对多个任务使用Task.WhenAll时，在foo.Start()上获取错误 [英] Getting error on foo.Start() when using Task.WhenAll for multiple tasks

问题描述

我收到此错误在约定样式的任务上可能无法调用开始".所以我注释掉了 .Start().我再试一次收到此错误可能无法在已完成的任务上调用启动".那么我应该怎么做才能使其正常工作?

I'm getting this error "Start may not be called on a promise-style task." so I commented out the .Start(). I tried again & got this error "Start may not be called on a task that has completed." So what am I suppose to do to make this work properly?

                var dashboardDailyAgeAnalysis = DailyAgeAnalysesTotalRowsCountAsync(v.BookItOutAccountId, v.ClientMgntAccountNumber, yesterdayDate);
                var dashboardDailyBalance = DailyBalanceTotalRowsCountAsync(v.BookItOutAccountId, v.ClientMgntAccountNumber, yesterdayDate);
                var dashboardDailyInventory = DailyInventoryTotalRowsCountAsync(v.BookItOutAccountId, v.ClientMgntAccountNumber, yesterdayDate);

               // dashboardDailyAgeAnalysis.Start();
               // dashboardDailyBalance.Start();
               // dashboardDailyInventory.Start();

                await Task.WhenAll(
                    dashboardDailyAgeAnalysis, dashboardDailyBalance, dashboardDailyInventory
                );

                // Do something with these results.
                var result1 = dashboardDailyAgeAnalysis.Result;
                var result2 = dashboardDailyBalance.Result;
                var result3 = dashboardDailyInventory.Result;

推荐答案

        await Task.WhenAll(
            dashboardDailyAgeAnalysis, dashboardDailyBalance, dashboardDailyInventory
        );

        // Do something with these results.
        var result1 = await dashboardDailyAgeAnalysis;
        var result2 = await dashboardDailyBalance;
        var result3 = await dashboardDailyInventory;

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