WPF实战项目十八（客户端）：添加新增、查询、编辑功能-编程知识

1、ToDoView.xmal添加引用，添加微软的行为类

 xmlns:i="http://schemas.microsoft.com/xaml/behaviors"

2、给项目添加行为

<i:Interaction.Triggers><i:EventTrigger EventName="MouseLeftButtonUp"><i:InvokeCommandAction Command="{Binding DataContext.SelectedCommand, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=ItemsControl}}" CommandParameter="{Binding}" /></i:EventTrigger></i:Interaction.Triggers>

3、ToDoViewModel.cs新建查询SelectedCommand

public DelegateCommand<ToDoDto> SelectedCommand { get;private set; }public ToDoViewModel(IToDoService toDoService, IContainerProvider provider) : base(provider){ToDoDtos = new ObservableCollection<ToDoDto>();AddCommand = new DelegateCommand(Add);SelectedCommand = new DelegateCommand<ToDoDto>(Selected);this.toDoService = toDoService;}

private async void Selected(ToDoDto obj){try{UpdateLoading(true);var todoResult = await toDoService.GetFirstOfDefaultAsync(obj.Id);if (todoResult.Status){IsIsRightDrawerOpens = true;CurrentDto = todoResult.Result;}}catch (Exception){throw;}finally{UpdateLoading(false);}}

4、新建属性编辑选中/新增时的对象

private ToDoDto currentDto;/// <summary>/// 编辑选中/新增时的对象/// </summary>public ToDoDto CurrentDto{get { return currentDto; }set { currentDto = value; RaisePropertyChanged(); }}

5、前台绑定文本标题、内容、状态

                    <StackPanelMargin="20"DockPanel.Dock="Top"Orientation="Horizontal"><TextBlock VerticalAlignment="Center" Text="状态：" /><ComboBox SelectedIndex="{Binding CurrentDto.Status}"><ComboBoxItem>待办</ComboBoxItem><ComboBoxItem>已完成</ComboBoxItem></ComboBox></StackPanel><TextBoxMargin="20,5"md:HintAssist.Hint="请输入待办概要"DockPanel.Dock="Top"Text="{Binding CurrentDto.Title}" /><TextBoxMinHeight="100"Margin="20,10"md:HintAssist.Hint="请输入待办事项内容"DockPanel.Dock="Top"Text="{Binding CurrentDto.Content}" />

6、F5运行项目，点击待办事项能在右侧显示信息

7、绑定搜索输入框，首先定义一个属性，前台绑定输入框的值Search，给输入框添加回车事件

        private string search;/// <summary>/// 搜索条件/// </summary>public string Search{get { return search; }set { search = value; RaisePropertyChanged(); }}

<TextBoxWidth="250"md:HintAssist.Hint="查找待办事项..."md:TextFieldAssist.HasClearButton="True"Text="{Binding Search, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"><TextBox.InputBindings><KeyBinding Key="Enter" Command="{Binding SearchCommand}" /></TextBox.InputBindings></TextBox>

8、SearchCommand搜索事件可以和上面AddCommand合并到一起，【添加待办】按钮设置事件：ExecuteCommand，参数设置="新增"，查找框设置成ExecuteCommand，参数设置="查询"

public DelegateCommand<string> ExecuteCommand { get; private set; }public ToDoViewModel(IToDoService toDoService, IContainerProvider provider) : base(provider){ToDoDtos = new ObservableCollection<ToDoDto>();ExecuteCommand = new DelegateCommand<string>(Execute);SelectedCommand = new DelegateCommand<ToDoDto>(Selected);this.toDoService = toDoService;}

                <ButtonMargin="10,0"HorizontalAlignment="Right"Command="{Binding ExecuteCommand}"CommandParameter="新增"Content="+ 添加待办" />

<TextBoxWidth="250"md:HintAssist.Hint="查找待办事项..."md:TextFieldAssist.HasClearButton="True"Text="{Binding Search, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"><TextBox.InputBindings><KeyBindingKey="Enter"Command="{Binding ExecuteCommand}"CommandParameter="查询" /></TextBox.InputBindings></TextBox>

