我有一个问题，无法将我的对象列表填充到我的树形视图中。我一直在谷歌上寻找解决方案，找到了一些与我的问题接近的主题，但没有一个能够解决它。
我有一个包含每个对象属性名称和组的列表。
我想像下面这样填充我的树形视图：
+---Group 1
| |
| +--------object.Name <--
| +--------object.Name <-- all objects with object.Group = Group 1
| +--------object.Name <--
|
+---Group 2
| |
| +--------object.Name <--
| +--------object.Name <-- all objects with object.Group = Group 2
| +--------object.Name <--
|
等等还有其他的。
谢谢。
工作得非常好，谢谢。我只是在else的开头和结尾添加了几行代码，如下所示。
private void PopulateTreeView()
{
ListOfObjectsSorted = ListOfObjects.OrderBy(r => r.Group).ToList();
var topNode = new TreeNode("Select all");
treeView1.Nodes.Add(topNode);
string currentGroup = ListOfObjectsSorted.First().Group;
var treeNodes = new List<TreeNode>();
var childNodes = new List<TreeNode>();
foreach (Object obj in ListOfObjectsSorted )
{
if (currentGroup == rule.Group)
childNodes.Add(new TreeNode(obj.Name));
else
{
if (childNodes.Count > 0)
{
treeNodes.Add(new TreeNode(currentGroup, childNodes.ToArray()));
childNodes = new List<TreeNode>();
}
childNodes.Add(new TreeNode(obj.Name));
currentGroup = obj.Group;
}
}
if (childNodes.Count > 0)
{
treeNodes.Add(new TreeNode(currentGroup, childNodes.ToArray()));
}
treeView1.Nodes[0].Nodes.AddRange(treeNodes.ToArray());
}
您的问题是技术性问题还是如何处理它？您可以按照object.Group进行排序，然后每当组发生变化时创建一个顶层节点。
编辑： 以下是一些示例代码，我尚未测试，因此请将其视为指南：
string currentGroup = null;
List<TreeNode> treeNodes = new List<TreeNode>();
List<TreeNode> childNodes = new List<TreeNode>();
foreach (BusinessObject obj in objectList)
{
if (currentGroup == obj.Group)
childNodes.Add(new TreeNode(obj.Name));
else
{
if (childNodes.Count > 0)
{
treeNodes.Add(new TreeNode(currentGroup, childNodes.ToArray()));
childNodes = new List<TreeNode>();
}
currentGroup = obj.Group;
}
}
if (childNodes.Count > 0)
{
treeNodes.Add(new TreeNode(currentGroup, childNodes.ToArray()));
}
treeView.Nodes.AddRange(treeNodes.ToArray());
Me.Cursor = Cursors.WaitCursor
If rtb.Visible Then line = rtb.Lines
Dim i, j As Integer
Dim myLst As New ListBox
Dim nod0 As New TreeNode
Dim nod1 As New TreeNode
Dim nodGet As New TreeNode
Dim nodSet As New TreeNode
'Aktualna pozicia
If trw.SelectedNode Is Nothing Then
Else
nodGet = trw.SelectedNode
End If
For Each nod0 In trw.Nodes
If nod0.IsExpanded Then
myLst.Items.Add(nod0.Tag)
For Each nod1 In nod0.Nodes
If nod1.IsExpanded Then myLst.Items.Add(nod1.Tag)
Next
End If
Next
Dim cntr() As Integer = {-1, -1, -1}
trw.Nodes.Clear()
trw.ShowPlusMinus = False
trw.ShowRootLines = False
trw.CheckBoxes = False
For i = 0 To UBound(line)
If Mid(line(i), 1, 1) = "\" Then
j = line(i).IndexOf(dod)
If j > 0 Then
s = Mid(line(i), 1, j)
Else
s = line(i)
End If
If Mid(s, 1, 4) = "\\\\" Then
trw.Nodes.Add(Mid(s, 5))
cntr(0) = cntr(0) + 1
cntr(1) = -1
cntr(2) = -1
trw.Nodes(cntr(0)).Tag = s
trw.Nodes(cntr(0)).ImageIndex = 4
trw.Nodes(cntr(0)).SelectedImageIndex = 5
If trw.Nodes(cntr(0)).Tag = nodGet.Tag Then nodSet = trw.Nodes(cntr(0))
Else
If Mid(s, 1, 3) = "\\\" Then
If cntr(0) = -1 Then trw.Nodes.Add("...") : cntr(0) = 0 : cntr(1) = -1
