如何从WPF中的对象列表创建TreeView

Question

我有一个引用ID，Name和ParentID的对象列表。我试图创建树视图。但它没有显示任何东西。你能帮我创建一个treeView，我分享下面的代码。

public class WorkFlowScriptIDDataStore 
{ 
    public string Id;   
    public string Name; 
    public string ParentId; 

    public List<WorkFlowScriptIDDataStore> Subcategories; 
    public void Clear() 
    { 
     Id = ""; 
     Name = ""; 
     ParentId = ""; 
    } 
} 
private void PopulateTreeView() 
{ 
     List<WorkFlowScriptIDDataStore> localstore = new   List<WorkFlowScriptIDDataStore>(); 
     List<WorkFlowScriptIDDataStore> WorkFlowScriptIDDataList = new List<WorkFlowScriptIDDataStore>(); 
     WorkFlowScriptIDDataList.Clear(); 

     int i = 0; 
     foreach (string node in CurrentScriptids) 
     { 
      WorkFlowScriptIDDataList.Add(new WorkFlowScriptIDDataStore()); 
      if (node.Contains(StatusCodes.TAC_TXT_SCENARIOINDEX)) 
      { 
       datamgm = new TestScenarioConfigurationManager(LayoutConfigurationManager.GetInstance()); 
       WorkFlowScriptIDDataList[i].Id = node; 
       WorkFlowScriptIDDataList[i].Name = datamgm.GetValue(node, "Name"); 
       WorkFlowScriptIDDataList[i].ParentId = sessionmgm.ScriptID; 
      } 
      else if (node.Contains(StatusCodes.TAC_TXT_SEQUENCEINDEX)) 
      { 
       datamgm = new TestSequenceConfigurationManager(LayoutConfigurationManager.GetInstance()); 
       WorkFlowScriptIDDataList[i].Id = node; 
       WorkFlowScriptIDDataList[i].Name = datamgm.GetValue(node, "Name"); 
       WorkFlowScriptIDDataList[i].ParentId = sessionmgm.ScriptID; 
      } 
      else if (node.Contains(StatusCodes.TAC_TXT_CASEINDEX)) 
      { 
       datamgm = new TestCaseConfigurationManager(LayoutConfigurationManager.GetInstance()); 
       WorkFlowScriptIDDataList[i].Id = node; 
       WorkFlowScriptIDDataList[i].Name = datamgm.GetValue(node, "Name"); 
       WorkFlowScriptIDDataList[i].ParentId = sessionmgm.ScriptID; 
      } 
      else 
      { 
       datamgm = new TestStepConfigurationManager(LayoutConfigurationManager.GetInstance()); 
       WorkFlowScriptIDDataList[i].Id = node; 
       WorkFlowScriptIDDataList[i].Name = datamgm.GetValue(node, "Name"); 
       WorkFlowScriptIDDataList[i].ParentId = sessionmgm.ScriptID; 
      } 
      i++; 
     } 
     foreach (var item in WorkFlowScriptIDDataList) 
     { 
      localstore.Add(item); 
     } 
     while (StartWithTreeviewItem(localstore).Count > 0) 
     { 
      GetTreeviewItems(ref localstore); 
     } 
     //Creation -TreeView 
     IEnumerable<WorkFlowScriptIDDataStore> data = WorkFlowScriptIDDataList; 
     var lookup = data.ToLookup(foo => foo.ParentId, 
      foo => new TreeItem<object>() { Item = foo }); 
     foreach (var node in lookup.SelectMany(x => x)) 
      node.Children = lookup[((WorkFlowScriptIDDataStore)(node.Item)).Name]; 
     var rootNodes = lookup[null]; 
     treeView.ItemsSource = rootNodes; 

