RealTimeSource 組件旨在顯示少量快速變化的數(shù)據(jù)，同時(shí)保持用戶(hù)界面響應(yīng)。

DevExpress WPF v21.2高速下載

注意：RealTimeSource可以有效地處理不超過(guò)數(shù)百條數(shù)據(jù)記錄的數(shù)據(jù)源。

下圖演示了使用RealTimeSource綁定到動(dòng)態(tài)數(shù)據(jù)的GridControl。

如果您的數(shù)據(jù)源中的記錄經(jīng)常更新（例如，每秒 20 000 次更新），可以考慮使用 組件。

將RealTimeSource與靜態(tài)數(shù)據(jù)一起使用不會(huì)導(dǎo)致任何性能改進(jìn)。

注意：RealTimeSource是數(shù)據(jù)感知控件和實(shí)際數(shù)據(jù)之間的一層。

在決定在應(yīng)用程序中使用 RealTimeSource 組件之前，請(qǐng)考慮以下限制。

• RealTimeSource 可以有效地處理不超過(guò)數(shù)百條數(shù)據(jù)記錄的數(shù)據(jù)源。
• 當(dāng) GridControl 使用 RealTimeSource 綁定到數(shù)據(jù)時(shí)，不支持就地編輯（以及通過(guò)內(nèi)置編輯表單進(jìn)行編輯）。
• RealTimeSource 不跟蹤數(shù)據(jù)更改，要顯示數(shù)據(jù)更新，請(qǐng)確保您的數(shù)據(jù)源提供更改通知。

支持以下通知類(lèi)型。

初始化實(shí)時(shí)源

您可以將任何數(shù)據(jù)感知控件綁定到 RealTimeSource，以GridControl為例。

要在 GridControl 中顯示實(shí)時(shí)數(shù)據(jù)，請(qǐng)執(zhí)行以下操作。

• 在代碼中，創(chuàng)建一個(gè) RealTimeSource 對(duì)象，使用其 屬性將實(shí)時(shí)源鏈接到您的數(shù)據(jù)。
• 將 屬性（通過(guò) GridControl.ItemsSource）設(shè)置為您的 對(duì)象。

C#

ObservableCollection<Data> Persons;
//...
DevExpress.Data.RealTimeSource myRealTimeSource = new DevExpress.Data.RealTimeSource();
myRealTimeSource.DataSource = Persons;
myGridControl.ItemsSource = myRealTimeSource;

下面描述了其他RealTimeSource配置方案。

場(chǎng)景：指定哪些數(shù)據(jù)源屬性被傳遞給數(shù)據(jù)感知控件。

方法：使用屬性指定所需的數(shù)據(jù)源屬性。

C#

//A semicolon-separated list of data source property names
myRealTimeSource.DisplayableProperties = "Id;Progress";

場(chǎng)景：忽略對(duì)單個(gè)屬性值的修改。

方法：將屬性設(shè)置為 true。將忽略對(duì)數(shù)據(jù)源項(xiàng)的修改，只有對(duì)數(shù)據(jù)源列表所做的修改才會(huì)傳遞給數(shù)據(jù)感知控件。

示例

此示例演示如何使用 RealTimeSource 組件在 GridControl 中顯示快速變化的數(shù)據(jù)。

注意：此示例中的數(shù)據(jù)是出于演示目的隨機(jī)生成的。

MainWindow.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Collections.ObjectModel;
using System.Globalization;
using System.Windows.Data;
using System.Windows.Markup;
using DevExpress.Data;
using System.Windows.Threading;
using System.ComponentModel;

namespace RealTimeSourceExample {
public partial class MainWindow: Window {
ObservableCollection<Data> Persons;
int Count = 50;
Random Random = new Random();
public MainWindow() {
InitializeComponent();
Persons = new ObservableCollection<Data>();
for (int i = 0; i < Count; i++)
Persons.Add(new Data {
Id = i,
Text = "Text" + i,
Progress = GetNumber()
});

grid.ItemsSource = new RealTimeSource() {
DataSource = Persons
};

