azure - Uploads folder in wwwroot doesn't have access to delete a file by the app - Stack Overflow

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I have an Uploads folder in an App Service and uploading is successful.

However, when the app tries to delete the uploaded files, it encounters the error:

System.IO.IOException: Invalid access to memory location. : 'C:\home\site\wwwroot\wwwroot\sample\uploads\MyFile.txt'

I see the structure to be: myapp.scm.azurewebsites/dev/wwwroot/wwwroot/sample/uploads/MyFile.txt

private readonly string myUploadFolderPath = Path.Combine(Directory.GetCurrentDirectory(), "wwwroot", configuration["mySettings:UploadsFolderPath"]);

public bool RemoveUploadedFiles() {
    if (Directory.Exists(myUploadFolderPath)) {
        string[] files = Directory.GetFiles(myUploadFolderPath);

        foreach (string file in files) {
            File.Delete(file);
        }   
        return true;
    }
    
    return false;
}

we have a pipeline in Azure Devops to deploy, what deployment settings to be used for write permission to be enabled.

- task: DotNetCoreCLI@2
  inputs:
    command: publish
    publishWebProjects: true
    arguments: '--configuration $(BuildConfiguration) --output $(Build.ArtifactStagingDirectory)'
    #zipAfterPublish: true # commented    

# this code takes all the files in $(Build.ArtifactStagingDirectory) and uploads them as an artifact of your build.

- task: AzureWebApp@1
  condition: and(succeeded(), eq(variables['Build.SourceBranch'], 'refs/heads/main'))
  inputs:
    azureSubscription: 'ZOMWE(3e562eb-g31f-4241-579f-2c3e460354a1)'
    appType: 'webApp'
    appName: 'azvcx'
    package: '$(Build.ArtifactStagingDirectory)'  # added
    deploymentMethod: 'auto'

I have an Uploads folder in an App Service and uploading is successful.

However, when the app tries to delete the uploaded files, it encounters the error:

System.IO.IOException: Invalid access to memory location. : 'C:\home\site\wwwroot\wwwroot\sample\uploads\MyFile.txt'

I see the structure to be: myapp.scm.azurewebsites/dev/wwwroot/wwwroot/sample/uploads/MyFile.txt

private readonly string myUploadFolderPath = Path.Combine(Directory.GetCurrentDirectory(), "wwwroot", configuration["mySettings:UploadsFolderPath"]);

public bool RemoveUploadedFiles() {
    if (Directory.Exists(myUploadFolderPath)) {
        string[] files = Directory.GetFiles(myUploadFolderPath);

        foreach (string file in files) {
            File.Delete(file);
        }   
        return true;
    }
    
    return false;
}

we have a pipeline in Azure Devops to deploy, what deployment settings to be used for write permission to be enabled.

- task: DotNetCoreCLI@2
  inputs:
    command: publish
    publishWebProjects: true
    arguments: '--configuration $(BuildConfiguration) --output $(Build.ArtifactStagingDirectory)'
    #zipAfterPublish: true # commented    

# this code takes all the files in $(Build.ArtifactStagingDirectory) and uploads them as an artifact of your build.

- task: AzureWebApp@1
  condition: and(succeeded(), eq(variables['Build.SourceBranch'], 'refs/heads/main'))
  inputs:
    azureSubscription: 'ZOMWE(3e562eb-g31f-4241-579f-2c3e460354a1)'
    appType: 'webApp'
    appName: 'azvcx'
    package: '$(Build.ArtifactStagingDirectory)'  # added
    deploymentMethod: 'auto'

• azure
• blazor
• azure-appservice

Share Improve this question Follow edited Nov 20, 2024 at 13:28 John asked Nov 19, 2024 at 8:57 JohnJohn 73311 gold badge1313 silver badges3939 bronze badges 10

• Please share more details. – Sirra Sneha Commented Nov 19, 2024 at 9:05
• Please share the code that you've tried. – Sirra Sneha Commented Nov 19, 2024 at 9:06
• Are you sure the path is correct? – Sirra Sneha Commented Nov 19, 2024 at 9:11
• 1 what is the framework of your app (node.js,react, asp) – Sirra Sneha Commented Nov 19, 2024 at 9:16
• 1 ok will try and let you know – Sirra Sneha Commented Nov 19, 2024 at 9:28

 |  Show 5 more comments

1 Answer 1

Sorted by: Reset to default 0

I created a sample Blazor application, and I can successfully upload and delete the file from the folder without any issues.

