在Lambda foreach中實例化類和調用方法

Question

是否可以在ForEach lambda表達式中執行此操作？

reports.ForEach(x => new PublishReport(x)
      PublishReport.PublishReports());

我想做的是實例化PublishReport（帶有類和方法名的類）類，該類傳遞一個報告對象，然后調用PublishReport類的PublishReports方法。

我所做的工作是：

reports.ForEach(x => CallPublishReports(x));

private void CallPublishReport(Report report)
{
    PublishReport publishReport = new PublishReport(report);
    publishReport.PublishReports();
}

Answer 1

您要查找的代碼如下所示：

reports.ForEach(x => (new PublishReport(x)).PublishReport());

要么

reports.ForEach(x => {
    var report = new PublishReport(x);
    report.PublishReports();
});

您也可以用Select替換ForEach ，因為前者僅存在於PLINQ afaik中。

Answer 2

您可以先使用Select創建實例，然后對它們進行ForEach ，如下所示：

reports
    .Select(r => new PublishReport(r))
    .ForEach(pr => pr.PublishReports());

Answer 3

只需給lambda一個身體即可：

reports.ForEach(x => 
{
    PublishReport publishReport = new PublishReport(x);
    publishReport.PublishReports();
});