update csharp configuration to avoid circular dependency, deprecate

ApiClient.Default

modules/swagger-codegen/src/main/resources/csharp/ApiClient.mustache

@@ -61,7 +61,8 @@ namespace {{packageName}}.Client
         /// Gets or sets the default API client for making HTTP calls.
         /// </summary>
         /// <value>The default API client.</value>
-        public static ApiClient Default = new ApiClient(Configuration.Default);
+        [Obsolete("ApiClient.Default is deprecated, please use 'Configuraiton.Default.ApiClient' instead.")]
+        public static ApiClient Default;
     
         /// <summary>
         /// Gets or sets the Configuration.

modules/swagger-codegen/src/main/resources/csharp/Configuration.mustache

@@ -37,10 +37,7 @@ namespace {{packageName}}.Client
                              int timeout = 100000
                             )
         {
-            if (apiClient == null)
-                ApiClient = ApiClient.Default == null ? new ApiClient() : ApiClient.Default;
-            else
-                ApiClient = apiClient;
+            setApiClientUsingDefault(apiClient);
 
             Username = username;
             Password = password;
@@ -64,18 +61,15 @@ namespace {{packageName}}.Client
         /// <param name="apiClient">Api client.</param>
         public Configuration(ApiClient apiClient)
         {
-            if (apiClient == null)
-                ApiClient = ApiClient.Default;
-            else 
-                ApiClient = apiClient;
+            setApiClientUsingDefault(apiClient);
         }
-  
+
         /// <summary>
         /// Version of the package.
         /// </summary>
         /// <value>Version of the package.</value>
         public const string Version = "{{packageVersion}}";
-  
+
         /// <summary>
         /// Gets or sets the default Configuration.
         /// </summary>
@@ -103,8 +97,31 @@ namespace {{packageName}}.Client
         /// <value>The API client.</value>
         public ApiClient ApiClient;
 
+        /// <summary>
+        /// Set the ApiClient using Default or ApiClient instance
+        /// </summary>
+        /// <param name="apiClient">An instance of ApiClient
+        /// <returns></returns>
+        public void setApiClientUsingDefault (ApiClient apiClient = null)
+        {
+            if (apiClient == null)
+            {
+                if (Default != null && Default.ApiClient == null)
+                    Default.ApiClient = new ApiClient();
+
+                ApiClient = Default != null ? Default.ApiClient : new ApiClient();
+            }
+            else
+            {
+                if (Default != null && Default.ApiClient == null)
+                    Default.ApiClient = apiClient;
+
+                ApiClient = apiClient;
+            }
+        }
+
         private Dictionary<String, String> _defaultHeaderMap = new Dictionary<String, String>();
-        
+
         /// <summary>
         /// Gets or sets the default header.
         /// </summary>
@@ -134,13 +151,13 @@ namespace {{packageName}}.Client
         /// </summary>
         /// <value>The username.</value>
         public String Username { get; set; }
-  
+
         /// <summary>
         /// Gets or sets the password (HTTP basic authentication).
         /// </summary>
         /// <value>The password.</value>
         public String Password { get; set; }
-  
+
         /// <summary>
         /// Gets or sets the access token for OAuth2 authentication.
         /// </summary>
@@ -152,7 +169,7 @@ namespace {{packageName}}.Client
         /// </summary>
         /// <value>The API key.</value>
         public Dictionary<String, String> ApiKey = new Dictionary<String, String>();
-  
+
         /// <summary>
         /// Gets or sets the prefix (e.g. Token) of the API key based on the authentication name.
         /// </summary>
@@ -174,9 +191,9 @@ namespace {{packageName}}.Client
             else
                 return apiKeyValue;
         }
-  
+
         private string _tempFolderPath = Path.GetTempPath();
-  
+
         /// <summary>
         /// Gets or sets the temporary folder path to store the files downloaded from the server.
         /// </summary>
@@ -184,19 +201,19 @@ namespace {{packageName}}.Client
         public String TempFolderPath
         {
             get { return _tempFolderPath; }
-  
-            set 
+
+            set
             {
                 if (String.IsNullOrEmpty(value))
                 {
                     _tempFolderPath = value;
                     return;
                 }
-      
+
                 // create the directory if it does not exist
                 if (!Directory.Exists(value)) 
                     Directory.CreateDirectory(value);
-      
+
                 // check if the path contains directory separator at the end
                 if (value[value.Length - 1] == Path.DirectorySeparatorChar)
                     _tempFolderPath = value;
@@ -251,7 +268,7 @@ namespace {{packageName}}.Client
                      .Where(x => x.Name == "System.Core").First().Version.ToString()  + "\n";
             report += "    Version of the API: {{version}}\n";
             report += "    SDK Package Version: {{packageVersion}}\n";
-  
+
             return report;
         }
     }