Question

我有这个

foreach (FileInfo flInfo in dir.GetFiles())
            {
                String name = flInfo.Name;
                Console.WriteLine("{0, -30:g} ", name);
                Task<DataTable> mergeTable = processFile(name);
                 table.Merge(mergeTable.Result);
            }

如何使用不同的变量mergeTable循环此任务？

更具体地说明我要的是什么目前，我正在这样做。

Task<DataTable> mergeTable01 = processFile("filename1.txt");
Task<DataTable> mergeTable02 = processFile("filename2.txt");
Task<DataTable> mergeTable03 = processFile("filename3.txt");
Task<DataTable> mergeTable04 = processFile("filename4.txt");

Task.WaitAll(mergeTable01,mergeTable02,mergeTable03,mergeTable04);

table.Merge(mergeTable01.Result);
table.Merge(mergeTable02.Result);
table.Merge(mergeTable03.Result);
table.Merge(mergeTable04.Result);

如何循环执行此重复任务并最终合并数据表？

Answer 1

如果您要触发所有任务以异步处理，则需要按照Kevin的说法启动并将它们添加到List<Task<T>>中，然后在该集合上调用Task.WhenAll。

List<Task<DataTable>> dataTableTasks = new List<Task<DataTable>>();
foreach (FileInfo flInfo in dir.GetFiles())
{
    String name = flInfo.Name;
    Console.WriteLine("{0, -30:g} ", name);
    Task<DataTable> mergeTable = processFile(name);
    dataTableTasks.Add(mergeTable);
}

await Task.WhenAll(dataTableTasks);

foreach(Task<DataTable> dataTableTask in dataTableTasks)
{
    table.Merge(await dataTableTask);
}

在Main（）中循环执行任务

1 个答案: