如何在WPF的datd网格中添加字典（键和值）值？ [英] How to add teh dictionary(key and values) values in datd grid in WPF?

问题描述

嗨朋友们，

我想将字典内容添加到数据网格中。

在WPF中，我尝试插入但网格显示为空。

Hi Friends,
I want to add the dictionary contents into the data grid.
In WPF, I tried to insert but grid shows as empty.

dg = new DataGrid();
dg.IsReadOnly = true;
dg.HeadersVisibility = DataGridHeadersVisibility.None;
dg.HorizontalScrollBarVisibility = ScrollBarVisibility.Visible;
dg.VerticalScrollBarVisibility = ScrollBarVisibility.Auto;
dg.AutoGenerateColumns = false;
dg.CanUserSortColumns = false;
dg.CanUserResizeColumns = false;
dg.HorizontalAlignment = System.Windows.HorizontalAlignment.Stretch;
dg.VerticalAlignment = System.Windows.VerticalAlignment.Stretch;

foreach (KeyValuePair<string, string=""> entry in spDic)
{
    var data = new KeyValue { keyString = entry.Key, valString = entry.Value };
    dg.Items.Add(data);
}
Grid.SetColumn(dg, 0);
Grid.SetColumnSpan(dg, 5);
Grid.SetRow(dg, 7);
Grid.SetRowSpan(dg, 5);
this.FormGrid.Children.Add(dg);

我的尝试：

What I have tried:

In above code i insert the Datagrid within <Grid Name="FormGrid"></Grid> at run time.

推荐答案

定义将您的Dictionary作为C＃代码中的公共属性，并在XAML中执行此操作。

Define your Dictionary as a public property in your C# code, and do this in the XAML.

<DataGrid AutoGenerateColumns="True"

          ItemsSource="{Binding MyDictionaryObject}">
    <DataGrid.Columns>
        <DataGridTextColumn Header="Key" Binding="{Binding Key}" />
        <DataGridTextColumn Header="Value" Binding="{Binding Value}" />
    </DataGrid.Columns>
</DataGrid>

您可能还需要创建一个ObservableDictionary对象来帮助WPF。< br $> b $ b

You may also need to create an ObservableDictionary object to help WPF.

erializable]
public class ObservableKeyValuePair<TKey,TValue>:INotifyPropertyChanged
{
    #region properties
    private TKey key;
    private TValue value;

    public TKey Key
    {
        get { return key; }
        set
        {
            key = value;
            OnPropertyChanged("Key");
        }
    }

    public TValue Value
    {
        get { return value; }
        set
        {
            this.value = value;
            OnPropertyChanged("Value");
        }
    } 
    #endregion

    #region INotifyPropertyChanged Members

    [field:NonSerialized]
    public event PropertyChangedEventHandler PropertyChanged;

    public void OnPropertyChanged(string name)
    {
        PropertyChangedEventHandler handler = PropertyChanged;
        if (handler != null) handler(this, new PropertyChangedEventArgs(name));
    }

    #endregion
}

[Serializable]
public class ObservableDictionary<TKey,TValue>:ObservableCollection<ObservableKeyValuePair<TKey,TValue>>, IDictionary<TKey,TValue>
{

    #region IDictionary<TKey,TValue> Members

    public void Add(TKey key, TValue value)
    {
        if (ContainsKey(key))
        {
            throw new ArgumentException("The dictionary already contains the key");
        }
        base.Add(new ObservableKeyValuePair<TKey, TValue>() {Key = key, Value = value});
    }

    public bool ContainsKey(TKey key)
    {
        //var m=base.FirstOrDefault((i) => i.Key == key);
        var r = ThisAsCollection().FirstOrDefault((i) => Equals(key, i.Key));

        return !Equals(default(ObservableKeyValuePair<TKey, TValue>), r);
    }

    bool Equals<TKey>(TKey a, TKey b)
    {
        return EqualityComparer<TKey>.Default.Equals(a, b);
    }

    private ObservableCollection<ObservableKeyValuePair<TKey, TValue>> ThisAsCollection()
    {
        return this;
    }

    public ICollection<TKey> Keys
    {
        get { return (from i in ThisAsCollection() select i.Key).ToList(); }
    }

    public bool Remove(TKey key)
    {
        var remove = ThisAsCollection().Where(pair => Equals(key, pair.Key)).ToList();
        foreach (var pair in remove)
        {
            ThisAsCollection().Remove(pair);
        }
        return remove.Count > 0;
    }

    public bool TryGetValue(TKey key, out TValue value)
    {
        value = default(TValue);
        var r = GetKvpByTheKey(key);
        if (!Equals(r, default(ObservableKeyValuePair<TKey, TValue>)))
        {
            return false;
        }
        value = r.Value;
        return true;
    }

    private ObservableKeyValuePair<TKey, TValue> GetKvpByTheKey(TKey key)
    {
        return ThisAsCollection().FirstOrDefault((i) => i.Key.Equals(key));
    }

    public ICollection<TValue> Values
    {
        get { return (from i in ThisAsCollection() select i.Value).ToList(); }
    }

    public TValue this[TKey key]
    {
        get
        {
            TValue result;
            if (!TryGetValue(key,out result))
            {
                throw new ArgumentException("Key not found");
            }
            return result;
        }
        set
        {
            if (ContainsKey(key))
            {
                GetKvpByTheKey(key).Value = value;
            }
            else
            {
                Add(key, value);
            }
        }
    }

    #endregion

    #region ICollection<KeyValuePair<TKey,TValue>> Members

    public void Add(KeyValuePair<TKey, TValue> item)
    {
        Add(item.Key, item.Value);
    }

    public bool Contains(KeyValuePair<TKey, TValue> item)
    {
        var r = GetKvpByTheKey(item.Key);
        if (Equals(r, default(ObservableKeyValuePair<TKey, TValue>)))
        {
            return false;
        }
        return Equals(r.Value, item.Value);
    }

    public void CopyTo(KeyValuePair<TKey, TValue>[] array, int arrayIndex)
    {
        throw new NotImplementedException();
    }

    public bool IsReadOnly
    {
        get { return false; }
    }

    public bool Remove(KeyValuePair<TKey, TValue> item)
    {
        var r = GetKvpByTheKey(item.Key);
        if (Equals(r, default(ObservableKeyValuePair<TKey, TValue>)))
        {
            return false;
        }
        if (!Equals(r.Value,item.Value))
        {
            return false ;
        }
        return ThisAsCollection().Remove(r);
    }

    #endregion

    #region IEnumerable<KeyValuePair<TKey,TValue>> Members

    public new IEnumerator<KeyValuePair<TKey, TValue>> GetEnumerator()
    {
        return (from i in ThisAsCollection() select new KeyValuePair<TKey, TValue>(i.Key, i.Value)).ToList().GetEnumerator();
    }

    #endregion
}

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