wpf之数据触发器DataTrigger

wpf, 根据绑定的属性的值的不同(数据分类)，界面上显示不同的控件(绑定不同类型的属性),可以使用数据库触发器DataTrigger实现这一功能。

实现的效果如下：

 

首先建立实体类：

更改通知类：

public class NotifyPropertyChangedObject : INotifyPropertyChanged
    {
        /// <summary>
        /// 属性更改事件
        /// </summary>
        public event PropertyChangedEventHandler PropertyChanged;

        /// <summary>
        /// 触发属性更改事件
        /// </summary>
        /// <param name="propertyName">属性名称</param>
        protected virtual void OnPropertyChanged(string propertyName)
        {
            PropertyChangedEventHandler propertyChanged = this.PropertyChanged;

            if (propertyChanged != null)
            {
                propertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }
    }

检查定义类：

public class CheckDefine:NotifyPropertyChangedObject
    {
        #region Model
        private Guid _checkDefineId;
        private int _seqno;
        private string _checkitem;
        private int _checktype;

        /// <summary>
        /// 主键id
        /// </summary>
        public Guid CheckDefineId
        {
            set
            {
                _checkDefineId = value;
                OnPropertyChanged("CheckDefineId");
            }
            get { return _checkDefineId; }
        }
      
        /// <summary>
        /// 编号
        /// </summary>
        public int SeqNo
        {
            set
            {
                _seqno = value;
                OnPropertyChanged("SeqNo");
            }
            get { return _seqno; }
        }
        /// <summary>
        /// 检查项
        /// </summary>
        public string CheckItem
        {
            set
            {
                _checkitem = value;
                OnPropertyChanged("CheckItem");
            }
            get { return _checkitem; }
        }
        /// <summary>
        /// 1:bool ;2:text;3:Numeric
        /// </summary>
        public int CheckType
        {
            set
            {
                _checktype = value;
                OnPropertyChanged("CheckType");
            }
            get { return _checktype; }
        }
        
        #endregion Model
    }

检查记录类：

  public class CheckRecord : NotifyPropertyChangedObject
    {
        #region Model
        private CheckDefine _checkCheckDefine;
        private Guid _checkid;
        private bool? _resultbool;
        private string _resulttext;
        private decimal? _resultnumeric;
        private Guid _userid1;
        private Guid _userid2;
        private DateTime? _operatingdt;

        /// <summary>
        /// 生产前的检查(定义)
        /// </summary>
        public CheckDefine CheckDefine
        {
            set
            {
                _checkCheckDefine = value;
                OnPropertyChanged("CheckDefine");
            }
            get { return _checkCheckDefine; }
        }

        /// <summary>
        /// 主键id
        /// </summary>
        public Guid CheckId
        {
            set
            {
                _checkid = value;
                OnPropertyChanged("CheckBeforeProductionRecordid");
            }
            get { return _checkid; }
        }

        /// <summary>
        /// 勾选框
        /// </summary>
        public bool? ResultBool
        {
            set
            {
                _resultbool = value;
                OnPropertyChanged("ResultBool");
            }
            get { return _resultbool; }
        }
        /// <summary>
        /// 文本输入框
        /// </summary>
        public string ResultText
        {
            set
            {
                _resulttext = value;
                OnPropertyChanged("ResultText");
            }
            get { return _resulttext; }
        }
        /// <summary>
        /// 数字类型(输入框)
        /// </summary>
        public decimal? ResultNumeric
        {
            set
            {
                _resultnumeric = value;
                OnPropertyChanged("ResultNumeric");
            }
            get { return _resultnumeric; }
        }
        /// <summary>
        /// 操作人
        /// </summary>
        public Guid Userid1
        {
            set
            {
                _userid1 = value;
                OnPropertyChanged("Userid1");
            }
            get { return _userid1; }
        }
        /// <summary>
        /// 复核人
        /// </summary>
        public Guid Userid2
        {
            set
            {
                _userid2 = value;
                OnPropertyChanged("Userid2");
            }
            get { return _userid2; }
        }
        /// <summary>
        /// 检查时间
        /// </summary>
        public DateTime? Operatingdt
        {
            set
            {
                _operatingdt = value;
                OnPropertyChanged("Operatingdt");
            }
            get { return _operatingdt; }
        }
        #endregion Model
    }

xaml:

