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Appmod/dotnet migration local file system to azure blob storage 20260416111945 #12

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d14e6d7
Add Azure.Storage.Blobs 12.24.0 package for blob storage support
Apr 15, 2026
77c4721
Add Azure Blob Storage configuration to Web.config
Apr 15, 2026
19b95af
Create BlobStorageService for Azure Blob Storage operations
Apr 15, 2026
a1e4845
Add BlobStorageService to BaseController
Apr 15, 2026
8a28866
Integrate Azure Blob Storage for course material images
Apr 16, 2026
379663d
Migrate CoursesController DeleteConfirmed action from local file syst…
Apr 16, 2026
8759fcd
Fix BlobStorageService to use connection string auth, add missing ass…
Apr 16, 2026
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61 changes: 49 additions & 12 deletions ContosoUniversity/ContosoUniversity.csproj
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Original file line number Diff line number Diff line change
Expand Up @@ -45,11 +45,59 @@
<WarningLevel>4</WarningLevel>
</PropertyGroup>
<ItemGroup>
<Reference Include="Azure.Storage.Blobs, Version=12.24.0.0, Culture=neutral, PublicKeyToken=92742159e12e44c8, processorArchitecture=MSIL">
<HintPath>packages\Azure.Storage.Blobs.12.24.0\lib\netstandard2.0\Azure.Storage.Blobs.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="Azure.Core, Version=1.44.1.0, Culture=neutral, PublicKeyToken=92742159e12e44c8, processorArchitecture=MSIL">
<HintPath>packages\Azure.Core.1.44.1\lib\netstandard2.0\Azure.Core.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="Microsoft.Bcl.AsyncInterfaces, Version=6.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
<HintPath>packages\Microsoft.Bcl.AsyncInterfaces.6.0.0\lib\net461\Microsoft.Bcl.AsyncInterfaces.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="System.ClientModel, Version=1.1.0.0, Culture=neutral, PublicKeyToken=92742159e12e44c8, processorArchitecture=MSIL">
<HintPath>packages\System.ClientModel.1.1.0\lib\netstandard2.0\System.ClientModel.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="System.Memory.Data, Version=6.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
<HintPath>packages\System.Memory.Data.6.0.0\lib\netstandard2.0\System.Memory.Data.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="Azure.Storage.Common, Version=12.23.0.0, Culture=neutral, PublicKeyToken=92742159e12e44c8, processorArchitecture=MSIL">
<HintPath>packages\Azure.Storage.Common.12.23.0\lib\netstandard2.0\Azure.Storage.Common.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="Microsoft.CSharp" />
<Reference Include="System" />
<Reference Include="System.Data" />
<Reference Include="System.Data.DataSetExtensions" />
<Reference Include="System.Diagnostics.DiagnosticSource, Version=6.0.0.1, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
<HintPath>packages\System.Diagnostics.DiagnosticSource.6.0.1\lib\net461\System.Diagnostics.DiagnosticSource.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="System.Drawing" />
<Reference Include="System.IO.Hashing, Version=6.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
<HintPath>packages\System.IO.Hashing.6.0.0\lib\net461\System.IO.Hashing.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="System.Runtime.CompilerServices.Unsafe, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
<HintPath>packages\System.Runtime.CompilerServices.Unsafe.6.0.0\lib\net461\System.Runtime.CompilerServices.Unsafe.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="System.Text.Encodings.Web, Version=6.0.0.1, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
<HintPath>packages\System.Text.Encodings.Web.6.0.1\lib\net461\System.Text.Encodings.Web.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="System.Text.Json, Version=6.0.0.11, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
<HintPath>packages\System.Text.Json.6.0.11\lib\net461\System.Text.Json.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="System.ValueTuple, Version=4.0.3.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
<HintPath>packages\System.ValueTuple.4.5.0\lib\net47\System.ValueTuple.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="System.Web.DynamicData" />
<Reference Include="System.Web.Entity" />
<Reference Include="System.Web.ApplicationServices" />
Expand Down Expand Up @@ -135,10 +183,6 @@
<HintPath>packages\Microsoft.Data.SqlClient.2.1.4\lib\net46\Microsoft.Data.SqlClient.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="Microsoft.Bcl.AsyncInterfaces">
<HintPath>packages\Microsoft.Bcl.AsyncInterfaces.1.1.1\lib\netstandard2.0\Microsoft.Bcl.AsyncInterfaces.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="System.Threading.Tasks.Extensions">
<HintPath>packages\System.Threading.Tasks.Extensions.4.5.4\lib\net461\System.Threading.Tasks.Extensions.dll</HintPath>
<Private>True</Private>
Expand Down Expand Up @@ -187,10 +231,6 @@
<HintPath>packages\Microsoft.Extensions.Primitives.3.1.32\lib\netstandard2.0\Microsoft.Extensions.Primitives.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="System.Diagnostics.DiagnosticSource">
<HintPath>packages\System.Diagnostics.DiagnosticSource.4.7.1\lib\net46\System.Diagnostics.DiagnosticSource.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="System.Collections.Immutable">
<HintPath>packages\System.Collections.Immutable.1.7.1\lib\netstandard2.0\System.Collections.Immutable.dll</HintPath>
<Private>True</Private>
Expand All @@ -199,10 +239,6 @@
<HintPath>packages\System.ComponentModel.Annotations.4.7.0\lib\net461\System.ComponentModel.Annotations.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="Microsoft.Identity.Client">
<HintPath>packages\Microsoft.Identity.Client.4.21.1\lib\net461\Microsoft.Identity.Client.dll</HintPath>
<Private>True</Private>
</Reference>
</ItemGroup>
<ItemGroup>
<Reference Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform">
Expand Down Expand Up @@ -242,6 +278,7 @@
<Compile Include="Models\SchoolViewModels\InstructorIndexData.cs" />
<Compile Include="PaginatedList.cs" />
<Compile Include="Properties\AssemblyInfo.cs" />
<Compile Include="Services\BlobStorageService.cs" />
<Compile Include="Services\NotificationService.cs" />
</ItemGroup>
<ItemGroup>
Expand Down
2 changes: 2 additions & 0 deletions ContosoUniversity/Controllers/BaseController.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@ public abstract class BaseController : Controller
{
protected SchoolContext db;
protected NotificationService notificationService = new NotificationService();
protected BlobStorageService blobStorageService = new BlobStorageService();