trw.Nodes(cntr(0)).Nodes.Add(Mid(s, 4))
cntr(1) = cntr(1) + 1
cntr(2) = -1
trw.Nodes(cntr(0)).Nodes(cntr(1)).Tag = trw.Nodes(cntr(0)).Tag.ToString & eol & s
trw.Nodes(cntr(0)).Nodes(cntr(1)).ImageIndex = 1
trw.Nodes(cntr(0)).Nodes(cntr(1)).SelectedImageIndex = 2
If trw.Nodes(cntr(0)).Nodes(cntr(1)).Tag = nodGet.Tag Then nodSet = trw.Nodes(cntr(0)).Nodes(cntr(1))
Else
If Mid(s, 1, 2) = "\\" Then
If cntr(0) = -1 Then trw.Nodes.Add("...") : cntr(0) = 0 : cntr(1) = -1
If cntr(1) = -1 Then trw.Nodes(cntr(0)).Nodes.Add("...") : cntr(1) = 0 : cntr(2) = -1
trw.Nodes(cntr(0)).Nodes(cntr(1)).Nodes.Add(Mid(s, 3))
cntr(2) = cntr(2) + 1
trw.Nodes(cntr(0)).Nodes(cntr(1)).Nodes(cntr(2)).Tag = trw.Nodes(cntr(0)).Nodes(cntr(1)).Tag.ToString & eol & s
trw.Nodes(cntr(0)).Nodes(cntr(1)).Nodes(cntr(2)).ImageIndex = 3
trw.Nodes(cntr(0)).Nodes(cntr(1)).Nodes(cntr(2)).SelectedImageIndex = 4
If trw.Nodes(cntr(0)).Nodes(cntr(1)).Nodes(cntr(2)).Tag = nodSet.Tag Then nodSet = trw.Nodes(cntr(0)).Nodes(cntr(1)).Nodes(cntr(2))
End If
End If
End If
End If
Next i
'Navrat na aktualnu poziciu
Application.DoEvents()
For i = 0 To myLst.Items.Count - 1
For Each nod0 In trw.Nodes
If nod0.Tag = myLst.Items(i).ToString Then nod0.Expand()
For Each nod1 In nod0.Nodes
If nod1.Tag = myLst.Items(i).ToString Then nod1.Expand()
Next
Next
Next i
Application.DoEvents()
If nodSet.Tag <> "" Then trw.SelectedNode = nodSet
Catch ex As Exception
MsgBox(ex.ToString, MsgBoxStyle.Exclamation)
Finally
Me.Cursor = Cursors.Default
End Try
public static class TreeNodeHelper
{
public static void PrintProperties(TreeNode parentNode, object obj, int indent, TreeView treeView, ICollection<string> ignoredPropertyNames)
{
string indentString = new string(' ', indent); // used for debugging
if (obj == null)
return;
var objType = obj.GetType();
var properties = objType.GetProperties()
.Where(x => !ignoredPropertyNames.Contains(x.Name))
.ToList();
foreach (var property in properties)
{
if (property.Name.ToUpper().Contains("DiagMessage".ToUpper()))
{
// TODO rem test code
}
var propValue = new object();
if (property.CanRead)
propValue = property.GetValue(obj, null);
if (IsSimpleType(property.PropertyType))
{
Debug.WriteLine("{0}{1}:", indentString, property.Name);
if (parentNode != null)
{
parentNode.Nodes.Add(property.Name,
$"{property.Name}: {(propValue != null ? propValue.ToString() : string.Empty)}");
}
else
{
treeView.Nodes.Add(property.Name,
$"{property.Name}: {(propValue != null ? propValue.ToString() : string.Empty)}");
}
}
else if (typeof(IEnumerable).IsAssignableFrom(property.PropertyType))
{
TreeNode collectionRootNode;
if (parentNode != null)
{
collectionRootNode = parentNode.Nodes.Add(property.Name, property.Name);
}
else
{
collectionRootNode = treeView.Nodes.Add(property.Name, property.Name);
}
Debug.WriteLine("{0}{1}:", indentString, property.Name);
var enumerable = (IEnumerable)propValue;
var count = 0;
foreach (var child in enumerable)
{
count++;
