Question

正常运行解决方案时，我只会收到System.IndexOutOfRangeException错误，但进入整个循环时一切正常。

a busy cat

我已经尝试了捕获异常，但是没有喜悦。

An error has occurred
The application failed to start (exited with code 1).


Attaching package: ‘DT’

The following objects are masked from ‘package:shiny’:

    dataTableOutput, renderDataTable

Adding cronjob:
---------------

# cronR job
# id:   temp_data_fetch
# tags: lab, xyz
# desc: temp Data Loading
0-59 * * * * /opt/R/3.5.3/lib/R/bin/Rscript '/srv/connect/apps/Temp/ETL.R'  >> '/srv/connect/apps/Temp/ETL.log' 2>&1
Error in value[[3L]](cond) : error in running command
Calls: local ... tryCatch -> tryCatchList -> tryCatchOne -> <Anonymous>
Execution halted

        #Cron Script
        if(!(file.exists("/srv/connect/apps/Temp/scripts_scheduled.rds"))){
            cmd <- cronR::cron_rscript(rscript = '/srv/connect/apps/Temp/ETL.R')
            cronR::cron_add(cmd, frequency = 'minutely', id = 'temp_data_fetch',description = 'temp Data Loading',tags = c('lab', 'xyz'))
            TEXT<-"temp_data_fetch"
            saveRDS(TEXT,"/srv/connect/apps/Temp/scripts_scheduled.rds")
        }

        #ETL.R 

        trigger_time <- readRDS(file = "/srv/connect/apps/Temp/trigger_time.rds")
        trigger_time <- c(trigger_time,paste(Sys.time()))
        saveRDS(trigger_time,file = "/srv/connect/apps/Temp/trigger_time.rds")

如果Jobs []。JobID为false，我希望初始化thread []数组中的所有线程。

下面是CountUp（）方法：

private void button1_Click(object sender, EventArgs e)
        {
            for (int j = 0; j < jobs.Length; j++)
            {
                if (jobs[j].JobID == false)
                {
                    for (int k = 0; k < threads.Length; k++)
                    {
                        if (threads[k] != null)
                        {
                            if (!(threads[k].ThreadState == ThreadState.Stopped) | !(threads[k].ThreadState == ThreadState.Unstarted))
                            {
                                continue;
                            }
                        }

                        try
                        {
                            threads[k] = new Thread(() => CountUp("ftp://ftp.net" + jobs[j].FTPFolder, HomePath + jobs[j].localFolder, j));
                            threads[k].Name = "Thread " + j + "¦ ID: " + threads[k].ManagedThreadId.ToString();
                            jobs[j].JobID = true;
                            //threads[k].Start();
                            break;
                        }
                        catch (Exception exception)
                        {
                            Console.WriteLine(exception);
                            throw;
                        }

                    }
                }
            }
            StartThreads();
        }

以下初始化线程[]和作业[]：

        private void CountUp(string ftppath,string localFile, int jobsID)
        {
            //string conf="";
            NumberThreads++;
            //string ftpPath = "ftp://ftp.Rxsystems.net" + conf.Split('¦')[1];
            //string downloadPath = HomePath + conf.Split('¦')[0] + "\\";

            string ftpPath = ftppath;
            string downloadPath = localFile;

            List<string> MSI = new List<string>(KD.FTP.Class.ListFiles(ftpPath,
                FTPuser, FTPpass));

            if (MSI.Count > 0)
            {
                KD.File.Class.Logger(Thread.CurrentThread.Name + ", " + MSI.Count + " Files in " + ftpPath, CurDir + "\\log.txt");

                this.textBox1.AppendText(Thread.CurrentThread.Name + ", " + MSI.Count + " Files in " + ftpPath);
                //this.textBox1.AppendText("\n\r");
                int count = 0;
                foreach (string ftpFile in MSI)
                {
                    KD.FTP.Class.Download(ftpPath + ftpFile,downloadPath + "\\" + ftpFile, FTPuser,FTPpass);
                    count++;
                    KD.File.Class.Logger(Thread.CurrentThread.Name + ", " + "Downloaded " + count + "/" + MSI.Count + " Files - " + ftpFile, CurDir + "\\log.txt");
                    this.textBox1.AppendText(Thread.CurrentThread.Name + ", " + "Downloaded " + count + "/" + MSI.Count + " Files - " + ftpFile);
                    //this.textBox1.AppendText("\n\r");
                }
            }


            NumberThreads--;
            jobs[jobsID].JobID = false;
        }

Answer 1

从我可以看到的问题是j变量，该变量从闭包捕获到传递给new Thread的委托中。众所周知的问题是，实际的委托执行在循环执行后引用状态变量，因此应该有效地包含超出范围的jobs.Length值。要解决此问题，您需要在循环内引入一个局部变量以复制j的值，然后使用此变量代替j作为传递给{{ 1}}构造函数：

jobs

如何解决'名称'k'在当前上下文中不存在'的错误？

1 个答案: