[英]How can I bind a Queue to a DataGridView in C#/Winforms?
I have a standard C# queue, declared like this: 我有一个标准的C#队列,声明如下:
private Queue<DeployJob> _solutionQueue = new Queue<DeployJob>();
Now I want to bind this queue to an DataGridView, which is placed inside a winform. 现在我想将这个队列绑定到一个DataGridView,它放在一个winform中。 With "bind" i mean that everytime i
dequeue
or enqueue
an item from the queue the DataGridView
gets updated (so that it always represents the state of the queue). 使用“绑定”,我的意思是每当我从队列中
dequeue
或enqueue
一个项目时, DataGridView
就会被更新(这样它总是代表队列的状态)。
I have tried to bind it this way: 我试图用这种方式绑定它:
jobGridView.DataSource = _solutionQueue;
But it doesnt work, even if I use the update
or refresh
methods. 但它不起作用,即使我使用
update
或refresh
方法。 If you need more code, please feel free to ask :) 如果您需要更多代码,请随时问:)
According to MSDN , the DataGridView.DataSource
must implement one of the following interfaces: 根据MSDN ,
DataGridView.DataSource
必须实现以下接口之一:
IList
IListSource
IBindingList
IBindingListView
The Queue<T>
class implements parent interfaces of IList
, including IEnumerable
and ICollection
, but not IList
itself. Queue<T>
类实现IList
父接口,包括IEnumerable
和ICollection
,但不是IList
本身。
One suggestion is to use LINQ to create a List<DeployJob>
from the queue and bind like so: 一个建议是使用LINQ从队列创建
List<DeployJob>
并像这样绑定:
using System.Linq;
//code
jobGridView.DataSource = _solutionQueue.ToList();
You would want to make sure and handle any events that update/modify the queue, and re-bind the DataGridView to a newly created List 您可能希望确保并处理更新/修改队列的任何事件,并将DataGridView重新绑定到新创建的List
I created a generic queue type that makes a queue observable and a derived type that makes this new queue behave like a list and a binding list. 我创建了一个通用队列类型,它使队列可观察,并且派生类型使这个新队列的行为类似于列表和绑定列表。 This works for read only features of a datagridview.
这适用于datagridview的只读功能。 You would need to extend further if you need additional functionality.
如果您需要其他功能,则需要进一步扩展。
Observable concurrent queue: 可观察的并发队列:
Imports System.Collections.Concurrent
Imports System.Collections.Specialized
Public Class ObservableConcurrentQueue(Of T)
Inherits ConcurrentQueue(Of T)
Implements INotifyCollectionChanged
Public Event CollectionChanged(sender As Object, e As NotifyCollectionChangedEventArgs) Implements INotifyCollectionChanged.CollectionChanged
Private Sub OnCollectionChanged(ByVal args As NotifyCollectionChangedEventArgs)
RaiseEvent CollectionChanged(Me, args)
End Sub
Public Shadows Sub Enqueue(ByVal item As T)
MyBase.Enqueue(item)
OnCollectionChanged(New NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, item))
End Sub
Public Shadows Function TryDequeue(ByRef result As T) As Boolean
If Not MyBase.TryDequeue(result) Then
Return False
End If
OnCollectionChanged(New NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Remove, result))
Return True
End Function
End Class
Wrap it further to behave like a list and abindinglist: 进一步包装,表现得像列表和abindinglist:
Imports System.Linq
Imports System.ComponentModel
Imports System.Collections.Specialized
Imports System.Linq.Expressions
Public Class ObservableConcurrentQueueList(Of T)
Inherits ObservableConcurrentQueue(Of T)
Implements IList(Of T), IBindingList
Public Sub Clear()
Dim item As T
While (Not IsEmpty())
MyBase.TryDequeue(item)
End While
End Sub
#Region "IList Implementation"
Public Sub Add1(item As T) Implements ICollection(Of T).Add
MyBase.Enqueue(item)
End Sub
Protected Sub Clear1() Implements ICollection(Of T).Clear
Clear()
End Sub
Protected Function Contains1(item As T) As Boolean Implements ICollection(Of T).Contains
Return MyBase.Contains(item)
End Function
Protected Sub CopyTo1(array() As T, arrayIndex As Integer) Implements ICollection(Of T).CopyTo
MyBase.CopyTo(array, arrayIndex)
End Sub
Protected ReadOnly Property Count1 As Integer Implements ICollection(Of T).Count
Get
Return MyBase.Count
End Get
End Property
Protected ReadOnly Property IsReadOnly1 As Boolean Implements ICollection(Of T).IsReadOnly
Get
Return True
End Get
End Property
Protected Function Remove1(item As T) As Boolean Implements ICollection(Of T).Remove
Throw New NotImplementedException
End Function
Protected Function IndexOf1(item As T) As Integer Implements IList(Of T).IndexOf
Return Me.ToList.IndexOf(item)
End Function
Protected Sub Insert1(index As Integer, item As T) Implements IList(Of T).Insert
Throw New NotImplementedException
End Sub
Protected Property Item1(index As Integer) As T Implements IList(Of T).Item
Get
Return Me.ToList.Item(index)
End Get
