C# 使用业务对象对DataGridView列进行排序
我正在设置DataGridView，如下所示：C# 使用业务对象对DataGridView列进行排序,c#,.net,datagridview,C#,.net,Datagridview,我正在设置DataGridView，如下所示： jobs = new List<DisplayJob>(); uxJobList.AutoGenerateColumns = false; jobListBindingSource.DataSource = jobs; uxJobList.DataSource = jobListBindingSource; int newColumn;
jobs = new List<DisplayJob>();
uxJobList.AutoGenerateColumns = false;
jobListBindingSource.DataSource = jobs;
uxJobList.DataSource = jobListBindingSource;
int newColumn;
newColumn = uxJobList.Columns.Add("Id", "Job No.");
uxJobList.Columns[newColumn].DataPropertyName = "Id";
uxJobList.Columns[newColumn].DefaultCellStyle.Format = Global.JobIdFormat;
uxJobList.Columns[newColumn].DefaultCellStyle.Font = new Font(uxJobList.DefaultCellStyle.Font, FontStyle.Bold);
uxJobList.Columns[newColumn].AutoSizeMode = DataGridViewAutoSizeColumnMode.None;
uxJobList.Columns[newColumn].Width = 62;
uxJobList.Columns[newColumn].Resizable = DataGridViewTriState.False;
uxJobList.Columns[newColumn].SortMode = DataGridViewColumnSortMode.Automatic;
:
:
但是，列排序不起作用。让它工作的最佳方法是什么？我认为您的类必须实现
IComparableBruno Figueiredo最简单的方法之一是使用该类包装显示作业列表。该类实现了一些必需的接口，这些接口支持在DataGridView中进行排序和筛选。这是捷径。不过，它工作得很好——唯一需要注意的是，如果从DataGridView中强制转换内容，则需要转换到包装器对象（ObjectView），而不是实际的项（DisplayJob）
不那么懒惰的方法是创建一个实现IBindingList的自定义集合时间，在其中实现排序方法。如果您想支持对集合进行排序和搜索，则需要从BindingList参数化类型派生一个类，并重写一些基类方法和属性 最好的方法是扩展BindingList并执行以下操作：
protected override bool SupportsSearchingCore
{
get
{
return true;
}
}
protected override bool SupportsSortingCore
{
get { return true; }
}
ListSortDirection sortDirectionValue;
PropertyDescriptor sortPropertyValue;
protected override void ApplySortCore(PropertyDescriptor prop,
ListSortDirection direction)
{
sortedList = new ArrayList();
// Check to see if the property type we are sorting by implements
// the IComparable interface.
Type interfaceType = prop.PropertyType.GetInterface("IComparable");
if (interfaceType != null)
{
// If so, set the SortPropertyValue and SortDirectionValue.
sortPropertyValue = prop;
sortDirectionValue = direction;
unsortedItems = new ArrayList(this.Count);
// Loop through each item, adding it the the sortedItems ArrayList.
foreach (Object item in this.Items) {
sortedList.Add(prop.GetValue(item));
unsortedItems.Add(item);
}
// Call Sort on the ArrayList.
sortedList.Sort();
T temp;
// Check the sort direction and then copy the sorted items
// back into the list.
if (direction == ListSortDirection.Descending)
sortedList.Reverse();
for (int i = 0; i < this.Count; i++)
{
int position = Find(prop.Name, sortedList[i]);
if (position != i) {
temp = this[i];
this[i] = this[position];
this[position] = temp;
}
}
isSortedValue = true;
// Raise the ListChanged event so bound controls refresh their
// values.
OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1));
}
else
// If the property type does not implement IComparable, let the user
// know.
throw new NotSupportedException("Cannot sort by " + prop.Name +
". This" + prop.PropertyType.ToString() +
" does not implement IComparable");
}
ListSortDirection-sortdirection-value；
PropertyDescriptor sortPropertyValue；
受保护的覆盖无效ApplySortCore（PropertyDescriptor属性，
ListSortDirection（方向）
{
sortedList=新的ArrayList（）；
//检查我们正在按实现排序的属性类型
//IComparable接口。
类型interfaceType=prop.PropertyType.GetInterface（“IComparable”）；
if（interfaceType！=null）
{
//如果是，请设置SortPropertyValue和SortDirectionValue。
sortPropertyValue=prop；
sortDirectionValue=方向；
unsortedItems=新的ArrayList（this.Count）；
//循环遍历每个项目，将其添加到sortedItems ArrayList中。
foreach（此.Items中的对象项）{
sortedList.Add（属性GetValue（项目））；
未分类。添加（项）；
}
//在ArrayList上调用Sort。
sortedList.Sort（）；
温度；
//检查排序方向，然后复制已排序的项目
//回到名单上。
if（方向==ListSortDirection.Descending）
sortedList.Reverse（）；
for（int i=0；i如果你需要更多的信息，你可以随时去那里得到所有的解释。Daok的解决方案是正确的。这也常常是超出其价值的工作 懒人获得所需功能的方法是从业务对象中创建和填充一个DataTable，并将DataGridView绑定到该DataTable 有很多用例是这种方法无法处理的（比如编辑），而且它显然浪费了时间和空间。正如我所说，它很懒 但是它很容易编写，并且生成的代码比
IBindingList另外，您已经编写了很多代码，或者至少编写了类似的代码：您为定义DataTable而编写的代码使您无需编写代码来创建DataGridView的列，因为绑定DataGridView时，DataGridView将在DataTable之外构造其列。Daok建议的MS文章让我走上了正确的轨道，但我对SortableSearchableList的MSs实现不满意。我发现这个实现非常奇怪，当一列中有重复的值时，它不能很好地工作。它也不会覆盖IsSortedCore，这似乎是DataGridView所需要的。如果未覆盖IsSortedCore，则不会显示搜索图示符，并且无法在升序和降序之间切换 请参阅下面我的SortableSearchableList版本。在ApplySortCore（）中，它使用设置为匿名方法的比较委托进行排序。此版本还支持为特定属性设置自定义比较，派生类可以使用AddCustomCompare（）添加该属性 我不确定版权声明是否仍然适用，但我只是把它留在了
//---------------------------------------------------------------------
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//THIS CODE AND INFORMATION ARE PROVIDED AS IS WITHOUT WARRANTY OF ANY
//KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
//IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
//PARTICULAR PURPOSE.
//---------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Reflection;
using System.Collections;
namespace SomethingSomething
{
/// <summary>
/// Supports sorting of list in data grid view.
/// </summary>
/// <typeparam name="T">Type of object to be displayed in data grid view.</typeparam>
public class SortableSearchableList<T> : BindingList<T>
{
#region Data Members
private ListSortDirection _sortDirectionValue;
private PropertyDescriptor _sortPropertyValue = null;
/// <summary>
/// Dictionary from property name to custom comparison function.
/// </summary>
private Dictionary<string, Comparison<T>> _customComparisons = new Dictionary<string, Comparison<T>>();
#endregion
#region Constructors
/// <summary>
/// Default constructor.
/// </summary>
public SortableSearchableList()
{
}
#endregion
#region Properties
/// <summary>
/// Indicates if sorting is supported.
/// </summary>
protected override bool SupportsSortingCore
{
get
{
return true;
}
}
/// <summary>
/// Indicates if list is sorted.
/// </summary>
protected override bool IsSortedCore
{
get
{
return _sortPropertyValue != null;
}
}
/// <summary>
/// Indicates which property the list is sorted.
/// </summary>
protected override PropertyDescriptor SortPropertyCore
{
get
{
return _sortPropertyValue;
}
}
/// <summary>
/// Indicates in which direction the list is sorted on.
/// </summary>
protected override ListSortDirection SortDirectionCore
{
get
{
return _sortDirectionValue;
}
}
#endregion
#region Methods
/// <summary>
/// Add custom compare method for property.
