Reflective Learning Series 3-reflection instance Application

Example this thing is actually very difficult to make, get a simple, although can explain the problem but it is easy to let people feel no practical value, get a practical value but often involve many other technology even involve a lot of business logic, it seems very complex difficult to understand. Here I try to pursue a few examples that have practical value and are not complicated.

1. Use reflection to dynamically create objects of related classes by reading a configuration file

Let's take a look at the main function and the situation where the object that needs to be loaded dynamically is in the same assembly

Structure Chart:

Interface

interface ILog
　　{
　　　　bool Write(string message);
　　　　bool Write(Exception ex);
　　}

Textfilelog

class TextFileLog : ILog
　　{
　　　　public bool Write(string message)
　　　　{
　　　　　　string fileDir = ConfigurationManager.AppSettings["LogTarget"].ToString();
　　　　　　using (StreamWriter w = File.AppendText(fileDir))
　　　　　　{
　　　　　　　　// w.Write(" Log Entry : ");
　　　　　　　　w.WriteLine("发生时间{0}", DateTime.Now.ToLocalTime().ToString());
　　　　　　　　w.WriteLine("日志内容为:{0}", message);
　　　　　　　　w.WriteLine("-------------------------------");
　　　　　　　　// Update the underlying file.
　　　　　　　　w.Flush();
　　　　　　　　w.Close();
　　　　　　}
　　　　　　return true;
　　　　}
　　　　public bool Write(Exception ex)
　　　　{

　　　　　　Write(ex.Message);
　　　　　　return true;
　　　　}
　　}