AI Webpage to .NET DataFrame

README.md

Prerequisites

• .NET 9 SDK
• Install the following NuGet Packages
  • Microsoft.Extensions.AI.AzureAIInference
  • Microsoft.Extensions.AI
  • Azure.Identity
  • Microsoft.Data.Analysis
• GitHub Personal Access Token

Input

What the input source image looks like

Output

.NET Version	Original release date	Latest patch version	Patch release date	Release type	Support phase	End of support
.NET 9	11/12/2024	9.0.0	11/12/2024	STS	Active	5/12/2026
.NET 8	11/14/2023	8.0.11	11/12/2024	LTS	Active	11/10/2026

Program.cs

using Microsoft.Extensions.AI;
using Azure.AI.Inference;
using Azure;
using ChatRole = Microsoft.Extensions.AI.ChatRole;
using Microsoft.Data.Analysis;

IChatClient client =
    new ChatCompletionsClient(
        endpoint: new Uri("https://models.inference.ai.azure.com"), 
        new AzureKeyCredential(Environment.GetEnvironmentVariable("GH_TOKEN")))
        .AsChatClient("gpt-4o-mini");

var systemPrompt = 
    """
    You are a data entry AI assistant.

    You help users take data from screenshots and convert it into structured data.
    """;

var messages = new List<ChatMessage>
{
    new ChatMessage(ChatRole.System, systemPrompt),
    new ChatMessage(ChatRole.User, new AIContent[] {
        new ImageContent("https://gist.github.com/user-attachments/assets/92bc605d-7d63-4af7-82c9-f4c1887028ab", "image/jpeg"),
        new TextContent("Using this screenshot, extract the table data and format as CSV. Escape ',' separator so there are no conflicts with the CSV format."),
    })
};

var jsonResult = await client.CompleteAsync<DFResult>(messages, options: new ChatOptions {Temperature = 0.1f});

var res = jsonResult.Result;

var df = DataFrame.LoadCsvFromString(res.AIResult, header: res.HasHeader, separator: ',');

DataFrame.SaveCsv(df, "data.csv");

class DFResult
{
    public string AIResult { get; set; }

    public bool HasHeader { get; set; }
}