Question

我在思考我正在努力建立的解决方案时遇到了麻烦，也许这里的某个人能够引导我走向正确的方向。

我有一个属于流程流的进程列表，这些进程可能有子节点，而这些子节点可能也有子节点等等。

列表如下所示：

ProcID     ChildOFID
1          0 (means no child)
2          1
3          2
4          3
5          3
6          5

正如你所看到的，Proc“3”包含2个孩子，其中一个（5）也有一个孩子（6）。

我想迭代这个列表并在画布上为它们绘制对象。

现在我有以下代码，但它要求我为我想要显示的每个级别编写一个循环。

int prev_location_left = 0;            
        int prev_location_top = 0;

        // Select Last ProcessStep (has no PreID!)
        var lastProcess = (from p in processlist
                           where p.PreID == 0
                           select p).FirstOrDefault<ProcessStep>();

        if (lastProcess != null)
        {
            create_processStep(lastProcess.ProcessID,
                                lastProcess.Name,
                                lastProcess.ProcessTypeID,
                                (900),
                                (30),
                                lastProcess.CummulativeCT,
                                lastProcess.WaitingTimeActual,
                                lastProcess.ValueAddTimeActual,
                                lastProcess.ProcessStepTime);

            prev_location_left = 900;
            prev_location_top = 30;
        }

        // Select all the ProcessSteps that are a child of the last(first) one.
        var listChilds = (from p in processlist
                          where p.PreID == lastProcess.ProcessID
                          select p);


        int childscount = listChilds.Count();
        int cnt = 0;

        foreach (ProcessStep ps in listChilds)
        {
            create_processStep(ps.ProcessID,
                ps.Name,
                ps.ProcessTypeID,
                (prev_location_left - (150) ),
                (30 + (60 *cnt)),
                ps.CummulativeCT,
                ps.WaitingTimeActual,
                ps.ValueAddTimeActual,
                ps.ProcessStepTime);


            var listChilds2 = (from p in processlist
                              where p.PreID == ps.ProcessID
                              select p);

            int cnt2 = 0;

            foreach (ProcessStep ps2 in listChilds2)
            {
                create_processStep(ps2.ProcessID,
                    ps2.Name,
                    ps2.ProcessTypeID,
                    (prev_location_left - (300) ),
                    (30 + (60 *cnt2)),
                    ps2.CummulativeCT,
                    ps2.WaitingTimeActual,
                    ps2.ValueAddTimeActual,
                    ps2.ProcessStepTime);


                var listChilds3 = (from p in processlist
                                   where p.PreID == ps2.ProcessID
                                   select p);

                int cnt3 = 0;

                foreach (ProcessStep ps3 in listChilds3)
                {
                    create_processStep(ps3.ProcessID,
                        ps3.Name,
                        ps3.ProcessTypeID,
                        (prev_location_left - (450)),
                        (30 + (60 * cnt2)),
                        ps3.CummulativeCT,
                        ps3.WaitingTimeActual,
                        ps3.ValueAddTimeActual,
                        ps3.ProcessStepTime);
                    cnt3 = cnt3 + 1;
                }


                cnt2 = cnt2 + 1;
            }


            cnt = cnt + 1;
        }

所以需要做的是：

获取最后一个进程（PreId == 0）
检查他的孩子是什么，并在画布上绘制：左-150，前30名的第一个孩子，前90名的第二个，前150名的第三个，依此类推。

现在，对于每个被发现的孩子，我还需要检查他们是否有孩子，并再次采用相同的逻辑，我无法将其作为一个无限循环。

帮助！：）

Answer 1

您可以创建递归父/子对象并使用您的视图绑定到它。以下是使用您提供的数据的一个非常基本的示例。

<强> MainPage.xaml中

<UserControl x:Class="SilverlightApplication4.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
xmlns:local="clr-namespace:SilverlightApplication4"
d:DesignHeight="300" d:DesignWidth="400">

<UserControl.DataContext>
    <local:MainPage_ViewModel/>
</UserControl.DataContext>

<Canvas>
    <local:RecursiveView DataContext="{Binding RecursiveObject}"/>
</Canvas>

<强> MainPage_ViewModel.cs

public class MainPage_ViewModel
{
    public MainPage_ViewModel()
    {
        List<KeyValuePair<int, int>> collection = new List<KeyValuePair<int, int>>()
        {
            new KeyValuePair<int,int>(1,0),
            new KeyValuePair<int,int>(2,1),
            new KeyValuePair<int,int>(3,2),
            new KeyValuePair<int,int>(4,3),
            new KeyValuePair<int,int>(5,3),
            new KeyValuePair<int,int>(6,5)
        };

        KeyValuePair<int, int> parent = collection.Where(kvp => kvp.Value == 0).First();
        collection.Remove(parent);

        RecursiveObject recursiveObject = new RecursiveObject()
        {
            root = parent.Key
        };

        populateChildren(recursiveObject, collection);

        this.RecursiveObject = recursiveObject;
    }

    public RecursiveObject RecursiveObject 
    {
        get { return recursiveObject; }
        set { recursiveObject = value; }
    }
    private RecursiveObject recursiveObject;


    private void populateChildren(RecursiveObject parent, List<KeyValuePair<int, int>> list)
    {
        List<KeyValuePair<int, int>> children = list.Where(kvp => kvp.Value == parent.root).ToList();
        children.ForEach(child => list.Remove(child));
        children.ForEach(child =>
        {
            RecursiveObject newChild = new RecursiveObject() { root = child.Key };
            parent.Children.Add(newChild);
            populateChildren(newChild, list);
        });
    }
}

<强> RecursiveObject.cs

public class RecursiveObject
{
    public int root { get; set; }
    public List<RecursiveObject> Children 
    {
        get { return children; }
        set { children = value; }
    }
    private List<RecursiveObject> children = new List<RecursiveObject>();
}

<强> RecursiveView.xaml

<UserControl x:Class="SilverlightApplication4.RecursiveView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
xmlns:local="clr-namespace:SilverlightApplication4"
d:DesignHeight="300" d:DesignWidth="400">

<StackPanel Margin="30,0,0,0">
    <TextBlock Text="{Binding root}"/>
    <ItemsControl ItemsSource="{Binding Children}">
        <ItemsControl.ItemTemplate>
            <DataTemplate>
                <local:RecursiveView DataContext="{Binding}"/>
            </DataTemplate>
        </ItemsControl.ItemTemplate>
    </ItemsControl>
</StackPanel>

输出图片：

enter image description here

我只是在每个孩子的左边放置一个“30”的边距，但你可以将它调整为你想要的任何东西。不确定这是否有帮助，我只是觉得尝试这是一个有趣的挑战：）

Silverlight 4：需要Iteration的帮助

1 个答案: