在添加到gridview之前分组列表 [英] Grouping list before added to the gridview

问题描述

我有这个代码添加项目列表

I have this code that added items to list

private void GetParts(bool AllObjects)
{
    ModelObjectEnumerator ImportModel = null;
    List<Beam> parts = new List<Beam>();
    if (AllObjects)
    {
        ImportModel = MyModel.GetModelObjectSelector().GetAllObjectsWithType(ModelObject.ModelObjectEnum.BEAM);
    }
    else
    {
        TSMUI.ModelObjectSelector GetSelectedObjects = new TSMUI.ModelObjectSelector();
        ImportModel = GetSelectedObjects.GetSelectedObjects();
    }

    while (ImportModel.MoveNext())
    {
        Beam ThisBeam = ImportModel.Current as Beam;

        if (ThisBeam != null)
        {
            parts.Add(ThisBeam);

        }
    }

之后，我应该遍历所有要添加到GridView的项目，如下所示

After that I'm supposed to iterate through all items to added to the GridView like this

for (int i = 0; i < parts.Count; i++)
{ 
        DataRow row = dt.NewRow();

        var partMark = string.Empty;
        parts[i].GetReportProperty("PART_POS", ref partMark);
        row[0] = partMark;
        row[1] = parts[i].Profile.ProfileString;
        int num = 0;
        row[2] = parts[i].GetReportProperty("MODEL_TOTAL", ref num);
        double length = 0;
        parts[i].GetReportProperty("LENGTH", ref length);
        row[3] = length;
        dt.Rows.Add(row);
}

但在我这样做之前，我想使用（partMark，length）和Sum（num）对项目进行分组。



我该怎么做？提前致谢。



我尝试过的事情：



我尝试使用GroupBy技术，但不幸的是我没有成功

but before I do that I want to group items using (partMark ,length ) and Sum(num ).

How can I do that?Thanks in advance.

What I have tried:

I try to use GroupBy technique but unfortunately I did not succeed

推荐答案

鉴于你没有使用SQL，我将从一个项目列表的字典开始。关键是你的价值观。因此，您构建了一个列表字典，这是按对象分组的集合。然后从那里去

Given you're not using SQL, I would start with a dictionary of a list of items. The key is your group by value. So you build a dictionary of lists, that's your collection of grouped by objects. Then go from there

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