Create CSVDownloadService

Author: EthanHair

src/AstroPanda.Blazor.Toolkit/AstroPanda.Blazor.Toolkit.csproj

@@ -8,7 +8,8 @@
 
   <ItemGroup>
     <PackageReference Include="BlazorComponentBus" Version="2.2.0" />
-    <PackageReference Include="Blazored.LocalStorage" Version="4.5.0" />    
+    <PackageReference Include="Blazored.LocalStorage" Version="4.5.0" />
+    <PackageReference Include="CsvHelper" Version="33.1.0" />    
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == 'net8.0'">

src/AstroPanda.Blazor.Toolkit/Services/CSVDownloadService.cs

@@ -0,0 +1,20 @@
+using System.Text;
+
+namespace AstroPanda.Blazor.Toolkit.Services;
+
+public class CSVDownloadService<T>(IDownloadService _downloads) : ICSVDownloadService<T>
+{
+    public async Task DownloadLocalAsync(string fileName, IEnumerable<T> collection)
+    {
+        using var stringWriter = new StringWriter();
+        using var csvWriter = new CsvHelper.CsvWriter(stringWriter, System.Globalization.CultureInfo.InvariantCulture, true);
+
+        csvWriter.WriteHeader<T>();
+        csvWriter.NextRecord();
+        csvWriter.WriteRecords(collection);
+
+        using var receivingStream = new MemoryStream(Encoding.UTF8.GetBytes(stringWriter.ToString()));
+
+        await _downloads.DownloadLocalAsync(fileName, receivingStream);
+    }
+}

src/AstroPanda.Blazor.Toolkit/Services/ICSVDownloadService.cs

@@ -0,0 +1,6 @@
+namespace AstroPanda.Blazor.Toolkit.Services;
+
+public interface ICSVDownloadService<T>
+{
+    public Task DownloadLocalAsync(string fileName, IEnumerable<T> collection);
+}