从C#控制台应用程序迁移和运行REST API到ASP.NET

2023年7月31日 221次阅读

需求：

需要在Hosting Server上部署REST API.因此,将代码从C#控制台应用程序迁移到ASP.NET,该代码在localhost上成功运行,但有一些错误

这是下面的代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ServiceModel;
using System.ServiceModel.Web;
using System.Net;
using System.Diagnostics;

namespace WebAPI
{
    [ServiceContract]
    public interface ICalculator
    {
        [OperationContract, WebInvoke(UriTemplate = "/sum", Method = "POST", BodyStyle = WebMessageBodyStyle.Wrapped, RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json)]
        double sum(double x, double y);
    }

    public class Calculator : ICalculator
    {
        public double sum(double x, double y)
        {
            return x + y;
        }
    }
    public partial class Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            Debug.WriteLine("Initializing URL");
            string baseAddress = "http://localhost:8081/Calculator";
            WebServiceHost myHost = new WebServiceHost(typeof(Calculator), new Uri(baseAddress));

            try
            {
                System.Diagnostics.Debug.WriteLine("Starting Service ...");
                myHost.Open();
            }
            catch (Exception ex)
            {

                //Response.Write(ex);
                //System.Diagnostics.Debug.WriteLine("Exception");
                //myHost.Close();
                //throw new FaultException(ex.Message);
            }
        }

    }
}

实际结果：

《从C#控制台应用程序迁移和运行REST API到ASP.NET》
在通过PostMan客户端软件发出/发送POST请求时,除了在Debug的输出窗口中显示的错误之外,还显示了计算值.

The thread 0x3104 has exited with code 0 (0x0).
Application Insights Telemetry (unconfigured): {"name":"Microsoft.ApplicationInsights.Dev.Request","time":"2019-03-22T07:52:36.2582149Z","tags":{"ai.internal.sdkVersion":"web: 2.0.0.25000","ai.device.roleInstance":"DESKTOP-5DRIFMH","ai.operation.name":"GET /default.aspx","ai.operation.id":"mHfOluFrMKQ="},"data":{"baseType":"RequestData","baseData":{"ver":2,"id":"mHfOluFrMKQ=","name":"GET /default.aspx","startTime":"2019-03-22T13:22:36.2582149+05:30","duration":"00:00:04.1154559","success":true,"responseCode":"200","url":"http://localhost:29989/default.aspx","httpMethod":"GET","properties":{"DeveloperMode":"true"}}}}
'iisexpress.exe' (CLR v4.0.30319: /LM/W3SVC/2/ROOT-1-131977147547841156): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_32\System.Transactions\v4.0_4.0.0.0__b77a5c561934e089\System.Transactions.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
The thread 0x332c has exited with code 0 (0x0)

刷新页面后,以下代码引发了异常

myHost.Close();

CommunicationObjectFaultedException was unhandled by user code
An exception of type 'System.ServiceModel.CommunicationObjectFaultedException' occurred in System.ServiceModel.dll but was not handled in user code
Additional information: The communication object, System.ServiceModel.Web.WebServiceHost, cannot be used for communication because it is in the Faulted state.


Exception thrown: 'System.InvalidOperationException' in System.ServiceModel.dll
Exception thrown: 'System.ServiceModel.CommunicationObjectFaultedException' in System.ServiceModel.dll
'iisexpress.exe' (CLR v4.0.30319: /LM/W3SVC/2/ROOT-1-131977214492956233): Loaded 'C:\Windows\assembly\GAC_MSIL\Microsoft.VisualStudio.Debugger.Runtime\14.0.0.0__b03f5f7f11d50a3a\Microsoft.VisualStudio.Debugger.Runtime.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.

throw new FaultException(ex.Message);

CommunicationObjectFaultedException was unhandled by user code
An exception of type 'System.ServiceModel.CommunicationObjectFaultedException' occurred in System.ServiceModel.dll but was not handled in user code
Additional information: The communication object, System.ServiceModel.Web.WebServiceHost, cannot be used for communication because it is in the Faulted state.


