diff options
author | chai <215380520@qq.com> | 2023-05-12 09:24:40 +0800 |
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committer | chai <215380520@qq.com> | 2023-05-12 09:24:40 +0800 |
commit | 2a1cd4fda8a4a8e649910d16b4dfa1ce7ae63543 (patch) | |
tree | a471fafed72e80b4ac3ac3002e06c34220dd6058 /ThirdParty/CsvHelper-master/src/CsvHelper/Expressions/PrimitiveRecordCreator.cs | |
parent | b8a694746562b37dc8dc5b8b5aec8612bb0964fc (diff) |
*misc
Diffstat (limited to 'ThirdParty/CsvHelper-master/src/CsvHelper/Expressions/PrimitiveRecordCreator.cs')
-rw-r--r-- | ThirdParty/CsvHelper-master/src/CsvHelper/Expressions/PrimitiveRecordCreator.cs | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/ThirdParty/CsvHelper-master/src/CsvHelper/Expressions/PrimitiveRecordCreator.cs b/ThirdParty/CsvHelper-master/src/CsvHelper/Expressions/PrimitiveRecordCreator.cs new file mode 100644 index 0000000..3e1cfd0 --- /dev/null +++ b/ThirdParty/CsvHelper-master/src/CsvHelper/Expressions/PrimitiveRecordCreator.cs @@ -0,0 +1,49 @@ +// 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(); + } + } +} |