Make sure you add correct upload path in your appsettings.json file.

appsettings.json:

{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft.AspNetCore": "Warning"
    }
  },
  "AllowedHosts": "*",
  "UploadFolderPath": "sample/uploads" 
}

I used asynchronous deletion as this prevents the blocking and makes the application more responsive.

My complete FileService.cs

using System;
using System.IO;
using System.Threading.Tasks;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;

namespace FileUploadApp.Services
{
    public class FileService
    {
        private readonly string _uploadFolderPath;
        private readonly ILogger<FileService> _logger;

        public FileService(IConfiguration configuration, ILogger<FileService> logger)
        {
            _logger = logger ?? throw new ArgumentNullException(nameof(logger)); 
        
            var uploadFolderPathConfig = configuration["UploadFolderPath"];

            if (string.IsNullOrEmpty(uploadFolderPathConfig))
            {
                throw new ArgumentNullException(nameof(uploadFolderPathConfig), "Upload folder path cannot be null or empty.");
            }

            _uploadFolderPath = Path.Combine(Directory.GetCurrentDirectory(), "wwwroot", uploadFolderPathConfig);

            _logger.LogInformation($"Upload folder path: {_uploadFolderPath}");

            if (!Directory.Exists(_uploadFolderPath))
            {
                Directory.CreateDirectory(_uploadFolderPath);
                _logger.LogInformation("Created upload folder.");
            }
        }

        public async Task<bool> UploadFile(Stream fileStream, string fileName)
        {
            try
            {
                if (string.IsNullOrEmpty(_uploadFolderPath))
                {
                    _logger.LogError("Upload folder path is null or empty.");
                    return false;
                }

                var filePath = Path.Combine(_uploadFolderPath, fileName);
                _logger.LogInformation($"Uploading file to {filePath}");

                using (var file = new FileStream(filePath, FileMode.Create))
                {
                    await fileStream.CopyToAsync(file);
                }

                _logger.LogInformation("File uploaded successfully.");
                return true;
            }
            catch (Exception ex)
            {
                _logger.LogError($"Error uploading file: {ex.Message}");
                return false;
            }
        }

        public async Task<bool> RemoveUploadedFiles()
        {
            try
            {
 
                if (Directory.Exists(_uploadFolderPath))
                {
                    var files = Directory.GetFiles(_uploadFolderPath);
                    foreach (var file in files)
                    {
                        await Task.Run(() => File.Delete(file));  
                    }
                    return true;
                }
                return false;
            }
            catch (Exception ex)
            {
                _logger.LogError($"Error deleting files: {ex.Message}");
                return false;
            }
        }
    }
}

Filedelete.razor:

@page "/file-delete"
@using FileUploadApp.Services
@inject FileService FileService

<h3>Delete Uploaded Files</h3>

<button @onclick="DeleteFiles">Delete All Files</button>
<p>@statusMessage</p>

@code {
    private string statusMessage;

    private async Task DeleteFiles()
    {
        var success = await FileService.RemoveUploadedFiles();

        statusMessage = success ? "All files deleted successfully!" : "Failed to delete files.";
    }
}

Output after deployment:

After successfully uploading the file, we can view the file in kudu by navigating to Site -> wwwroot - > wwwroot -> sample -> uploads.

Here I've successfully deleted the files and below you can see there are no files in my kudu console.

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