DataGridView使用SortableBindingList

我有一个返回IList 的函数，它是DataGridView的DataSource。 我了解到DataGridView不会对IList进行排序。 我读了这个stackoverflow Q＆A ，我正在尝试实现SortableBindingList。 我一定做错了，因为我的DataGridView是空的。 我还尝试使用TextBox从SortableBindingSource访问一个元素，但也没有。

using Microsoft.SqlServer.Management.Controls; public partial class Form1 : Form { IBusinessLayer businessLayer; IList categories; SortableBindingList catSortable; public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { businessLayer = new BusinessLayer(); categories = businessLayer.GetAllCategories(); catSortable = new SortableBindingList(categories); categoryBindingSource.DataSource = catSortable; categoryDataGridView.DataSource = categoryBindingSource; textBox1.Text = catSortable[0].CategoryName; } } 

我检查了Microsoft.SqlServer.Management.Controls ，这看起来不错吗？

 namespace Microsoft.SqlServer.Management.Controls { public class SortableBindingList : BindingList { public SortableBindingList(); public SortableBindingList(IList list); protected override bool IsSortedCore { get; } protected override ListSortDirection SortDirectionCore { get; } protected override PropertyDescriptor SortPropertyCore { get; } protected override bool SupportsSortingCore { get; } protected override void ApplySortCore(PropertyDescriptor prop, ListSortDirection direction); protected override void RemoveSortCore(); } } 

我非常感谢帮助和帮助我学习。 感谢大家！

Answer 1

试试这个SortableBindingList：

 public class SortableBindingList : BindingList { private bool isSortedValue; ListSortDirection sortDirectionValue; PropertyDescriptor sortPropertyValue; public SortableBindingList() { } public SortableBindingList(IList list) { foreach (object o in list) { this.Add((T)o); } } protected override void ApplySortCore(PropertyDescriptor prop, ListSortDirection direction) { 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 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 PropertyDescriptor SortPropertyCore { get { return sortPropertyValue; } } protected override ListSortDirection SortDirectionCore { get { return sortDirectionValue; } } protected override bool SupportsSortingCore { get { return true; } } protected override bool IsSortedCore { get { return isSortedValue; } } }