<Window x:Class="DataTriggerDemo.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow"  x:Name="mainWindow">
    <Grid>
        <ListView  ItemsSource="{Binding Path=CheckRecords, ElementName=mainWindow}">
            <ListView.View>
                <GridView>
                    <GridViewColumn Header="操作指令">
                        <GridViewColumn.CellTemplate>
                            <DataTemplate>
                                <TextBlock Margin="5" Text="{Binding Path=CheckDefine.CheckItem}" FontSize="16"/>
                            </DataTemplate>
                        </GridViewColumn.CellTemplate>
                    </GridViewColumn>
                    <GridViewColumn Header="操作记录">
                        <GridViewColumn.CellTemplate>
                        <DataTemplate>
                            <Grid>
                                    <TextBox x:Name="txtNum"  Text="{Binding Path=ResultNumeric}" TextWrapping="Wrap"  Visibility="Collapsed"/>
                                <TextBox x:Name="txtText"  Text="{Binding Path=ResultText}" TextWrapping="Wrap" Visibility="Collapsed"/>
                                <CheckBox x:Name="txtBool" IsChecked="{Binding Path=ResultBool}"  Visibility="Collapsed"/>
                            </Grid>
                            <DataTemplate.Triggers>
                                    <DataTrigger Binding="{Binding Path=CheckDefine.CheckType}" Value="1">
                                    <Setter TargetName="txtBool" Property="Visibility" Value="Visible" />
                                </DataTrigger>
                                    <DataTrigger Binding="{Binding Path=CheckDefine.CheckType}" Value="2">
                                    <Setter TargetName="txtText" Property="Visibility" Value="Visible" />
                                </DataTrigger>
                                    <DataTrigger Binding="{Binding Path=CheckDefine.CheckType}" Value="3">
                                    <Setter TargetName="txtNum" Property="Visibility" Value="Visible" />
                                </DataTrigger>
                            </DataTemplate.Triggers>
                        </DataTemplate>
                            </GridViewColumn.CellTemplate>
                            </GridViewColumn>
                </GridView>
            </ListView.View>
        </ListView>
    </Grid>
</Window>

注：

    从xaml中可知：ListView的ItemsSource绑定了CheckRecords集合，

ListView的第二列的CellTemplate里是一Grid里有两个TextBox和一个CheckBox控件，

三个控件分别绑定到了CheckRecord类的三个不同类型的属性，且三个控件都默认是不可见的。

在DataTemplate.Triggers中绑定了三个DataTrigger，且都绑定到了CheckDefine.CheckType这个属性，

从而根据CheckDefine.CheckType的值来决定三个控件中哪个控件可见(Visibility="Visible")

C#代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Collections.ObjectModel;
using DataTriggerDemo.Models;

namespace DataTriggerDemo
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        private ObservableCollection<CheckRecord> checkRecords;
        /// <summary>
        /// 生产前的检查记录集合
        /// </summary>
        public ObservableCollection<CheckRecord> CheckRecords
        {
            get
            {
                if (checkRecords == null)
                {
                    checkRecords = new ObservableCollection<CheckRecord>();
                }
                return checkRecords;
            }
        }
        public MainWindow()
        {
            InitializeComponent();
            GetData();
        }

        private void GetData()
        {
            CheckRecord c1 = new CheckRecord
            {
                CheckId=Guid.NewGuid(),
                CheckDefine = new CheckDefine
                {
                    CheckDefineId=Guid.NewGuid(),
                    SeqNo=1,
                    CheckItem = "操作间已清场合格，并在有效期内。",
                    CheckType=1
                }

            };
            CheckRecords.Add(c1);

            CheckRecord c2 = new CheckRecord
            {
                CheckId = Guid.NewGuid(),
                CheckDefine = new CheckDefine
                {
                    CheckDefineId = Guid.NewGuid(),
                    SeqNo = 2,
                    CheckItem = "操作间已清洁,并无上次生产遗留物;无与本次生产无关文件。",
                    CheckType = 1
                }

            };
            CheckRecords.Add(c2);

            CheckRecord c3 = new CheckRecord
            {
                CheckId = Guid.NewGuid(),
                CheckDefine = new CheckDefine
                {
                    CheckDefineId = Guid.NewGuid(),
                    SeqNo = 3,
                    CheckItem = "所用设备、容器具已清洁消毒，且无上批次生产遗留物；已更换干净的抹布。",
                    CheckType = 1
                }

            };
            CheckRecords.Add(c3);

            CheckRecord c4 = new CheckRecord
            {
                CheckId = Guid.NewGuid(),
                CheckDefine = new CheckDefine
                {
                    CheckDefineId = Guid.NewGuid(),
                    SeqNo = 4,
                    CheckItem = "所用的计量器具符合要求，在检验有效期内。",
                    CheckType = 1
                }

            };
            CheckRecords.Add(c4);

            CheckRecord c5= new CheckRecord
            {
                CheckId = Guid.NewGuid(),
                CheckDefine = new CheckDefine
                {
                    CheckDefineId = Guid.NewGuid(),
                    SeqNo = 5,
                    CheckItem = "所用物料合格且标签相关信息与指令要求相一致：使用的文件与记录已备案。",
                    CheckType = 1
                }

            };
            CheckRecords.Add(c5);

            CheckRecord c6 = new CheckRecord
            {
                CheckId = Guid.NewGuid(),
                CheckDefine = new CheckDefine
                {
                    CheckDefineId = Guid.NewGuid(),
                    SeqNo =6,
                    CheckItem = "操作间环境符合要求(温度18~26°C,湿度45~65%)。",
                    CheckType =2
                }

            };
            CheckRecords.Add(c6);

            CheckRecord c7= new CheckRecord
            {
                CheckId = Guid.NewGuid(),
                CheckDefine = new CheckDefine
                {
                    CheckDefineId = Guid.NewGuid(),
                    SeqNo = 7,
                    CheckItem = "所用设备完好，试运转正常；设备操作人员均持证上岗。",
                    CheckType =3
                }

            };
            CheckRecords.Add(c7);
        }
    }
}

运行效果：