9、获取数据的函数里面把Search属性传进去

/// <summary>/// 获取数据/// </summary>private async void GetDataAsync(){UpdateLoading(true);var todoResult = await toDoService.GetAllPageListAsync(new WPFProjectShared.Parameters.QueryParameter{PageIndex = 0,PageSize = 100,Search = Search});if (todoResult.Status){toDoDtos.Clear();foreach (var item in todoResult.Result.Items){toDoDtos.Add(item);}}UpdateLoading(false);}

10、新增Excute方法和Query方法

private void Execute(string obj){switch (obj){case "新增":Add();break;case "查询":Query();break;}}private void Query(){GetDataAsync();}

11、F5运行项目，在搜索框里面查询显示12、【保存】事件，按钮添加绑定事件，修改Excute方法、新增Add方法和Save方法

                    <ButtonMargin="20,0"Command="{Binding ExecuteCommand}"CommandParameter="保存"Content="添加到待办"DockPanel.Dock="Top" />

        private void Execute(string obj){switch (obj){case "新增":Add();break;case "查询":Query();break;case "保存":Save();break;}}/// <summary>/// 添加待办/// </summary>/// <exception cref="NotImplementedException"></exception>private void Add(){CurrentDto = new ToDoDto();IsIsRightDrawerOpens = true;}
private async void Save(){if (string.IsNullOrWhiteSpace(CurrentDto.Title) || string.IsNullOrWhiteSpace(CurrentDto.Content)){return;}else{UpdateLoading(true);try{if (CurrentDto.Id > 0)//update{var updateResult = await toDoService.UpdateAsync(CurrentDto);if (updateResult.Status){var todo = ToDoDtos.FirstOrDefault(t => t.Id == CurrentDto.Id);if (todo != null){todo.Title = CurrentDto.Title;todo.Content = CurrentDto.Content;todo.Status = CurrentDto.Status;}}IsIsRightDrawerOpens = false;}else//add{var addResult = await toDoService.AddAsync(CurrentDto);if (addResult.Status){ToDoDtos.Add(addResult.Result);IsIsRightDrawerOpens = false;}}}catch (Exception){throw;}finally { UpdateLoading(false); }}}

修改API中TodoController的代码

        [HttpPost]public async Task<ApiResponse> Update(TodoDto toDo){return await toDoService.UpdateEntityAsync(toDo);}

13、F5运行项目，测试修改待办

保存的时候报错：

{"type":"https://tools.ietf.org/html/rfc7231#section-6.5.1","title":"One or more validation errors occurred.","status":400,"traceId":"00-40d7073ee1cf77c77875996f55f65034-4888403c8bef54ca-00","errors":{"toDo":["The toDo field is required."],"$.Status":["The JSON value could not be converted to System.String. Path: $.Status | LineNumber: 0 | BytePositionInLine: 59."]}}

后来发现是实体类引用错误导致，重新引用WPFProjectShared.Dtos.TodoDto,

另外一个报错：

{"type":"https://tools.ietf.org/html/rfc7231#section-6.5.1","title":"One or more validation errors occurred.","status":400,"traceId":"00-25e255d827e2947f869ccba30a1714e4-b2423a142252e535-00","errors":{"$":["'-' is invalid within a number, immediately after a sign character ('+' or '-'). Expected a digit ('0'-'9'). Path: $ | LineNumber: 0 | BytePositionInLine: 1."],"toDo":["The toDo field is required."]}}

