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// Copyright 2009-2022 Josh Close
// This file is a part of CsvHelper and is dual licensed under MS-PL and Apache 2.0.
// See LICENSE.txt for details or visit http://www.opensource.org/licenses/ms-pl.html for MS-PL and http://opensource.org/licenses/Apache-2.0 for Apache 2.0.
// https://github.com/JoshClose/CsvHelper
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Text;
using CsvHelper.Configuration;
using Xunit;
namespace CsvHelper.Tests
{
public class CsvWriterReferenceMappingTests
{
[Fact]
public void NestedReferencesTest()
{
using (var stream = new MemoryStream())
using (var reader = new StreamReader(stream))
using (var writer = new StreamWriter(stream))
using (var csv = new CsvWriter(writer, CultureInfo.InvariantCulture))
{
csv.Context.RegisterClassMap<AMap>();
var list = new List<A>();
for (var i = 0; i < 4; i++)
{
var row = i + 1;
list.Add(
new A
{
Id = "a" + row,
B = new B
{
Id = "b" + row,
C = new C
{
Id = "c" + row,
D = new D
{
Id = "d" + row
}
}
}
});
};
csv.WriteRecords(list);
writer.Flush();
stream.Position = 0;
var data = reader.ReadToEnd();
var expected = new TestStringBuilder(csv.Configuration.NewLine);
expected.AppendLine("AId,BId,CId,DId");
expected.AppendLine("a1,b1,c1,d1");
expected.AppendLine("a2,b2,c2,d2");
expected.AppendLine("a3,b3,c3,d3");
expected.AppendLine("a4,b4,c4,d4");
Assert.Equal(expected.ToString(), data);
}
}
[Fact]
public void NullReferenceTest()
{
using (var stream = new MemoryStream())
using (var reader = new StreamReader(stream))
using (var writer = new StreamWriter(stream))
using (var csv = new CsvWriter(writer, CultureInfo.InvariantCulture))
{
csv.Context.RegisterClassMap<AMap>();
var list = new List<A>
{
new A
{
Id = "1",
}
};
csv.WriteRecords(list);
writer.Flush();
stream.Position = 0;
var data = reader.ReadToEnd();
var expected = new TestStringBuilder(csv.Configuration.NewLine);
expected.AppendLine("AId,BId,CId,DId");
expected.AppendLine("1,,,");
Assert.Equal(expected.ToString(), data);
}
}
private class A
{
public string Id { get; set; }
public B B { get; set; }
}
private class B
{
public string Id { get; set; }
public C C { get; set; }
}
private class C
{
public string Id { get; set; }
public D D { get; set; }
}
private class D
{
public string Id { get; set; }
}
private sealed class AMap : ClassMap<A>
{
public AMap()
{
Map(m => m.Id).Name("AId");
References<BMap>(m => m.B);
}
}
private sealed class BMap : ClassMap<B>
{
public BMap()
{
Map(m => m.Id).Name("BId");
References<CMap>(m => m.C);
}
}
private sealed class CMap : ClassMap<C>
{
public CMap()
{
Map(m => m.Id).Name("CId");
References<DMap>(m => m.D);
}
}
private sealed class DMap : ClassMap<D>
{
public DMap()
{
Map(m => m.Id).Name("DId");
}
}
}
}
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