C# 如何在WPF中设置自定义DataGridBind列的值

因为无法将值粘贴到DataGridTemplateColumn中。我发现了一些关于创建自己的从DataGridBoundColumn派生的column类的建议。下面的示例在不使用模板的情况下向列添加日期选择器

但是，这个示例不允许我使用DatePicker手动设置值，我不知道为什么。我在想是装订有问题。它将加载我最初绑定到它的日期值，这样它就完成了一半

有趣的是，使用其他一些助手类，我也可以粘贴日期，这正是最初的目的。我只是不想破坏任何东西。：-）

有没有办法让datepicker选择的值正确绑定

class MyDateColumn : DataGridBoundColumn 
{
    public string DateFormat { get; set; }
    protected override void CancelCellEdit(FrameworkElement editingElement, object uneditedValue)
    {
        DatePicker dp = editingElement as DatePicker;
        if (dp != null)
        {
            dp.SelectedDate = DateTime.Parse(uneditedValue.ToString());
        }
    }
    protected override FrameworkElement GenerateEditingElement(DataGridCell cell, object dataItem)
    {
        DatePicker dp = new DatePicker();
        Binding b = new Binding();
        Binding bb = this.Binding as Binding;
        b.Path = bb.Path;
        b.Source = DatePicker.SelectedDateProperty;
        if (DateFormat != null)
        {
            DateTimeConverter dtc = new DateTimeConverter();
            b.Converter = dtc;
            b.ConverterParameter = DateFormat;
        }
        dp.SetBinding(DatePicker.SelectedDateProperty, this.Binding);

        return dp;
    }

    protected override FrameworkElement GenerateElement(DataGridCell cell, object dataItem)
    {
        TextBlock txt = new TextBlock();
        Binding b = new Binding();
        Binding bb = this.Binding as Binding;
        b.Path = bb.Path;
        b.Source = cell.DataContext;

        if (DateFormat != null)
        {
            DateTimeConverter dtc = new DateTimeConverter();
            b.Converter = dtc;
            b.ConverterParameter = DateFormat;
        }
        txt.SetBinding(TextBlock.TextProperty, this.Binding);
        return txt;
    }

    protected override object PrepareCellForEdit(FrameworkElement editingElement, RoutedEventArgs editingEventArgs)
    {
        DatePicker dp = editingElement as DatePicker;
        if (dp != null)
        {
            DateTime? dt = dp.SelectedDate;
            if (dt.HasValue)
                return dt.Value;
        }
        return DateTime.Today;
    }

    protected override bool CommitCellEdit(FrameworkElement editingElement)
    {
        DatePicker dp = editingElement as DatePicker;
        dp.SelectedDate = DateTime.Today.AddYears(1);

        return true;
        //return base.CommitCellEdit(editingElement);
    }
}

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解决方案是对CommitCellEdit（）的修改

原始代码和帮助来自以下链接

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感谢创建示例和帮助Lee

我找到了一种更简单、更通用的解决方法。我没有为每个模板列创建自定义列，而是创建了一个从DataGridTemplateColumn继承的自定义列。这将解决您想要拥有的所有模板的问题。自定义列具有其他BindingPath属性，您可以在其中指定要使用粘贴的数据更新绑定对象上的哪个属性。显然，绑定对象需要实现INotifyPropertyChanged接口。更新源后，控件将自动更新

以下是自定义列代码：

using System.Reflection;
using Microsoft.Windows.Controls;

namespace Bartosz.Wojtowicz.Wpf
{
    public class PastableDataGridTemplateColumn : DataGridTemplateColumn
    {
        public string BindingPath { get; set; }

        public override void OnPastingCellClipboardContent(object item, object cellContent)
        {
            if (item != null)
            {
                PropertyInfo propertyInfo = item.GetType().GetProperty(BindingPath);
                if (propertyInfo != null)
                {
                    propertyInfo.SetValue(item, cellContent, null);
                }
            }
        }
    }
}

下面是如何在xaml中使用它：

 <local:PastableDataGridTemplateColumn Header="Value" BindingPath="ValueView" ClipboardContentBinding="{Binding ValueView}" >
  <local:PastableDataGridTemplateColumn.CellTemplate >
    <DataTemplate>
      <!-- your template ... -->
    </DataTemplate>
  </local:PastableDataGridTemplateColumn.CellTemplate>
  <local:PastableDataGridTemplateColumn.CellEditingTemplate>
    <DataTemplate>
      <!-- your template ... -->
    </DataTemplate>
  </local:PastableDataGridTemplateColumn.CellEditingTemplate>
</local:PastableDataGridTemplateColumn>

 <local:PastableDataGridTemplateColumn Header="Value" BindingPath="ValueView" ClipboardContentBinding="{Binding ValueView}" >
  <local:PastableDataGridTemplateColumn.CellTemplate >
    <DataTemplate>
      <!-- your template ... -->
    </DataTemplate>
  </local:PastableDataGridTemplateColumn.CellTemplate>
  <local:PastableDataGridTemplateColumn.CellEditingTemplate>
    <DataTemplate>
      <!-- your template ... -->
    </DataTemplate>
  </local:PastableDataGridTemplateColumn.CellEditingTemplate>
</local:PastableDataGridTemplateColumn>