修改请求参数的格式application/json

ToDoView.xmal完整代码：

<UserControlx:Class="WPFProject.Views.ToDoView"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:i="http://schemas.microsoft.com/xaml/behaviors"xmlns:local="clr-namespace:WPFProject.Views"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"xmlns:md="http://materialdesigninxaml.net/winfx/xaml/themes"d:DesignHeight="450"d:DesignWidth="800"mc:Ignorable="d"><md:DialogHost><md:DrawerHost IsRightDrawerOpen="{Binding IsIsRightDrawerOpens}"><md:DrawerHost.RightDrawerContent><DockPanel Width="300" LastChildFill="False"><TextBlockPadding="20,10"DockPanel.Dock="Top"FontSize="20"FontWeight="Bold"Text="添加待办" /><StackPanelMargin="20"DockPanel.Dock="Top"Orientation="Horizontal"><TextBlock VerticalAlignment="Center" Text="状态：" /><ComboBox SelectedIndex="{Binding CurrentDto.Status}"><ComboBoxItem>待办</ComboBoxItem><ComboBoxItem>已完成</ComboBoxItem></ComboBox></StackPanel><TextBoxMargin="20,5"md:HintAssist.Hint="请输入待办概要"DockPanel.Dock="Top"Text="{Binding CurrentDto.Title}" /><TextBoxMinHeight="100"Margin="20,10"md:HintAssist.Hint="请输入待办事项内容"DockPanel.Dock="Top"Text="{Binding CurrentDto.Content}" /><ButtonMargin="20,0"Command="{Binding ExecuteCommand}"CommandParameter="保存"Content="添加到待办"DockPanel.Dock="Top" /></DockPanel></md:DrawerHost.RightDrawerContent><Grid><Grid.RowDefinitions><RowDefinition Height="auto" /><RowDefinition /></Grid.RowDefinitions><StackPanelMargin="15,15,0,0"VerticalAlignment="Center"Orientation="Horizontal"><TextBoxWidth="250"md:HintAssist.Hint="查找待办事项..."md:TextFieldAssist.HasClearButton="True"Text="{Binding Search, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"><TextBox.InputBindings><KeyBindingKey="Enter"Command="{Binding ExecuteCommand}"CommandParameter="查询" /></TextBox.InputBindings></TextBox><TextBlockMargin="10,0,5,0"VerticalAlignment="Center"Text="筛选：" /><ComboBox Width="80" SelectedIndex="0"><ComboBoxItem>全部</ComboBoxItem><ComboBoxItem>待办</ComboBoxItem><ComboBoxItem>已完成</ComboBoxItem></ComboBox></StackPanel><ButtonMargin="10,0"HorizontalAlignment="Right"Command="{Binding ExecuteCommand}"CommandParameter="新增"Content="+ 添加待办" /><ScrollViewer Grid.Row="1"><ItemsControlGrid.Row="1"Margin="0,20"HorizontalAlignment="Center"ItemsSource="{Binding ToDoDtos}"><ItemsControl.ItemsPanel><ItemsPanelTemplate><WrapPanel /></ItemsPanelTemplate></ItemsControl.ItemsPanel><ItemsControl.ItemTemplate><DataTemplate><md:TransitioningContent OpeningEffect="{md:TransitionEffect Kind=ExpandIn}"><GridWidth="220"MinHeight="180"MaxHeight="250"Margin="8"><i:Interaction.Triggers><i:EventTrigger EventName="MouseLeftButtonUp"><i:InvokeCommandAction Command="{Binding DataContext.SelectedCommand, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=ItemsControl}}" CommandParameter="{Binding}" /></i:EventTrigger></i:Interaction.Triggers><Grid.RowDefinitions><RowDefinition Height="auto" /><RowDefinition /></Grid.RowDefinitions><md:PopupBox HorizontalAlignment="Right" Panel.ZIndex="1"><Button Content="删除" /></md:PopupBox><BorderGrid.RowSpan="2"Background="#10B136"CornerRadius="5" /><TextBlockPadding="10,5"FontWeight="Bold"Text="{Binding Title}" /><TextBlockGrid.Row="1"Padding="10,5"Text="{Binding Content}" /><Canvas Grid.RowSpan="2" ClipToBounds="True"><!--  切割  --><BorderCanvas.Top="20"Canvas.Right="-80"Width="120"Height="120"Background="#FFFFFF"CornerRadius="60"Opacity="0.1" /><BorderCanvas.Top="100"Canvas.Right="-40"Width="140"Height="140"Background="#FFFFFF"CornerRadius="70"Opacity="0.1" /></Canvas></Grid></md:TransitioningContent></DataTemplate></ItemsControl.ItemTemplate></ItemsControl></ScrollViewer></Grid></md:DrawerHost></md:DialogHost>
</UserControl>