public BaseController()
{
Expand Down Expand Up @@ -41,6 +42,7 @@ protected override void Dispose(bool disposing)
{
db?.Dispose();
notificationService?.Dispose();
blobStorageService?.Dispose();
}
base.Dispose(disposing);
}
Expand Down
83 changes: 33 additions & 50 deletions ContosoUniversity/Controllers/CoursesController.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -54,7 +54,7 @@ public ActionResult Create([Bind(Include = "CourseID,Title,Credits,DepartmentID,
// Validate file type
var allowedExtensions = new[] { ".jpg", ".jpeg", ".png", ".gif", ".bmp" };
var fileExtension = Path.GetExtension(teachingMaterialImage.FileName).ToLower();

if (!allowedExtensions.Contains(fileExtension))
{
ModelState.AddModelError("teachingMaterialImage", "Please upload a valid image file (jpg, jpeg, png, gif, bmp).");
Expand All @@ -72,20 +72,16 @@ public ActionResult Create([Bind(Include = "CourseID,Title,Credits,DepartmentID,

try
{
// Create uploads directory if it doesn't exist
var uploadsPath = Server.MapPath("~/Uploads/TeachingMaterials/");
if (!Directory.Exists(uploadsPath))
{
Directory.CreateDirectory(uploadsPath);
}
// Generate unique blob name
var blobName = $"course_{course.CourseID}_{Guid.NewGuid()}{fileExtension}";

// Generate unique filename
var fileName = $"course_{course.CourseID}_{Guid.NewGuid()}{fileExtension}";
var filePath = Path.Combine(uploadsPath, fileName);
// Upload to Azure Blob Storage
var blobUri = blobStorageService.UploadBlobAsync(
teachingMaterialImage.InputStream,
blobName,
teachingMaterialImage.ContentType).Result;

