Excel-Import

Services/WorkspaceService.cs

@@ -1,6 +1,8 @@
 using Microsoft.AspNetCore.Components.Authorization;
 using Raven.Client.Documents;
 using ZahlenAnalyse.Web.Models;
+using ExcelDataReader;
+using System.Data;
 
 namespace ZahlenAnalyse.Web.Services;
 
@@ -118,4 +120,43 @@ public class WorkspaceService
             .OrderByDescending(f => f.Date)
             .ToListAsync();
     }
+
+    public async Task ImportFromExcelAsync(string workspaceId, Stream fileStream)
+{
+    // Encoding für deutsche Excel-Dateien
+    System.Text.Encoding.RegisterProvider(System.Text.CodePagesEncodingProvider.Instance);
+
+    using var reader = ExcelReaderFactory.CreateReader(fileStream);
+    var result = reader.AsDataSet(new ExcelDataSetConfiguration() {
+        ConfigureDataTable = (_) => new ExcelDataTableConfiguration() { UseHeaderRow = true }
+    });
+
+    var dataTable = result.Tables[0];
+    
+    using var session = _store.OpenAsyncSession();
+    
+    foreach (DataRow row in dataTable.Rows)
+    {
+        var fakt = new AnalysisFakt
+        {
+            WorkspaceId = workspaceId,
+            Date = Convert.ToDateTime(row["Datum"]),
+            Amount = Convert.ToDecimal(row["Betrag"]),
+            // Hier mappen wir dynamisch die Dimensionen
+            Dimensions = new Dictionary<string, string>()
+        };
+
+        // Wir gehen davon aus, dass deine Excel-Spaltennamen 
+        // den Dimensions-Namen entsprechen
+        foreach (var col in dataTable.Columns.Cast<DataColumn>().Skip(2)) // Datum/Betrag überspringen
+        {
+            fakt.Dimensions[col.ColumnName] = row[col.ColumnName].ToString() ?? "";
+        }
+
+        await EnrichWithAuditDataAsync(fakt);
+        await session.StoreAsync(fakt);
+    }
+    
+    await session.SaveChangesAsync();
+}
 }