《模式——工程化实现及扩展》（设计模式C# 版）《重新研读C#语言》——“自我检验" 参考答案：配置访问部分

 

转自：《模式——工程化实现及扩展》（设计模式C# 版）

http://www.cnblogs.com/callwangxiang/

 

 

1、请用.NET Framework内置的配置类解析如下格式的配置文件

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <configSections>
    <section name="singleLine" type="？？？"/>
    <section name="dictionary" type="？？？"/>
  </configSections>
  
  <singleLine name="first" age="second" level="third"/>
  <dictionary>
    <add key="name" value="first"/>
    <add key="age" value="second"/>
    <add key="level" value="third"/>
  </dictionary>
  
</configuration>

 

 

参考答案

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <configSections>
    <section name="singleLine" type="System.Configuration.SingleTagSectionHandler"/>
    <section name="dictionary" type="System.Configuration.DictionarySectionHandler"/>
  </configSections>
  <singleLine name="first" age="second" level="third"/>
  <dictionary>
    <add key="name" value="first"/>
    <add key="age" value="second"/>
    <add key="level" value="third"/>
  </dictionary>
</configuration>

 

单元测试验证

 

        [TestMethod]
        public void TestReadSingleTagConfigurationSection()
        {
            var section = ConfigurationManager.GetSection("singleLine") as Hashtable;
            Assert.AreEqual("first", section["name"]);
            Assert.AreEqual("second", section["age"]);
            Assert.AreEqual("third", section["level"]);
        }

        [TestMethod]
        public void TestReadDictionaryConfigurationSection()
        {
            var section = ConfigurationManager.GetSection("dictionary") as Hashtable;
            Assert.AreEqual("first", section["name"]);
            Assert.AreEqual("second", section["age"]);
            Assert.AreEqual("third", section["level"]);
        }

 

2、 由于项目组很多成员以前来自Java开发背景，一般喜欢自定义独立的.XML配置文件，请通过LINQ编写一个读取下列XML定义的配置文件类型

<?xml version="1.0" encoding="utf-8" ?>
<config>
  <!--集合配置项-->
  <users>
    <user name="11" age="12" level="13"/>
    <user name="21" age="22" level="23"/>
    <user name="31" age="32" level="33"/>
  </users>
  <!--单元素配置项-->
  <runtime name="1" age="2" level="3"/>
</config>

 

 

 

参考答案

 

为了便于访问配置内容，定义两个实体类型User和Runtime，按照”自我检验“ 的要求采用LINQ to XML方式完成示例如下：

using System;
using System.Collections;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;
using System.Xml.Linq;
using Microsoft.VisualStudio.TestTools.UnitTesting;
namespace MarvellousWorks.PracticalPattern.Concept.Tests.Exercise
{
    [TestClass]
    public class ConfigurationExerciseFixture
    {
        class User
        {
            public string Name { get; set;}
            public int Age { get; set; }
            public string Level{ get; set;}

            public override bool Equals(object obj)
            {
                var user = (User) obj;
                return string.Equals(user.Name, Name) && string.Equals(user.Level, Level) && (user.Age == Age);
            }
        }

        class Runtime : User{}

        class ExerciseConfigurationManager
        {
            const string FileName = "ExerciseConfig.xml";
            const string UsersItem = "users";
            const string UserItem = "user";
            const string RuntimeItem = "runtime";
            const string NameItem = "name";
            const string AgeItem = "age";
            const string LevelItem = "level";

            public IEnumerable<User> Users
            {
                get
                {
                    return
                        from item in XElement.Load(FileName).Element(UsersItem).Elements(UserItem)
                        select new User()
                                   {
                                       Name = item.Attribute(NameItem).Value,
                                       Age = Convert.ToInt32(item.Attribute(AgeItem).Value),
                                       Level = item.Attribute(LevelItem).Value
                                   };
                }
            }

            public Runtime Runtime
            {
                get
                {
                    var element = XElement.Load(FileName).Element(RuntimeItem);
                    return new Runtime()
                                     {
                                         Name = element.Attribute(NameItem).Value,
                                         Age = Convert.ToInt32(element.Attribute(AgeItem).Value),
                                         Level = element.Attribute(LevelItem).Value
                                     };
                }
            }

        }

        /// <summary>
        //<?xml version="1.0" encoding="utf-8" ?>
        //<config>
        //  <!--集合配置项-->
        //  <users>
        //    <user name="11" age="12" level="13"/>
        //    <user name="21" age="22" level="23"/>
        //    <user name="31" age="32" level="33"/>
        //  </users>
        //  <!--单元素配置项-->
        //  <runtime name="1" age="2" level="3"/>
        //</config>
        /// </summary>
        [TestMethod]
        public void TestLoadConfigurationWithXLinq()
        {
            var config = new ExerciseConfigurationManager();
            var users = config.Users.ToArray();
            Assert.IsNotNull(users);
            Assert.AreEqual<int>(3, users.Count());
            Assert.AreEqual<User>(users[1], new User() {Name = "21", Age = 22, Level = "23"});

            var runtime = config.Runtime;
            Assert.IsNotNull(runtime);
            Assert.AreEqual<Runtime>(runtime, new Runtime(){Name="1", Age=2, Level = "3"});
        }
    }
}