c# - 如何在 .Net 控制台应用程序 WCF 服务中启用跨域资源共享?
问题描述
我有一个具有 RESTful WCF 服务的 .netframework(4.5.2) 控制台应用程序。
我在使用 Javascript 客户端的休息服务时遇到问题。
当我使用 Postman 消费 rest 服务时,没有问题。
当我使用 Javascript 获取方法时,出现 CORS 错误
from origin 'http://localhost:3000' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.
我尝试了谷歌的以下解决方案;
1-添加Web.config customHeaders
。
但是,没有 web.config,我添加下面的代码 App.config
<httpProtocol>
<customHeaders>
<add name="Access-Control-Allow-Origin" value="*"/>
<add name="Access-Control-Allow-Headers" value="Content-Type, Accept" />
<add name="Access-Control-Allow-Methods" value="POST,GET,OPTIONS" />
<add name="Access-Control-Max-Age" value="1728000" />
</customHeaders>
2- Global.asax
由于前面提到的原因,没有 Global.asax。我不能试试这个。
3- WCF 生成器
我在构建 wcf 服务时允许了这个 CrossDomain 控件。这也行不通。
var binding = new WebHttpBinding(WebHttpSecurityMode.None);
binding.CrossDomainScriptAccessEnabled = true;
感谢您的建议。
编辑
我还在 github 上创建了一个测试应用程序。您可以看到 Postman 请求到达服务方法,但 javascript 请求没有。它给出了以下错误。
https://github.com/mmustafau/StackoverServiceTestnet
...已被 CORS 策略阻止:对预检请求的响应未通过访问控制检查:它没有 HTTP ok 状态。
我的javascript请求如下。
let receiptJson = {
"Email": "asdas@asdas.com",
"Name": "asdasd",
"Password": "asdasd"
}
const requestOptions = {
method: 'POST',
headers:{ 'Content-Type': 'application/json',
},
body: JSON.stringify (receiptJson)
};
return fetch("http://localhost:8070/ServiceModelSamples/service/user", requestOptions)
.then(handleResponse)
.then(receiptJson => {
return receiptJson;
});
解决方案
WCF中有两种解决跨域问题的方法。首先是在WCF项目中添加全局配置文件。项目部署到IIS后,IIS会读取添加的全局配置文件,解决跨域问题,就像web项目一样。
protected void Application_BeginRequest(object sender, EventArgs e)
{
HttpContext.Current.Response.AddHeader("Access-Control-Allow-Origin", "*");
if (HttpContext.Current.Request.HttpMethod == "OPTIONS")
{
HttpContext.Current.Response.AddHeader("Access-Control-Allow-Methods", "*");
HttpContext.Current.Response.AddHeader("Access-Control-Allow-Headers", "*");
HttpContext.Current.Response.End();
}
}
修改全局配置文件,解决跨域问题。
第二种方式是让WCF支持jsonp。我们可以在配置文件中启用JSONP。
<binding name="bind1" crossDomainScriptAccessEnabled="true">
</binding>
更新
您可以实现 idispatchmessageinspector 以在服务响应之前添加响应标头。
public class ServerMessageLogger : IDispatchMessageInspector
{
public object AfterReceiveRequest(ref Message request, IClientChannel channel, InstanceContext instanceContext)
{
return null;
}
public void BeforeSendReply(ref Message reply, object correlationState)
{
WebOperationContext ctx = WebOperationContext.Current;
ctx.OutgoingResponse.Headers.Add("Access-Control-Allow-Origin", "*");
}
}
有关 IDispatchMessageInspector 的更多信息,请参考以下链接:
代码
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.ServiceModel.Channels;
using System.ServiceModel.Description;
using System.ServiceModel.Dispatcher;
using System.ServiceModel.Web;
using System.Text;
using System.Threading.Tasks;
using System.Web;
using System.Xml;
namespace Demo_rest_ConsoleApp
{
public class ServerMessageLogger : IDispatchMessageInspector
{
public object AfterReceiveRequest(ref Message request, IClientChannel channel, InstanceContext instanceContext)
{
return null;
}
public void BeforeSendReply(ref Message reply, object correlationState)
{
WebOperationContext ctx = WebOperationContext.Current;
ctx.OutgoingResponse.Headers.Add("Access-Control-Allow-Origin", "*");
}
}
public class ClientMessageLogger : IClientMessageInspector
{
public void AfterReceiveReply(ref Message reply, object correlationState)
{
}
public object BeforeSendRequest(ref Message request, IClientChannel channel)
{
return null;
}
}
[AttributeUsage(AttributeTargets.Interface | AttributeTargets.Class, AllowMultiple = false)]
public class CustContractBehaviorAttribute : Attribute, IContractBehavior, IContractBehaviorAttribute
{
public Type TargetContract => throw new NotImplementedException();
public void AddBindingParameters(ContractDescription contractDescription, ServiceEndpoint endpoint, BindingParameterCollection bindingParameters)
{
return;
}
public void ApplyClientBehavior(ContractDescription contractDescription, ServiceEndpoint endpoint, ClientRuntime clientRuntime)
