From 4e07e65b4ce8012a8963ff02e07cb22a1aedd44c Mon Sep 17 00:00:00 2001
From: Marc Chouteau <marc@chouteau.info>
Date: Sat, 29 Aug 2026 14:49:23 +0200
Subject: [PATCH] ++

---
 .gitignore                                                 | 1 +
 .../Internal/ExportColumnResolver.cs                       | 7 +++++--
 .../SuperBlazorComponents.DataGridExporter.csproj          | 4 ++--
 3 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/.gitignore b/.gitignore
index ce89292..2ea4ac7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -416,3 +416,4 @@ FodyWeavers.xsd
 *.msix
 *.msm
 *.msp
+*.xlsx
diff --git a/src/SuperBlazorComponents.DataGridExporter/Internal/ExportColumnResolver.cs b/src/SuperBlazorComponents.DataGridExporter/Internal/ExportColumnResolver.cs
index ddcf3c9..e6cd7ac 100644
--- a/src/SuperBlazorComponents.DataGridExporter/Internal/ExportColumnResolver.cs
+++ b/src/SuperBlazorComponents.DataGridExporter/Internal/ExportColumnResolver.cs
@@ -1,4 +1,4 @@
-using System.Collections.Concurrent;
+using System.Collections.Concurrent;
 using System.Diagnostics;
 using System.Net;
 using System.Reflection;
@@ -20,6 +20,7 @@ public static IReadOnlyList<ExportColumn<TItem>> Resolve<TItem>(SuperDataGrid<TI
     {
         var result = new List<ExportColumn<TItem>>();
 
+        int idx = 0;
         foreach (var column in grid.ColumnsCollection.Where(c => c.Exportable && c.IsCurrentlyVisible))
         {
             var header = FirstNotEmpty(
@@ -31,9 +32,11 @@ public static IReadOnlyList<ExportColumn<TItem>> Resolve<TItem>(SuperDataGrid<TI
             if (string.IsNullOrWhiteSpace(header))
             {
                 throw new InvalidOperationException(
-                    "An exportable grid column has no resolvable header. Set ExportHeader on the column.");
+                    $"An exportable grid column has no resolvable header. Set ExportHeader on the column index {idx}.");
             }
 
+            idx++;
+
             Func<TItem, object?> accessor;
             if (column.ExportValue is not null)
             {
diff --git a/src/SuperBlazorComponents.DataGridExporter/SuperBlazorComponents.DataGridExporter.csproj b/src/SuperBlazorComponents.DataGridExporter/SuperBlazorComponents.DataGridExporter.csproj
index 33fb83a..47aaf72 100644
--- a/src/SuperBlazorComponents.DataGridExporter/SuperBlazorComponents.DataGridExporter.csproj
+++ b/src/SuperBlazorComponents.DataGridExporter/SuperBlazorComponents.DataGridExporter.csproj
@@ -1,11 +1,11 @@
-<Project Sdk="Microsoft.NET.Sdk.Razor">
+<Project Sdk="Microsoft.NET.Sdk.Razor">
   <PropertyGroup>
     <TargetFramework>net10.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <RootNamespace>SuperBlazorComponents.DataGridExporter</RootNamespace>
     <AssemblyName>SuperBlazorComponents.DataGridExporter</AssemblyName>
-    <VersionPrefix>2.0.9</VersionPrefix>
+    <VersionPrefix>2.0.10</VersionPrefix>
     <PackageId>SuperBlazorComponents.DataGridExporter</PackageId>
     <Title>SuperBlazorComponents DataGrid Exporter</Title>
     <Authors>Appliman</Authors>