Question

我正在使用joshclose的Csv Helper来编写csv文件。我使用了类映射。根据文档，我不需要在类映射中显式地忽略未使用的属性，因为csv helper将仅使用映射中提到的属性，但这不会发生。这是代码。

public sealed class ExportInvoicesCsvMap : CsvClassMap<Invoice>
    {
        public ExportInvoicesCsvMap()
        {
            Map(i => i.Number).Index(0).Name("Number");
            Map(i => i.SupplierName).Index(1).Name("Supplier Name");

        }
    }

这是我注册类映射的地方。

List<Invoice> result = _invoiceService.GetInvoices().ToList();// Getting 300 records

 var config = new CsvConfiguration();
 config.RegisterClassMap<ExportInvoicesCsvMap>();

_csvWriter = new CsvWriter(new CsvFileWriter(_fullPath), config);
_csvWriter.WriteRecords(result);
_csvWriter.Dispose();

但我仍然在csv中获得整个发票模型数据。

Answer 1

CsvHelper在不忽略属性的情况下进行修正。你可能会遗漏一些东西。请查看以下代码。

 public class Invoice
{
    public int Number { get; set; }
    public string SupplierName { get; set; }
    public int Amount { get; set; }
}

public sealed class ExportInvoicesCsvMap : CsvClassMap<Invoice>
{
    public ExportInvoicesCsvMap()
    {
        Map(i => i.Number).Index(0).Name("Number");
        Map(i => i.SupplierName).Index(1).Name("Supplier Name");

    }
}

        var config = new CsvConfiguration();
        config.RegisterClassMap<ExportInvoicesCsvMap>();
        List<Invoice> list = new List<Invoice>();
        list.Add(new Invoice
        {
            Number = 1,
            SupplierName = "SN",
            Amount=7
        });

        using (var sw = new StreamWriter(@"test.csv"))
        {
            var _csvWriter = new CsvWriter(sw, config);
            IEnumerable records = list;
            _csvWriter.WriteRecords(records);
        }

Csv Helper正在编写所有记录，甚至在课程映射之后

1 个答案: