feat(genai): add thinking samples

genai/api/GenAI.Samples.Tests/Thinking/ThinkingBudgetWithTxtTest.cs

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+/*
+ * Copyright 2025 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+using System.Threading.Tasks;
+using Xunit;
+
+[Collection(nameof(GenAIFixture))]
+public class ThinkingBudgetWithTxtTest
+{
+    private readonly GenAIFixture _fixture;
+    private readonly ThinkingBudgetWithTxt _sample;
+
+    public ThinkingBudgetWithTxtTest(GenAIFixture fixture)
+    {
+        _fixture = fixture;
+        _sample = new ThinkingBudgetWithTxt();
+    }
+
+    [Fact]
+    public async Task TestThinkingBudgetWithTxt()
+    {
+        var response = await _sample.GenerateContent(_fixture.ProjectId);
+        Assert.NotEmpty(response);
+    }
+}

genai/api/GenAI.Samples.Tests/Thinking/ThinkingIncludeThoughtsWithTxtTest.cs

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+/*
+ * Copyright 2025 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+using System.Threading.Tasks;
+using Xunit;
+
+[Collection(nameof(GenAIFixture))]
+public class ThinkingIncludeThoughtsWithTxtTest
+{
+    private readonly GenAIFixture _fixture;
+    private readonly ThinkingIncludeThoughtsWithTxt _sample;
+
+    public ThinkingIncludeThoughtsWithTxtTest(GenAIFixture fixture)
+    {
+        _fixture = fixture;
+        _sample = new ThinkingIncludeThoughtsWithTxt();
+    }
+
+    [Fact]
+    public async Task TestThinkingIncludeThoughtsWithTxt()
+    {
+        var response = await _sample.GenerateContent(_fixture.ProjectId);
+        Assert.NotEmpty(response);
+    }
+}

genai/api/GenAI.Samples.Tests/Thinking/ThinkingWithTxtTest.cs

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+/*
+ * Copyright 2025 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+using System.Threading.Tasks;
+using Xunit;
+
+[Collection(nameof(GenAIFixture))]
+public class ThinkingWithTxtTest
+{
+    private readonly GenAIFixture _fixture;
+    private readonly ThinkingWithTxt _sample;
+
+    public ThinkingWithTxtTest(GenAIFixture fixture)
+    {
+        _fixture = fixture;
+        _sample = new ThinkingWithTxt();
+    }
+
+    [Fact]
+    public async Task TestThinkingWithTxt()
+    {
+        var response = await _sample.GenerateContent(_fixture.ProjectId);
+        Assert.NotEmpty(response);
+    }
+}

genai/api/GenAI.Samples/Thinking/ThinkingBudgetWithTxt.cs

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+/*
+ * Copyright 2025 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// [START googlegenaisdk_thinking_budget_with_txt]
+
+using Google.GenAI;
+using Google.GenAI.Types;
+using System;
+using System.Threading.Tasks;
+
+public class ThinkingBudgetWithTxt
+{
+    public async Task<string> GenerateContent(
+        string projectId = "your-project-id",
+        string location = "global",
+        string model = "gemini-2.5-flash")
+    {
+        var client = new Client(project: projectId, location: location, vertexAI: true);
+
+        GenerateContentResponse response = await client.Models.GenerateContentAsync(
+            model: model,
+            contents: "solve x^2 + 4x + 4 = 0",
+            config: new GenerateContentConfig
+            {
+                ThinkingConfig = new ThinkingConfig { ThinkingBudget = 1024 }
+            });
+
+        string responseText = response.Candidates[0].Content.Parts[0].Text;
+        Console.WriteLine(responseText);
+        // Example reponse:
+        // To solve the equation $x^2 + 4x + 4 = 0$, we can use several methods:
+        // **Method 1: Factoring(Recognizing a Perfect Square Trinomial) * *
+        // Notice that the left side of the equation is a perfect square trinomial.
+        // It follows the pattern $a ^ 2 + 2ab + b ^ 2 = (a + b) ^ 2$.
+        // ...
+        // All methods yield the same solution.
+        // The solution is $x = -2$.
+
+        Console.WriteLine($"Token count for thinking: {response.UsageMetadata.ThoughtsTokenCount}");
+        // Example response:
+        // Token count for thinking: 804
+        return responseText;
+    }
+}
+// [END googlegenaisdk_thinking_budget_with_txt]

