Additional CosmosDBInputAttribute constructors

extensions/Worker.Extensions.CosmosDB/release_notes.md

@@ -6,4 +6,4 @@
 
 ### Microsoft.Azure.Functions.Worker.Extensions.CosmosDB <version>
 
-- <entry>
+- Updated CosmosDBInputAttribute constructors to allow empty values for databaseName and containerName

extensions/Worker.Extensions.CosmosDB/src/CosmosDBInputAttribute.cs

@@ -2,6 +2,7 @@
 // Licensed under the MIT License. See License.txt in the project root for license information.
 
 using System.Collections.Generic;
+using System.Text.Json.Serialization;
 using Microsoft.Azure.Functions.Worker.Converters;
 using Microsoft.Azure.Functions.Worker.Extensions.Abstractions;
 
@@ -11,11 +12,34 @@ namespace Microsoft.Azure.Functions.Worker
     [InputConverter(typeof(CosmosDBConverter))]
     public sealed class CosmosDBInputAttribute : InputBindingAttribute
     {
-        /// <summary>
+        /// <Summary>
         /// Constructs a new instance.
+        /// Use this constructor when binding to a CosmosClient.
+        /// </summary>
+        public CosmosDBInputAttribute()
+        {
+            DatabaseName = string.Empty;
+            ContainerName = string.Empty;
+        }
+
+        /// <Summary>
+        /// Constructs a new instance with the specified database name.
+        /// Use this constructor when binding to a Database.
+        /// </summary>
+        /// <param name="databaseName">The CosmosDB database name.</param>
+        public CosmosDBInputAttribute(string databaseName)
+        {
+            DatabaseName = databaseName;
+            ContainerName = string.Empty;
+        }
+
+        /// <summary>
+        /// Constructs a new instance with the specified database and container names.
+        /// Use this constructor when binding to a Container or a POCO.
         /// </summary>
         /// <param name="databaseName">The CosmosDB database name.</param>
         /// <param name="containerName">The CosmosDB container name.</param>
+        [JsonConstructor]
         public CosmosDBInputAttribute(string databaseName, string containerName)
         {
             DatabaseName = databaseName;

samples/WorkerBindingSamples/Cosmos/CosmosInputBindingFunctions.cs

@@ -21,7 +21,7 @@ public CosmosInputBindingFunctions(ILogger<CosmosInputBindingFunctions> logger)
         [Function(nameof(DocsByUsingCosmosClient))]
         public async Task<HttpResponseData>  DocsByUsingCosmosClient(
             [HttpTrigger(AuthorizationLevel.Function, "get", "post")] HttpRequestData req,
-            [CosmosDBInput("", "", Connection = "CosmosDBConnection")] CosmosClient client)
+            [CosmosDBInput(Connection = "CosmosDBConnection")] CosmosClient client)
         {
             _logger.LogInformation("C# HTTP trigger function processed a request.");
 
@@ -43,7 +43,7 @@ public async Task<HttpResponseData>  DocsByUsingCosmosClient(
         [Function(nameof(DocsByUsingDatabaseClient))]
         public async Task<HttpResponseData> DocsByUsingDatabaseClient(
             [HttpTrigger(AuthorizationLevel.Function, "get", "post")] HttpRequestData req,
-            [CosmosDBInput("ToDoItems", "", Connection = "CosmosDBConnection")] Database database)
+            [CosmosDBInput("ToDoItems", Connection = "CosmosDBConnection")] Database database)
         {
             _logger.LogInformation("C# HTTP trigger function processed a request.");