Nested object processing interfered with custom mapping. I have added a fix for this scenario. Here's how you can specify the custom mapping:

ExcelMapper/ExcelMapper.Tests/Tests.cs

Lines 2318 to 2338 in e8fc469

    
           [Test] 
        
           public void StringArrayTest() 
        
           { 
        
               var excel = new ExcelMapper("../../../ProductsJson.xlsx"); 
        
               excel.AddMapping<ProductStringArray>("Product", p => p.Products) 
        
                   .SetCellUsing((c, o) => 
        
                   { 
        
                       if (o is string[] s) c.SetCellValue(string.Join(",", s)); 
        
                       else c.SetCellValue((string)null); 
        
                   }) 
        
                   .SetPropertyUsing(v => 
        
                   { 
        
                       if (v is string s) return s.Split(','); 
        
                       else return Array.Empty<string>(); 
        
                   }); 
        
               var ps = excel.Fetch<ProductStringArray>().ToList(); 
        
               Assert.AreEqual(3, ps.Count); 
        
               Assert.True(ps.All(p => p.Products.Length == 4)); 
        
           }

	[Test]
	public void StringArrayTest()
	{
	var excel = new ExcelMapper("../../../ProductsJson.xlsx");
	excel.AddMapping<ProductStringArray>("Product", p => p.Products)
	.SetCellUsing((c, o) =>
	{
	if (o is string[] s) c.SetCellValue(string.Join(",", s));
	else c.SetCellValue((string)null);
	})
	.SetPropertyUsing(v =>
	{
	if (v is string s) return s.Split(',');
	else return Array.Empty<string>();
	});

	var ps = excel.Fetch<ProductStringArray>().ToList();

	Assert.AreEqual(3, ps.Count);
	Assert.True(ps.All(p => p.Products.Length == 4));
	}

Yet another question about custom mapping #130

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