genai/api/GenAI.Samples/Thinking/ThinkingIncludeThoughtsWithTxt.cs

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+/*
+ * Copyright 2025 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// [START googlegenaisdk_thinking_includethoughts_with_txt]
+
+using Google.GenAI;
+using Google.GenAI.Types;
+using System;
+using System.Threading.Tasks;
+
+public class ThinkingIncludeThoughtsWithTxt
+{
+    public async Task<string> GenerateContent(
+        string projectId = "your-project-id",
+        string location = "global",
+        string model = "gemini-2.5-pro")
+    {
+        var client = new Client(project: projectId, location: location, vertexAI: true);
+
+        GenerateContentResponse response = await client.Models.GenerateContentAsync(
+            model: model,
+            contents: "solve x^2 + 4x + 4 = 0",
+            config: new GenerateContentConfig
+            {
+                ThinkingConfig = new ThinkingConfig { IncludeThoughts = true }
+            });
+
+        foreach (Part part in response.Candidates[0].Content.Parts)
+        {
+            if (part.Thought.GetValueOrDefault(false))
+            {
+                Console.WriteLine(part.Text);
+            }
+        }
+        // Example response:
+        // Alright, let's break down this quadratic equation, `x^2 + 4x + 4 = 0`. First things first, I recognize
+        // this is a standard quadratic form, perfect for applying my knowledge.
+        // 1. **Analyze and Prep:**Okay, the user wants the solution.Got it. This is a quadratic in standard
+        // form, `ax ^ 2 + bx + c = 0`. That means I have several solution strategies at my disposal.
+        // 2. **Coefficients in Hand: **  `a` is 1, `b` is 4, and `c` is also 4.Easy enough.
+        // 3. **Method Selection - The Decision Point:**Now, I've got to choose the most efficient path.
+        // I could *always* use the quadratic formula, but that might be overkill. Factoring is always worth a
+        // look, especially when dealing with smaller coefficients. Completing the square is a possibility, but
+        // less elegant here. Graphing... well, that's more for visualization, not direct algebraic solution.
+        // 4. **Evaluate for *This * Case:**Let's see if factoring holds up.
+        // ...
+        // * End with a concise summary of the key takeaway, emphasizing that it's a repeated root.
+        // Perfect.The plan is set, the path is clear.
+        return response.Candidates[0].Content.Parts[0].Text;
+    }
+}
+// [END googlegenaisdk_thinking_includethoughts_with_txt]

genai/api/GenAI.Samples/Thinking/ThinkingWithTxt.cs

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+/*
+ * Copyright 2025 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// [START googlegenaisdk_thinking_with_txt]
+
+using Google.GenAI;
+using Google.GenAI.Types;
+using System;
+using System.Threading.Tasks;
+
+public class ThinkingWithTxt
+{
+    public async Task<string> GenerateContent(
+        string projectId = "your-project-id",
+        string location = "global",
+        string model = "gemini-2.5-pro")
+    {
+        var client = new Client(project: projectId, location: location, vertexAI: true);
+
+        GenerateContentResponse response = await client.Models.GenerateContentAsync(
+            model: model,
+            contents: "solve x^2 + 4x + 4 = 0");
+
+        string responseText = response.Candidates[0].Content.Parts[0].Text;
+        Console.WriteLine(responseText);
+        // Example reponse:
+        // Of course! We can solve the equation **x² + 4x + 4 = 0** in a couple of ways.
+        // ### Method 1: Factoring
+        // This is the quickest method for this particular problem.
+        // 1.  * *Recognize the pattern:**The expression `x² +4x + 4` is a perfect square trinomial
+        // ...
+        // Both methods give the same result.
+        // **The solution is x = -2.**
+        return responseText;
+    }
+}
+// [END googlegenaisdk_thinking_with_txt]