Question

我有一个asp:Chart控件，效果很好。我只是传递它的时间（以毫欧格式），然后是请求的平均时间长度值。以下代码可以满足我的需求 - 几乎（如果我为了图书馆控件的新手，我可以自由地标记它。）

我的数据如下表所示：

Date by Hours 9:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 
12/03/2010     8    43    53    55    33    46    51    60    50     9 
Friday       1.773 1.337 1.242 1.239 1.340 1.191 1.479 1.223 1.178 1.516

给我一张漂亮的图表。我的问题在于以下代码：

List<double> yValues = new List<double>();
List<string> xValues = new List<string>();

// First and Last columns do not contain chartable data
for (int i = 1; i < dtResults.Columns.Count - 1; i++) {
    double d;
    if (double.TryParse(dtResults.Rows[1][i].ToString(), out d))
        yValues.Add(d == 0 ? double.NaN : d);
    else
        yValues.Add(double.NaN);
} // foreach of the Average Time Values the chart

// foreach of the column names
for (int i = 1; i < dtResults.Columns.Count - 1; i++)
    xValues.Add(dtResults.Columns[i].ColumnName);

this.Chart.Titles["Title1"].Text = string.Format(
    "Average Request Time In Seconds On {0:MM/dd/yyyy} Between {1:HH} and {2:HH} In {3}",
    this.DateRange.BeginDate.Value,
    this.ucsTimePicker.BeginTime,
    this.ucsTimePicker.EndTime,
    this.SelectedSourceEnvironmentName
);
this.Chart.Series["Series1"].Points.DataBindXY(xValues, yValues);
this.Chart.Series["Series1"].ChartType = SeriesChartType.Line;
this.Chart.Series["Series1"].IsValueShownAsLabel = true;
this.Chart.Series["Series1"]["ShowMarkerLines"] = "true";
this.Chart.Series["Series1"].Label = "#VALY{0.000}"; // Make sure they have only 3 decimal places

this.Chart.ChartAreas["ChartArea1"].AxisX.IsMarginVisible = true;
this.Chart.ChartAreas["ChartArea1"].AxisX.Title = "Hours of the Day";
this.Chart.ChartAreas["ChartArea1"].AxisY.Title = "Time in Seconds";

// Handle styling when there is a Zero or missing value
this.Chart.Series["Series1"].EmptyPointStyle.Color = Color.Red;
this.Chart.Series["Series1"].EmptyPointStyle.BorderWidth = 3;
this.Chart.Series["Series1"].EmptyPointStyle.BorderDashStyle = ChartDashStyle.Dash;
this.Chart.Series["Series1"].EmptyPointStyle.MarkerStyle = MarkerStyle.Diamond;
this.Chart.Series["Series1"].EmptyPointStyle.MarkerColor = Color.Red;
this.Chart.Series["Series1"].EmptyPointStyle.MarkerSize = 8;
this.Chart.Series["Series1"].EmptyPointStyle.MarkerBorderColor = Color.Black;
this.Chart.Series["Series1"]["EmptyPointValue"] = "Zero";

有标签显示（上表中的十进制数字），但我想要做的是标签同时显示表格中第二行数据的请求总数以上。我能够使用以下代码将值添加到图表中：

for (int i = 1; i < dtResults.Columns.Count - 1; i++) {
  int n;
  if (int.TryParse(dtResults.Rows[0][i].ToString(), out n))
    this.Chart.Series["Series1"].Points.AddY(n);
  else
    this.Chart.Series["Series1"].Points.AddY(0);
} // foreach of the Count of Request within the Hour values

这似乎没有任何问题，但我无法通过以下调整访问这些值：

this.Chart.Series["Series1"].Label = "#VALY{0.000}\n#VALY2{0}";

我得到的只是原始值（1.773）出现两次。

那么有没有办法将数据添加到图表中，仅用于标记目的，然后访问它？

Answer 1

好的，在这里没有任何帮助（实际上让我感到震惊）之后，我能够在本网站之外的一些帮助下找到答案。基本上，我不必添加“额外”数据，但我必须修改每个Label，而不是像下面那样使用通用标签：

this.Chart.Series["Series1"].Label = "#VALY{0.000}"; // Make sure they have only 3 decimal places

我还必须拿出以下一行：

this.Chart.Series["Series1"].IsValueShownAsLabel = true;

所以为了简洁起见，这里是整个代码给出了两行标签，其中第一行显示平均值（即实际图表数据），第二行是根本不在数据中的计数。

List<double> yValues = new List<double>();
List<string> xValues = new List<string>();
List<int> zValues = new List<int>();

// First and Last columns do not contain chartable data
for (int i = 1; i < dtResults.Columns.Count - 1; i++) {
    double d;
    if (double.TryParse(dtResults.Rows[1][i].ToString(), out d))
        yValues.Add(d == 0 ? double.NaN : d);
    else
        yValues.Add(double.NaN);
} // foreach of the Average Time Values the chart

// foreach of the column names
for (int i = 1; i < dtResults.Columns.Count - 1; i++)
    xValues.Add(dtResults.Columns[i].ColumnName);

this.Chart.Titles["Title1"].Text = string.Format(
    "Average Request Time In Seconds On {0:MM/dd/yyyy} Between {1:HH} and {2:HH} In {3}",
    this.DateRange.BeginDate.Value,
    this.ucsTimePicker.BeginTime,
    this.ucsTimePicker.EndTime,
    this.SelectedSourceEnvironmentName
);
this.Chart.Series["Series1"].Points.DataBindXY(xValues, yValues);

/// This loop will setup the point labels in a two line format where the first line displays
/// the Average that the point is actually showing.  The second line is data taken from the
/// results table and is not a part of the chart at all but is useful information and is the
/// Count of records in that time frame.
/// In order for this to work, the Series property IsValueShownAsLabel needs to be NOT True.
for (int i = 0; i < this.Chart.Series["Series1"].Points.Count; i++) {
    int n = 0;
    int.TryParse(dtResults.Rows[0][i + 1].ToString(), out n);

    this.Chart.Series["Series1"].Points[i].Label = string.Format("Avg: #VALY{{0.000}}\nCount: {0}", n);
} // foreach of the Count of Request within the Hour values

this.Chart.Series["Series1"].ChartType = SeriesChartType.Line;
this.Chart.Series["Series1"]["ShowMarkerLines"] = "true";
this.Chart.ChartAreas["ChartArea1"].AxisX.IsMarginVisible = true;
this.Chart.ChartAreas["ChartArea1"].AxisX.Title = "Hours of the Day";
this.Chart.ChartAreas["ChartArea1"].AxisY.Title = "Time in Seconds";

// Handle styling when there is a Zero or missing value
this.Chart.Series["Series1"].EmptyPointStyle.Color = Color.Red;
this.Chart.Series["Series1"].EmptyPointStyle.BorderWidth = 3;
this.Chart.Series["Series1"].EmptyPointStyle.BorderDashStyle = ChartDashStyle.Dash;
this.Chart.Series["Series1"].EmptyPointStyle.MarkerStyle = MarkerStyle.Diamond;
this.Chart.Series["Series1"].EmptyPointStyle.MarkerColor = Color.Red;
this.Chart.Series["Series1"].EmptyPointStyle.MarkerSize = 8;
this.Chart.Series["Series1"].EmptyPointStyle.MarkerBorderColor = Color.Black;
this.Chart.Series["Series1"]["EmptyPointValue"] = "Zero";

ASP.Net图表 - 图表中没有使用额外数据的标签？

1 个答案: