1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
// 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 CsvHelper.Configuration;
using CsvHelper.TypeConversion;
using System;
using System.Linq.Expressions;
namespace CsvHelper.Expressions
{
/// <summary>
/// Creates primitive records.
/// </summary>
public class PrimitiveRecordCreator : RecordCreator
{
/// <summary>
/// Initializes a new instance using the given reader.
/// </summary>
/// <param name="reader">The reader.</param>
public PrimitiveRecordCreator(CsvReader reader) : base(reader) { }
/// <summary>
/// Creates a <see cref="Delegate"/> of type <see cref="Func{T}"/>
/// that will create a record of the given type using the current
/// reader row.
/// </summary>
/// <param name="recordType">The record type.</param>
protected override Delegate CreateCreateRecordDelegate(Type recordType)
{
var method = typeof(IReaderRow).GetProperty("Item", typeof(string), new[] { typeof(int) }).GetGetMethod();
Expression fieldExpression = Expression.Call(Expression.Constant(Reader), method, Expression.Constant(0, typeof(int)));
var memberMapData = new MemberMapData(null)
{
Index = 0,
TypeConverter = Reader.Context.TypeConverterCache.GetConverter(recordType)
};
memberMapData.TypeConverterOptions = TypeConverterOptions.Merge(new TypeConverterOptions { CultureInfo = Reader.Configuration.CultureInfo }, Reader.Context.TypeConverterOptionsCache.GetOptions(recordType));
fieldExpression = Expression.Call(Expression.Constant(memberMapData.TypeConverter), "ConvertFromString", null, fieldExpression, Expression.Constant(Reader), Expression.Constant(memberMapData));
fieldExpression = Expression.Convert(fieldExpression, recordType);
var funcType = typeof(Func<>).MakeGenericType(recordType);
return Expression.Lambda(funcType, fieldExpression).Compile();
}
}
}
|