ToDoViewModel.cs完整代码

using Prism.Commands;
using Prism.Ioc;
using Prism.Mvvm;
using Prism.Regions;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using WPFProject.Common.Models;
using WPFProject.Service;
using WPFProjectShared.Dtos;namespace WPFProject.ViewModels
{public class ToDoViewModel : NavigationViewModel{private readonly IToDoService toDoService;public ToDoViewModel(IToDoService toDoService, IContainerProvider provider) : base(provider){ToDoDtos = new ObservableCollection<TodoDto>();ExecuteCommand = new DelegateCommand<string>(Execute);SelectedCommand = new DelegateCommand<TodoDto>(Selected);this.toDoService = toDoService;}private void Execute(string obj){switch (obj){case "新增":Add();break;case "查询":Query();break;case "保存":Save();break;}}private async void Save(){if (string.IsNullOrWhiteSpace(CurrentDto.Title) || string.IsNullOrWhiteSpace(CurrentDto.Content)){return;}else{UpdateLoading(true);try{if (CurrentDto.Id > 0)//update{var updateResult = await toDoService.UpdateAsync(CurrentDto);if (updateResult.Status){var todo = ToDoDtos.FirstOrDefault(t => t.Id == CurrentDto.Id);if (todo != null){todo.Title = CurrentDto.Title;todo.Content = CurrentDto.Content;todo.Status = CurrentDto.Status;}}IsIsRightDrawerOpens = false;}else//add{var addResult = await toDoService.AddAsync(CurrentDto);if (addResult.Status){ToDoDtos.Add(addResult.Result);IsIsRightDrawerOpens = false;}}}catch (Exception){throw;}finally { UpdateLoading(false); }}}private void Query(){GetDataAsync();}/// <summary>/// 添加待办/// </summary>/// <exception cref="NotImplementedException"></exception>private void Add(){CurrentDto = new TodoDto();IsIsRightDrawerOpens = true;}private async void Selected(TodoDto obj){try{UpdateLoading(true);var todoResult = await toDoService.GetFirstOfDefaultAsync(obj.Id);if (todoResult.Status){IsIsRightDrawerOpens = true;CurrentDto = todoResult.Result;}}catch (Exception){throw;}finally{UpdateLoading(false);}}public DelegateCommand<string> ExecuteCommand { get; private set; }public DelegateCommand<TodoDto> SelectedCommand { get;private set; }private bool isIsRightDrawerOpens;/// <summary>/// 右侧新增窗口是否打开/// </summary>public bool IsIsRightDrawerOpens{get { return isIsRightDrawerOpens; }set { isIsRightDrawerOpens = value; RaisePropertyChanged(); }}private TodoDto currentDto;/// <summary>/// 编辑选中/新增时的对象/// </summary>public TodoDto CurrentDto{get { return currentDto; }set { currentDto = value; RaisePropertyChanged(); }}private string search;/// <summary>/// 搜索条件/// </summary>public string Search{get { return search; }set { search = value; RaisePropertyChanged(); }}private ObservableCollection<TodoDto> toDoDtos;public ObservableCollection<TodoDto> ToDoDtos{get { return toDoDtos; }set { toDoDtos = value; }}/// <summary>/// 获取数据/// </summary>private async void GetDataAsync(){UpdateLoading(true);var todoResult = await toDoService.GetAllPageListAsync(new WPFProjectShared.Parameters.QueryParameter{PageIndex = 0,PageSize = 100,Search = Search});if (todoResult.Status){toDoDtos.Clear();foreach (var item in todoResult.Result.Items){toDoDtos.Add(item);}}UpdateLoading(false);}public override void OnNavigatedTo(NavigationContext navigationContext){base.OnNavigatedTo(navigationContext);GetDataAsync();}}
}

备忘录也相应修改，完整代码如下：

MemoView.xmal

<UserControlx:Class="WPFProject.Views.MemoView"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:i="http://schemas.microsoft.com/xaml/behaviors"xmlns:local="clr-namespace:WPFProject.Views"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"xmlns:md="http://materialdesigninxaml.net/winfx/xaml/themes"d:DesignHeight="450"d:DesignWidth="800"mc:Ignorable="d"><md:DialogHost><md:DrawerHost IsRightDrawerOpen="{Binding IsIsRightDrawerOpens}"><md:DrawerHost.RightDrawerContent><DockPanel Width="300" LastChildFill="False"><TextBlockPadding="20,10"DockPanel.Dock="Top"FontSize="20"FontWeight="Bold"Text="添加备忘录" /><TextBoxMargin="20,5"md:HintAssist.Hint="请输入备忘录概要"DockPanel.Dock="Top"Text="{Binding CurrentDto.Title}" /><TextBoxMinHeight="100"Margin="20,10"md:HintAssist.Hint="请输入备忘录内容"DockPanel.Dock="Top"Text="{Binding CurrentDto.Content}" /><ButtonMargin="20,0"Command="{Binding ExecuteCommand}"CommandParameter="保存"Content="添加到备忘录"DockPanel.Dock="Top" /></DockPanel></md:DrawerHost.RightDrawerContent><Grid><Grid.RowDefinitions><RowDefinition Height="auto" /><RowDefinition /></Grid.RowDefinitions><StackPanelMargin="15,15,0,0"VerticalAlignment="Center"Orientation="Horizontal"><TextBoxWidth="250"md:HintAssist.Hint="查找备忘录..."md:TextFieldAssist.HasClearButton="True"Text="{Binding Search, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"><TextBox.InputBindings><KeyBindingKey="Enter"Command="{Binding ExecuteCommand}"CommandParameter="查询" /></TextBox.InputBindings></TextBox></StackPanel><ButtonMargin="10,0"HorizontalAlignment="Right"Command="{Binding ExecuteCommand}"CommandParameter="新增"Content="+ 添加备忘录" /><ScrollViewer Grid.Row="1"><ItemsControlMargin="0,20"HorizontalAlignment="Center"ItemsSource="{Binding MemoDtos}"><ItemsControl.ItemsPanel><ItemsPanelTemplate><WrapPanel /></ItemsPanelTemplate></ItemsControl.ItemsPanel><ItemsControl.ItemTemplate><DataTemplate><md:TransitioningContent OpeningEffect="{md:TransitionEffect Kind=ExpandIn}"><GridWidth="220"MinHeight="180"MaxHeight="250"Margin="8"><i:Interaction.Triggers><i:EventTrigger EventName="MouseLeftButtonUp"><i:InvokeCommandAction Command="{Binding DataContext.SelectedCommand, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=ItemsControl}}" CommandParameter="{Binding}" /></i:EventTrigger></i:Interaction.Triggers><Grid.RowDefinitions><RowDefinition Height="auto" /><RowDefinition /></Grid.RowDefinitions><md:PopupBox HorizontalAlignment="Right" Panel.ZIndex="1"><Button Content="删除" /></md:PopupBox><BorderGrid.RowSpan="2"Background="#10B136"CornerRadius="5" /><TextBlockPadding="10,5"FontWeight="Bold"Text="{Binding Title}" /><TextBlockGrid.Row="1"Padding="10,5"Text="{Binding Content}" /><Canvas Grid.RowSpan="2" ClipToBounds="True"><!--  切割  --><BorderCanvas.Top="20"Canvas.Right="-80"Width="120"Height="120"Background="#FFFFFF"CornerRadius="60"Opacity="0.1" /><BorderCanvas.Top="100"Canvas.Right="-40"Width="140"Height="140"Background="#FFFFFF"CornerRadius="70"Opacity="0.1" /></Canvas></Grid></md:TransitioningContent></DataTemplate></ItemsControl.ItemTemplate></ItemsControl></ScrollViewer></Grid></md:DrawerHost></md:DialogHost>
</UserControl>

