我的WebAPI控制器发生了一个奇怪的问题。
在我的开发环境（Win7，IIS 7.5）中，调用控制器上的方法，并按预期返回结果。
在我的集成环境（WIn Server 2003，IIS 6.0）中，我通过将代码从开发框复制到集成框来部署代码。调用控制器上的方法并返回以下错误：
“没有MediaTypeFormatter可用于读取”EmailQueueResult“类型的对象 来自媒体类型为“text / html”的内容。“
我不明白为什么我只在集成环境中而不是在我的开发环境中出现此错误。
public HttpResponseMessage Post([FromBody]EmailQueueMessage email)
{
EmailQueueResult result;
if (email != null)
{
try
{
var emailQueueIdList = QueueEmails(email);
QueueAttachments(email, emailQueueIdList);
foreach(var emailQueueId in emailQueueIdList)
{
UpdateEmailQueueDateQueued(emailQueueId, DateTime.Now);
}
result = new EmailQueueResult(0, "Email added to queue.", "", null);
}
catch (Exception e) {
result = new EmailQueueResult(2, "Error occurred.", e.Message, null);
}
}
else
{
result = new EmailQueueResult(1, "Email passed in was null.", "", null);
}
return ControllerContext.Request.CreateResponse(HttpStatusCode.OK, result, "application/json");
}
WebApiConfig.cs：
namespace App_Start
{
public static class WebApiConfig
{
public static void Register(HttpConfiguration config)
{
config.Routes.MapHttpRoute(
"ControllerWithBooleanParameter",
"api/{controller}/{showSentEmails}",
null,
new { boolConstraint = new IsBoolean() }
);
config.Routes.MapHttpRoute(
"ControllerWithIntegerParameter",
"api/{controller}/{id}",
null,
new { id = @"^\d+$" }
);
config.Routes.MapHttpRoute(
"Default",
"api/{controller}/{id}",
new { id = UrlParameter.Optional }
);
}
}
}
的Web.config：
<?xml version="1.0" encoding="utf-8"?>
<!--
For more information on how to configure your ASP.NET application, please visit
http://go.microsoft.com/fwlink/?LinkId=169433
-->
<configuration>
<appSettings>
<add key="webpages:Version" value="2.0.0.0" />
<add key="webpages:Enabled" value="false" />
<add key="PreserveLoginUrl" value="true" />
<add key="ClientValidationEnabled" value="true" />
<add key="UnobtrusiveJavaScriptEnabled" value="true" />
</appSettings>
<system.net>
<settings>
<httpWebRequest useUnsafeHeaderParsing="true" />
</settings>
<mailSettings>
<smtp from="address@email.com">
<network host="smtp.server.com" port="25" />
</smtp>
</mailSettings>
</system.net>
<system.web>
<compilation debug="true" targetFramework="4.0" />
<authentication mode="None" />
<pages>
<namespaces>
<add namespace="System.Web.Helpers" />
<add namespace="System.Web.Mvc" />
<add namespace="System.Web.Mvc.Ajax" />
<add namespace="System.Web.Mvc.Html" />
<add namespace="System.Web.Optimization" />
<add namespace="System.Web.Routing" />
<add namespace="System.Web.WebPages" />
</namespaces>
</pages>
</system.web>
<system.webServer>
<validation validateIntegratedModeConfiguration="false" />
<modules runAllManagedModulesForAllRequests="true" />
<handlers>
<remove name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" />
<remove name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" />
<remove name="ExtensionlessUrlHandler-Integrated-4.0" />
<add name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll" preCondition="classicMode,runtimeVersionv4.0,bitness32" responseBufferLimit="0" />
<add name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" preCondition="classicMode,runtimeVersionv4.0,bitness64" responseBufferLimit="0" />
<add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
</handlers>
</system.webServer>
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-2.0.0.0" newVersion="2.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-4.0.0.0" newVersion="4.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-2.0.0.0" newVersion="2.0.0.0" />
</dependentAssembly>
</assemblyBinding>
</runtime>
</configuration>
我也试过让这个方法只返回一个直接的EmailQueueResult，这给了我相同的结果。
编辑： 以下是我尝试过的一些测试结果：
发送POST的代码行：
EmailQueueResult result = PostToWebService<EmailQueueMessage, EmailQueueResult>(EmailQueueBaseAddress, "application/json", EmailQueueUrlToCall, emailQueueMessage);
实际进行调用的PostToWebService方法：
protected returnType PostToWebService<dataType, returnType>(string baseAddress, string mediaType, string urlToCall, dataType data)
{
HttpClient client = new HttpClient();
client.BaseAddress = new Uri(baseAddress);
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue(mediaType));
MediaTypeFormatter jsonFormatter = new JsonMediaTypeFormatter();
HttpContent content = new ObjectContent<dataType>(data, jsonFormatter);
HttpResponseMessage response = client.PostAsync(urlToCall, content).Result;
returnType result = response.Content.ReadAsAsync<returnType>().Result;
return result;
}
更新：我在2008服务器上安装了网站和网络服务。唯一失败的组合似乎是2003年盒子上的网站服务从2003年的网站（2003网站 - ＆gt; 2003服务）上调用。其他三种组合（2008网站 - ＆gt; 2008服务，2008网站 - ＆gt; 2003服务，2003网站 - ＆gt; 2008服务）似乎都正常工作。
答案 0 :(得分：0)
好的，事实证明这与代码没有关系，正如你们有些人已经表达过的那样。基本上，我必须将2003盒子上的hosts文件中的本地环回地址（127.0.0.1）更改为2003盒子的实际IP，现在一切正常。去图。