[英]LINQ query on an object list to get distribution based on multiple fields
I have a list of bugs MyBugList
created using the following class 我有一个使用以下类创建的错误
MyBugList
列表
internal class BugDetails
{
public int Id { get; set; }
public string State { get; set; }
public string Severity { get; set; }
}
I wanted to group these bugs based on State
and Severity
. 我想根据
State
和Severity
对这些错误进行分组。 I used the following code to achieve it. 我使用以下代码来实现它。
var BugListGroup = (from bug in MyBugList
group bug by new
{
bug.State,
bug.Severity
} into grp
select new
{
BugState = grp.Key.State,
BugSeverity = grp.Key.Severity,
BugCount = grp.Count()
}).OrderBy(x=> x.BugState).ToList();
This linq query gives me output like the following 这个linq查询给出了如下输出
Closed Critical 40
Active Critical 167
Closed Medium 819
Closed Low 323
Resolved Medium 61
Resolved Low 11
Closed High 132
Active Low 17
Active Medium 88
Active High 38
Resolved High 4
Resolved Critical 22
Deferred High 11
However I would like to get an output like below 但是我想得到如下的输出
Critical High Medium Total
Closed 3 4 5 12
Active 5 4 5 14
Resolved 6 4 5 15
Deferred 1 4 5 10
Total 15 16 20 51
Is it possible to get this via a LINQ query on MyBugList
or on BugListGroup
是否可以通过
MyBugList
或BugListGroup
上的LINQ查询获取此BugListGroup
I would like to get the output as a list so that I can be make it source a data grid.
我想将输出作为一个列表,以便我可以使它成为一个数据网格源。
Note: State and Severity values are dynamic and cannot be hard coded
注意:State和Severity值是动态的,不能进行硬编码
Below is my implementation with the help of answer provided by Dmitriy Zapevalov 以下是我在Dmitriy Zapevalov提供的答案的帮助下实施的
private void button1_Click(object sender, EventArgs e)
{
var grouped = MyBugList.GroupBy(b => b.State).Select(stateGrp => stateGrp.GroupBy(b => b.Severity));
//Setting DataGrid properties
dataGridBug.Rows.Clear();
dataGridBug.Columns.Clear();
dataGridBug.DefaultCellStyle.NullValue = "0";
dataGridBug.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter;
//Declaring DataGrid Styles
var gridBackColor = Color.AliceBlue;
var gridFontStyle = new Font(Font, FontStyle.Bold | FontStyle.Italic);
//Declaring column and row Ids
const string stateColumnId = "State";
const string totalColumnId = "Total";
const string totalRowId = "Total";
//Adding first column
dataGridBug.Columns.Add(stateColumnId, stateColumnId);
dataGridBug.Columns[0].DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleLeft;
//Adding other columns
foreach (var strSeverity in MyBugList.Select(b => b.Severity).Distinct())
{
dataGridBug.Columns.Add(strSeverity, strSeverity);
}
//Adding Total Column
var totColPos = dataGridBug.Columns.Add(totalColumnId, totalColumnId);
var totCol = dataGridBug.Columns[totColPos];
//Adding data to grid
foreach (var state in grouped)
{
var nRow = dataGridBug.Rows.Add();
var severities = state as IList<IGrouping<string, BugDetails>> ?? state.ToList();
dataGridBug.Rows[nRow].Cells[0].Value = severities.First().First().State;
var sevCount = 0;
foreach (var severity in severities)
{
dataGridBug.Rows[nRow].Cells[severity.Key].Value = severity.Count();
sevCount += severity.Count();
}
dataGridBug.Rows[nRow].Cells[totalColumnId].Value = sevCount;
}
//Adding total row
var totRowPos = dataGridBug.Rows.Add(totalRowId);
var totRow = dataGridBug.Rows[totRowPos];
//Adding data to total row
for (var c = 1; c < dataGridBug.ColumnCount; c++)
{
var sum = 0;
for (var i = 0; i < dataGridBug.Rows.Count; ++i)
{
sum += Convert.ToInt32(dataGridBug.Rows[i].Cells[c].Value);
}
dataGridBug.Rows[totRowPos].Cells[c].Value = sum;
}
//Styling total column
totCol.DefaultCellStyle.BackColor = gridBackColor;
totCol.DefaultCellStyle.Font = gridFontStyle;
//Styling total row
totRow.DefaultCellStyle.BackColor = gridBackColor;
totRow.DefaultCellStyle.Font = gridFontStyle;
}
You can do this (it is dynamic solution, where you not need to hardcode anything). 你可以这样做(它是动态解决方案,你不需要硬编码任何东西)。
Details
property of BugModel
class contains all columns as Critical , High and so on: BugModel
类的Details
属性包含Critical , High等所有列:
public class BugModel
{
public string BugState { get; set; }
public Dictionary<string, int> Details { get; set; }
public int Total { get { return Details.Sum(x => x.Value); } }
}
Solution: 解:
var result = (from bug in BugListGroup
group bug by bug.BugState into sub
select new BugModel
{
BugState = sub.Key,
Details = sub.GroupBy(x => x.BugSeverity)
.ToDictionary(x => x.Key, x => x.Sum(y => y.BugCount))
}).ToList();
I've done double grouping: 我做过双重分组:
class Program
{
internal class BugDetails
{
public int Id { get; set; }
public string State { get; set; }
public string Severity { get; set; }
}
static void Main(string[] args)
{
var MyBugList = new BugDetails[]
{
new BugDetails() { Id = 1, State = "Active", Severity = "Critical" },
new BugDetails() { Id = 1, State = "Closed", Severity = "Critical" },
new BugDetails() { Id = 1, State = "Closed", Severity = "Critical" },
new BugDetails() { Id = 1, State = "Closed", Severity = "Critical" },
new BugDetails() { Id = 1, State = "Resolved", Severity = "Critical" },
new BugDetails() { Id = 1, State = "Resolved", Severity = "Critical" },
new BugDetails() { Id = 1, State = "Resolved", Severity = "Critical" },
new BugDetails() { Id = 1, State = "Active", Severity = "Medium" },
new BugDetails() { Id = 1, State = "Active", Severity = "Medium" },
new BugDetails() { Id = 1, State = "Closed", Severity = "Medium" },
new BugDetails() { Id = 1, State = "Closed", Severity = "Medium" },
new BugDetails() { Id = 1, State = "Resolved", Severity = "Medium" },
new BugDetails() { Id = 1, State = "Resolved", Severity = "Medium" },
new BugDetails() { Id = 1, State = "Resolved", Severity = "Medium" },
new BugDetails() { Id = 1, State = "Active", Severity = "High" },
new BugDetails() { Id = 1, State = "Active", Severity = "High" },
new BugDetails() { Id = 1, State = "Closed", Severity = "High" },
new BugDetails() { Id = 1, State = "Closed", Severity = "High" },
new BugDetails() { Id = 1, State = "Closed", Severity = "High" },
new BugDetails() { Id = 1, State = "Closed", Severity = "High" },
new BugDetails() { Id = 1, State = "Closed", Severity = "High" },
};
var grouped = MyBugList.GroupBy(b => b.State).
Select(stateGrp => stateGrp.GroupBy(b => b.Severity));
foreach (var state in grouped)
{
Console.Write("{0}: ", state.First().First().State);
foreach (var severity in state)
{
Console.Write("{0}={1} ", severity.Key, severity.Count());
}
Console.WriteLine();
}
}
}
Output: 输出:
Active: Critical=1 Medium=2 High=2
Closed: Critical=3 Medium=2 High=5
Resolved: Critical=3 Medium=3
If you want to display data with DataGridView In that case you can create type dynamically with your own Properties set. 如果要使用DataGridView显示数据在这种情况下,您可以使用自己的属性集动态创建类型。 But this way is to complicated.
但这种方式很复杂。 The most simple (and more performance) way is to fill DataGridView manually:
最简单(也是更多性能)的方法是手动填充DataGridView:
private void button1_Click(object sender, EventArgs e)
{
var grouped = MyBugList.GroupBy(b => b.State).
Select(stateGrp => stateGrp.GroupBy(b => b.Severity));
dataGridView1.Columns.Add("State", "State");
foreach (var strSeverity in MyBugList.Select(b => b.Severity).Distinct())
dataGridView1.Columns.Add(strSeverity, strSeverity);
foreach (var state in grouped)
{
int nRow = dataGridView1.Rows.Add();
dataGridView1.Rows[nRow].Cells[0].Value = state.First().First().State;
foreach (var severity in state)
{
dataGridView1.Rows[nRow].Cells[severity.Key].Value = severity.Count();
}
}
}
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