如何使用 MVVM 使用 WPF C# 在 Datagrid ComboBox 中显示和选择项目 [英] How to Display and select items in a Datagrid ComboBox with WPF C#, using MVVM
问题描述
我希望能够从 wpf Datagrid 中的 ComboBox 中选择真"或假"(布尔值)，并且能够将该选择保存到我的数据库中.
I want to be able to choose either "true" or "false"(boolean) from a ComboBox that is within a wpf Datagrid and be able to save that choice to my database.
我希望能够通过保存到我的数据库中的布尔变量作为位 (1 = true; 0 = false) 来指示列内部是否该行是活动的".
I want to be able to indicate inside of a column if the row is "Active" or not through a boolean variable saved to my database as a bit(1 = true; 0 = false).
这是我的创建表语句:创建表声明(AccountType)
我使用 ObservableCollection 填充数据网格，如下所示:
I populate the datagrid using an ObservableCollection as follows:
protected override void Get()
{
using (var dbContext = new IEMASEntitiesDataContext())
{
var accountType = from s in dbContext.AccountTypes select s;
var observable = new ObservableCollection<AccountType>(accountType);
Collection = observable;
}
}
我的XAML代码如下:
My XAML code is as follows:
<DockPanel DataContext="{StaticResource ResourceKey=AccountTypeViewModel}" LastChildFill="True">
<ToolBar DockPanel.Dock="Top">
<Button Content="Display" Command="{Binding GetCommand}" Width="78"/>
<Button Content="Save" Command="{Binding SaveCommand}" Width="78"/>
</ToolBar>
<Grid>
<GroupBox x:Name="AccountTypeGroupBox">
<DataGrid x:Name="DataGridAccountType" ItemsSource="{Binding Collection}" AutoGenerateColumns="False">
<DataGrid.Columns>
<DataGridTextColumn Header="AccountType" Width="150" Binding="{Binding Path=AccountTypeName, Mode=TwoWay, NotifyOnSourceUpdated=True, UpdateSourceTrigger=PropertyChanged}"/>
<DataGridComboBoxColumn Header="Active" Width="100" SelectedValueBinding="{Binding StatusList, UpdateSourceTrigger=PropertyChanged}" SelectedValuePath="AccountTypeId" DisplayMemberPath="Active"/>
<DataGridTemplateColumn Width="50" Header="Delete">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<Button x:Name="btnDelete" Content="Delete" Command="{Binding DeleteCommand}"/>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
</DataGrid.Columns>
</DataGrid>
</GroupBox>
</Grid>
</DockPanel>
它不起作用.组合框中没有显示任何内容，而且我不知道在显示所选项目时如何将其保存到 SQL Server 数据库中.我很感激一些帮助，请.我正在使用 LINQ TO SQL.我是新手:-(.
It doesn't work. Nothing displays within the comboboxes, and I don't know how to save the selected item to the SQL Server database when it does display. I'd appreciate some help, please. I am using LINQ TO SQL. I am a newbie :-(.
