WCF openation實(shí)際應(yīng)用異常解決方案
WCF的實(shí)際應(yīng)用方法多樣化,要想全部掌握是一件非常困難的事情。不過(guò)我們可以在不斷的實(shí)踐中去積累應(yīng)用經(jīng)驗(yàn),以幫助我們提高熟練應(yīng)用程度。在這里就可以先學(xué)到一個(gè)WCF openation的應(yīng)技巧。
很多時(shí)候我們用到方法的重載,在WCF中也不例外.不過(guò)需要加一點(diǎn)東西.我們以正常的方法來(lái)寫一個(gè)方法的重載,代碼如下:
- [ServiceContract]
- public interface ICalculatorContract
- {
- [OperationContract]
- int add(int x, int y);
- [OperationContract]
- double add(double x, double y);
- }
我把a(bǔ)dd方法進(jìn)行了重載.
- public class CalculatorService:ICalculatorContract
- {
- #region ICalculatorContract Members
- int ICalculatorContract.add(int x, int y)
- {
- return x + y;
- }
- #endregion
- #region ICalculatorContract Members
- public double add(double x, double y)
- {
- return x + y;
- }
- #endregion
- }
host 如下:
- BasicHttpBinding binding = new BasicHttpBinding();
- Uri baseUri=new Uri ("http://172.28.3.45/CalculatorService");
- ServiceHost host = new ServiceHost(typeof(CalculatorService), baseUri);
- host.AddServiceEndpoint(typeof(ICalculatorContract),
binding,string.Empty);- ServiceMetadataBehavior behavior = host.Description.Behaviors.
Find<ServiceMetadataBehavior>();- if (behavior == null)
- {
- behavior = new ServiceMetadataBehavior();
- behavior.HttpGetEnabled = true;
- behavior.HttpGetUrl = baseUri;
- host.Description.Behaviors.Add(behavior);
- }
- host.Open();
這時(shí)我們運(yùn)行host會(huì)出現(xiàn)異常:
Cannot have two operations in the same contract with the same name, methods add and add in type CalculatorContract.ICalculatorContract violate this rule. You can change the name of one of the operations by changing the method name or by using the Name property of OperationContractAttribute.
出現(xiàn)這個(gè)異常的原因是因?yàn)閟oap message action,不能區(qū)分這兩個(gè)方法:所以解決如下:
- [ServiceContract]
- public interface ICalculatorContract
- {
- [OperationContract(Name="add1")]
- int add(int x, int y);
- [OperationContract(Name="add2")]
- double add(double x, double y);
- }
為WCF openation加一個(gè)***的name值.這樣不可以soap message區(qū)分這兩個(gè)方法了.再次運(yùn)行host.沒有異常了.
這樣客戶端就可以正常使用add方法.
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