Initial commit

Services/Export/WebExportService.cs

@@ -0,0 +1,28 @@
+using System.Text;
+using Microsoft.AspNetCore.Components;
+using Microsoft.JSInterop;
+
+namespace SharepointToolbox.Web.Services.Export;
+
+/// <summary>
+/// Triggers browser file downloads from Blazor Server components.
+/// Converts string export outputs to bytes and invokes JS download.
+/// </summary>
+public class WebExportService
+{
+    private readonly IJSRuntime _js;
+
+    public WebExportService(IJSRuntime js) { _js = js; }
+
+    public async Task DownloadCsvAsync(string content, string fileName)
+    {
+        var bytes = new UTF8Encoding(encoderShouldEmitUTF8Identifier: true).GetBytes(content);
+        await _js.InvokeVoidAsync("sptb.downloadFile", fileName, "text/csv;charset=utf-8", Convert.ToBase64String(bytes));
+    }
+
+    public async Task DownloadHtmlAsync(string content, string fileName)
+    {
+        var bytes = new UTF8Encoding(encoderShouldEmitUTF8Identifier: false).GetBytes(content);
+        await _js.InvokeVoidAsync("sptb.downloadFile", fileName, "text/html;charset=utf-8", Convert.ToBase64String(bytes));
+    }
+}