Question

我有一张表格，其中包含地区，地区，投诉和案件状态。我想做的是：

创建表格的3个实例
使用一个作为主要表格，其中每个区域用于比较其他2
一个表格将计算每个区域与主要实例匹配的所有投诉 - 第三个计算所有案例状态，然后将所有三个结果插入另一个表

这是到目前为止的代码。问题是计数总是返回0，这会引发错误。

foreach (DataRow mainrow in CaseTable.Rows)
{
    RegionName = mainrow.Field<string>("Region");
    DistrictName = mainrow.Field<string>("DistrictName");

    if (mainrow.Field<string>("CaseStatus") == "Resolved")
        DistrictcaseCount++;
    DistrictcaseCount++;
    PercentageResolved = (DistrictResolvedCount / DistrictResolvedCount) * 100;
    PercResolved = PercentageResolved.ToString() + "%";

    ReportTable.Rows.Add(RegionName, DistrictName, DistrictcaseCount, DistrictResolvedCount, PercResolved);
}

Answer 1

您的问题中的代码段似乎存在多个问题。

您正在递增DistrictcaseCount而不是DistrictResolvedCount
您正在通过将DistrictResolvedCount除以自身来计算百分比。
您正在进行分组，对于DistrictResolvedCount / DistrictcaseCount，它将始终为0，因为它们是整数。
您将在每个案例后添加一个新行。

我相信这会做你想要的：

// This will count cases and resolved cases, grouped by district.
var districtGroups = 
    from row in CaseTable.Rows
    group row by new { 
        Region = row.Field<string>("Region"), 
        District = row.Field<string>("DistrictName") 
    } into g
    select new {
        Region = g.Key.Region,
        District = g.Key.District,
        CaseCount = g.Count(),
        ResolvedCaseCount = g.Count(r => "Resolved".Equals(r.Field<string>("CaseStatus")))
    };

// this will calculate the percentage and add the rows.
foreach (var entry in districtGroups)
{
    // determine percentage.
    string percentageResolved;
    if (entry.CaseCount > 0)
    {
        var percent = (100.0 * entry.ResolvedCaseCount) / CaseCount;
        percentageResolved = percent.ToString() + "%";
    }
    else // What to do if there are no cases? 
    {
        percentageResolved = "N/A";
    }

    // add row for the district.
    ReportTable.Rows.Add(
        entry.Region, entry.District, 
        entry.CaseCount, entry.ResolvedCaseCount, 
        percentageResolved);
}

Answer 2

@Alex我修复了这些问题。非常感谢你的代码。我最终得到了这个：

var districtGroups =来自CaseTable.Rows.Cast（）中的行按行分组 { Region = row.Field（＆＃34; Region＆＃34;）， District = row.Field（＆＃34; DistrictName＆＃34;）进入g 选择新的 { Region = g.Key.Region，区= g.Key.District， CaseCount = g.Count（）， ResolvedCaseCount = g.Count（r =＆gt;＆＃34;已解决＆＃34; .Equals（r.Field（＆＃34; CaseStatus＆＃34;））） };

        // this will calculate the percentage and add the rows.
        foreach (var entry in districtGroups)
        {
            // determine percentage.
            string percentageResolved;
            if (entry.CaseCount > 0)
            {

                var percent = (100.0 * entry.ResolvedCaseCount) / entry.CaseCount;
                percentageResolved = percent.ToString() + "%";
            }
            else // What to do if there are no cases? 
            {
                percentageResolved = "N/A";
            }

            // add row for the district.
            ReportTable.Rows.Add(
                entry.Region, entry.District,
                entry.CaseCount, entry.ResolvedCaseCount,
                percentageResolved);
        }

Count返回Zero asp.net

2 个答案: