Public OperationDescription.Begin/End/SyncMethod properties and add unit test (#5165)

* Public OperationDescription's  Begin/End/SyncMethod properties and add unit test

* Add equal check.

Author: imcarolwang

src/System.Private.ServiceModel/tests/Common/Unit/ServiceInterfaces.cs

@@ -117,6 +117,28 @@ public interface IDescriptionTestsServiceGenerated
     System.Threading.Tasks.Task<string> EchoAsync(string message);
 }
 
+// Dummy interface used for ContractDescriptionTests
+// This code is deliberately not cleaned up after svcutil to test that we work with the raw Add Service Reference code.
+[System.ServiceModel.ServiceContractAttribute(ConfigurationName = "IDescriptionTestsService")]
+public interface IDescriptionTestsServiceBeginEndGenerated
+{
+    [System.ServiceModel.OperationContractAttribute(Action = "http://tempuri.org/IDescriptionTestsService/MessageRequestReply", ReplyAction = "http://tempuri.org/IDescriptionTestsService/MessageRequestReplyResponse")]
+    System.ServiceModel.Channels.Message MessageRequestReply(System.ServiceModel.Channels.Message request);
+
+    [System.ServiceModel.OperationContractAttribute(AsyncPattern = true, Action = "http://tempuri.org/IDescriptionTestsService/MessageRequestReply", ReplyAction = "http://tempuri.org/IDescriptionTestsService/MessageRequestReplyResponse")]
+    System.IAsyncResult BeginMessageRequestReply(System.ServiceModel.Channels.Message request, System.AsyncCallback callback, object asyncState);
+
+    System.ServiceModel.Channels.Message EndMessageRequestReply(System.IAsyncResult result);
+
+    [System.ServiceModel.OperationContractAttribute(Action = "http://tempuri.org/IDescriptionTestsService/Echo", ReplyAction = "http://tempuri.org/IDescriptionTestsService/EchoResponse")]
+    string Echo(string message);
+
+    [System.ServiceModel.OperationContractAttribute(AsyncPattern = true, Action = "http://tempuri.org/IDescriptionTestsService/Echo", ReplyAction = "http://tempuri.org/IDescriptionTestsService/EchoResponse")]
+    System.IAsyncResult BeginEcho(string message, System.AsyncCallback callback, object asyncState);
+
+    string EndEcho(System.IAsyncResult result);
+}
+
 // Manually constructed service interface to validate MessageContract operations.
 // This interface closely matches the one found at http://app.thefreedictionary.com/w8feedback.asmx
 // This was done to test that we would work with that real world app.

src/System.ServiceModel.Primitives/ref/System.ServiceModel.Primitives.cs

@@ -1757,6 +1757,9 @@ public OperationDescription(string name, System.ServiceModel.Description.Contrac
         public string Name { get { return default; } }
         public System.Collections.ObjectModel.KeyedCollection<System.Type, System.ServiceModel.Description.IOperationBehavior> OperationBehaviors { get { return default; } }
         public System.Reflection.MethodInfo TaskMethod { get { return default; } set { } }
+        public System.Reflection.MethodInfo BeginMethod { get { return default; } set { } }
+        public System.Reflection.MethodInfo EndMethod { get { return default; } set { } }
+        public System.Reflection.MethodInfo SyncMethod { get { return default; } set { } }
     }
     public partial class OperationDescriptionCollection : System.Collections.ObjectModel.Collection<System.ServiceModel.Description.OperationDescription>
     {

src/System.ServiceModel.Primitives/tests/Description/ContractDescriptionTest.cs

@@ -202,4 +202,41 @@ public static void ContractDescription_GetContract()
         Assert.Equal(typeof(IDescriptionTestsService).Name, contractDescription.ContractType.Name);
         Assert.Equal("http://tempuri.org/", contractDescription.Namespace);
     }
+
+    [WcfFact]
+    public static void OperationDescription_BeginEndSyncMethod_Property()
+    {
+        ContractDescription contractDescription = ContractDescription.GetContract(typeof(IDescriptionTestsServiceBeginEndGenerated));
+        Assert.Equal(2, contractDescription.Operations.Count);
+        foreach(OperationDescription operation in contractDescription.Operations)
+        {
+            Assert.NotNull(operation.BeginMethod);
+            Assert.NotNull(operation.EndMethod);
+            if(operation.Name.Equals("Echo"))
+            {
+                Assert.Equal(typeof(IDescriptionTestsServiceBeginEndGenerated).GetMethod(nameof(IDescriptionTestsServiceBeginEndGenerated.BeginEcho)), operation.BeginMethod);
+                Assert.Equal(typeof(IDescriptionTestsServiceBeginEndGenerated).GetMethod(nameof(IDescriptionTestsServiceBeginEndGenerated.EndEcho)), operation.EndMethod);
+            }
+            else
+            {
+                Assert.Equal(typeof(IDescriptionTestsServiceBeginEndGenerated).GetMethod(nameof(IDescriptionTestsServiceBeginEndGenerated.BeginMessageRequestReply)), operation.BeginMethod);
+                Assert.Equal(typeof(IDescriptionTestsServiceBeginEndGenerated).GetMethod(nameof(IDescriptionTestsServiceBeginEndGenerated.EndMessageRequestReply)), operation.EndMethod);
+            }
+        }
+
+        contractDescription = ContractDescription.GetContract(typeof(IDescriptionTestsService));
+        Assert.Equal(2, contractDescription.Operations.Count);
+        foreach (OperationDescription operation in contractDescription.Operations)
+        {
+            Assert.NotNull(operation.SyncMethod);
+            if (operation.Name.Equals("Echo"))
+            {
+                Assert.Equal(typeof(IDescriptionTestsService).GetMethod(nameof(IDescriptionTestsService.Echo)), operation.SyncMethod);
+            }
+            else
+            {
+                Assert.Equal(typeof(IDescriptionTestsService).GetMethod(nameof(IDescriptionTestsService.MessageRequestReply)), operation.SyncMethod);
+            }
+        }
+    }
 }