推荐答案
据我所知，问题是如何将一些 XAML 资源绑定为组合项源，以及如何将组合的选定值绑定到后面的模型DataGrid 行.1. 列表项:
As I can understand the problem is how to bind some XAML resource as a combo ItemsSource and in addtion how to binnd the selected value of a combo to the model behind the DataGrid row. 1. List item:
<Window x:Class="SoDataGridProjectsHelpAttempt.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:soDataGridProjectsHelpAttempt="clr-namespace:SoDataGridProjectsHelpAttempt"
xmlns:system="clr-namespace:System;assembly=mscorlib"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<x:Array x:Key="CountriesArray" Type="soDataGridProjectsHelpAttempt:Country">
<soDataGridProjectsHelpAttempt:Country CountryName="Germany" CountryPop="150k"/>
<soDataGridProjectsHelpAttempt:Country CountryName="France" CountryPop="125k"/>
<soDataGridProjectsHelpAttempt:Country CountryName="Belarus" CountryPop="165k"/>
</x:Array>
<x:Array x:Key="StatusArray" Type="soDataGridProjectsHelpAttempt:ActivityStatus">
<soDataGridProjectsHelpAttempt:ActivityStatus VerbalStatus="Yes" BoolStatus="True"/>
<soDataGridProjectsHelpAttempt:ActivityStatus VerbalStatus="No" BoolStatus="False"/>
</x:Array>
</Window.Resources>
<Window.DataContext>
<soDataGridProjectsHelpAttempt:DataGridMainDataContext/>
</Window.DataContext>
<Grid>
<DataGrid ItemsSource="{Binding Collection}" AutoGenerateColumns="False" CanUserAddRows="True">
<DataGrid.Columns>
<DataGridTextColumn Width="Auto" Binding="{Binding UName}"/>
<DataGridComboBoxColumn Header="Country" DisplayMemberPath="CountryName"
ItemsSource="{StaticResource CountriesArray}" Width="Auto"
SelectedItemBinding="{Binding CountryData}"/>
<!--<DataGridComboBoxColumn Header="ActivityStatus" Width="Auto" ItemsSource="{StaticResource StatusArray}"
SelectedValueBinding="{Binding IsActive}" SelectedValuePath="BoolStatus" DisplayMemberPath="VerbalStatus"/>-->
<DataGridComboBoxColumn Header="ActivityStatus" SelectedItemBinding="{Binding IsActive, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}">
<DataGridComboBoxColumn.ItemsSource>
<x:Array Type="system:Boolean">
<system:Boolean>True</system:Boolean>
<system:Boolean>False</system:Boolean>
</x:Array>
</DataGridComboBoxColumn.ItemsSource>
</DataGridComboBoxColumn>
</DataGrid.Columns>
</DataGrid>
</Grid>
DataGrid 视图模型:
DataGrid viewmodel:
public class DataGridMainDataContext
{公共 DataGridMainDataContext(){Collection = new ObservableCollection(新列表{新用户数据{UName = "格雷格",IsActive = 假，},新用户数据{UName = "乔",IsActive = 假，},新用户数据{UName = "IV",IsActive = 假，}});
{ public DataGridMainDataContext() { Collection = new ObservableCollection(new List { new UserData { UName = "Greg", IsActive = false, }, new UserData { UName = "Joe", IsActive = false, }, new UserData { UName = "Iv", IsActive = false, } });
}
public ObservableCollection<UserData> Collection { get; set; }
}
型号:公共类 UserData : BaseObservableObject{私人字符串_uName;私有对象_countryData；私人布尔_isActive;
Models: public class UserData : BaseObservableObject { private string _uName; private object _countryData; private bool _isActive;
public bool IsActive
{
get { return _isActive; }
set
{
_isActive = value;
OnPropertyChanged();
}
}
public string UName
{
get { return _uName; }
set
{
_uName = value;
OnPropertyChanged();
}
}
public object CountryData
{
get { return _countryData; }
set
{
_countryData = value;
OnPropertyChanged();
}
}
}
公共类ActivityStatus:BaseObservableObject{私人布尔_boolStatus;私人字符串_verbalStatus;
public class ActivityStatus:BaseObservableObject { private bool _boolStatus; private string _verbalStatus;
public bool BoolStatus
{
get { return _boolStatus; }
set
{
_boolStatus = value;
OnPropertyChanged();
}
}
public string VerbalStatus
{
get { return _verbalStatus; }
set
{
_verbalStatus = value;
OnPropertyChanged();
}
}
}
公共类国家:BaseObservableObject{私人字符串 _countryName;私人字符串_countryPop;
public class Country : BaseObservableObject { private string _countryName; private string _countryPop;
public string CountryName
{
get { return _countryName; }
set
{
_countryName = value;
OnPropertyChanged();
}
}
public string CountryPop
{
get { return _countryPop; }
set
{
_countryPop = value;
OnPropertyChanged();
}
}
public Country() { }
public Country(string n, string d)
{
this.CountryName = n;
this.CountryPop = d;
}
}希望能帮到你.
问候，
这篇关于如何使用 MVVM 使用 WPF C# 在 Datagrid ComboBox 中显示和选择项目的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
