public WebHost.WebHost Host
{
get
{
if(_host == null)
{
_host = WebHost.WebHost.Create();
}
return _host;
}
}
在WinForm程序中嵌入ASP.NET http://www.blogcn.com/user8/flier_lu/index.html?id=1125444&run=.002A442 现在的流行趋势是桌面程序Web化,Web程序桌面化,呵呵。最终目标就是你中有我,我中有你。例如MSN Explorer就是一个很好的展示,让用户在使用的时候分不清什么时候是在本地什么时候是在网络。而这类程序往往需要有一个后台服务器如IIS的支持,这对大多数桌面应用来说too heavy了。本着简单就是美的设计思想,这里给出一个轻量级的解决方法,把ASP.NET嵌入到普通WinForm桌面程序中去。 因为安全以及其它一些方面的原因,在使用ASP.NET引擎之前,必须建立一个新的AppDomain。简单的方法是直接使用ApplicationHost.CreateApplicationHost函数为指定的虚拟目录和物理路径建立ASP.NET引擎宿主的实例,如 // should create a subdirectory ./bin and copy the assembly to it static public WebHost Create(string name, string path) { if(!name.StartsWith(new string(Path.AltDirectorySeparatorChar, 1))) { name = Path.AltDirectorySeparatorChar + name; } WebHost host = (WebHost)ApplicationHost.CreateApplicationHost( typeof(WebHost), name, path); host.setVirtualDirectory(name); host.setBaseDirectory(path); return host; } 但这样建立的程序有个BT的要求,他会在指定目录的bin子目录中去尝试载入宿主类型(WebHost)的assembly,也就是说你必须把程序在bin子目录下复制一份,非常不爽。解决方法是自己手工完成整个建立过程,如下:
static public WebHost Create(string virtualDir, string physicalDir) { if(!virtualDir.StartsWith(new string(Path.AltDirectorySeparatorChar, 1))) { virtualDir = Path.AltDirectorySeparatorChar + virtualDir; } if(!physicalDir.EndsWith(new string(Path.DirectorySeparatorChar, 1))) { physicalDir += Path.DirectorySeparatorChar; } AppDomainSetup setup = new AppDomainSetup(); setup.ApplicationName = "APP_" + Guid.NewGuid().ToString(); setup.ConfigurationFile = "web.config"; AppDomain domain = AppDomain.CreateDomain("ASPHOST_" + Guid.NewGuid().ToString(), null, setup); domain.SetData(".appDomain", "*"); domain.SetData(".appPath", physicalDir); domain.SetData(".appVPath", virtualDir); domain.SetData(".domainId", domain.FriendlyName); domain.SetData(".hostingVirtualPath", virtualDir); domain.SetData(".hostingInstallDir", HttpRuntime.AspInstallDirectory); WebHost host = (WebHost)domain.CreateInstanceAndUnwrap( typeof(WebHost).Module.Assembly.FullName, typeof(WebHost).FullName); host.setApplicationDomain(domain); host.setVirtualDirectory(virtualDir); host.setBaseDirectory(physicalDir); return host; } 这儿的一堆domain.SetData是传递参数给ASP.NET引擎。然后在那个appdomain中建立新的宿主类型的实例。这样就避免多份代码的尴尬。而使用ASP.NET就比较简单了,在宿主类中使用HttpRuntime.ProcessRequest函数处理特定请求。简单一点的话,可以直接用SimpleWorkerRequest包装请求,生成页面到一个指定的TextWriter中,如 private void DoRequest(string page, string query, TextWriter writer) { HttpRuntime.ProcessRequest(new SimpleWorkerRequest(page, query, writer)); } public void RequestPage(string page, string query, Stream stream) { DoRequest(page, query, new StreamWriter(stream)); } public void RequestPage(string page, Stream stream) { RequestPage(page, null, stream); } public string RequestPage(string page, string query) { using(StringWriter writer = new StringWriter()) { DoRequest(page, query, writer); return writer.ToString(); } } public string RequestPage(string page) { return RequestPage(page, string.Empty); } 这个缺省的请求包装使用是简单,但对中文的兼容性不太好,过两天有空再自己写个强一点的吧,呵呵 最终类的使用就比较简单了,在WinForm程序中建立一个singleton模式的属性 然后请求指定的asp.net页面,如
HTML = Host.RequestPage(_page);
即可完成从动态的asp.net脚本到静态html的转换。嵌入WinForm程序中,还可以通过Host类型完成两者之间的双向通讯,实现互相控制。下次有空继续,呵呵 参考资料: 2.Executing ASMX files without a web server 3.ASP. NET Client-side Hosting with Cassini 4.Using ASP.NET Runtime in Desktop Applications | |
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using System;
using System.IO;
using System.Text;
using System.Web;
using System.Web.Hosting;
using System.Runtime.Remoting;
namespace Navigator.WebHost
{
/// <summary>
/// Summary description for WebHost.
