界面控件DevExpress WPF入门级教程：数据源

界面控件DevExpress WPF入门级教程：数据源 - 实时源

翻译|使用教程|编辑：龚雪|2022-02-14 10:14:47.417|阅读 310 次

概述：本文主要介绍DevExpress WPF数据源中的实时源类型，欢迎下载最新版体验！

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初始化实时源

您可以将任何数据感知控件绑定到 RealTimeSource，以GridControl为例。

要在 GridControl 中显示实时数据，请执行以下操作。

在代码中，创建一个 RealTimeSource 对象，使用其属性将实时源链接到您的数据。
将属性（通过 GridControl.ItemsSource）设置为您的对象。

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。

场景：指定哪些数据源属性被传递给数据感知控件。

方法：使用属性指定所需的数据源属性。

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

场景：忽略对单个属性值的修改。

方法：将属性设置为 true。将忽略对数据源项的修改，只有对数据源列表所做的修改才会传递给数据感知控件。

示例

此示例演示如何使用 RealTimeSource 组件在 GridControl 中显示快速变化的数据。

注意：此示例中的数据是出于演示目的随机生成的。

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="//schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="//schemas.microsoft.com/winfx/2006/xaml"
xmlns:dxg="//schemas.devexpress.com/winfx/2008/xaml/grid"
xmlns:dxe="//schemas.devexpress.com/winfx/2008/xaml/editors"
xmlns:dx="//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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