记录转化为有层次结构的树状列表的通用算法
| 问题说明: |
|
|
|---|---|---|
| 解决方法: |
|
public
class
CollectionHelper
{
private
static
ArrayList Fill(
int
pID,
int
level, ArrayList list)
{
ArrayList returnList
=
new
ArrayList();
foreach
(
object
obj
in
list)
{
int
typePID
=
(
int
)ReflectionUtil.GetProperty(obj,
"
PID
"
);
int
typeID
=
(
int
)ReflectionUtil.GetProperty(obj,
"
ID
"
);
string
typeName
=
ReflectionUtil.GetProperty(obj,
"
Name
"
)
as
string
;
if
(pID
==
typePID)
{
string
newName
=
new
string
(
'
-
'
, level
*
4
)
+
typeName;
ReflectionUtil.SetProperty(obj,
"
Name
"
, newName);
returnList.Add(obj);
returnList.AddRange(Fill(typeID, level
+
1
, list));
}
}
return
returnList;
}
///
<summary>
///
生成有层次结构的列表
///
</summary>
///
<param name="list">
具有Name,ID,PID成员的任何集合
</param>
///
<returns></returns>
public
static
ArrayList GetTreeItems(ArrayList list)
{
return
Fill(
-
1
,
0
, list);
}
}
public
sealed
class
ReflectionUtil
{
private
ReflectionUtil()
{ }
public
static
BindingFlags bf
=
BindingFlags.DeclaredOnly
|
BindingFlags.Public
|
BindingFlags.NonPublic
|
BindingFlags.Instance
|
BindingFlags.Static;
public
static
void
SetProperty(
object
obj,
string
name,
object
value)
{
PropertyInfo fi
=
obj.GetType().GetProperty(name, bf);
fi.SetValue(obj, value,
null
);
}
public
static
object
GetProperty(
object
obj,
string
name)
{
PropertyInfo fi
=
obj.GetType().GetProperty(name, bf);
return
fi.GetValue(obj,
null
);
}
}
效果图如下