Question

我无法使用主要详细记录来处理泛型。我的代码如下

// Setup file engine with Master/Detail types
MasterDetailEngine<PurchaseOrderHeader, PurchaseOrderLine> engine = new MasterDetailEngine<PurchaseOrderHeader, PurchaseOrderLine>(CommonSelector.MasterIfBegins, "H");

// Init the Master/Detail
MasterDetails<PurchaseOrderHeader, PurchaseOrderLine> poRecs = new MasterDetails<PurchaseOrderHeader, PurchaseOrderLine>();

// Setup list for detail lines & populate with test data
List<PurchaseOrderLine> poLines = new List<PurchaseOrderLine>();

for (int i = 1; i <= 5; i++)
{
    poLines.Add(new PurchaseOrderLine() { LineMarker = "L", LineNumber = i, ItemCode = "TestCode", Price = 12.34M, Quantity = i * 2, UOM = "EA" });
}

// Attach records to Master/Detail
poRecs.Master = new PurchaseOrderHeader() { LineMarker = "H", PayloadID = "3223232@ariba.acme.com", CustomerPO = "DO1234", ShipToAddressCode = "ShipToAddressCode", BillToAddressCode = "BillToAddressCode" };
poRecs.Details = poLines.ToArray();

// Write file
engine.WriteFile("SampleFile.txt", poRecs);

我收到以下编译错误：

CS1502：最佳重载方法匹配   FileHelpers.MasterDetail.MasterDetailEngine<ImportExport.PurchaseOrderHeader,ImportExport.PurchaseOrderLine>.WriteFile(string,System.Collections.Generic.IEnumerable<FileHelpers.MasterDetail.MasterDetails<ImportExport.PurchaseOrderHeader,ImportExport.PurchaseOrderLine>>)

有一些无效的论点。

我已尝试将poRecs投射到IEnumerable，但仍然无效。

任何建议都将不胜感激！

Answer 1

看起来WriteFile的调用需要IEnumerable<MasterDetails<PurchaseOrderHeader, PurchaseOrderLine>>，而您只是传递MasterDetails<PurchaseOrderHeader, PurchaseOrderLine>。

当然，您无法将MasterDetails投射到IEnumerable，因为这些不可转换。您需要做的是用poRecs包裹IEnumerable。请尝试以下方法：

engine.WriteFile("SampleFile.txt", new[] { poRecs });

使用泛型的FileHelpers主/详细记录

1 个答案: