Question

这是

的延续

OnEvent datagrid column add fail

我看过这篇文章：

How to add Data to a WPF datagrid programatically

datagrid就是这样：

<DataGrid Name="dtgResults" Background="Transparent" AutoGenerateColumns="False"/>

其中一切似乎都运行良好，但当我把它放在我的解决方案中时，它不会编译：

任何人都可以解释我为什么吗？

--- --- EDIT

我现在意识到我误解了上面链接中的内容。简而言之，我有一个绑定到可观察集合的数据网格。我还要添加两列。怎么办？

--- EDIT2 ---- for CBreeze

 dtgResults.ItemsSource = obcmMyDim;<--------previous data here
 DataGridTextColumn textColumn1 = new DataGridTextColumn();
 textColumn1.Header = "AAA1";
 textColumn1.Binding = new Binding("AAA1");

 DataGridTextColumn textColumn2 = new DataGridTextColumn();
 textColumn2.Header = "AAA2";
 textColumn2.Binding = new Binding("AAA2");

 Application.Current.Dispatcher.BeginInvoke(new ThreadStart(() => dtgResults.Columns.Add(textColumn1)));
 Application.Current.Dispatcher.BeginInvoke(new ThreadStart(() => dtgResults.Columns.Add(textColumn2)));

 dtgResults.Items.Add(new { AAA1 = "Col1Row1", AAA2 = "Col2Row1"});
 dtgResults.Items.Add(new { AAA1 = "Col1Row2", AAA2 = "Col2Row2" });

---编辑3 ---为JH 所以简而言之，我有一个可观察的集合绑定到datagrid，产生以下输出：

然后我用你的方法添加列：

var names = obcmMyDim.First().obcItemsName; // All entries must have the same list of obcItemsName and in the same order
    for (int i = 0; i < names.Count; i++)
    {
      DataGridTextColumn c = new DataGridTextColumn();
      c.Header = names[i];

      var b = new Binding();
      string str = string.Format("obcmMyDim.obcItemsMeasured[{0}]", i);
      b.Path = new PropertyPath(str);
      b.Mode = BindingMode.TwoWay;

      c.Binding = b;

      dtgResults.Columns.Add(c);
    }

至于绑定数组

并且绑定str是“obcmMyDim.obcItemsMeasured [0]”... 1 .... n

但我得到的是列在那里，但它们是空的

Answer 1

你尝试过类似的东西吗？

dtgResults.Columns.Add(new DataGridTextColumn { Header = "a.1"});
dtgResults.Columns.Add(new DataGridTextColumn { Header = "a.2"});

修改

for (int i = 1; i <= 10; i++) { dtgResults.Items.Add(new { a.1 = "Test" + i, a.2 = "Test" + i}); }

Answer 2

由于您使用ItemCollection，因此无法进行编译。我认为你没有创建自己的类，就像从链接回答并使用System.Windows.Controls.ItemCollection一样，在这种情况下不能使用。

Answer 3

您可以绑定到数组中的项目，但您必须确保所有数组都相同（相同的字段，顺序相同，以便它们的索引一致）。以下是基于您遇到的其他问题的示例。

请注意，必须将字段obcItemsMeasured更改为属性，因为绑定需要属性（而不是字段）。

XAML：

<Window x:Class="WpfApplication2.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApplication2"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <DataGrid x:Name="dtgResults" CanUserAddRows="False" AutoGenerateColumns="False">
        <DataGrid.Columns>
            <DataGridTextColumn Binding="{Binding NameAxisDimension}" Header="NameAxisDimension" />
            <DataGridTextColumn Binding="{Binding Nominal}" Header="Nominal" />
            <DataGridTextColumn Binding="{Binding UpperTolerance}" Header="UpperTolerance" />
            <DataGridTextColumn Binding="{Binding LowerTolerance}" Header="LowerTolerance" />
        </DataGrid.Columns>
    </DataGrid>
</Window>

代码：

using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;

namespace WpfApplication2
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            // Build list of MyDimensions manually (since I don't have access to your data)
            var obcmMyDim = new ObservableCollection<MyDimension>(CreateData());
            dtgResults.ItemsSource = obcmMyDim;

            var names = obcmMyDim.First().obcItemsName; // All entries must have the same list of obcItemsName and in the same order
            for (int i=0; i<names.Count; i++)
            {
                DataGridTextColumn c = new DataGridTextColumn();
                c.Header = names[i];

                var b = new Binding();
                b.Path = new PropertyPath(string.Format("obcItemsMeasured[{0}]", i)); // Binding is based on index into array, thats why all entries have to have the same dynamic fields
                b.Mode = BindingMode.TwoWay;

                c.Binding = b;

                dtgResults.Columns.Add(c);
            }

        }
        public IList<MyDimension> CreateData()
        {
            List<MyDimension> Dimensions = new List<MyDimension>();
            string[] names = new string[] { "PART11", "PART20" }; // They must all have the same obcItemsName/obcItemsMeasured entries, and in the same order
            Dimensions.Add(CreateItem("LOC1-X", names, 0, 0));
            Dimensions.Add(CreateItem("LOC1-Y", names, 0, 0));
            Dimensions.Add(CreateItem("LOC1-D", names, 10.0, 10.1));
            Dimensions.Add(CreateItem("LOC1-RN", names, 0, 0));
            Dimensions.Add(CreateItem("LOC2-X", names, 0, 0));
            Dimensions.Add(CreateItem("LOC2-Y", names, 0, 0));
            Dimensions.Add(CreateItem("LOC1-DF", names, 10.2, 10.3));
            Dimensions.Add(CreateItem("LOC2-TP", names, 0, 0));
            Dimensions.Add(CreateItem("DIST1-M", names, 14.14214, 14.14215));
            Dimensions.Add(CreateItem("DIST2-M", names, 10.4, 10.5));
            // etc...
            return Dimensions;
        }
        public MyDimension CreateItem(string name, string[] names, params double[] values)
        {
            var d = new MyDimension();
            d.NameAxisDimension = name;
            for (int i = 0; i < names.Length; i++)
            {
                d.obcItemsName.Add(names[i]);
                d.obcItemsMeasured.Add(values[i]);
            }
            return d;
        }
    }
    public class MyDimension
    {
        public MyDimension()
        {
            obcItemsName = new ObservableCollection<string>();
            obcItemsMeasured = new ObservableCollection<double>();
        }
        public string NameAxisDimension { get; set; }
        public double Nominal { get; set; }
        public double UpperTolerance { get; set; }
        public double LowerTolerance { get; set; }
        public ObservableCollection<string> obcItemsName;
        public ObservableCollection<double> obcItemsMeasured { get; set; } // Has to be a property since it is used in the binding
    }
}

截图：

以编程方式将列添加到datagrid而不编译

3 个答案: