Question

我的函数应该用＆＃34;＆amp;＆＃34;分割字符串。＆＃34 ;;＆＃34;和＆＃34;，＆＃34;并返回三个锯齿状阵列，反之亦然。（来自如下数据：1,2,3; 4,5,6和1,2,3; 4,5,6）

我一直在努力使其发挥作用，现在出于某种原因我在

上获得了system.argumentnullexception

Array.Copy(playerOneEnts, allEnts[0], playerOneEnts.Length);
Array.Copy(playerTwoEnts, allEnts[1], playerTwoEnts.Length);

完整代码：

public string convertToString(string[][][] allEnts)
{
    string Player = string.Empty;
    string[][] playerOneEnts = new string[maxEnts][];
    string[][] playerTwoEnts = new string[maxEnts][];

    Array.Copy(allEnts[0], playerOneEnts, allEnts[0].Length);
    Array.Copy(allEnts[1], playerTwoEnts, allEnts[1].Length);

    for (int j = 0; j < playerOneEnts.Length; j++)
    {
        for (int i = 0; i < playerOneEnts[j].Length; i++)
        {
            Player += playerOneEnts[j][i] + ",";
        }

        Player = Player.TrimEnd(',');
        Player += ";";
    }

    Player = Player.TrimEnd(';');
    Player += "&";

    for (int j = 0; j < playerTwoEnts.Length; j++)
    {
        for (int i = 0; i < playerTwoEnts[j].Length; i++)
        {
            Player += playerTwoEnts[j][i] + ",";
        }

        Player = Player.TrimEnd(',');
        Player += ";";
    }

    Player = Player.TrimEnd(';');
    return Player;
}

public string[][][] convertToArray(string ents)
{
    string[] p = new string[2];
    string[][] playerOneEnts = new string[maxEnts][];
    string[][] playerTwoEnts = new string[maxEnts][];
    string[][][] allEnts = new string[2][][];

    p = ents.Split('&');

    try
    {
        playerOneEnts = p[0].Split(new[] { ";" }, StringSplitOptions.RemoveEmptyEntries).Select(chunk => chunk.Split(',')).ToArray();
        playerTwoEnts = p[1].Split(new[] { ";" }, StringSplitOptions.RemoveEmptyEntries).Select(chunk => chunk.Split(',')).ToArray();

        MessageBox.Show(playerOneEnts.Length.ToString());

        Array.Copy(playerOneEnts, allEnts[0], playerOneEnts.Length);
        Array.Copy(playerTwoEnts, allEnts[1], playerTwoEnts.Length);
    }
    catch
    {
        MessageBox.Show("unable to convert string", "Fatal Error");
    }

    return allEnts;
}

对我来说，代码看起来像是一场灾难，如果有人知道将它转换为字符串的更好方法，我会为任何想法感到高兴。摆脱我的错误已经足够帮助我了。

谢谢！

Answer 1

以下是使用Linq的示例（需要.Net 4.0）：

var source = "1,2,3;4,5,6&1,2,3;4,5,6";

string[][][] decoded = source.Split('&').Select(x => x.Split(';').Select(y => y.Split(',').ToArray()).ToArray()).ToArray();

string reencoded = String.Join("&", decoded.Select(x => String.Join(";", x.Select(y => String.Join(",", y)))));

或者，IEnumarable泛型可用于避免转换为数组。

警告：此代码不会验证输入，例如数组长度。

编辑：.NET 3.5的重编码器：

var reencoded = String.Join("&", decoded.Select(x => String.Join(";", x.Select(y => String.Join(",", y)).ToArray())).ToArray());

Answer 2

您可以使用嵌套的for循环来执行此操作：

public synchronized void start(int max) {
    try {

        // max = total number of questions
        for (int i = 1; i < max; i++) {

            //new cmd command
            Process p = Runtime.getRuntime().exec("cmd");

            // new thread
            new Thread(() -> {
                try (BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream()))) {
                    String line;
                    while ((line = reader.readLine()) != null)
                        System.out.println(line);
                } 
                catch (Exception e) {
                    e.printStackTrace();
                }

            }).start();

            //used to change text in files and the remaining cmd commands and move the result
            try (PrintStream out = new PrintStream(p.getOutputStream())) {

                //to clear previous index folder and delete results folder
                deleteFile();

                //to rewrite the "collection.spec" folder with the address of the Answers file
                answerFile(i);

                //to rewrite the "trec.topics.list"" folder with the address of the Questions file
                questionFile(i);


                /* PROBLEM STARTS HERE! */
                for(int c = 1; c <= 17; c++) {

                    // after rename do the remaining cmd commands
                    out.println("C:/TERRIERS/terrier/bin/trec_terrier.bat -i");
                    out.println("C:/TERRIERS/terrier/bin/trec_terrier.bat -r");

                    //change model
                    modelSelect();
                }

                /* PROBLEM ENDS HERE!*/
                // .....
            }

            p.waitFor();

            //move the ".res" folder to the Results folder in projects directory 
            takeFile(i);
        }
    }
    catch(IOException ex) {
    }

    catch(InterruptedException ex) {
    }
}

编码类似：

    int counter = 1;
    public void modelSelect() {

    //location of file
    String s = "C:\\TERRIERS\\terrier\\etc\\trec.models";

    try {

        FileOutputStream is = new FileOutputStream(s);
        OutputStreamWriter osw = new OutputStreamWriter(is);    
        Writer w = new BufferedWriter(osw);
        //depends on count value change the model inside "trec.models" and increase counter by 1

        switch (counter) {

        case 1 : w.write("uk.ac.gla.terrier.matching.models.BM25"); counter++; break;
        case 2 : w.write("uk.ac.gla.terrier.matching.models.DFR_BM25"); counter++; break;
        case 3 : w.write("uk.ac.gla.terrier.matching.models.TF_IDF"); counter++; break;
        case 4 : w.write("uk.ac.gla.terrier.matching.models.BB2"); counter++; break;
        case 5 : w.write("uk.ac.gla.terrier.matching.models.IFB2"); counter++; break;
        case 6 : w.write("uk.ac.gla.terrier.matching.models.In_expB2"); counter++; break;
        case 7 : w.write("uk.ac.gla.terrier.matching.models.In_expC2"); counter++; break;
        case 8 : w.write("uk.ac.gla.terrier.matching.models.InL2"); counter++; break;
        case 9 : w.write("uk.ac.gla.terrier.matching.models.PL2"); counter++; break;
        case 10 : w.write("uk.ac.gla.terrier.matching.models.DFR"); counter++; break;
        case 11 : w.write("uk.ac.gla.terrier.matching.models.DFRWeightingModel"); counter++; break;
        case 12 : w.write("uk.ac.gla.terrier.matching.models.DLH"); counter++; break;
        case 13 : w.write("uk.ac.gla.terrier.matching.models.DLH13"); counter++; break;
        case 14 : w.write("uk.ac.gla.terrier.matching.models.Hiemstra_LM"); counter++; break;
        case 15 : w.write("uk.ac.gla.terrier.matching.models.Idf"); counter++; break;
        case 16 : w.write("uk.ac.gla.terrier.matching.models.LemurTF_IDF"); counter++; break;
        case 17 : w.write("uk.ac.gla.terrier.matching.models.WeightingModel"); counter=1; break;//reset counter to 1
        }

        w.close(); 
    }
    catch (IOException e) { 
    }
}

c＃将锯齿状数组复制到字符串

2 个答案: