Question

我正在使用C＃我有一个功能：

#include "notepadwindow.h"
#include "ui_notepadwindow.h"
#include <QFileDialog>
#include <QComboBox>

NotepadWindow::NotepadWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::NotepadWindow)

{
    ui->setupUi(this);
    ui->actionBold->setCheckable(true);
    ui->actionItalics->setCheckable(true);
    ui->actionUnderline->setCheckable(true);
    ui->actionLeft->setCheckable(true);
    ui->actionRight->setCheckable(true);
    ui->actionCenter->setCheckable(true);
    ui->actionJustify->setCheckable(true);
    this->setCentralWidget(ui->textEdit); // Wyśrodkuj Pole tekstowe
    QComboBox* myComboBox = new QComboBox;
    ui->mainToolBar->addWidget(myComboBox);
    for (int i = 1; i < 102; i += 2) {
      myComboBox->addItem(QString::number(i));
    }
    myComboBox->setCurrentText("11");
    ui->textEdit->setFontPointSize(11);
    ui->actionLeft->setChecked(true);
    ui->actionRight->setChecked(false);
    ui->actionCenter->setChecked(false);
    ui->actionJustify->setChecked(false);
    QObject::connect(myComboBox, SIGNAL(currentTextChanged(QString)), this, SLOT(onFontSizeChanged(QString)));
    connect(ui->textEdit, SIGNAL(QTextEdit::cursorPositionChanged()), this, SLOT());


}


NotepadWindow::~NotepadWindow()
{
    delete ui;
}



void NotepadWindow::openfile(QString textfile)
{
        QFile sFile(textfile);
        if(sFile.open(QFile::ReadOnly | QFile::Text)) // Jeśli plik jest otwarty
        {
            mFilename = textfile;
            QTextStream in(&sFile);
            in.setCodec("UTF-8"); // Ustaw kodowania znaków na UTF-8
            QString text = in.readAll();
            sFile.close();
            ui->textEdit->setHtml(text);
        }
}

void NotepadWindow::onFontSizeChanged(QString selected)
{
    ui->textEdit->setFontPointSize(selected.toInt());
}

void NotepadWindow::on_actionUndo_triggered()
{
    ui->textEdit->undo();
}

void NotepadWindow::on_actionRedo_triggered()
{
    ui->textEdit->redo();
}

void NotepadWindow::on_actionCut_triggered()
{
    ui->textEdit->cut();
}

void NotepadWindow::on_actionCopy_triggered()
{
    ui->textEdit->copy();
}

void NotepadWindow::on_actionPaste_triggered()
{
    ui->textEdit->paste();
}

void NotepadWindow::on_actionNew_triggered()
{
    mFilename = "";
    ui->textEdit->setPlainText("");
}

void NotepadWindow::on_actionOpen_triggered()
{
    QString file = QFileDialog::getOpenFileName(this, "open"); // Otwórz okienko wyboru plików
    if(!file.isEmpty())        // Jeśli plik nie jest pusty
    {
        QFile sFile(file);
        if(sFile.open(QFile::ReadOnly | QFile::Text)) // Jeśli plik jest otwarty
        {
            mFilename = file;
            QTextStream in(&sFile);
            in.setCodec("UTF-8"); // Ustaw kodowania znaków na UTF-8
            QString text = in.readAll();
            sFile.close();
            ui->textEdit->setHtml(text);
        }
    }
}

void NotepadWindow::on_actionSave_triggered()
{
    QFile sFile(mFilename);
    if(sFile.open(QFile::WriteOnly | QFile::Text)) // Jeśli plik jest otwarty
    {
        QTextStream out(&sFile);
        out << ui->textEdit->toHtml();
        out.setCodec("UTF-8"); // Ustaw kodowania znaków na UTF-8
        sFile.flush();
        sFile.close();

    }
    else if(!sFile.open(QFile::WriteOnly | QFile::Text)) on_actionSave_as_triggered();
}

void NotepadWindow::on_actionSave_as_triggered()
{
    QString file = QFileDialog::getSaveFileName(this,  tr("Text File"), "", tr("Text files (*.txt)"));
    if(!file.isEmpty())
    {
        mFilename = file;
        on_actionSave_triggered();
    }
}




void NotepadWindow::on_actionBold_triggered(bool checked)
{
    if(checked)
    {
        ui->textEdit->setFontWeight(QFont::Bold);
    }
    if(!checked)
    {
        ui->textEdit->setFontWeight(QFont::Normal);
    }

}

void NotepadWindow::on_actionItalics_triggered(bool checked)
{
    if(checked)
    {
        ui->textEdit->setFontItalic(1);
    }
    if(!checked)
    {
        ui->textEdit->setFontItalic(0);
    }

}

void NotepadWindow::on_actionUnderline_triggered(bool checked)
{
    if(checked)
    {
        ui->textEdit->setFontUnderline(1);
    }
    if(!checked)
    {
        ui->textEdit->setFontUnderline(0);
    }

}

void NotepadWindow::on_actionLeft_triggered()
{
    ui->textEdit->setAlignment(Qt::AlignLeft);
    ui->actionLeft->setChecked(true);
    ui->actionRight->setChecked(false);
    ui->actionCenter->setChecked(false);
    ui->actionJustify->setChecked(false);
}

void NotepadWindow::on_actionCenter_triggered()
{
    ui->textEdit->setAlignment(Qt::AlignCenter);
    ui->actionLeft->setChecked(false);
    ui->actionRight->setChecked(false);
    ui->actionCenter->setChecked(true);
    ui->actionJustify->setChecked(false);
}

void NotepadWindow::on_actionRight_triggered()
{
    ui->textEdit->setAlignment(Qt::AlignRight);
    ui->actionLeft->setChecked(false);
    ui->actionRight->setChecked(true);
    ui->actionCenter->setChecked(false);
    ui->actionJustify->setChecked(false);
}

void NotepadWindow::on_actionJustify_triggered()
{
    ui->textEdit->setAlignment(Qt::AlignJustify);
    ui->actionLeft->setChecked(false);
    ui->actionRight->setChecked(false);
    ui->actionCenter->setChecked(false);
    ui->actionJustify->setChecked(true);
}

我把public double[] PerformBeeDance(double[] vector, double r) { int index = rand.Next(0, vector.Length); double[] result = vector; result[index] = vector[index] + rand.NextDouble() * r; return result; }放到这个函数中并在调用之后：

bees[i].Position

newbee.Position = PerformBeeDance(bees[i].Position, r);正在改变bees[i].Position但它应该保持不变。

此代码有什么问题？

Answer 1

double[]是一个ReferenceType，所以虽然它是作为副本传递的，但副本只是引用，它们都引用同一个实例。

修改

可能的解决方案正如@RaymondChen在评论中指出的那样，是Array.Clone：

public double[] PerformBeeDance(double[] vector, double r) { int index = rand.Next(0, vector.Length); double[] result = vector.Clone(); result[index] = vector[index] + rand.NextDouble() * r; return result; }

或使用来电代码制作副本：

newbee.Position = PerformBeeDance(bees[i].Position.Clone(), r);

调用此函数后输入函数参数更改

1 个答案: