如何解决将字段绑定到数据库并在XamDataGrid中显示
早上好
在将所有XamComboBoxEditor字段绑定到XamDataGrid时,我面临着一个很大的问题
在我的数据库中,我有2个表:
帐户
index
和Acc_Link
snapshot.data.documents[index].documentID
我需要在XamDataGrid 3组合框列中显示:
帐户标题组合框,其中包含Acc_Link表中的所有Acc_LinkTitles
包含帐户表中所有代码的代码组合框
“名称”组合框,其中包含“帐户”表中的所有名称
为了方便我的工作,我创建了一个名为Acc_LinkObsrvable的类,其中包含上述字段
但是无论我如何尝试,运行代码时XamDataGrid都不会显示任何内容。我尝试将代码添加到main的FieldInitialized事件中,以便在代码运行时加载该代码,但再次没有出现
我将发布我的代码,请帮助我。
Acc_LinkObsrvable类:
public int AccountId { get; set; }
public string Code { get; set; }
public string Code2 { get; set; }
public string Name { get; set; }
public int Parent { get; set; }
XAML:
public int Acc_LinkId { get; set; }
public string Acc_LinkTitle { get; set; }
在主窗口中:
public string Acc_LinkTitle { get; set; }
public string Code { get; set; }
public string Name { get; set; }
解决方法
Acc_LinkObservable类应实现INotifyPropertyChanged接口。例如:
public class Acc_LinkObservable : INotifyPropertyChanged
{
public Acc_LinkObservable(string title,string code,string name)
{
_acc_LinkTitle = title;
_code = code;
_name = name;
}
public string Acc_LinkTitle
{
get { return _acc_LinkTitle; }
set
{
if (_acc_LinkTitle != value)
{
_acc_LinkTitle = value;
NotifyPropertyChanged("Acc_LinkTitle");
}
}
}
public string Code
{
get { return _code; }
set
{
if (_code != value)
{
_code = value;
NotifyPropertyChanged("Code");
}
}
}
public string Name
{
get { return _name; }
set
{
if (_name != value)
{
_name = value;
NotifyPropertyChanged("Name");
}
}
}
public string _acc_LinkTitle;
public string _code;
public string _name;
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged(String info)
{
PropertyChanged?.Invoke(this,new PropertyChangedEventArgs(info));
}
}
之后,可以如下定义XamDataGrid的数据源:
ObservableCollection<Acc_LinkObservable> AccountInfo
因此在XAML中:<igDP:XamDataGrid DataSource= "{Binding Path=AccountInfo}"
现在必须填写AccountInfo
。
从数据绑定路径中删除 AccountDTO :
AlternateBinding = new Binding("Name"),
检查style3
(样式1代替样式3)的定义中可能出现的打印错误:
Style style3 = new Style(typeof(XamComboEditor));
style1.Setters.Add(new Setter(XamComboEditor.ItemsProviderProperty,name_provider));
,
此示例演示了不同的方法。 XAML中定义的所有字段。然后使用ComboBoxField代替XamComboEditor。
MainWindow.xaml
<Window x:Class="XamDataGridDemo.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:igWPF="http://infragistics.com/DataPresenter"
xmlns:igDP="http://infragistics.com/DataPresenter"
xmlns:viewModel="clr-namespace:XamDataGridDemo.ViewModel"
Title="XamDataGrid Demo" Height="350" Width="525" >
<Window.Resources>
<ResourceDictionary>
<viewModel:CategoriesList x:Key="Categories" />
</ResourceDictionary>
</Window.Resources>
<Grid>
<igWPF:XamDataGrid x:Name="xamDataGrid1" DataSource="{Binding Path=Products}" Margin="10" >
<igDP:XamDataGrid.FieldLayoutSettings>
<igDP:FieldLayoutSettings SelectionTypeRecord="None" SelectionTypeField="None" SelectionTypeCell="None"
AutoGenerateFields="False" HeaderPrefixAreaDisplayMode="None" RecordSelectorLocation="None" >
</igDP:FieldLayoutSettings>
</igDP:XamDataGrid.FieldLayoutSettings>
<igDP:XamDataGrid.FieldLayouts>
<igDP:FieldLayout>
<igDP:FieldLayout.Fields>
<igDP:Field Label="Name" BindingType="UseAlternateBinding" AlternateBinding="{Binding Path=Name}" HorizontalContentAlignment="Right">
<igDP:Field.Settings>
<igDP:FieldSettings Width="Auto" AllowEdit="True" />
</igDP:Field.Settings>
</igDP:Field>
<igDP:ComboBoxField Name="Category" Label="Category"
ItemsSource="{Binding Source={StaticResource Categories}}"
DisplayMemberPath="Name" />
