我知道关于这个话题有很多问题。我经历了所有这些,但似乎没有任何帮助。
如何通过点击列标题进行排序?
我应该如何修改此代码才能完成这项工作?
public partial class Form1 : Form
{
public Form1()
{
List<MyClass> list = new List<MyClass>();
list.Add(new MyClass("Peter", 1202));
list.Add(new MyClass("James", 292));
list.Add(new MyClass("Bond", 23));
BindingSource bs = new BindingSource();
bs.DataSource = list;
DataGridView dg = new DataGridView();
DataGridViewTextBoxColumn c = new DataGridViewTextBoxColumn();
c.Name = "name";
c.DataPropertyName = "Name";
dg.Columns.Add(c);
c = new DataGridViewTextBoxColumn();
c.Name = "number";
c.DataPropertyName = "Number";
dg.Columns.Add(c);
dg.DataSource = bs;
this.Controls.Add((Control)dg);
}
}
class MyClass:IComparable<MyClass>
{
public string Name { get; set; }
public int Number { get; set; }
public MyClass(){}
public MyClass(string name,int number)
{
Name = name;
Number = number;
}
public override string ToString()
{
return string.Format("{0}:{1}",Name,Number);
}
#region IComparable<MyClass> Members
public int CompareTo(MyClass other)
{
return Name.CompareTo(other.Name);
}
#endregion
}
答案 0 :(得分:14)
我记得在我添加排序到我的数据网格时发现可能有用的问题。您可以通过首先将以下类添加到项目中来实现可排序的可绑定列表。它是一个实现BindingList<T>
的列表实现,因此您可以将数据网格绑定到它,并且它还支持排序。我可以在MSDN here
public class SortableBindingList<T> : BindingList<T>
{
private ArrayList sortedList;
private ArrayList unsortedItems;
private bool isSortedValue;
public SortableBindingList()
{
}
public SortableBindingList(IList<T> list)
{
foreach (object o in list)
{
this.Add((T)o);
}
}
protected override bool SupportsSearchingCore
{
get
{
return true;
}
}
protected override int FindCore(PropertyDescriptor prop, object key)
{
PropertyInfo propInfo = typeof(T).GetProperty(prop.Name);
T item;
if (key != null)
{
for (int i = 0; i < Count; ++i)
{
item = (T)Items[i];
if (propInfo.GetValue(item, null).Equals(key))
return i;
}
}
return -1;
}
public int Find(string property, object key)
{
PropertyDescriptorCollection properties =
TypeDescriptor.GetProperties(typeof(T));
PropertyDescriptor prop = properties.Find(property, true);
if (prop == null)
return -1;
else
return FindCore(prop, key);
}
protected override bool SupportsSortingCore
{
get { return true; }
}
protected override bool IsSortedCore
{
get { return isSortedValue; }
}
ListSortDirection sortDirectionValue;
PropertyDescriptor sortPropertyValue;
protected override void ApplySortCore(PropertyDescriptor prop,
ListSortDirection direction)
{
sortedList = new ArrayList();
Type interfaceType = prop.PropertyType.GetInterface("IComparable");
if (interfaceType == null && prop.PropertyType.IsValueType)
{
Type underlyingType = Nullable.GetUnderlyingType(prop.PropertyType);
if (underlyingType != null)
{
interfaceType = underlyingType.GetInterface("IComparable");
}
}
if (interfaceType != null)
{
sortPropertyValue = prop;
sortDirectionValue = direction;
IEnumerable<T> query = base.Items;
if (direction == ListSortDirection.Ascending)
{
query = query.OrderBy(i => prop.GetValue(i));
}
else
{
query = query.OrderByDescending(i => prop.GetValue(i));
}
int newIndex = 0;
foreach (object item in query)
{
this.Items[newIndex] = (T)item;
newIndex++;
}
isSortedValue = true;
this.OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1));
}
else
{
throw new NotSupportedException("Cannot sort by " + prop.Name +
". This" + prop.PropertyType.ToString() +
" does not implement IComparable");
}
}
protected override void RemoveSortCore()
{
int position;
object temp;
if (unsortedItems != null)
{
for (int i = 0; i < unsortedItems.Count; )
{
position = this.Find("LastName",
unsortedItems[i].GetType().
GetProperty("LastName").GetValue(unsortedItems[i], null));
if (position > 0 && position != i)
{
temp = this[i];
this[i] = this[position];
this[position] = (T)temp;
i++;
}
else if (position == i)
i++;
else
unsortedItems.RemoveAt(i);
}
isSortedValue = false;
OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1));
}
}
public void RemoveSort()
{
RemoveSortCore();
}
protected override PropertyDescriptor SortPropertyCore
{
get { return sortPropertyValue; }
}
protected override ListSortDirection SortDirectionCore
{
get { return sortDirectionValue; }
}
}
有了这个,您需要对上面发布的代码进行的唯一更改是根据列表创建一个SortableBindingList并绑定到可排序列表,而不是标准列表,如下所示:
List<MyClass> list = new List<MyClass>();
list.Add(new MyClass("Peter", 1202));
list.Add(new MyClass("James", 292));
list.Add(new MyClass("Bond", 23));
// Added sortable list...
SortableBindingList<MyClass> sortableList = new SortableBindingList<MyClass>(list);
BindingSource bs = new BindingSource();
bs.DataSource = sortableList; // Bind to the sortable list
这足以让你前进。
答案 1 :(得分:4)
以下是真正帮助我的博文。
Presenting the SortableBindableList
另外,请查看How do I implement automatic sorting of DataGridView?,其中包含此示例和另一个库。