MemoViewModel.cs

using Prism.Commands;
using Prism.Ioc;
using Prism.Regions;
using System;
using System.Collections.ObjectModel;
using System.Linq;
using WPFProject.Common.Models;
using WPFProject.Service;
using WPFProjectShared.Dtos;namespace WPFProject.ViewModels
{public class MemoViewModel : NavigationViewModel{private readonly IMemoService memoService;public MemoViewModel(IMemoService memoService, IContainerProvider provider) : base(provider){MemoDtos = new ObservableCollection<MemoDto>();ExecuteCommand = new DelegateCommand<string>(Execute);SelectedCommand = new DelegateCommand<MemoDto>(Selected);this.memoService = memoService;}private void Execute(string obj){switch (obj){case "新增":Add();break;case "查询":Query();break;case "保存":Save();break;}}private async void Save(){if (string.IsNullOrWhiteSpace(CurrentDto.Title) || string.IsNullOrWhiteSpace(CurrentDto.Content)){return;}else{UpdateLoading(true);try{if (CurrentDto.Id > 0)//update{var updateResult = await memoService.UpdateAsync(CurrentDto);if (updateResult.Status){var todo = MemoDtos.FirstOrDefault(t => t.Id == CurrentDto.Id);if (todo != null){todo.Title = CurrentDto.Title;todo.Content = CurrentDto.Content;}}IsIsRightDrawerOpens = false;}else//add{var addResult = await memoService.AddAsync(CurrentDto);if (addResult.Status){MemoDtos.Add(addResult.Result);IsIsRightDrawerOpens = false;}}}catch (Exception){throw;}finally { UpdateLoading(false); }}}private void Query(){GetDataAsync();}private async void Selected(MemoDto obj){try{UpdateLoading(true);var memoResult = await memoService.GetFirstOfDefaultAsync(obj.Id);if (memoResult.Status){IsIsRightDrawerOpens = true;CurrentDto = memoResult.Result;}}catch (Exception){throw;}finally{UpdateLoading(false);}}private void Add(){CurrentDto = new MemoDto();IsIsRightDrawerOpens = true;}public DelegateCommand AddCommand { get; private set; }public DelegateCommand<MemoDto> SelectedCommand { get; private set; }public DelegateCommand<string> ExecuteCommand { get; private set; }private bool isIsRightDrawerOpens;public bool IsIsRightDrawerOpens{get { return isIsRightDrawerOpens; }set { isIsRightDrawerOpens = value; RaisePropertyChanged(); }}private ObservableCollection<MemoDto> memoDtos;public ObservableCollection<MemoDto> MemoDtos{get { return memoDtos; }set { memoDtos = value; RaisePropertyChanged(); }}private MemoDto currentDto;/// <summary>/// 新增/编辑 选中数据/// </summary>public MemoDto CurrentDto{get { return currentDto; }set { currentDto = value; RaisePropertyChanged(); }}private string search;/// <summary>/// 搜索条件/// </summary>public string Search{get { return search; }set { search = value; RaisePropertyChanged(); }}private async void GetDataAsync(){UpdateLoading(true);var memoResult = await memoService.GetAllPageListAsync(new WPFProjectShared.Parameters.QueryParameter{PageIndex = 0,PageSize = 100,Search = Search});if (memoResult.Status){memoDtos.Clear();foreach (var item in memoResult.Result.Items){memoDtos.Add(item);}}UpdateLoading(false);}public override void OnNavigatedTo(NavigationContext navigationContext){base.OnNavigatedTo(navigationContext);GetDataAsync();}}
}