DispatcherTimer timer = new DispatcherTimer();
timer.Interval = TimeSpan.FromMilliseconds(1);
timer.Tick += Tick;
timer.Start();
}

private void Tick(object sender, EventArgs e) {
int index = Random.Next(0, Count);
Persons[index].Id = GetNumber();
Persons[index].Text = "Text" + GetNumber();
Persons[index].Progress = GetNumber();
}
int GetNumber() {
return Random.Next(0, Count);
}
}
public class Data: INotifyPropertyChanged {
private int _Id;
public string _Text;
public double _Progress;

public int Id {
get {
return _Id;
}
set {
_Id = value;
NotifyPropertyChanged("Id");
}
}
public string Text {
get {
return _Text;
}
set {
_Text = value;
NotifyPropertyChanged("Text");
}
}
public double Progress {
get {
return _Progress;
}
set {
_Progress = value;
NotifyPropertyChanged("Progress");
}
}

public event PropertyChangedEventHandler PropertyChanged;
void NotifyPropertyChanged(string name) {
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(name));
}
}
}

MainWindow.xaml.vb

Imports Microsoft.VisualBasic
Imports System
Imports System.Collections.Generic
Imports System.Linq
Imports System.Windows
Imports System.Collections.ObjectModel
Imports System.Globalization
Imports System.Windows.Data
Imports System.Windows.Markup
Imports DevExpress.Data
Imports System.Windows.Threading
Imports System.ComponentModel

Namespace RealTimeSourceExample
Partial Public Class MainWindow
Inherits Window
Private Persons As ObservableCollection(Of Data)
Private Count As Integer = 50
Private Random As New Random()
Public Sub New()
InitializeComponent()
Persons = New ObservableCollection(Of Data)()
For i As Integer = 0 To Count - 1
Persons.Add(New Data With {.Id = i, .Text = "Text" & i, .Progress = GetNumber()})
Next i

grid.ItemsSource = New RealTimeSource() With {.DataSource = Persons}

Dim timer As New DispatcherTimer()
timer.Interval = TimeSpan.FromMilliseconds(1)
AddHandler timer.Tick, AddressOf Tick
timer.Start()
End Sub

Private Sub Tick(ByVal sender As Object, ByVal e As EventArgs)
Dim index As Integer = Random.Next(0, Count)
Persons(index).Id = GetNumber()
Persons(index).Text = "Text" & GetNumber()
Persons(index).Progress = GetNumber()
End Sub
Private Function GetNumber() As Integer
Return Random.Next(0, Count)
End Function
End Class
Public Class Data
Implements INotifyPropertyChanged
Private _Id As Integer
Public _Text As String
Public _Progress As Double

Public Property Id() As Integer
Get
Return _Id
End Get
Set(ByVal value As Integer)
_Id = value
NotifyPropertyChanged("Id")
End Set
End Property
Public Property Text() As String
Get
Return _Text
End Get
Set(ByVal value As String)
_Text = value
NotifyPropertyChanged("Text")
End Set
End Property
Public Property Progress() As Double
Get
Return _Progress
End Get
Set(ByVal value As Double)
_Progress = value
NotifyPropertyChanged("Progress")
End Set
End Property

Public Event PropertyChanged As PropertyChangedEventHandler Implements INotifyPropertyChanged.PropertyChanged
Private Sub NotifyPropertyChanged(ByVal name As String)
RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(name))
End Sub
End Class
End Namespace

MainWindow.xaml

<Window
x:Class="RealTimeSourceExample.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:dxg="http://schemas.devexpress.com/winfx/2008/xaml/grid"
xmlns:dxe="http://schemas.devexpress.com/winfx/2008/xaml/editors"
xmlns:dx="http://schemas.devexpress.com/winfx/2008/xaml/core"
xmlns:local="clr-namespace:RealTimeSourceExample"
Name="win"
Title="MainWindow"
Height="350"
Width="525">
<Grid>
<dxg:GridControl x:Name="grid">
<dxg:GridControl.Columns>
<dxg:GridColumn FieldName="Id"/>
<dxg:GridColumn FieldName="Text"/>
<dxg:GridColumn FieldName="Progress">
<dxg:GridColumn.EditSettings>
<dxe:ProgressBarEditSettings/>
</dxg:GridColumn.EditSettings>
</dxg:GridColumn>
</dxg:GridControl.Columns>
<dxg:GridControl.View>
<dxg:TableView Name="view" AutoWidth="True"/>
</dxg:GridControl.View>
</dxg:GridControl>
</Grid>
</Window>

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