/// </summary>
/// <param name="propertyName"></param>
/// <param name="compareProperty"></param>
protected void AddCustomCompare(string propertyName, Comparison<T> comparison)
{
_customComparisons.Add(propertyName, comparison);
}
/// <summary>
/// Apply sort.
/// </summary>
/// <param name="prop"></param>
/// <param name="direction"></param>
protected override void ApplySortCore(PropertyDescriptor prop, ListSortDirection direction)
{
Comparison<T> comparison;
if (!_customComparisons.TryGetValue(prop.Name, out comparison))
{
// Check to see if the property type we are sorting by implements
// the IComparable interface.
Type interfaceType = prop.PropertyType.GetInterface("IComparable");
if (interfaceType != null)
{
comparison = delegate(T t1, T t2)
{
IComparable val1 = (IComparable)prop.GetValue(t1);
IComparable val2 = (IComparable)prop.GetValue(t2);
return val1.CompareTo(val2);
};
}
else
{
// Last option: convert to string and compare.
comparison = delegate(T t1, T t2)
{
string val1 = prop.GetValue(t1).ToString();
string val2 = prop.GetValue(t2).ToString();
return val1.CompareTo(val2);
};
}
}
if (comparison != null)
{
// If so, set the SortPropertyValue and SortDirectionValue.
_sortPropertyValue = prop;
_sortDirectionValue = direction;
// Create sorted list.
List<T> _sortedList = new List<T>(this);
_sortedList.Sort(comparison);
// Reverse order if needed.
if (direction == ListSortDirection.Descending)
{
_sortedList.Reverse();
}
// Update list.
int count = this.Count;
for (int i = 0; i < count; i++)
{
this[i] = _sortedList[i];
}
// Raise the ListChanged event so bound controls refresh their
// values.
OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1));
}
}
// Method below was in the original implementation from MS. Don't know what it's for.
// -- Martijn Boeker, Jan 21, 2010
//protected override void RemoveSortCore()
//{
// //int position;
// //object temp;
// //// Ensure the list has been sorted.
// //if (unsortedItems != null)
// //{
// // // Loop through the unsorted items and reorder the
// // // list per the unsorted list.
// // for (int i = 0; i < unsortedItems.Count; )
// // {
// // position = this.Find(SortPropertyCore.Name,
// // unsortedItems[i].GetType().
// // GetProperty(SortPropertyCore.Name).
// // 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
// // // If an item in the unsorted list no longer exists, delete it.
// // unsortedItems.RemoveAt(i);
// // }
// // OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1));
// //}
//}
/// <summary>
/// Ability to search an item.
/// </summary>
protected override bool SupportsSearchingCore
{
get
{
return true;
}
}
/// <summary>
/// Finds an item in the list.
/// </summary>
/// <param name="prop"></param>
/// <param name="key"></param>
/// <returns></returns>
protected override int FindCore(PropertyDescriptor prop, object key)
{
// Implementation not changed from MS example code.
// Get the property info for the specified property.
PropertyInfo propInfo = typeof(T).GetProperty(prop.Name);
T item;
if (key != null)
{
// Loop through the the items to see if the key
// value matches the property value.
for (int i = 0; i < Count; ++i)
{
item = (T)Items[i];
if (propInfo.GetValue(item, null).Equals(key))
return i;
}
}
return -1;
}
/// <summary>
/// Finds an item in the list.
/// </summary>
/// <param name="prop"></param>
/// <param name="key"></param>
/// <returns></returns>
private int Find(string property, object key)
{
// Implementation not changed from MS example code.
// Check the properties for a property with the specified name.
