动态WebService方法
调用Webservice的方法一般是通过右击项目--》添加服务引用--》输入Webservice地址--》前往--》确定,这样可以顺利调用服,但是需要注意的一点是:如果上面的方法是在非启动项项目(比如某个类库)中添加的,在该项目下会自动生成一个app.config文件,而在主配置文件web.config中并没有自动添加上该webservice的标记,这样运行会出现错误,说找不到配置信息等等……所有还需要把app.config中的<system.serviceModel>……</system.serviceModel>这段配置添加到web.config的<configuration>……</configuration>标记中,这样运行就不会出问题了。如果以后服务地址发生了变化,也只需要修改web.config中的地址就行了。
如果你觉得上面的方法含麻烦的话,你可以选择下面的方法:动态WebService方法。需要写一个底层解析Webservice服务地址的方法,然后调用就可以,很方便。服务地址你可以配置到web.config中,也可以保存到数据库中,随你了……
下面通过一个判断腾讯QQ在线状态的例子说明一下动态WebService的方法。
腾讯QQ在线状态WEB 服务:http://webservice.webxml.com.cn/webservices/qqOnlineWebService.asmx
方法:qqCheckOnline 获得腾讯QQ在线状态
输入参数:QQ号码 String,默认QQ号码:8698053。返回数据:String,Y = 在线;N = 离线;E = QQ号码错误;A = 商业用户验证失败;V = 免费用户超过数量
using System; using System.Collections; using System.Reflection; using System.Web.Services; using System.Web.Services.Protocols; using System.Web.Services.Description; using System.CodeDom; using System.CodeDom.Compiler; using System.Net; using System.Web; namespace Kayang.WebService { /// <summary> /// WebServiceProxy 的摘要说明。 /// </summary> public sealed class WebServiceProxy { private static Hashtable _assenblyCache = null; //缓存提高效率 public WebServiceProxy() { } //url:服务地址 //methodname:方法名字 //args:方法的参数 public static object InvokeWebservice(string url, string nsClassName, string methodname, params object[] args) { return InvokeWebservice(url, nsClassName, methodname, 100000, args); } public static object InvokeWebservice(string url, string nsClassName, string methodname, int timeout, params object[] args) { if (args.Length == 1 && args[0] is ArrayList) { args = (args[0] as ArrayList).ToArray(); } try { int li = nsClassName.LastIndexOf(‘.‘); string @namespace = (li == -1 ? "" : nsClassName.Substring(0, li)); Assembly assembly; if (_assenblyCache == null) { _assenblyCache = new Hashtable(); } if (_assenblyCache.ContainsKey(url.ToUpper())) { assembly = (Assembly)_assenblyCache[url.ToUpper()]; } else { System.Net.WebClient wc = new System.Net.WebClient(); System.IO.Stream stream = wc.OpenRead(url + "?WSDL"); //Configuration.SoapEnvelopeProcessingElement se = new Configuration.SoapEnvelopeProcessingElement(); //se.ReadTimeout = 15000; ServiceDescription sd = ServiceDescription.Read(stream); ServiceDescriptionImporter sdi = new ServiceDescriptionImporter(); sdi.AddServiceDescription(sd, "", ""); CodeNamespace cn = new CodeNamespace(@namespace); CodeCompileUnit ccu = new CodeCompileUnit(); ccu.Namespaces.Add(cn); sdi.Import(cn, ccu); Microsoft.CSharp.CSharpCodeProvider csc = new Microsoft.CSharp.CSharpCodeProvider(); ICodeCompiler icc = csc.CreateCompiler(); CompilerParameters cplist = new CompilerParameters(); cplist.GenerateExecutable = false; cplist.GenerateInMemory = true; cplist.ReferencedAssemblies.Add("System.dll"); cplist.ReferencedAssemblies.Add("System.XML.dll"); cplist.ReferencedAssemblies.Add("System.Web.Services.dll"); cplist.ReferencedAssemblies.Add("System.Data.dll"); CompilerResults cr = icc.CompileAssemblyFromDom(cplist, ccu); if (true == cr.Errors.HasErrors) { System.Text.StringBuilder sb = new System.Text.StringBuilder(); foreach (CompilerError ce in cr.Errors) { sb.Append(ce.ToString()); sb.Append(System.Environment.NewLine); } throw new Exception(sb.ToString()); } assembly = cr.CompiledAssembly; _assenblyCache[url.ToUpper()] = assembly; } Type t = null; if (String.IsNullOrEmpty(nsClassName)) { t = assembly.GetTypes()[0]; } else { t = assembly.GetType(nsClassName, true, true); } MethodInfo mi = null; if (String.IsNullOrEmpty(methodname)) { mi = t.GetMethods(BindingFlags.DeclaredOnly | BindingFlags.Public | BindingFlags.Instance)[0]; } else { mi = t.GetMethod(methodname); } SoapHttpClientProtocol obj = Activator.CreateInstance(t) as SoapHttpClientProtocol; SetCookie(url, obj); //obj.Credentials = System.Net.CredentialCache.DefaultNetworkCredentials; obj.Timeout = timeout; return mi.Invoke(obj, args); } catch (Exception ex) { throw new Exception(ex.InnerException.Message, new Exception(ex.InnerException.StackTrace)); } } /// <summary> /// 传入Cookie,使对方可以使用当前Session /// By 黄正 2009-12-6 /// </summary> /// <param name="url"></param> /// <param name="obj"></param> private static void SetCookie(string url, SoapHttpClientProtocol obj) { HttpContext ctx = HttpContext.Current; if (ctx != null) { CookieContainer cc = new CookieContainer(); foreach (string cookieName in ctx.Request.Cookies.AllKeys) { cc.SetCookies(new Uri(url), cookieName + "=" + ctx.Request.Cookies[cookieName].Value); } //req.Headers.Add(HttpRequestHeader.Cookie, Request.Headers["Cookie"]); obj.CookieContainer = cc; } } } }
调用:
string url = "http://webservice.webxml.com.cn/webservices/qqOnlineWebService.asmx"; string @namespace=""; string methodname = "qqCheckOnline";//需要调用的webservice中的方法 string Invoke = "123456";//QQ号码 string result = WebService.WebServiceProxy.InvokeWebservice(url, @namespace, methodname, Invoke).ToString();
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