C# 使用ObservableCollection<;字典<;字符串,对象>&燃气轮机;作为WPF中的DataGrid Itemsource
我有一个C# 使用ObservableCollection<;字典<;字符串,对象>&燃气轮机;作为WPF中的DataGrid Itemsource,c#,wpf,xaml,mvvm,C#,Wpf,Xaml,Mvvm,我有一个DataGrid,我设置ItemsSource是一个observedcollection对象 通常,我只需定义一个ClassA并将observateCollection设置为ItemsSource,就可以将属性名称绑定到ClassA的列(DataGridTextColumn) 但我不知道如何绑定字典的键/值 有什么支持吗?您的问题相当复杂,为了创建observedictionary您应该创建一个实现以下功能的类: IDictionary INotifyCollectionChanged
DataGrid
,我设置ItemsSource
是一个observedcollection
对象
通常,我只需定义一个ClassA
并将observateCollection
设置为ItemsSource,就可以将属性名称绑定到ClassA的列(DataGridTextColumn
)
但我不知道如何绑定字典的键/值
有什么支持吗?您的问题相当复杂,为了创建
observedictionary
您应该创建一个实现以下功能的类:
IDictionary
INotifyCollectionChanged
INotifyPropertyChanged
ICollection<KeyValuePair<TKey,TValue>>
IEnumerable<KeyValuePair<TKey,TValue>>
IEnumerable
IDictionary
INotifyCollectionChanged
InotifyProperty已更改
I收集
数不清
数不清
接口。在这里。这种实现的一个例子是:
class ObservableDictionary<TKey, TValue> : IDictionary, INotifyCollectionChanged, INotifyPropertyChanged
{
private Dictionary<TKey, TValue> mDictionary;
//Methods & Properties for IDictionary implementation would defer to mDictionary:
public void Add(TKey key, TValue value)
{
mDictionary.Add(key, value);
OnCollectionChanged(NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, value)
return;
}
//Implementation of INotifyCollectionChanged:
public event NotifyCollectionChangedEventHandler CollectionChanged;
protected void OnCollectionChanged(NotifyCollectionChangedEventArgs args)
{
//event fire implementation
}
//Implementation of INotifyProperyChanged:
public event ProperyChangedEventHandler ProperyChanged;
protected void OnPropertyChanged(PropertyChangedEventArgs args)
{
//event fire implementation
}
}
类ObservalEdictionary:IDictionary、INotifyCollectionChanged、INotifyPropertyChanged
{
私人词典;
//IDictionary实现的方法和属性将遵从mDictionary:
公共无效添加(TKey键,TValue值)
{
mDictionary.Add(键、值);
OnCollectionChanged(NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add,value)
返回;
}
//InotifyCollection的实施已更改:
公共事件通知CollectionChangedEventHandler CollectionChanged;
CollectionChanged上受保护的void(NotifyCollectionChangedEventArgs args)
{
//事件火实现
}
//InotifyProperty的实施已更改:
公共事件属性更改事件处理程序属性更改;
PropertyChanged上受保护的无效(PropertyChangedEventArgs args)
{
//事件火实现
}
}
另一种是可绑定动态词典,它将每个词典条目作为属性公开
public sealed class BindableDynamicDictionary : DynamicObject, INotifyPropertyChanged
{
/// <summary>
/// The internal dictionary.
/// </summary>
private readonly Dictionary<string, object> _dictionary;
/// <summary>
/// Creates a new BindableDynamicDictionary with an empty internal dictionary.
/// </summary>
public BindableDynamicDictionary()
{
_dictionary = new Dictionary<string, object>();
}
/// <summary>
/// Copies the contents of the given dictionary to initilize the internal dictionary.
/// </summary>
public BindableDynamicDictionary(IDictionary<string, object> source)
{
_dictionary = new Dictionary<string, object>(source);
}
/// <summary>
/// You can still use this as a dictionary.
/// </summary>
public object this[string key]
{
get { return _dictionary[key]; }
set
{
_dictionary[key] = value;
RaisePropertyChanged(key);
}
}
/// <summary>
/// This allows you to get properties dynamically.
/// </summary>
public override bool TryGetMember(GetMemberBinder binder, out object result)
{
return _dictionary.TryGetValue(binder.Name, out result);
}
/// <summary>
/// This allows you to set properties dynamically.
/// </summary>
public override bool TrySetMember(SetMemberBinder binder, object value)
{
_dictionary[binder.Name] = value;
RaisePropertyChanged(binder.Name);
return true;
}
/// <summary>
/// This is used to list the current dynamic members.
