Add Blazor WebApp and rework data handling to utilize Entity Framework

2025-09-11 11:49:48 -04:00
parent 5220e61c79
commit 3daa3b81b3
111 changed files with 6039 additions and 946 deletions
@@ -0,0 +1,113 @@
+@page "/import"
+@using Core.Parsers
+@using Microsoft.EntityFrameworkCore
+@inject AppDbContext Context
+
+@rendermode InteractiveServer
+
+<PageTitle>Import Data</PageTitle>
+
+<h1>Import Data</h1>
+
+<h3>Events</h3>
+<InputFile OnChange="UploadEvents"></InputFile>
+    <text>@_events?.Length Events</text>
+<button class="btn btn-primary" @onclick="SaveEvents">Save to Database</button>
+<br/>
+
+<h3>Students</h3>
+<InputFile OnChange="UploadStudents"></InputFile>
+<text>@_students?.Length Students</text>
+<button class="btn btn-primary" @onclick="SaveStudents">Save to Database</button>
+
+@code {
+    private EventDefinition[]? _events;
+    private Student[]? _students;
+
+    async Task UploadEvents(InputFileChangeEventArgs arg)
+    {
+        await GetStreamReaderFromInputFile(arg, reader =>
+        {
+            var eventDefinitionParser = new EventDefinitionParser(reader);
+            _events = eventDefinitionParser.Parse();
+        });
+    }
+
+    async Task SaveEvents()
+    {
+        if (_events == null)
+            return;
+
+        foreach (var evt in _events)
+        {
+            // check if it already exists
+            var exists
+                = await Context.Events
+                    .FirstOrDefaultAsync(e => e.Name == evt.Name);
+            if (exists != null)
+                continue;
+            await Context.Events.AddAsync(evt);
+        }
+
+        await Context.SaveChangesAsync();
+    }
+
+    async Task UploadStudents(InputFileChangeEventArgs arg)
+    {
+        await GetStreamReaderFromInputFile(arg, reader =>
+        {
+            var studentParser = new StudentParser(reader);
+            _students = studentParser.Parse();
+        });
+    }
+
+    async Task SaveStudents()
+    {
+        if (_students == null)
+            return;
+
+        try
+        {
+            foreach (var student in _students)
+            {
+                // check if it already exists
+                var exists
+                    = await Context.Students
+                        .FirstOrDefaultAsync(e 
+                            => e.FirstName == student.FirstName 
+                               && e.LastName == student.LastName);
+                if (exists != null)
+                    continue;
+                await Context.Students.AddAsync(student);
+            }
+            await Context.SaveChangesAsync();
+        }
+        catch (Exception e)
+        {
+            Console.WriteLine(e);
+            throw;
+        }
+    }
+
+    static async Task GetStreamReaderFromInputFile(InputFileChangeEventArgs arg, Action<StreamReader> f)
+    {
+        StreamReader? streamReader = null;
+        try
+        {
+            var browserFile = arg.File;
+
+            await using var fs = browserFile.OpenReadStream();
+            await using var ms = new MemoryStream();
+
+            await fs.CopyToAsync(ms);
+            ms.Seek(0,0);
+            streamReader = new StreamReader(ms);
+            f(streamReader);
+        }
+        catch
+        {
+            streamReader?.Dispose();
+            throw;
+        }
+    }
+}