如何在一个过程中暂停然后在它之后返回值？

Question

我正在开发一个C#项目,希望在一个程序中做一个小的暂停约2秒.

其实我已经尝试过使用Invoke,但是如你所知,我们不能在类中使用它这种程序.

这是我的代码以获取更多详细信息:

public class GenerateFile
{

    public CSPFEnumration.ProcedureResult GenerateFaxFile(string Daftar_No, string Channelno, string NationalCode)
    {
        string script = string.Format(" DECLARE @RC INT " +
                                        " DECLARE @Daftar_No INT = '{0}' " +
                                        " DECLARE @hokm_type_code INT = 100 " +
                                        " DECLARE @Channelno INT = '{1}' " +
                                        " DECLARE @Id_No BIGINT = '{2}' " +
                                        " EXEC @rc = [dbo].[Hokm_with_type] @Daftar_No, @hokm_type_code, @Channelno, @Id_No ",
                                        Daftar_No,
                                        Channelno,
                                        NationalCode);
        try
        {
            IEnumerable<string> commandStrings = Regex.Split(script, @"^\s*GO\s*$",
                                                    RegexOptions.Multiline | RegexOptions.IgnoreCase);
            Connect();
            foreach (string commandString in commandStrings)
            {
                if (commandString.Trim() != "")
                {
                    using (var command = new SqlCommand(commandString, Connection))
                    {
                        command.ExecuteNonQuery();
                    }
                }
            }

            DisConnect();

            string FaxFilePath = InternalConstant.FaxFilePath + "\\" + string.Format("Lhokm{0}.tif", Channelno);


            // I want to make a pause in here without locking UI

            if (File.Exists(FaxFilePath))
                return CSPFEnumration.ProcedureResult.Success;
            else
                return CSPFEnumration.ProcedureResult.Error;

        }
        catch (Exception ex)
        {
            InternalDatabase.GetInstance.InsertToPensionOrganizationException(ex);
            return CSPFEnumration.ProcedureResult.Error;
        }
    }
}

我也试过等待,但我无法恢复正确的价值.因为在这个过程中如果我使用await,该值将在完成等待之前返回.

编辑:

而且我也不想使用,Thread.Sleep因为它会锁定UI.谢谢你的帮助.

Answer 1

使用async await功能:

将您的方法标记为异步.

添加Task.Delay(2000)作为等待任务.

 public async CSPFEnumration.ProcedureResult GenerateFaxFile(string Daftar_No, string Channelno, string NationalCode)
        {
                -----
                // I want to make a pause in here without locking UI
              await Task.Delay(2000);
                -----
        }

Answer 2

您可以环顾四周，Task.Delay()它不会阻塞当前线程并在几毫秒后继续执行。

msdn的用法示例：

Stopwatch sw = Stopwatch.StartNew();
var delay = Task.Delay(1000).ContinueWith(_ =>
                           { sw.Stop();
                             return sw.ElapsedMilliseconds; } );

Console.WriteLine("Elapsed milliseconds: {0}", delay.Result);
// The example displays output like the following:
//        Elapsed milliseconds: 1013

或者也许看看Timer类。