From 00cb290649ae999a1c76e3106d46a366a244eb36 Mon Sep 17 00:00:00 2001
From: "Jade.VAN_BRABANDT" <Jade.VAN_BRABANDT@etu.uca.fr>
Date: Thu, 14 Dec 2023 13:53:27 +0100
Subject: [PATCH] Feat : Finished CSV export, code might not be clean

---
 Blazor/Blazor/Pages/Chapters.razor    |  2 ++
 Blazor/Blazor/Pages/Chapters.razor.cs | 19 +++++++------------
 Blazor/Blazor/Pages/Chapters.razor.js | 11 +++++++++++
 3 files changed, 20 insertions(+), 12 deletions(-)
 create mode 100644 Blazor/Blazor/Pages/Chapters.razor.js

diff --git a/Blazor/Blazor/Pages/Chapters.razor b/Blazor/Blazor/Pages/Chapters.razor
index 4bdef15..d9df7c8 100644
--- a/Blazor/Blazor/Pages/Chapters.razor
+++ b/Blazor/Blazor/Pages/Chapters.razor
@@ -12,3 +12,5 @@
     <DataGridColumn TItem="ChaptersModel" Field="@nameof(ChaptersModel.Id)" Caption="#" />
     <DataGridColumn TItem="ChaptersModel" Field="@nameof(ChaptersModel.Name)" Caption="Name" />
 </DataGrid>
+
+<script src="Pages/Chapters.razor.js"></script>
\ No newline at end of file
diff --git a/Blazor/Blazor/Pages/Chapters.razor.cs b/Blazor/Blazor/Pages/Chapters.razor.cs
index d577b97..7e481e2 100644
--- a/Blazor/Blazor/Pages/Chapters.razor.cs
+++ b/Blazor/Blazor/Pages/Chapters.razor.cs
@@ -3,7 +3,7 @@ using Blazored.LocalStorage;
 using Blazorise.DataGrid;
 using ChoETL;
 using Microsoft.AspNetCore.Components;
-using System.Reflection.Metadata;
+using Microsoft.JSInterop;
 using System.Text;
 
 namespace Blazor.Pages;
@@ -25,6 +25,9 @@ public partial class Chapters
     [Inject]
     public NavigationManager NavigationManager { get; set; }
 
+    [Inject]
+    public IJSRuntime IJSRuntime { get; set; }
+
     protected override async Task OnAfterRenderAsync(bool firstRender)
     {
         // Do not treat this action if is not the first render
@@ -75,19 +78,11 @@ public partial class Chapters
             }
         }
 
+        var sentFile = new MemoryStream(Encoding.ASCII.GetBytes(sb.ToString()));
 
-
-        string path = @"C:\temp\file"; // path to file
-        using (FileStream fs = File.Create(path))
+        using (var streamRef = new DotNetStreamReference(stream: sentFile))
         {
-            // writing data in string
-            byte[] info = new UTF8Encoding(true).GetBytes(sb.ToString());
-            fs.Write(info, 0, info.Length);
-
-            // writing data in bytes already
-            byte[] data = new byte[] { 0x0 };
-            fs.Write(data, 0, data.Length);
+            await IJSRuntime.InvokeVoidAsync("downloadFileFromStream", "data.csv", streamRef);
         }
-
     }
 }
\ No newline at end of file
diff --git a/Blazor/Blazor/Pages/Chapters.razor.js b/Blazor/Blazor/Pages/Chapters.razor.js
new file mode 100644
index 0000000..37f904d
--- /dev/null
+++ b/Blazor/Blazor/Pages/Chapters.razor.js
@@ -0,0 +1,11 @@
+window.downloadFileFromStream = async (fileName, contentStreamReference) => {
+    const arrayBuffer = await contentStreamReference.arrayBuffer();
+    const blob = new Blob([arrayBuffer]);
+    const url = URL.createObjectURL(blob);
+    const anchorElement = document.createElement('a');
+    anchorElement.href = url;
+    anchorElement.download = fileName ?? '';
+    anchorElement.click();
+    anchorElement.remove();
+    URL.revokeObjectURL(url);
+}
\ No newline at end of file