<igDP:Field Label="Stock" BindingType="UseAlternateBinding" AlternateBinding="{Binding Path=Stock}" HorizontalContentAlignment="Right">
<igDP:Field.Settings>
<igDP:FieldSettings Width="Auto" AllowEdit="True" />
</igDP:Field.Settings>
</igDP:Field>
</igDP:FieldLayout.Fields>
</igDP:FieldLayout>
</igDP:XamDataGrid.FieldLayouts>
</igWPF:XamDataGrid>
</Grid>
</Window>
MainWindow.xaml.cs
using System.Windows;
using System.Collections.ObjectModel;
namespace XamDataGridDemo
{
public partial class MainWindow : Window
{
ObservableCollection<Product> Products = new ObservableCollection<Product>()
{
new Product("Porsche 911","Car",123),new Product("Lenox","Bicycle",45),new Product("Horizon","Boat",67)
};
public MainWindow()
{
InitializeComponent();
xamDataGrid1.DataSource = Products;
}
}
}
CategoriesList.cs
using System.Collections.ObjectModel;
using Infragistics.Samples.Shared.Models;
namespace XamDataGridDemo.ViewModel
{
public class CategoriesList : ObservableCollection<CategoryItem>
{
public CategoriesList()
{
this.Add(new CategoryItem() { Name = "Car" });
this.Add(new CategoryItem() { Name = "Bicycle" });
this.Add(new CategoryItem() { Name = "Boat" });
}
}
public class CategoryItem : ObservableModel
{
private string _name;
public string Name
{
get
{
return this._name;
}
set
{
if (this._name != value)
{
this._name = value;
this.OnPropertyChanged("Name");
}
}
}
}
}
Product.cs
using System;
using System.ComponentModel;
namespace XamDataGridDemo
{
public class Product : INotifyPropertyChanged
{
public Product(string name,string category,int stock)
{
_name = name;
_category = category;
_stock = stock;
}
public string Name
{
get { return _name; }
set
{
if (_name != value)
{
_name = value;
NotifyPropertyChanged("Name");
}
}
}
public string Category
{
get { return _category; }
set
{
if (_category != value)
{
_category = value;
NotifyPropertyChanged("Category");
}
}
}
public int Stock
{
get { return _stock; }
set
{
if (_stock != value)
{
_stock = value;
NotifyPropertyChanged("Stock");
}
}
}
public string _name;
public string _category;
public int _stock;
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged(String info)
{
PropertyChanged?.Invoke(this,new PropertyChangedEventArgs(info));
}
}
}
以下类是从Infragistics SDK复制的。
ObservableModel.cs
using System.ComponentModel;
using System.Runtime.Serialization;
namespace Infragistics.Samples.Shared.Models
{
[DataContract]
public abstract class ObservableModel : INotifyPropertyChanged
{
protected ObservableModel()
{
IsPropertyNotifyActive = true;
}
#region INotifyPropertyChanged
public bool IsPropertyNotifyActive { get; set; }
public event PropertyChangedEventHandler PropertyChanged;
protected bool HasPropertyChangedHandler()
{
PropertyChangedEventHandler handler = this.PropertyChanged;
return handler != null;
}
protected void OnPropertyChanged(object sender,PropertyChangedEventArgs e)
{
PropertyChangedEventHandler handler = this.PropertyChanged;
if (handler != null && IsPropertyNotifyActive)
handler(sender,e);
}
protected void OnPropertyChanged(PropertyChangedEventArgs e)
{
OnPropertyChanged(this,e);
}
protected void OnPropertyChanged(object sender,string propertyName)
{
OnPropertyChanged(sender,new PropertyChangedEventArgs(propertyName));
}
protected virtual void OnPropertyChanged(string propertyName)
{
OnPropertyChanged(this,new PropertyChangedEventArgs(propertyName));
}
protected delegate void PropertyChangedDelegate(object sender,string propertyName);
#endregion
}
}
如果运行此代码,则应用程序窗口将如下所示:
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