如何在C＃WPF中向Datagrid添加行

Question

I have a problem with adding a row to a Datagrid in C# WPF.

I have made a Struct for the data:

public struct MyData
{
    public int id { set; get; }
    public string title { set; get; }
    public int jobint { set; get; }
    public DateTime lastrun { set; get; }
    public DateTime nextrun { set; get; }
}

and a method to add the data:

  private void Add_Data_Grid_Row(object sender, RoutedEventArgs e)
        {
            Button button = sender as Button;
            DockPanel panel = button.Parent as DockPanel;
            DataGrid usedDataGrid = panel.Children.OfType<DataGrid>().FirstOrDefault();

            usedDataGrid.Items.Add(new MyData { id = 11123, title = "King", jobint = 1993123, lastrun = DateTime.Today, nextrun = DateTime.Today  });

        }

Can you help me out somehow?

Answer 1

 //Use ObservableCollection
 public ObservableCollection<MyData> MySource {get;set;}

 //initialize once, eg. ctor
 this.MySource = new ObservableCollection<MyData>();

 //add items
 this.MySource.Add(new MyData { id = 11123, title = "King", jobint = 1993123, lastrun = DateTime.Today, nextrun = DateTime.Today});

 //set the itemssource
 usedDataGrid.ItemsSource = this.MySource;

or go the MVVM way and use Binding instead of codebehind and setting the itemssource if you dont set AutogenerateColumns to true you have to define your columns with bindings

 <DataGrid ItemsSource="{Binding MySource}" AutogenerateColumns="true"/>

Answer 2

        DataTable dt = new DataTable();

        DataColumn column;
        DataRow row;
        DataView view;

        row = new DataRow();
        dt.Rows.Add(row);
        column = new DataColumn();
        column.DataType = System.Type.GetType("System.Int32");
        column.ColumnName = "id";
        dt.Columns.Add(column);

        column = new DataColumn();
        column.DataType = Type.GetType("System.String");
        column.ColumnName = "item";
        dt.Columns.Add(column);

        for (int i = 0; i < 10; i++)
        {
            row = dt.NewRow();
            row["id"] = i;
            row["item"] = "item " + i.ToString();
            dt.Rows.Add(row);
        }

        view = new DataView(dt);
        dataView1.ItemsSource = view;

Where dataView1 = Name of your Datagrid.

Answer 3

如果将DataGrid绑定到数据源，则在DataGrid中添加/操作行的通常方法并不对控件本身起作用（仅显示绑定数据源的内容），而是尝试简单地添加/操作数据源本身的内容，例如，将新的结构项添加到struct集合中，然后DataGrid将立即反映出该新项。

Answer 4

You have to bind the DataGrid to an ObservableCollection. Now whenever you add a new item to the ObservableCollection, the DataGrid would get refreshed with latest changes.

Please take a look at this example: http://www.codeproject.com/Articles/42536/List-vs-ObservableCollection-vs-INotifyPropertyCha

Answer 5

Your Data Structure must be implement an enumeratic interface. For this feture you can add it into an ObservableCollection or any Class which implements IEnumerable (like lists but this not provide observablity but adds your data to list) so this provide you to basic WPF elements implementation Also you have to implement the INotifyPropertyChange interface for regarding model binded events operations if it is a necessaty for you.