Exception thrown: 'System.InvalidOperationException' in System.ServiceModel.dll
Exception
Exception thrown: 'System.ServiceModel.CommunicationObjectFaultedException' in System.ServiceModel.dll
'iisexpress.exe' (CLR v4.0.30319: /LM/W3SVC/2/ROOT-1-131977154884215275): Loaded 'C:\Windows\assembly\GAC_MSIL\Microsoft.VisualStudio.Debugger.Runtime\14.0.0.0__b03f5f7f11d50a3a\Microsoft.VisualStudio.Debugger.Runtime.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.

如果没有Catch Block,则会在“事件”选项卡的“诊断工具”窗口中堆叠以下异常

Exception: Exception thrown: 'System.InvalidOperationException' in System.ServiceModel.dll ("The ChannelDispatcher at 'http://localhost:8081/Calculator' with contract(s) '"ICalculator"' is unable to open its IChannelListener."). Exception thrown: 'System.InvalidOperationException' in System.ServiceModel.dll ("The ChannelDispatcher at 'http://localhost:8081/Calculator' with contract(s) '"ICalculator"' is unable to open its IChannelListener.")

我怎么需要捕获这些异常

更改字符串baseAddress =“http：//somedomain.xy:8081 / Calculator”;
并将其上传到服务器中
PostMan显示为

Could not get any response There was an error connecting to
07001.

预期结果：
通过PostMan进行调用时,需要显示计算值
因为我需要在托管服务器上启动并运行服务.因为我既无法找出问题的根本原因,也无法解决整个问题的解决方案,无论是从编码部分弹出还是端口问题？

最佳答案

The thread 0x3104 has exited with code 0 (0x0).
Application Insights Telemetry (unconfigured): {"name":"Microsoft.ApplicationInsights.Dev.Request","time":"2019-03-22T07:52:36.2582149Z","tags":{"ai.internal.sdkVersion":"web: 2.0.0.25000","ai.device.roleInstance":"DESKTOP-5DRIFMH","ai.operation.name":"GET /default.aspx","ai.operation.id":"mHfOluFrMKQ="},"data":{"baseType":"RequestData","baseData":{"ver":2,"id":"mHfOluFrMKQ=","name":"GET /default.aspx","startTime":"2019-03-22T13:22:36.2582149+05:30","duration":"00:00:04.1154559","success":true,"responseCode":"200","url":"http://localhost:29989/default.aspx","httpMethod":"GET","properties":{"DeveloperMode":"true"}}}}
'iisexpress.exe' (CLR v4.0.30319: /LM/W3SVC/2/ROOT-1-131977147547841156): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_32\System.Transactions\v4.0_4.0.0.0__b77a5c561934e089\System.Transactions.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
The thread 0x332c has exited with code 0 (0x0)

“输出”窗口中的这些行都是完全正常的,可以忽略(当不再使用时,线程退出时出现非错误代码0,遥测日志记录,程序集被加载到IIS进程中).

您之后遇到的具体错误是因为您尝试多次托管WCF服务.这就是它第一次加载页面时的工作原理,但在刷新页面后失败(因为您已重新配置并重新启动了另一个服务实例).

虽然您的代码可以在控制台应用程序中运行,但这不是您在IIS中托管WCF服务的方式.在Microsoft Docs站点上有一个详细的设置演练：

Deploying an Internet Information Services-Hosted WCF Service

虽然完整的教程不适合Stack Overflow答案,但我将引用一般步骤：

  • Ensure that IIS, ASP.NET, WCF, and the WCF activation component are correctly installed and registered.

  • Create a new IIS application, or reuse an existing ASP.NET application.

  • Create a .svc file for the WCF service.

  • Deploy the service implementation to the IIS application.

  • Configure the WCF service.

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