{
clientRuntime.ClientMessageInspectors.Add(new ClientMessageLogger());
}
public void ApplyDispatchBehavior(ContractDescription contractDescription, ServiceEndpoint endpoint, DispatchRuntime dispatchRuntime)
{
dispatchRuntime.MessageInspectors.Add(new ServerMessageLogger());
}
public void Validate(ContractDescription contractDescription, ServiceEndpoint endpoint)
{
return;
}
}
}
向服务添加行为
这是我的项目目录
应用程序配置
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
</startup>
<system.serviceModel>
<services>
<service name="Demo_rest_ConsoleApp.Service1" behaviorConfiguration="ServiceBehavior">
<host>
<baseAddresses>
<add baseAddress="http://localhost:8012/ServiceModelSamples/service"/>
</baseAddresses>
</host>
<endpoint address=""
binding="webHttpBinding"
contract="Demo_rest_ConsoleApp.IService1"
behaviorConfiguration="ESEndPointBehavior" />
</service>
</services>
<behaviors>
<endpointBehaviors>
<behavior name="ESEndPointBehavior">
<webHttp helpEnabled="true"/>
</behavior>
</endpointBehaviors>
<serviceBehaviors>
<behavior name="ServiceBehavior">
<serviceMetadata httpGetEnabled="true"/>
</behavior>
</serviceBehaviors>
</behaviors>
</system.serviceModel>
</configuration>
dao.cs
using System;
using System.Data;
using System.Data.SqlClient;
namespace Demo_rest_ConsoleApp
{
public class Sqlservercon
{
public UserData Selectuser(string username)
{
UserData user = new UserData();
user.Email = "Test";
user.Name = "Test";
user.Password = "Test";
return user;
}
public UserData Adduser(UserData userdata)
{
UserData user = new UserData();
user.Email = "Test";
user.Name = "Test";
user.Password = "Test";
return user;
}
public UserData Updateuser(UserData userdata)
{
UserData user = new UserData();
user.Email = "Test";
user.Name = "Test";
user.Password = "Test";
return user;
}
public UserData Deleteuser(UserData userdata)
{
UserData user = new UserData();
user.Email = "Test";
user.Name = "Test";
user.Password = "Test";
return user;
}
}
}
IService1.cs
using System.Runtime.CompilerServices;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.ServiceModel.Web;
using static Demo_rest_ConsoleApp.soap;
namespace Demo_rest_ConsoleApp
{
[ServiceContract]
[CustContractBehavior]
public interface IService1
{
[OperationContract]
[WebInvoke(Method = "GET", UriTemplate = "user/{name}",ResponseFormat = WebMessageFormat.Json)]
Result GetUserData(string name);
[OperationContract]
[WebInvoke(Method = "POST", UriTemplate = "user", RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json)]
Result PostUserData(UserData user);
[OperationContract]
[WebInvoke(Method = "PUT", UriTemplate = "user", RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json)]
Result PutUserData(UserData user);
[OperationContract]
[WebInvoke(Method = "DELETE", UriTemplate = "user", RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json)]
Result DeleteUserData(UserData user);
}
[DataContract(Name = "user")]
public class UserData
{
[DataMember(Name = "Name")]
public string Name { get; set; }
[DataMember(Name = "Password")]
public string Password { get; set; }
[DataMember(Name = "Email")]
public string Email { get; set; }
}
[DataContract(Name = "Result")]
public class Result
{
[DataMember(Name = "Stu")]
public string Stu { get; set; }
[DataMember(Name = "Code")]
public int Code { get; set; }
[DataMember(Name = "UserData")]
public UserData userData { get; set; }
}
}
程序.cs
using System;
using System.ServiceModel;
using System.ServiceModel.Description;
namespace Demo_rest_ConsoleApp
{
class Program
{
static void Main(string[] args)
{
ServiceHost selfHost = new ServiceHost(typeof(Service1));
selfHost.Open();
Console.WriteLine("Service Open");
Console.ReadKey();
selfHost.Close();
}
}
}
服务1.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.ServiceModel.Activation;
using System.ServiceModel.Web;
using System.Text;
namespace Demo_rest_ConsoleApp
{
public class Service1 : IService1
{
Sqlservercon sqlservercon = new Sqlservercon();
