如何正确地将对象绑定到WPF DataGrid？ [英] How to correctly bind an object to a WPF DataGrid?

问题描述

我正在尝试从正在构建的用户控件中获取WPF DataGrid。事情似乎一切正常。但是我在IDE的输出窗口中注意到了此消息：

I'm trying to get a WPF DataGrid to work from a user control I'm building. Things seems to work fine. But I noticed this message in the Output window in the IDE:

System.Windows.Data错误：39：BindingExpression路径错误： Name属性不正确在'object'``Object'（HashCode = 18165668）'上找到。 BindingExpression：Path =名称; DataItem =对象（HashCode = 18165668）；目标元素是 TextBlock（名称=）；目标属性为文本（类型为字符串）
System.Windows.Data错误：39：BindingExpression路径错误：在对象，对象（HashCode = 18165668）上找不到部门属性。 BindingExpression：Path =名称; DataItem =对象（HashCode = 18165668）；目标元素是 TextBlockComboBox（名称=）；目标属性是 SelectedItem（类型为字符串）

System.Windows.Data Error: 39 : BindingExpression path error: 'Name' property not found on 'object' ''Object' (HashCode=18165668)'. BindingExpression:Path=Name; DataItem='Object' (HashCode=18165668); target element is 'TextBlock' (Name=''); target property is 'Text' (type 'String') System.Windows.Data Error: 39 : BindingExpression path error: 'Department' property not found on 'object' ''Object' (HashCode=18165668)'. BindingExpression:Path=Name; DataItem='Object' (HashCode=18165668); target element is 'TextBlockComboBox' (Name=''); target property is 'SelectedItem' (type 'String')

我想要做的是从XAML手动向DataGrid添加列并将其绑定

What I'm trying to do is to manually add columns to DataGrid from XAML and bind them to an object that I have in the C# code.

这是我的XAML代码：

Here is my XAML code:

    <UserControl x:Class="Sting.Utilities.MyDataGrid" Name="This"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:toolkit="http://schemas.microsoft.com/wpf/2008/toolkit"
        Height="600" Width="800">
        <Grid>
            <toolkit:DataGrid AutoGenerateColumns="False" Name="myDataGrid" Margin="10" ItemsSource="{Binding ElementName=This, Path=MyData}">
                <toolkit:DataGrid.Columns>
                    <toolkit:DataGridTextColumn Header="Name" Binding="{Binding Name}"/>
                    <toolkit:DataGridComboBoxColumn Header="Department" x:Name="_Departmens" SelectedItemBinding="{Binding Department}"/>
                </toolkit:DataGrid.Columns>
            </toolkit:DataGrid>
        </Grid>
    </UserControl>

这是我的C＃代码：

    namespace Sting.Utilities
    {
        /// 
        /// Interaction logic for UserControl1.xaml
        /// 
        public partial class MyDataGrid : UserControl
        {
            DataTable _myData;
            public DataTable TestData { get { return _testData; } }

            public MyDataGrid()
            {
                // Initialize data table
                _myData = new DataTable();
                _testData.Columns.Add(new DataColumn("Name", typeof(string)));
                _testData.Columns.Add(new DataColumn("Department", typeof(string)));

                // Temp Code: User should add rows
                DataRow row = _testData.NewRow();
                row["Name"] = "John Smith";
                row["Department"] = "Accounting";
                _testData.Rows.Add(row);

                // Initialize combo boxes
                List departmentComboBoxList = new List() {"Accounting", "Purchasing", "Engineering"};
                _Departments.ItemsSource = departmentComboBoxList;
            }
        }
    }

任何想法都值得赞赏。谢谢。

Any thoughts are appreciated. Thank you.

推荐答案

是否显示新商品占位符行？因为如果是的话，那就是导致输出绑定错误的一个。

Is the 'New item placeholder' row shown? Because if it is, that's the one causing the output binding error.

占位符项目的数据上下文是一个空对象-自然不具有另一个对象的属性

The datacontext for a placeholder item is an empty object - which naturally does not have the properties of the other rows.

所以，一切都很好-如果多次收到同一条消息（每行一个，然后一个占位符），您就会遇到麻烦。

So, all is good - you are in trouble if you get the same message more than once (one per row and then one for the placeholder) :).

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