Asp.net MVC中的Http管道事件为什么要以Application_开头(原因解析)

public class MvcApplication : System.Web.HttpApplication
{
.....
}

internal class HttpApplicationFactory{
  internal const string applicationFileName = "global.asax"; //看到这里，就知道为什么入口文件是global.asax了，因为这里定义死了
  ...
  private void EnsureInited() {
      if (!_inited) {
          lock (this) {
              if (!_inited) {
                  Init();
                  _inited = true;
              }
          }
      }
  }
  private void Init() {
      if (_customApplication != null)
          return;
      try {
          try {
              _appFilename = GetApplicationFile();
              CompileApplication();
          }
          finally {
              // Always set up global.asax file change notification, even if compilation
              // failed.  This way, if the problem is fixed, the appdomain will be restarted.
              SetupChangesMonitor();
          }
      }
      catch { // Protect against exception filters
          throw;
      }
  }
  private void CompileApplication() {
    // Get the Application Type and AppState from the global file
    _theApplicationType = BuildManager.GetGlobalAsaxType();
    BuildResultCompiledGlobalAsaxType result = BuildManager.GetGlobalAsaxBuildResult();
    if (result != null) {
        // Even if global.asax was already compiled, we need to get the collections
        // of application and session objects, since they are not persisted when
        // global.asax is compiled.  Ideally, they would be, but since