeSource AncestorType={x:Type TabControl}}}"
                string result = xaml.Substring(position + PropertyConst.Length, endPosition - position - PropertyConst.Length).Replace(" ", string.Empty).Replace(PathConst, string.Empty).Replace("=", string.Empty);
                if (!result.Contains(RelativeBindingPath))
                {
                    commandPropertiesNames.Add(result);
                }
            }
            return commandPropertiesNames.Distinct().ToList();
        }

抽出所有的bound属性：GetAllBindingPropertiesNames

   /// <summary>
        /// 获取所有属性名字 Text="{Binding Age}", Text="{Binding Path=Name}"
        /// </summary>
        /// <param name="xaml"></param>
        /// <returns></returns>
        private static List<string> GetAllBindingPropertiesNames(string xaml)
        {
            List<string> bindingProperties = GetAllCommandPropertiesNames(xaml);
            if (bindingProperties != null && bindingProperties.Count > 0)
            {
                return bindingProperties.Where(com => com.IndexOf("Command") < 0).ToList();
            }
            return null;
        }

抽取所有的bound Command: GetAllCommandNames

/// <summary>
        /// 获取所有Command名字 Command="{Binding OpenFileCommand}" 或是Command="{Binding Path=SaveFileCommand}"
        /// </summary>
        /// <param name="xaml"></param>
        /// <returns></returns>
        private static List<string> GetAllCommandNames(string xaml)
        {
            List<string> commands=GetAllCommandPropertiesNames(xaml);
            if (commands != null && commands.Count>0)
            {
                return commands.Where(com => com.IndexOf("Command") > 0).ToList();
            }
            return null;
        }

Demo代码下载：https://skydrive.live.com/#cid=6B286CBEF1610557&id=6B286CBEF1610557!692