Question

C＃的新手，并与EF挣扎并尝试在foreach循环中执行switch / case。我想将查询中的数据更改为字符串。

查询中的数据（密钥）是1 2 3.有没有办法做到这一点？

if (selectQuestion.SelectedValue == "1")
                {
                    var data = db.tbl_complaints_data
                        .Where(d => d.organisation_id == o.organisation_id
                        && d.Service == site
                        && d.Date.Month == month
                        && d.Q1 != null)
                        .GroupBy(d => d.Q1)
                        .Select(d => new { q1 = d.Key, total = d.Count() });

                    var segment = new List<object[]>();

                    foreach (var d in data)
                    {
                        segment.Add(new Object[] 
                        { 
                            switch (d.q1.ToString())
                            {
                                case "1":
                                    d.q1.ToString() = "Your care";
                                    break;
                                case "2":
                                    d.q1.ToString() = "Another's care [friend or relative]";
                                    break;
                                case "3":
                                    d.q1.ToString() = "Other type of complaint";
                                    break;
                            }, 
                            d.total
                        });
                    }

                    Render_PieChart(segment);

如果有任何兴趣，这是饼图。

protected void Render_PieChart(List<object[]> pData)
    {
        DotNet.Highcharts.Highcharts chart = new DotNet.Highcharts.Highcharts("chart")
            .InitChart(new Chart
            {
                DefaultSeriesType = ChartTypes.Pie
            })
            .SetTitle(new Title
            {
                Text = selectQuestion.SelectedItem.Text
            })
            .SetSubtitle(new Subtitle
            {
                Text = selectMonth.SelectedItem.Text
            })
            .SetSeries(new[]
                {
                    new Series 
                    {
                        Data = new DotNet.Highcharts.Helpers.Data(pData.ToArray())
                    }
                })
            .SetCredits(new Credits
            {
                Enabled = false
            });

        ltrChart.Text = chart.ToHtmlString();
    }`

非常感谢任何帮助或建议。

Answer 1

编译器告诉你代码错误：

您无法切换new Object[] init - ＆gt; Invalid expression term 'switch'
您无法将变量分配给ToString() - ＆gt; The left-hand side of an assignment must be a variable, property or indexer

将其重写为：

var segment = new List<object[]>();
foreach (var d in data)
{
    string q1String = "Unknown";
    switch (d.q1)
    {
        case 1:
            q1String = "Your care";
            break;
        case 2:
            q1String = "Another's care [friend or relative]";
            break;
        case 3:
            q1String = "Other type of complaint";
            break;
        default:
            break;
    }

    segment.Add(new Object[] 
    { 
        q1String, 
        d.total
    });
}

c＃DotNet.Highcharts切换语句

1 个答案: