ApiInterceptor增加CreateApiActionContext方法，提供扩展的能力

Author: xljiulang

WebApiClient/Defaults/ApiInterceptor.cs

@@ -47,12 +47,11 @@ public ApiInterceptor(HttpApiConfig httpApiConfig)
         /// <returns></returns>
         public virtual object Intercept(object target, MethodInfo method, object[] parameters)
         {
+            var httpApi = target as IHttpApi;
             var descriptor = this.GetApiActionDescriptor(method, parameters);
-            var apiTask = descriptor.Return.DataType.ITaskFactory.Invoke() as ApiTask;
 
-            apiTask.HttpApi = target as IHttpApi;
-            apiTask.HttpApiConfig = this.HttpApiConfig;
-            apiTask.ApiActionDescriptor = descriptor;
+            var apiTask = descriptor.Return.DataType.ITaskFactory.Invoke() as ApiTask;
+            apiTask.ContextFactory = () => this.CreateApiActionContext(httpApi, descriptor);
 
             if (descriptor.Return.IsITaskDefinition == false)
             {
@@ -66,6 +65,7 @@ public virtual object Intercept(object target, MethodInfo method, object[] param
 
         /// <summary>
         /// 获取api的描述
+        /// 默认实现使用了缓存
         /// </summary>
         /// <param name="method">接口的方法</param>
         /// <param name="parameters">参数值集合</param>
@@ -75,6 +75,17 @@ protected virtual ApiActionDescriptor GetApiActionDescriptor(MethodInfo method,
             return descriptorCache.GetOrAdd(method, m => new ApiActionDescriptor(m)).Clone(parameters);
         }
 
+        /// <summary>
+        /// 返回创建ApiActionContext新实例
+        /// </summary>
+        /// <param name="httpApi">httpApi代理类实例</param>
+        /// <param name="apiActionDescriptor">api的描述</param>
+        /// <returns></returns>
+        protected virtual ApiActionContext CreateApiActionContext(IHttpApi httpApi, ApiActionDescriptor apiActionDescriptor)
+        {
+            return new ApiActionContext(httpApi, this.HttpApiConfig, apiActionDescriptor);
+        }
+
         /// <summary>
         /// 释放资源
         /// </summary>

WebApiClient/Internal/Tasks/ApiTask.cs

@@ -1,4 +1,5 @@
-using System.Runtime.CompilerServices;
+using System;
+using System.Runtime.CompilerServices;
 using System.Threading.Tasks;
 using WebApiClient.Contexts;
 
@@ -24,19 +25,9 @@ abstract class ApiTask
 #endif
 
         /// <summary>
-        /// 获取或设置httpApi代理类实例
+        /// 获取或设置上下文创建工厂
         /// </summary>
-        public IHttpApi HttpApi { get; set; }
-
-        /// <summary>
-        /// 获取或设置http接口配置
-        /// </summary>
-        public HttpApiConfig HttpApiConfig { get; set; }
-
-        /// <summary>
-        /// 获取或设置api描述
-        /// </summary>
-        public ApiActionDescriptor ApiActionDescriptor { get; set; }
+        public Func<ApiActionContext> ContextFactory { get; set; }
 
         /// <summary>
         /// 执行任务
@@ -96,7 +87,7 @@ Task ITask.InvokeAsync()
         /// <returns></returns>
         public virtual async Task<TResult> InvokeAsync()
         {
-            var context = new ApiActionContext(this.HttpApi, this.HttpApiConfig, this.ApiActionDescriptor);
+            var context = this.ContextFactory.Invoke();
             return await context.ExecuteActionAsync<TResult>().ConfigureAwait(false);
         }
     }