PropertyDescriptorCollection properties =
TypeDescriptor.GetProperties(typeof(T));
PropertyDescriptor prop = properties.Find(property, true);
// If there is not a match, return -1 otherwise pass search to
// FindCore method.
if (prop == null)
return -1;
else
return FindCore(prop, key);
}
#endregion
}
}
//---------------------------------------------------------------------
//版权所有（C）微软公司。版权所有。
//
//本规范和信息按原样提供，不提供任何担保
//明示或暗示的种类，包括但不限于
//对产品适销性和/或适用性的默示保证
//特殊目的。
//---------------------------------------------------------------------
使用制度；
使用System.Collections.Generic；
使用系统组件模型；
使用系统数据；
使用系统图；
使用系统文本；
使用System.Windows.Forms；
运用系统反思；
使用系统集合；
名称空间某物某物
{
///
///支持在数据网格视图中对列表进行排序。
///
///要在数据网格视图中显示的对象类型。
公共类SortableSearchableList:BindingList
{
#区域数据成员
私有ListSortDirection\u sortDirectionValue；
私有属性描述符_sortPropertyValue=null；
///
///从属性名到自定义比较函数的字典。
///
私人词典
//---------------------------------------------------------------------
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//THIS CODE AND INFORMATION ARE PROVIDED AS IS WITHOUT WARRANTY OF ANY
//KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
//IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
//PARTICULAR PURPOSE.
//---------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Reflection;
using System.Collections;
namespace SomethingSomething
{
/// <summary>
/// Supports sorting of list in data grid view.
/// </summary>
/// <typeparam name="T">Type of object to be displayed in data grid view.</typeparam>
public class SortableSearchableList<T> : BindingList<T>
{
#region Data Members
private ListSortDirection _sortDirectionValue;
private PropertyDescriptor _sortPropertyValue = null;
/// <summary>
/// Dictionary from property name to custom comparison function.
/// </summary>
private Dictionary<string, Comparison<T>> _customComparisons = new Dictionary<string, Comparison<T>>();
#endregion
#region Constructors
/// <summary>
/// Default constructor.
/// </summary>
public SortableSearchableList()
{
}
#endregion
#region Properties
/// <summary>
/// Indicates if sorting is supported.
/// </summary>
protected override bool SupportsSortingCore
{
get
{
return true;
}
}
/// <summary>
/// Indicates if list is sorted.
/// </summary>
protected override bool IsSortedCore
{
get
{
return _sortPropertyValue != null;
}
}
/// <summary>
/// Indicates which property the list is sorted.
/// </summary>
protected override PropertyDescriptor SortPropertyCore
{
get
{
return _sortPropertyValue;
}
}
/// <summary>
/// Indicates in which direction the list is sorted on.
/// </summary>
protected override ListSortDirection SortDirectionCore
{
get
{
return _sortDirectionValue;
}
}
#endregion
#region Methods
/// <summary>
/// Add custom compare method for property.
/// </summary>
/// <param name="propertyName"></param>
/// <param name="compareProperty"></param>
protected void AddCustomCompare(string propertyName, Comparison<T> comparison)
{
_customComparisons.Add(propertyName, comparison);
}
/// <summary>
/// Apply sort.
/// </summary>
/// <param name="prop"></param>
/// <param name="direction"></param>
protected override void ApplySortCore(PropertyDescriptor prop, ListSortDirection direction)
{
Comparison<T> comparison;
if (!_customComparisons.TryGetValue(prop.Name, out comparison))
{
// Check to see if the property type we are sorting by implements
// the IComparable interface.
Type interfaceType = prop.PropertyType.GetInterface("IComparable");
if (interfaceType != null)
{
comparison = delegate(T t1, T t2)
{
IComparable val1 = (IComparable)prop.GetValue(t1);
IComparable val2 = (IComparable)prop.GetValue(t2);
return val1.CompareTo(val2);
};
}
else
{
// Last option: convert to string and compare.
comparison = delegate(T t1, T t2)
{
string val1 = prop.GetValue(t1).ToString();
string val2 = prop.GetValue(t2).ToString();
return val1.CompareTo(val2);
};
}
}
if (comparison != null)
{
// If so, set the SortPropertyValue and SortDirectionValue.
_sortPropertyValue = prop;
_sortDirectionValue = direction;
// Create sorted list.