/// </summary>
public class WebHost : MarshalByRefObject
{
#if false
// should create a subdirectory ./bin and copy the assembly to it
static public WebHost Create(string name, string path)
{
if(!name.StartsWith(new string(Path.AltDirectorySeparatorChar, 1)))
{
name = Path.AltDirectorySeparatorChar + name;
}
WebHost host = (WebHost)ApplicationHost.CreateApplicationHost(
typeof(WebHost), name, path);
host.setVirtualDirectory(name);
host.setBaseDirectory(path);
return host;
}
#else
static public WebHost Create(string virtualDir, string physicalDir)
{
if(!virtualDir.StartsWith(new string(Path.AltDirectorySeparatorChar, 1)))
{
virtualDir = Path.AltDirectorySeparatorChar + virtualDir;
}
if(!physicalDir.EndsWith(new string(Path.DirectorySeparatorChar, 1)))
{
physicalDir += Path.DirectorySeparatorChar;
}
AppDomainSetup setup = new AppDomainSetup();
setup.ApplicationName = "APP_" + Guid.NewGuid().ToString();
setup.ConfigurationFile = "web.config";
AppDomain domain = AppDomain.CreateDomain("ASPHOST_" + Guid.NewGuid().ToString(), null, setup);
domain.SetData(".appDomain", "*";
domain.SetData(".appPath", physicalDir);
domain.SetData(".appVPath", virtualDir);
domain.SetData(".domainId", domain.FriendlyName);
domain.SetData(".hostingVirtualPath", virtualDir);
domain.SetData(".hostingInstallDir", HttpRuntime.AspInstallDirectory);
WebHost host = (WebHost)domain.CreateInstanceAndUnwrap(
typeof(WebHost).Module.Assembly.FullName, typeof(WebHost).FullName);
host.setApplicationDomain(domain);
host.setVirtualDirectory(virtualDir);
host.setBaseDirectory(physicalDir);
return host;
}
#endif
static public WebHost Create(string name)
{
return Create(name, Environment.CurrentDirectory);
}
static public WebHost Create()
{
return Create(string.Empty, Environment.CurrentDirectory);
}
private AppDomain _appDomain = null;
private string _virtualDir;
private string _baseDir;
protected void setApplicationDomain(AppDomain domain)
{
_appDomain = domain;
}
protected void setVirtualDirectory(string dir)
{
_virtualDir = dir;
}
protected void setBaseDirectory(string dir)
{
_baseDir = dir;
}
public AppDomain ApplicationDomain
{
get
{
return _appDomain;
}
}
public string VirtualDirectory
{
get
{
return _virtualDir;
}
}
public string BaseDirectory
{
get
{
return _baseDir;
}
}
private void DoRequest(string page, string query, TextWriter writer)
{
HttpRuntime.ProcessRequest(new SimpleWorkerRequest(page, query, writer));
}
public void RequestPage(string page, string query, Stream stream)
{
DoRequest(page, query, new StreamWriter(stream));
}
public void RequestPage(string page, Stream stream)
{
RequestPage(page, null, stream);
}
public string RequestPage(string page, string query)
{
using(StringWriter writer = new StringWriter())
{
DoRequest(page, query, writer);
return writer.ToString();
}
}
public string RequestPage(string page)
{
return RequestPage(page, string.Empty);
}
}
}