Added check to OpenXmlValueExtractor to eclude indexers from property mapping

src/MiniExcel.OpenXml/Templates/OpenXmlValueExtractor.cs

@@ -20,8 +20,10 @@ public class OpenXmlValueExtractor : IInputValueExtractor
     {
         var type = valueObject.GetType();
 
+        //todo: consider throwing an exception if a property has indexer instead of silently ignoring it
         var propertyValues = type
             .GetProperties(BindingFlags.Public | BindingFlags.Instance)
+            .Where(property => property.CanRead && property.GetIndexParameters().Length == 0)
             .Select(property => new { property.Name, Value = property.GetValue(valueObject) });
 
         var fieldValues = type

src/MiniExcel.OpenXml/Utils/CalcChainHelper.cs

@@ -2,19 +2,18 @@
 
 internal static partial class CalcChainHelper
 {
-
 	// The calcChain.xml file in an Excel file (in the xl folder) is an XML file that stores the calculation chain for the workbook.
 	// The calculation chain specifies the order in which cells should be recalculated in order to update all formulas in the workbook correctly.
 	// It should include a series of <c> elements, each of which represents a cell in the workbook that contains a formula.
 	//      Each <c> element should have a r attribute that specifies the cell's address (e.g., "A1" or "B2").
 	//      The  <c> element should also have a i attribute that specifies the index of the formula in the formulas collection (in the workbook's sheet data file).
 	// https://learn.microsoft.com/en-us/dotnet/api/documentformat.openxml.spreadsheet.calculationchain?view=openxml-2.8.1
-	public static string GetCalcChainContent( List<string> cellRefs, int sheetIndex ) {
-
+	public static string GetCalcChainContent(List<string> cellRefs, int sheetIndex ) 
+	{
 		var calcChainContent = new StringBuilder();
 		foreach (var cr in cellRefs) 
 		{
-			calcChainContent.Append($"""<c r="{cr}" i="{sheetIndex}"/>""" );
+			calcChainContent.Append($"""<c r="{cr}" i="{sheetIndex}"/>""");
 		}
 
 		return calcChainContent.ToString();
@@ -23,11 +22,15 @@ public static string GetCalcChainContent( List<string> cellRefs, int sheetIndex
 	[CreateSyncVersion]
 	public static async Task GenerateCalcChainSheetAsync(Stream calcChainStream, string calcChainContent, CancellationToken cancellationToken = default)
 	{
+		var content = $"<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?><calcChain xmlns=\"http://schemas.openxmlformats.org/spreadsheetml/2006/main\">{calcChainContent}</calcChain>";
+
+#if NET8_0_OR_GREATER
+		var writer = new StreamWriter(calcChainStream, Encoding.UTF8);
+		await using var disposableWriter = writer.ConfigureAwait(false);
+		await writer.WriteAsync(content.AsMemory(), cancellationToken).ConfigureAwait(false);
+	#else
 		using var writer = new StreamWriter(calcChainStream, Encoding.UTF8);
-		await writer.WriteAsync($"""<?xml version="1.0" encoding="UTF-8" standalone="yes"?><calcChain xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main">{calcChainContent}</calcChain>"""
-#if NET7_0_OR_GREATER
-			.AsMemory(), cancellationToken
-#endif
-		).ConfigureAwait(false);
+		await writer.WriteAsync(content).ConfigureAwait(false);
+	#endif
 	}
 }

tests/MiniExcel.OpenXml.Tests/MiniExcelIssueAsyncTests.cs

@@ -1476,4 +1476,32 @@ private class Issue138ExcelRow
         public double? 波段 { get; set; }
         public double? 當沖 { get; set; }
     }
+
+    [Fact]
+    public async Task TestIssue951()
+    {
+        var templatePath = PathHelper.GetFile("xlsx/TestTemplateEasyFill.xlsx");
+        using var path = AutoDeletingPath.Create();
+
+        var value = new Issue951
+        {
+            Name = "Jack",
+            CreateDate = new DateTime(2021, 01, 01),
+            VIP = true,
+            Points = 123
+        };
+
+        // must not throw
+        await _excelTemplater.FillTemplateAsync(path.ToString(), templatePath, value);
+    }
+
+    class Issue951
+    {
+        public string? Name { get; set; }
+        public DateTime CreateDate { get; set; }
+        public bool VIP { get; set; }
+        public double Points { get; set; }
+
+        public object this[string test] => new();
+    }
 }

tests/MiniExcel.OpenXml.Tests/MiniExcelIssueTests.cs

@@ -3827,4 +3827,32 @@ public void TestIssue915()
         Assert.Equal(7.4, result[1].Altitude);
         Assert.Equal(8.6, result[2].Altitude);
     }
+
+    [Fact]
+    public void TestIssue951()
+    {
+        var templatePath = PathHelper.GetFile("xlsx/TestTemplateEasyFill.xlsx");
+        using var path = AutoDeletingPath.Create();
+
+        var value = new Issue951
+        {
+            Name = "Jack",
+            CreateDate = new DateTime(2021, 01, 01),
+            VIP = true,
+            Points = 123
+        };
+
+        // must not throw
+        _excelTemplater.FillTemplate(path.ToString(), templatePath, value);
+    }
+
+    class Issue951
+    {
+        public string? Name { get; set; }
+        public DateTime CreateDate { get; set; }
+        public bool VIP { get; set; }
+        public double Points { get; set; }
+
+        public object this[string test] => new();
+    }
 }