List<T> _sortedList = new List<T>(this);
_sortedList.Sort(comparison);
// Reverse order if needed.
if (direction == ListSortDirection.Descending)
{
_sortedList.Reverse();
}
// Update list.
int count = this.Count;
for (int i = 0; i < count; i++)
{
this[i] = _sortedList[i];
}
// Raise the ListChanged event so bound controls refresh their
// values.
OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1));
}
}
// Method below was in the original implementation from MS. Don't know what it's for.
// -- Martijn Boeker, Jan 21, 2010
//protected override void RemoveSortCore()
//{
// //int position;
// //object temp;
// //// Ensure the list has been sorted.
// //if (unsortedItems != null)
// //{
// // // Loop through the unsorted items and reorder the
// // // list per the unsorted list.
// // for (int i = 0; i < unsortedItems.Count; )
// // {
// // position = this.Find(SortPropertyCore.Name,
// // unsortedItems[i].GetType().
// // GetProperty(SortPropertyCore.Name).
// // 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
// // // If an item in the unsorted list no longer exists, delete it.
// // unsortedItems.RemoveAt(i);
// // }
// // OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1));
// //}
//}
/// <summary>
/// Ability to search an item.
/// </summary>
protected override bool SupportsSearchingCore
{
get
{
return true;
}
}
/// <summary>
/// Finds an item in the list.
/// </summary>
/// <param name="prop"></param>
/// <param name="key"></param>
/// <returns></returns>
protected override int FindCore(PropertyDescriptor prop, object key)
{
// Implementation not changed from MS example code.
// Get the property info for the specified property.
PropertyInfo propInfo = typeof(T).GetProperty(prop.Name);
T item;
if (key != null)
{
// Loop through the the items to see if the key
// value matches the property value.
for (int i = 0; i < Count; ++i)
{
item = (T)Items[i];
if (propInfo.GetValue(item, null).Equals(key))
return i;
}
}
return -1;
}
/// <summary>
/// Finds an item in the list.
/// </summary>
/// <param name="prop"></param>
/// <param name="key"></param>
/// <returns></returns>
private int Find(string property, object key)
{
// Implementation not changed from MS example code.
// Check the properties for a property with the specified name.
PropertyDescriptorCollection properties =
TypeDescriptor.GetProperties(typeof(T));
PropertyDescriptor prop = properties.Find(property, true);
// If there is not a match, return -1 otherwise pass search to
// FindCore method.
if (prop == null)
return -1;
else
return FindCore(prop, key);
}
#endregion
}
}
if (!_customComparisons.TryGetValue(prop.Name, out comparison))
{
// Check to see if the property type we are sorting by implements
// the IComparable interface.
Type interfaceType = prop.PropertyType.GetInterface("IComparable");
if (interfaceType != null)
{
comparison = delegate(T t1, T t2)
{
IComparable val1 = (IComparable)prop.GetValue(t1) ?? "";
IComparable val2 = (IComparable)prop.GetValue(t2) ?? "";
return val1.CompareTo(val2);
};
}
else
{
// Last option: convert to string and compare.
comparison = delegate(T t1, T t2)
{
string val1 = (prop.GetValue(t1) ?? "").ToString();
string val2 = (prop.GetValue(t2) ?? "").ToString();
return val1.CompareTo(val2);
};
}
}
jobs = new List<DisplayJob>();
jobs = new SortableBindingList<DisplayJob>();
itemsList.Sort(delegate(T t1, T t2)
{
object value1 = prop.GetValue(t1);
object value2 = prop.GetValue(t2);
return reverse * Comparer.Default.Compare(value1, value2);
});
int j;
T index;
for (int i = 0; i < itemsList.Count; i++)
{
index = itemsList[i];
j = i;
while ((j > 0) && (reverse * Comparer.Default.Compare(prop.GetValue(itemsList[j - 1]), prop.GetValue(index)) > 0))
{
itemsList[j] = itemsList[j - 1];
j = j - 1;
}
itemsList[j] = index;
}