TreeView创建IHierarchicalDataSource类型的数据源实现
2020-04-24 22:05:17
供稿：网友
IHierarchicalDataSource实现:
public class InsHierarchyData : IHierarchyData, ICustomTypeDescriptor
{
private DataRowView item;
private string dataParentIdField;
private string dataIdField;
private string displayField;
public InsHierarchyData(string dataParentIdField, string dataIdField,string displayField, DataRowView item)
{
this.item = item;
this.dataParentIdField = dataParentIdField;
this.dataIdField = dataIdField;
this.displayField = displayField;
}
bool IHierarchyData.HasChildren
{
get
{
foreach (DataRowView row in item.DataView)
{
object[] array1 = row.Row.ItemArray;
object[] array2 = item.Row.ItemArray;
string a = row[dataParentIdField].ToString();
string b = item[dataIdField].ToString();
if (a == b)
return true;
}
return false;
}
}
object IHierarchyData.Item
{
get
{
return item;
}
}
public override string ToString()
{
return item[displayField].ToString();
}
string IHierarchyData.Path
{
get
{
string path = "/*[position()=1]";
GetPath(item, ref path);
return path;
}
}
void GetPath(DataRowView crow, ref string path)
{
foreach (DataRowView row in item.DataView)
{
string c, d;
c = crow.Row.ItemArray[2].ToString();
d = crow.Row.ItemArray[0].ToString();
string a = crow[dataParentIdField].ToString();
string b = row[dataIdField].ToString();
if (a == b)
{
path = "/*[position()=1]" + path;
}
}
}
string IHierarchyData.Type
{
get { return displayField; }
}
IHierarchicalEnumerable IHierarchyData.GetChildren()
{
InsHierarchicalEnumerable children = new InsHierarchicalEnumerable();
foreach (DataRowView row in item.DataView)
{
string a = row[dataParentIdField].ToString();
string b = item[dataIdField].ToString();
if (a == b)
children.Add(new InsHierarchyData(dataParentIdField, dataIdField,displayField, row));
}
return children;
}
IHierarchyData IHierarchyData.GetParent()
{
foreach (DataRowView row in item.DataView)
{
string a = item[dataParentIdField].ToString();
string b = row[dataIdField].ToString();
if (a == b)
return new InsHierarchyData(dataParentIdField, dataIdField,displayField, row);
}
return null;
}
System.ComponentModel.AttributeCollection ICustomTypeDescriptor.GetAttributes()
{
return TypeDescriptor.GetAttributes(this, true);
}
string ICustomTypeDescriptor.GetClassName()
{
return TypeDescriptor.GetClassName(this, true);
}
string ICustomTypeDescriptor.GetComponentName()
{
return TypeDescriptor.GetComponentName(this, true);
}
TypeConverter ICustomTypeDescriptor.GetConverter()
{
return TypeDescriptor.GetConverter(this, true);
}
EventDescriptor ICustomTypeDescriptor.GetDefaultEvent()
{
return TypeDescriptor.GetDefaultEvent(this, true);
}
PropertyDescriptor ICustomTypeDescriptor.GetDefaultProperty()