Set(value As T)
Throw New NotImplementedException
End Set
End Property
Protected Sub RemoveAt1(index As Integer) Implements IList(Of T).RemoveAt
Throw New NotImplementedException
End Sub
#End Region
#Region "IBindList Implementation"
Protected Function Add2(value As Object) As Integer Implements IList.Add
'Throw New NotImplementedException
MyBase.Enqueue(value)
Return Nothing
End Function
Protected Sub Clear2() Implements IList.Clear
Clear()
End Sub
Protected Function Contains2(value As Object) As Boolean Implements IList.Contains
Return MyBase.Contains(value)
End Function
Protected Function IndexOf2(value As Object) As Integer Implements IList.IndexOf
Return Me.ToList.IndexOf(value)
End Function
Protected Sub Insert2(index As Integer, value As Object) Implements IList.Insert
Throw New NotImplementedException
End Sub
Protected ReadOnly Property IsFixedSize2 As Boolean Implements IList.IsFixedSize
Get
Return False
End Get
End Property
Protected ReadOnly Property IsReadOnly2 As Boolean Implements IList.IsReadOnly
Get
Return True
End Get
End Property
Protected Overloads Property Item2(index As Integer) As Object Implements IList.Item
Get
Return Me.ToList.Item(index)
End Get
Set(value As Object)
Throw New NotImplementedException
End Set
End Property
Protected Sub Remove2(value As Object) Implements IList.Remove
Throw New NotImplementedException
End Sub
Protected Sub RemoveAt2(index As Integer) Implements IList.RemoveAt
Throw New NotImplementedException
End Sub
Protected Sub AddIndex2([property] As PropertyDescriptor) Implements IBindingList.AddIndex
End Sub
Protected Function AddNew2() As Object Implements IBindingList.AddNew
Throw New NotImplementedException
End Function
Protected ReadOnly Property AllowEdit2 As Boolean Implements IBindingList.AllowEdit
Get
Return False
End Get
End Property
Protected ReadOnly Property AllowNew2 As Boolean Implements IBindingList.AllowNew
Get
Return False
End Get
End Property
Protected ReadOnly Property AllowRemove2 As Boolean Implements IBindingList.AllowRemove
Get
Return False
End Get
End Property
Protected Sub ApplySort2([property] As PropertyDescriptor, direction As ListSortDirection) Implements IBindingList.ApplySort
Throw New NotImplementedException
End Sub
Protected Function Find2([property] As PropertyDescriptor, key As Object) As Integer Implements IBindingList.Find
Throw New NotImplementedException
Return Nothing
End Function
Protected ReadOnly Property IsSorted2 As Boolean Implements IBindingList.IsSorted
Get
Return False
End Get
End Property
Protected Event ListChanged2(sender As Object, e As ListChangedEventArgs) Implements IBindingList.ListChanged
Protected Sub RemoveIndex2([property] As PropertyDescriptor) Implements IBindingList.RemoveIndex
Throw New NotImplementedException
End Sub
Protected Sub RemoveSort2() Implements IBindingList.RemoveSort
'Throw New NotImplementedException
End Sub
Protected ReadOnly Property SortDirection2 As ListSortDirection Implements IBindingList.SortDirection
Get
'Throw New NotImplementedException
End Get
End Property
Protected ReadOnly Property SortProperty2 As PropertyDescriptor Implements IBindingList.SortProperty
Get
Throw New NotImplementedException
Return Nothing
End Get
End Property
Protected ReadOnly Property SupportsChangeNotification2 As Boolean Implements IBindingList.SupportsChangeNotification
Get
Return True
End Get
End Property
Protected ReadOnly Property SupportsSearching2 As Boolean Implements IBindingList.SupportsSearching
Get
Return False
End Get
End Property
Protected ReadOnly Property SupportsSorting2 As Boolean Implements IBindingList.SupportsSorting
Get
Return False
End Get
End Property
#End Region
End Class
Use it in a form: 在表格中使用它:
Private Sub Form_Load(sender As Object, e As EventArgs) Handles MyBase.Load
DataGridView1.AutoGenerateColumns = True
Me.DataGridView1.DataSource = MyObservableQueueList
AddHandler MyObservableQueueList.CollectionChanged, AddressOf UpdateGrid
End Sub
Private Sub UpdateGrid(sender As Object, e As System.Collections.Specialized.NotifyCollectionChangedEventArgs)
Me.MyObservableQueueList.DataSource = Nothing
Me.MyObservableQueueList.DataSource = _AlarmHistory
End Sub
Protected Overrides Sub Dispose(ByVal disposing As Boolean)
Try
RemoveHandler MyObservableQueueList.CollectionChanged, AddressOf UpdateGrid
If disposing AndAlso components IsNot Nothing Then
components.Dispose()
End If
Finally
MyBase.Dispose(disposing)
End Try
End Sub
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