我有一个带有datagridview的表单. dataGridView绑定到BindingSource:
public class Address
{
public string State { get; set; }
public string City { get; set; }
public string Street { get; set; }
}
this.addressBindingSource.DataSource = typeof(Address);
this.dataGridView1.DataSource = this.addressBindingSource;
我像这样填写DataSource:
addressBindingSource.DataSource = new BindingList<Address>
{
new Address {State = "S1", City = "C1", Street = "S1"},
new Address {State = "S1", City = "C1", Street = "S2"},
new Address {State = "S1", City = "C1", Street = "S3"},
new Address {State = "S1", City = "C2", Street = "S4"},
new Address {State = "S1", City = "C2", Street = "S5"},
new Address {State = "S1", City = "C2", Street = "S6"},
};
我正在尝试为此datagridview启用排序.我将SortMode设置为Programmatic,用于dataGridView1的所有列.我为ColumnHeaderMouseClick添加了一个事件处理程序:
private Dictionary<int, string> columnIndexPropertyNameDictionary = new Dictionary<int, string>
{
{0, "State"},
{1, "City"},
{2, "Street"},
};
private void dataGridView1_ColumnHeaderMouseClick(object sender, DataGridViewCellMouseEventArgs e)
{
if (e.ColumnIndex < 0)
return;
for (int i = 0; i < dataGridView1.Columns.Count; i++)
{
if (i == e.ColumnIndex)
continue;
dataGridView1.Columns[i].HeaderCell.SortGlyphDirection = SortOrder.None;
}
var column = dataGridView1.Columns[e.ColumnIndex];
if (column.SortMode != DataGridViewColumnSortMode.Programmatic)
return;
var sortGlyphDirection = column.HeaderCell.SortGlyphDirection;
switch (sortGlyphDirection)
{
case SortOrder.None:
case SortOrder.Ascending:
addressBindingSource.Sort = columnIndexPropertyNameDictionary[e.ColumnIndex] + " ASC";
column.HeaderCell.SortGlyphDirection = SortOrder.Descending;
break;
case SortOrder.Descending:
addressBindingSource.Sort = columnIndexPropertyNameDictionary[e.ColumnIndex] + " DESC";
column.HeaderCell.SortGlyphDirection = SortOrder.Ascending;
break;
}
}
排序仍然不起作用.我究竟做错了什么?
解决方法:
问题是开箱即用的BindingList不支持排序!我知道 – 听起来很蠢,但就是这样.
您需要实现自己的SortableBindingList.代码的示例如下.
此代码来自here,我没有时间彻底检查.如果它不起作用然后google术语SortableBindingList,有很多实现.
public class SortableBindingList<t> : BindingList<t>
{
private bool m_Sorted = false;
private ListSortDirection m_SortDirection = ListSortDirection.Ascending;
private PropertyDescriptor m_SortProperty = null;
protected override bool SupportsSortingCore
{
get
{
return true;
}
}
protected override bool IsSortedCore
{
get
{
return m_Sorted;
}
}
protected override ListSortDirection SortDirectionCore
{
get
{
return m_SortDirection;
}
}
protected override PropertyDescriptor SortPropertyCore
{
get
{
return m_SortProperty;
}
}
protected override void ApplySortCore(PropertyDescriptor prop, ListSortDirection direction)
{
m_SortDirection = direction;
m_SortProperty = prop;
var listRef = this.Items as List<t>;
if (listRef == null)
return;
var comparer = new SortComparer<t>(prop, direction);
listRef.Sort(comparer);
OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1));
}
}