Azure Storage Blobs Samples

Upload a Blob (C#)

This sample demonstrates how to upload a block blob to Azure Storage.

using Azure.Storage.Blobs;
using Azure.Storage.Blobs.Models;
using System;
using System.IO;
using System.Threading.Tasks;

public class BlobUploadSample
{
    public static async Task UploadBlobAsync(string connectionString, string containerName, string blobName, string filePath)
    {
        // Create a BlobServiceClient object which will be used to create a container client
        BlobServiceClient blobServiceClient = new BlobServiceClient(connectionString);

        // Get a client that will be used to interact with a specific blob
        BlobContainerClient containerClient = blobServiceClient.GetBlobContainerClient(containerName);

        // Get a client that will be used to interact with a specific blob
        BlobClient blobClient = containerClient.GetBlobClient(blobName);

        using (FileStream uploadFileStream = File.OpenRead(filePath))
        {
            await blobClient.UploadAsync(uploadFileStream, true);
            Console.WriteLine($"Uploaded blob '{blobName}' to container '{containerName}' from file '{filePath}'.");
        }
    }

    public static async Task Main(string[] args)
    {
        // Replace with your actual connection string, container name, blob name, and file path
        string connectionString = Environment.GetEnvironmentVariable("AZURE_STORAGE_CONNECTION_STRING");
        string containerName = "my-blob-container";
        string blobName = "my-uploaded-blob.txt";
        string filePath = "path/to/your/local/file.txt";

        if (string.IsNullOrEmpty(connectionString))
        {
            Console.WriteLine("Please set the AZURE_STORAGE_CONNECTION_STRING environment variable.");
            return;
        }

        // Ensure the container exists (optional, but good practice)
        try
        {
            var containerClient = new BlobContainerClient(connectionString, containerName);
            await containerClient.CreateIfNotExistsAsync();
            Console.WriteLine($"Container '{containerName}' is ready.");
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Error creating or accessing container: {ex.Message}");
            return;
        }

        if (!File.Exists(filePath))
        {
            Console.WriteLine($"Error: File not found at '{filePath}'.");
            return;
        }

        await UploadBlobAsync(connectionString, containerName, blobName, filePath);
    }
}