// Save file
teachingMaterialImage.SaveAs(filePath);
course.TeachingMaterialImagePath = $"~/Uploads/TeachingMaterials/{fileName}";
course.TeachingMaterialImagePath = blobUri;
}
catch (Exception ex)
{
Expand All @@ -97,10 +93,10 @@ public ActionResult Create([Bind(Include = "CourseID,Title,Credits,DepartmentID,

db.Courses.Add(course);
db.SaveChanges();

// Send notification for course creation
SendEntityNotification("Course", course.CourseID.ToString(), course.Title, EntityOperation.CREATE);

return RedirectToAction("Index");
}

Expand Down Expand Up @@ -137,7 +133,7 @@ public ActionResult Edit([Bind(Include = "CourseID,Title,Credits,DepartmentID,Te
// Validate file type
var allowedExtensions = new[] { ".jpg", ".jpeg", ".png", ".gif", ".bmp" };
var fileExtension = Path.GetExtension(teachingMaterialImage.FileName).ToLower();

if (!allowedExtensions.Contains(fileExtension))
{
ModelState.AddModelError("teachingMaterialImage", "Please upload a valid image file (jpg, jpeg, png, gif, bmp).");
Expand All @@ -155,30 +151,22 @@ public ActionResult Edit([Bind(Include = "CourseID,Title,Credits,DepartmentID,Te

try
{
// Create uploads directory if it doesn't exist
var uploadsPath = Server.MapPath("~/Uploads/TeachingMaterials/");
if (!Directory.Exists(uploadsPath))
// Delete old blob if exists
if (!string.IsNullOrEmpty(course.TeachingMaterialImagePath))
{
Directory.CreateDirectory(uploadsPath);
blobStorageService.DeleteBlobAsync(course.TeachingMaterialImagePath).Wait();
}

// Generate unique filename
var fileName = $"course_{course.CourseID}_{Guid.NewGuid()}{fileExtension}";
var filePath = Path.Combine(uploadsPath, fileName);
// Generate unique blob name
var blobName = $"course_{course.CourseID}_{Guid.NewGuid()}{fileExtension}";

// Delete old file if exists
if (!string.IsNullOrEmpty(course.TeachingMaterialImagePath))
{
var oldFilePath = Server.MapPath(course.TeachingMaterialImagePath);
if (System.IO.File.Exists(oldFilePath))
{
System.IO.File.Delete(oldFilePath);
}
}
// Upload new blob to Azure Blob Storage
var blobUri = blobStorageService.UploadBlobAsync(
teachingMaterialImage.InputStream,
blobName,
teachingMaterialImage.ContentType).Result;

// Save new file
teachingMaterialImage.SaveAs(filePath);
course.TeachingMaterialImagePath = $"~/Uploads/TeachingMaterials/{fileName}";
course.TeachingMaterialImagePath = blobUri;
}
catch (Exception ex)
{
Expand All @@ -190,10 +178,10 @@ public ActionResult Edit([Bind(Include = "CourseID,Title,Credits,DepartmentID,Te

db.Entry(course).State = EntityState.Modified;
db.SaveChanges();

// Send notification for course update
SendEntityNotification("Course", course.CourseID.ToString(), course.Title, EntityOperation.UPDATE);

return RedirectToAction("Index");
}
ViewBag.DepartmentID = new SelectList(db.Departments, "DepartmentID", "Name", course.DepartmentID);
Expand Down Expand Up @@ -223,22 +211,17 @@ public ActionResult DeleteConfirmed(int id)
Course course = db.Courses.Find(id);
var courseTitle = course.Title;

// Delete associated image file if it exists
// Delete associated image from Azure Blob Storage if it exists
if (!string.IsNullOrEmpty(course.TeachingMaterialImagePath))
{
var filePath = Server.MapPath(course.TeachingMaterialImagePath);
if (System.IO.File.Exists(filePath))
try
{
try
{
System.IO.File.Delete(filePath);
}
catch (Exception ex)
{
// Log the error but don't prevent deletion of the course
// In a production application, you would log this error properly
System.Diagnostics.Debug.WriteLine($"Error deleting file: {ex.Message}");
}
blobStorageService.DeleteBlobAsync(course.TeachingMaterialImagePath).Wait();
}
catch (Exception ex)
{
// Log the error but don't prevent deletion of the course
System.Diagnostics.Debug.WriteLine($"Error deleting blob: {ex.Message}");
}
}

Expand Down
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