} 

private List<WorkFlowScriptIDDataStore> StartWithTreeviewItem(List<WorkFlowScriptIDDataStore> lst) 
    { 
     return lst.Where(item => item.Id.StartsWith("TSC") || 
      item.Id.StartsWith("TSQ") || item.Id.StartsWith("TC")).ToList(); 
    } 

private void GetTreeviewItems(ref List<WorkFlowScriptIDDataStore> nodeList) 
    { 
     List<string> tempIDList = new List<string>(); 
     List<string> tempPrereqList = new List<string>(); 
     string currentID = string.Empty; 
     List<WorkFlowScriptIDDataStore> tempstore = new List<WorkFlowScriptIDDataStore>(); 

     configdoc = XDocument.Load(FilePaths.appWorkflowPath + "Workflow" + ".xml"); 
     for (int i = 0; i <= nodeList.Count; i++) 
     { 
      if (nodeList.Count > i) 
      { 
       if (nodeList.Count > 0) 
       { 
        if (nodeList[i].Id.StartsWith("TSC") || 
        nodeList[i].Id.StartsWith("TSQ") || nodeList[i].Id.StartsWith("TC")) 
        { 
         foreach (XElement xe in configdoc.Descendants("TAWorkFlow")) 
         { 
          if (nodeList[i].Id == xe.Element("UniqueID").Value) 
          { 
           tempIDList = xe.Element("ScriptID").Value.Split(new char[] { ',' }, 
             StringSplitOptions.RemoveEmptyEntries).ToList<string>(); 
           tempPrereqList = xe.Element("Prerequisite").Value.Split(new char[] { ',' }, 
             StringSplitOptions.RemoveEmptyEntries).ToList<string>(); 
           break; 
          } 
         } 

         currentID = nodeList[i].Id; 
         tempIDList.Reverse(); 
         tempPrereqList.Reverse(); 
         int k = 0; 
         tempstore.Clear(); 
         nodeList.RemoveAt(i); 
         foreach (string id in tempIDList) 
         { 
          tempstore.Add(new WorkFlowScriptIDDataStore()); 
          tempstore[k].Id = id; 
          tempstore[k].Name = tempPrereqList[k]; 
          tempstore[k].ParentId = currentID; 
          int j = i; 
          WorkFlowScriptIDDataList.Insert(j + 1, tempstore[k]); 
          nodeList.Insert(j, tempstore[k]); 
          j++; 
          k++; 
         } 
        }      
       } 
      } 
     } 
    } 

Answer 1

您需要在WorkFlowScriptIDDataStore类中使用属​​性而不是变量。请尝试下面的示例。

<TreeView x:Name="treeView"> 
     <TreeView.ItemTemplate> 
      <HierarchicalDataTemplate DataType="{x:Type local:WorkFlowScriptIDDataStore}" ItemsSource="{Binding Subcategories}"> 
       <TextBlock Text="{Binding Name}" /> 
      </HierarchicalDataTemplate> 
     </TreeView.ItemTemplate> 
    </TreeView> 

public partial class MainWindow : Window 
{ 
    public MainWindow() 
    { 
     InitializeComponent(); 
     WorkFlowScriptIDDataStore workFlowScriptIdDataStore = new WorkFlowScriptIDDataStore() 
     { 
      Id="1", 
      Name = "Name", 
      ParentId = "-1", 
      Subcategories = new List<WorkFlowScriptIDDataStore>() 
      { 
       new WorkFlowScriptIDDataStore() 
       { 
        Id="1", 
        Name = "Name23", 
        ParentId = "-1", 
       }, 
       new WorkFlowScriptIDDataStore() 
       { 
        Id="2", 
        Name = "Name1", 
        ParentId = "-1", 
       }, 
      } 
     }; 

     List<WorkFlowScriptIDDataStore> lst = new List<WorkFlowScriptIDDataStore>() { workFlowScriptIdDataStore }; 

     treeView.ItemsSource = lst; 
    } 
} 

public class WorkFlowScriptIDDataStore 
{ 
    public string Id { get; set; } 
    public string Name { get; set; } 
    public string ParentId { get; set; } 

    public List<WorkFlowScriptIDDataStore> Subcategories { get; set; } 
    public void Clear() 
    { 
     Id = ""; 
     Name = ""; 
     ParentId = ""; 
    } 
}