上一篇讲了从创建应用程序域到创建ISAPIRuntime实例的过程，本篇继续讲Asp.net处理第一次请求的必要的初始化过程。
ISAPIRuntime分析
ISAPIRuntime在System.Web.Hosting中实现，它的ProcessRequest是我们处理web请求的入口。
public int ProcessRequest(IntPtr ecb, int iWRType) {
IntPtr pHttpCompletion = IntPtr.Zero; if (iWRType == WORKER_REQUEST_TYPE_IN_PROC_VERSION_2) {
pHttpCompletion = ecb;
ecb = UnsafeNativeMethods.GetEcb(pHttpCompletion);
}
ISAPIWorkerRequest wr = null; try { bool useOOP = (iWRType == WORKER_REQUEST_TYPE_OOP);
wr = ISAPIWorkerRequest.CreateWorkerRequest(ecb, useOOP);
wr.Initialize();
String wrPath = wr.GetAppPathTranslated();
String adPath = HttpRuntime.AppDomainAppPathInternal;
if (adPath == null ||StringUtil.EqualsIgnoreCase(wrPath, adPath)) {