/// </summary>
public override IEnumerable<string> GetDynamicMemberNames()
{
return _dictionary.Keys;
}
public event PropertyChangedEventHandler PropertyChanged;
private void RaisePropertyChanged(string propertyName)
{
var propChange = PropertyChanged;
if (propChange == null) return;
propChange(this, new PropertyChangedEventArgs(propertyName));
}
}
公共密封类BindableDynamicDictionary:DynamicObject,INotifyPropertyChanged
{
///
///内部字典。
///
私人只读词典;
///
///使用空的内部字典创建新的BindableDynamicDictionary。
///
公共BindableDynamicDictionary()
{
_字典=新字典();
}
///
///复制给定词典的内容以初始化内部词典。
///
公共BindableDynamicDictionary(IDictionary源)
{
_字典=新字典(来源);
}
///
///你仍然可以把它用作字典。
///
公共对象此[字符串键]
{
获取{return _dictionary[key];}
设置
{
_字典[键]=值;
RaisePropertyChanged(键);
}
}
///
///这允许您动态获取属性。
///
公共重写bool TryGetMember(GetMemberBinder绑定器,输出对象结果)
{
返回_dictionary.TryGetValue(binder.Name,out结果);
}
///
///这允许您动态设置属性。
///
public override bool TrySetMember(SetMemberBinder绑定器,对象值)
{
_字典[binder.Name]=值;
RaisePropertyChanged(活页夹名称);
返回true;
}
///
///用于列出当前动态成员。
///
公共重写IEnumerable GetDynamicMemberNames()
{
返回_dictionary.Keys;
}
公共事件属性更改事件处理程序属性更改;
私有void RaisePropertyChanged(字符串propertyName)
{
var propChange=PROPERTYCHANGE;
if(propChange==null)返回;
propChange(这是新的PropertyChangedEventArgs(propertyName));
}
}
然后你可以这样使用它:
private void testButton1_Click(object sender, RoutedEventArgs e)
{
var dd = new BindableDynamicDictionary(); // Creating a dynamic dictionary.
dd["Age"] = 32; //access like any dictionary
dynamic person = dd; //or as a dynamic
person.FirstName = "Alan"; // Adding new dynamic properties. The TrySetMember method is called.
person.LastName = "Evans";
//hacky for short example, should have a view model and use datacontext
var collection = new ObservableCollection<object>();
collection.Add(person);
dataGrid1.ItemsSource = collection;
}
private void testButton1\u单击(对象发送者,路由目标)
{
var dd=new BindableDynamicDictionary();//创建动态字典。
dd[“Age”]=32;//像任何字典一样访问
dynamic person=dd;//或作为动态
person.FirstName=“Alan”//添加新的动态属性。调用TrySetMember方法。
person.LastName=“Evans”;
//例如,hacky应该有一个视图模型并使用datacontext
var collection=新的ObservableCollection();
收集。添加(人);
dataGrid1.ItemsSource=集合;
}
Datagrid需要自定义代码来构建列:
XAML:
AutoGeneratedColumns事件:
private void dataGrid1_AutoGeneratedColumns(object sender, EventArgs e)
{
var dg = sender as DataGrid;
var first = dg.ItemsSource.Cast<object>().FirstOrDefault() as DynamicObject;
if (first == null) return;
var names = first.GetDynamicMemberNames();
foreach(var name in names)
{
dg.Columns.Add(new DataGridTextColumn { Header = name, Binding = new Binding(name) });
}
}
private void dataGrid1\u自动生成列(对象发送方,事件参数e)
{
var dg=发送方作为数据网格;
var first=dg.ItemsSource.Cast().FirstOrDefault()作为DynamicObject;
if(first==null)返回;
var name=first.GetDynamicMemberNames();
foreach(名称中的变量名称)
{
Add(newdatagridtextcolumn{Header=name,Binding=newbinding(name)});
}
}
您的问题相当复杂,为了创建observedictionary
您应该创建一个实现以下功能的类:
IDictionary
INotifyCollectionChanged
INotifyPropertyChanged
ICollection<KeyValuePair<TKey,TValue>>
IEnumerable<KeyValuePair<TKey,TValue>>
IEnumerable
IDictionary
INotifyCollectionChanged
InotifyProperty已更改
I收集
数不清
数不清
接口。在这里。此类实现的一个示例是:
class ObservableDictionary<TKey, TValue> : IDictionary, INotifyCollectionChanged, INotifyPropertyChanged
{
private Dictionary<TKey, TValue> mDictionary;
//Methods & Properties for IDictionary implementation would defer to mDictionary:
public void Add(TKey key, TValue value)
{
mDictionary.Add(key, value);
OnCollectionChanged(NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, value)
return;
}
//Implementation of INotifyCollectionChanged:
public event NotifyCollectionChangedEventHandler CollectionChanged;
protected void OnCollectionChanged(NotifyCollectionChangedEventArgs args)
{
//event fire implementation
}
//Implementation of INotifyProperyChanged:
public event ProperyChangedEventHandler ProperyChanged;
protected void OnPropertyChanged(PropertyChangedEventArgs args)
{
//event fire implementation
}
}
类ObservalEdictionary:IDictionary、INotifyCollectionChanged、INotifyPropertyChanged
{
私人词典;
//IDictionary实现的方法和属性将遵从mDictionary:
公共无效添加(TKey键,TValue值)
{
mDictionary.Add(键、值);
OnCollectionChanged(NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add,value)
返回;
}
//InotifyCollection的实施已更改:
公共事件通知CollectionChangedEventHandler CollectionChanged;
CollectionChanged上受保护的void(NotifyCollectionChangedEventArgs args)
{
//事件火实现
}
//InotifyProperty的实施已更改:
公共事件属性更改事件处理程序属性更改;
保护空隙