if (!IsSimpleType(child.GetType()))
{
var entryRootNode = collectionRootNode.Nodes.Add($"{property.Name}[{count}]",
$"{property.Name}[{count}]");
PrintProperties(entryRootNode, child, indent + 2, treeView, ignoredPropertyNames);
}
else
{
collectionRootNode.Nodes.Add($"{property.Name}[{count}]", $"{property.Name}[{count}]: {child}");
}
}
}
else
{
TreeNode node;
if (parentNode != null)
{
node = parentNode.Nodes.Add(property.Name, property.Name);
}
else
{
node = treeView.Nodes.Add(property.Name, property.Name);
}
PrintProperties(node, propValue, indent + 2, treeView, ignoredPropertyNames);
}
}
}
public static bool IsSimpleType(Type type)
{
if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>))
{
// nullable type, check if the nested type is simple.
return IsSimpleType(type.GetGenericArguments()[0]);
}
return type.IsPrimitive
|| ((IList)new[]
{
// Structs that are 'simple types', expand on this when needed.
typeof(DateTime),
typeof(DateTimeOffset),
typeof(TimeSpan),
typeof(Guid)
}).Contains(type)
|| type.IsEnum
|| type == typeof(string)
|| type == typeof(decimal);
}
}
TreeNodeHelper.PrintProperties(null, firstMotor, 0, treeView1, new List<string>(new[]{ "Creator", "PlcTag", "PlcComponentCreationInfo" }));
五年后....
调用 >> PrintProperties(null, yourObject, 0);
public void PrintProperties(TreeNode parentNode, object obj, int indent)
{
if (obj == null) return;
string indentString = new string(' ', indent);
Type objType = obj.GetType();
PropertyInfo[] properties = objType.GetProperties();
foreach (PropertyInfo property in properties)
{
object propValue = new object();
if (property.CanRead)
propValue = property.GetValue(obj, null);
if (IsSimpleType(property.PropertyType))
{
//Console.WriteLine("{0}{1}:", indentString, property.Name);
if (parentNode != null)
{
parentNode.Nodes.Add(property.Name, property.Name +": " + (propValue != null ? propValue.ToString() : string.Empty));
}
else
{
treeView.Nodes.Add(property.Name, property.Name + ": " + (propValue != null ? propValue.ToString() : string.Empty));
}
}
else if (typeof(IEnumerable).IsAssignableFrom(property.PropertyType))
{
TreeNode node;
if (parentNode != null)
{
node = parentNode.Nodes.Add(property.Name, property.Name);
}
else
{
node = treeView.Nodes.Add(property.Name, property.Name);
}
//Console.WriteLine("{0}{1}:", indentString, property.Name);
IEnumerable enumerable = (IEnumerable)propValue;
foreach (object child in enumerable)
PrintProperties(node, child, indent + 2);
}
else
{
TreeNode node;
if (parentNode != null)
{
node = parentNode.Nodes.Add(property.Name, property.Name);
}
else
{
node = treeView.Nodes.Add(property.Name, property.Name);
}
PrintProperties(node, propValue, indent + 2);
}
}
}
public static bool IsSimpleType(Type type)
{
return
type.IsValueType ||
type.IsPrimitive ||
new Type[]
{
typeof(String),
typeof(Decimal),
typeof(DateTime),
typeof(DateTimeOffset),
typeof(TimeSpan),
typeof(Guid)
}.Contains(type) ||
Convert.GetTypeCode(type) != TypeCode.Object;
}
treeview语句 :) - saeed