在 Visual Studio 中绘制图表时出现问题

Question

注意：我使用的是 .NET 6，它在 Windows 窗体中没有图表。我正在使用 winforms-datavisualization。

我有一个项目，可以分析文本文件中每个字母的频率并用它创建直方图。当我尝试使用排序字典绘制图表时出现问题。

使用

chart1.Series.Add(series);

var keys = sortedFrequencies.Keys.ToList();
var values = sortedFrequencies.Values.ToList();

for (int i = 0; i < keys.Count; i++) {
    int pointIndex = series.Points.AddXY(keys[i], values[i]);
    series.Points[pointIndex].AxisLabel = keys[i].ToString();
    textBox1.Text += keys[i].ToString();
    textBox2.Text += values[i].ToString();
}

chart1.ChartAreas[0].AxisX.Interval = 1;
chart1.ChartAreas[0].AxisX.LabelStyle.Angle = -45;
chart1.ChartAreas[0].AxisX.LabelStyle.IsStaggered = true;
chart1.Invalidate();

我得到了所有列，但由于某种原因它们没有排序：

当我将

var keys = sortedFrequencies.Keys.ToList();

更改为

var keys = sortedFrequencies.Keys.Select(k => k.ToString()).ToList();

我得到的看起来像是一个排序图，但所有列都重叠：

完整代码：

    private Dictionary<char, int> charFrequencies;

    public Form1() {
        InitializeComponent();
        charFrequencies = new Dictionary<char, int>();
    }

    private void chart1_Click(object sender, EventArgs e) { }

    private void buttonLoadFile_Click_1(object sender, EventArgs e) {
        OpenFileDialog fileDialog = new OpenFileDialog();
        if (fileDialog.ShowDialog() == DialogResult.OK) {
            textBoxFilePath.Text = fileDialog.FileName;
            AnalyzeFile(fileDialog.FileName);
            DrawHistogram(charFrequencies); // Показати початкові дані
        }
    }

    private void AnalyzeFile(string filePath) {
        charFrequencies.Clear();
        string text = File.ReadAllText(filePath).ToLower();
        foreach (char c in text) {
            if (char.IsLetter(c)) {
                if (charFrequencies.ContainsKey(c)) {
                    charFrequencies[c]++;
                } else {
                    charFrequencies[c] = 1;
                }
            }
        }
    }

    private void DrawHistogram(Dictionary<char, int> sortedFrequencies) {
        chart1.Series.Clear();
        Series series = new Series {
            Name = "Frequency",
            IsVisibleInLegend = false,
            ChartType = SeriesChartType.Column
        };

        textBox1.Clear();
        textBox2.Clear();

        chart1.Series.Add(series);

        var keys = sortedFrequencies.Keys.ToList();
        var values = sortedFrequencies.Values.ToList();

        for (int i = 0; i < keys.Count; i++) {
            int pointIndex = series.Points.AddXY(keys[i], values[i]);
            series.Points[pointIndex].AxisLabel = keys[i].ToString();
            textBox1.Text += keys[i].ToString();
            textBox2.Text += values[i].ToString();
        }

        chart1.ChartAreas[0].AxisX.Interval = 1;
        chart1.ChartAreas[0].AxisX.LabelStyle.Angle = -45;
        chart1.ChartAreas[0].AxisX.LabelStyle.IsStaggered = true;
        chart1.Invalidate();
    }

    private Dictionary<char, int> SortAlphabetically() {
        return charFrequencies.OrderBy(pair => pair.Key).ToDictionary(pair => pair.Key, pair => pair.Value);
    }

    private Dictionary<char, int> SortByFrequencyDesc() {
        return charFrequencies.OrderByDescending(pair => pair.Value).ToDictionary(pair => pair.Key, pair => pair.Value);
    }

    private Dictionary<char, int> SortByFrequencyAsc() {
        return charFrequencies.OrderBy(pair => pair.Value).ToDictionary(pair => pair.Key, pair => pair.Value);
    }

    private void Form1_Load(object sender, EventArgs e) { }

    private void button1_Click(object sender, EventArgs e) {
        DrawHistogram(SortAlphabetically());
    }

    private void button2_Click(object sender, EventArgs e) {
        DrawHistogram(SortByFrequencyDesc());
    }

    private void button3_Click(object sender, EventArgs e) {
        DrawHistogram(SortByFrequencyAsc());
    }

    private void textBoxFilePath_TextChanged(object sender, EventArgs e) { }
}

Answer 1

我在本地重现了您的问题并使用以下代码解决了它：

for (int i = 0; i < keys.Count; i++)
{
  int pointIndex = series.Points.AddXY(i, values[i]); //Note "AddXY(i, "
  series.Points[pointIndex].AxisLabel = keys[i].ToString();
}