[skip ci] add convenience method to response types

src/Mscc.GenerativeAI/Types/Generative/GenerateAnswerResponse.cs

@@ -1,4 +1,5 @@
 #if NET472_OR_GREATER || NETSTANDARD2_0
+using System;
 using System.Collections.Generic;
 using System.Linq;
 #endif
@@ -37,5 +38,14 @@ public string? Text
         /// Output only. Feedback related to the input data used to answer the question, as opposed to model-generated response to the question.
         /// </summary>
         public PromptFeedback InputFeedback { get; set; }
+
+        /// <summary>
+        /// A convenience overload to easily access the responded text.
+        /// </summary>
+        /// <returns>The responded text information of first candidate.</returns>
+        public override string ToString()
+        {
+            return Text ?? String.Empty;
+        }
     }
 }

src/Mscc.GenerativeAI/Types/Generative/GenerateContentResponse.cs

@@ -1,4 +1,5 @@
 #if NET472_OR_GREATER || NETSTANDARD2_0
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text.Json.Serialization;
@@ -13,7 +14,7 @@ namespace Mscc.GenerativeAI
     public class GenerateContentResponse
     {
         /// <summary>
-        /// Responded text information of first candidate.
+        /// A convenience property to get the responded text information of first candidate.
         /// </summary>
         [JsonIgnore]
 		public string? Text
@@ -26,7 +27,7 @@ FinishReason.Safety or
                     FinishReason.Recitation or
                     FinishReason.Other)
                     return string.Empty;
-                return Candidates?.FirstOrDefault()?.Content?.Parts?.FirstOrDefault()?.Text;
+                return Candidates?.FirstOrDefault()?.Content?.Parts.FirstOrDefault()?.Text;
             }
         }
 
@@ -44,5 +45,14 @@ FinishReason.Recitation or
         /// Usage metadata about the response(s).
         /// </summary>
         public UsageMetadata? UsageMetadata { get; set; }
+
+        /// <summary>
+        /// A convenience overload to easily access the responded text.
+        /// </summary>
+        /// <returns>The responded text information of first candidate.</returns>
+        public override string ToString()
+        {
+            return Text ?? String.Empty;
+        }
     }
 }

src/Mscc.GenerativeAI/Types/Generative/GenerateMessageResponse.cs

@@ -1,4 +1,5 @@
 #if NET472_OR_GREATER || NETSTANDARD2_0
+using System;
 using System.Collections.Generic;
 using System.Linq;
 #endif
@@ -28,5 +29,14 @@ public class GenerateMessageResponse
         /// This indicates which SafetyCategory(s) blocked a candidate from this response, the lowest HarmProbability that triggered a block, and the HarmThreshold setting for that category. This indicates the smallest change to the SafetySettings that would be necessary to unblock at least 1 response.
         /// </summary>
         public List<ContentFilter>? Filters { get; set; }
+
+        /// <summary>
+        /// A convenience overload to easily access the responded text.
+        /// </summary>
+        /// <returns>The responded text information of first candidate.</returns>
+        public override string ToString()
+        {
+            return Text ?? String.Empty;
+        }
     }
 }

src/Mscc.GenerativeAI/Types/Generative/GenerateTextResponse.cs

@@ -1,4 +1,5 @@
 #if NET472_OR_GREATER || NETSTANDARD2_0
+using System;
 using System.Collections.Generic;
 using System.Linq;
 #endif
@@ -31,5 +32,14 @@ public class GenerateTextResponse
         /// Returns any safety feedback related to content filtering.
         /// </summary>
         public List<SafetyFeedback>? SafetyFeedback { get; set; }
+
+        /// <summary>
+        /// A convenience overload to easily access the responded text.
+        /// </summary>
+        /// <returns>The responded text information of first candidate.</returns>
+        public override string ToString()
+        {
+            return Text ?? String.Empty;
+        }
     }
 }