public Result PostUserData(UserData user)
{
Result result = new Result();
if (GetUserData(user.Name).Code == 400)
{
sqlservercon.Adduser(user);
result.Code = 200;
result.Stu = user.Name + "Success";
result.userData = user;
return result;
}
else
{
result.Code = 400;
result.Stu = user.Name + "fail";
return result;
}
}
public Result DeleteUserData(UserData user)
{
Result result = new Result();
if (GetUserData(user.Name).Code == 400)
{
result.Code = 400;
result.Stu = user.Name + "fail";
return result;
}
else
{
sqlservercon.Deleteuser(user);
result.Code = 200;
result.Stu = user.Name + "Success!";
result.userData = user;
return result;
}
}
static List<Result> results = new List<Result>();
public Result GetUserData(string name)
{
UserData userData = sqlservercon.Selectuser(name);
Result result = new Result();
if (userData.Name != "")
{
result.userData = userData;
result.Code = 200;
result.Stu = "Success";
results.Add(result);
Console.WriteLine(results.Count);
return result;
}
else
{
result.Code = 400;
result.Stu = "fail";
return result;
}
}
public Result PutUserData(UserData user)
{
Result result = new Result();
if (GetUserData(user.Name).Code == 400)
{
result.Code = 400;
result.Stu = user.Name + "fail";
return result;
}
else
{
sqlservercon.Updateuser(user);
result.Code = 200;
result.Stu = user.Name + "Success";
result.userData = user;
return result;
}
}
}
}
肥皂.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.ServiceModel;
using System.ServiceModel.Channels;
using System.ServiceModel.Description;
using System.ServiceModel.Dispatcher;
using System.ServiceModel.Web;
using System.Text;
using System.Threading.Tasks;
namespace Demo_rest_ConsoleApp
{
class soap
{
public class ServerMessageLogger : IDispatchMessageInspector
{
public object AfterReceiveRequest(ref Message request, IClientChannel channel, InstanceContext instanceContext)
{
return null;
}
public void BeforeSendReply(ref Message reply, object correlationState)
{
WebOperationContext ctx = WebOperationContext.Current;
ctx.OutgoingResponse.Headers.Add("Access-Control-Allow-Origin", "*");
}
}
public class ClientMessageLogger : IClientMessageInspector
{
public void AfterReceiveReply(ref Message reply, object correlationState)
{
}
public object BeforeSendRequest(ref Message request, IClientChannel channel)
{
return null;
}
}
[AttributeUsage(AttributeTargets.Interface | AttributeTargets.Class, AllowMultiple = false)]
public class CustContractBehaviorAttribute : Attribute, IContractBehavior, IContractBehaviorAttribute
{
public Type TargetContract => throw new NotImplementedException();
public void AddBindingParameters(ContractDescription contractDescription, ServiceEndpoint endpoint, BindingParameterCollection bindingParameters)
{
return;
}
public void ApplyClientBehavior(ContractDescription contractDescription, ServiceEndpoint endpoint, ClientRuntime clientRuntime)
{
clientRuntime.ClientMessageInspectors.Add(new ClientMessageLogger());
}
public void ApplyDispatchBehavior(ContractDescription contractDescription, ServiceEndpoint endpoint, DispatchRuntime dispatchRuntime)
{
dispatchRuntime.MessageInspectors.Add(new ServerMessageLogger());
}
public void Validate(ContractDescription contractDescription, ServiceEndpoint endpoint)
{
return;
}
}
}
}
阿贾克斯
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Ajax</title>
<script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("button").click(function () {
var da = { "Email":"123","Name":"dg3","Password":"dasd" };
$.ajax({
type: "get",
dataType: "json",
// contentType: "application/json;charset=utf-16",
// data: JSON.stringify(da),
url: "http://localhost:8070/ServiceModelSamples/service/user/dd", success: function (result) {
document.write( "name:" + (result.UserData).Name + " " + "password:" + (result.UserData).Password + " " + "email:" + (result.UserData).Email);
}});
});
});
</script>
</head>
<body>
<button>Call WCF Rest Service</button>
</body>
</html>
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