如何使用 C# 和 WPF DataGrid 以编程方式创建 N 个列

Question

I need to create N columns in WPF DataGrid where each column's header = "i" (i = 1..N) and then to add items to each column. I got a problem when tried to implement it:

for (int i = 0; i < N; i++)
{
    var col = new DataGridTextColumn();
    col.Header = i.ToString();
    col.Binding = new Binding(i.ToString());
    dataGrid.Columns.Add(col);
    dataGrid.Items.Add(new { i = "some txt" });
}

The problem may be at the line dataGrid.Items.Add(new { i = "some txt" }); to which I don't know how to fix it. At this line of code IDE tells i is an anonymous type, i is a number and not a property.

How can I add items to a column in this case?

Answer 1

You can create a DataTable and add your columns to the DataTable. Then set that DataTable as the data source of your data grid view.

DataTable dt = new DataTable();

for(int i = 0; i < numberOfRows; i++){
    DataRow row = dt.NewRow();
    for(int c = 0; c < numberOfColumns; c++){
        row[c] = "Your data here"       
    }
    dt.Rows.Add(row);
}

 MyDataGrid1.DataSource = dt;

Answer 2

Binding to index should have format: [index] . Also you should add items after you created columns:

for (int i = 0; i < N; i++)
{
    var col = new DataGridTextColumn
    {
        Header = i.ToString(),
        Binding = new Binding("[" + i + "]"),
        IsReadOnly = true,
        Width = new DataGridLength(1, DataGridLengthUnitType.Star)
    };

    dataGrid.Columns.Add(col);
}

var rowData = Enumerable.Range(0, N).ToList();
dataGrid.Items.Add(rowData);

Answer 3

Although I was able to build your demo similarly (using VS2017), I don't see it as practical as it does not show anything as no binding source of a specific type you are trying to set your binding context to.

Instead, here is something you might find useful. If you have a collection (List, ObservableCollection, etc.) that you are querying or otherwise populating, and you want that to automatically build, you can do with reflection. So example, I have a custom class

public class MySamplePerson
{
   public string FirstName {get; set;}
   public string LastName {get; set;}
   public int Age {get; set;}
}

Then, in your method you prepare a list of these things

private void PrepareYourGrid()
{
   // build a sample list of the data and I'm populating with 3 entries
   var SampleData = new List<MySamplePerson>();
   SampleData.Add(new MySamplePerson{ FirstName = "Bill", LastName = "Board", Age = 62});
   SampleData.Add(new MySamplePerson{ FirstName = "Eileen", LastName = "Dover", Age = 32 });
   SampleData.Add(new MySamplePerson{ FirstName = "Ben", LastName = "Dover", Age = 33});


   // using reflection, I am taking the first instance within the list,
   // getting the type, and then getting a list of all the properties on that class.
   var pi = SampleData[0].GetType().GetProperties();
   // Now, for each property, go through and create a column
   foreach( var onePI in pi)
   {
      var col = new DataGridTextColumn();
      // header based on the property name and binding to that same column name,
      // not just some fixed "text" value you prove
      col.Header = onePI.Name;
      col.Binding = new Binding(onePI.Name);
      // now add the column to the grid
      MyDataGrid1.Columns.Add(col);
   }

   // Now I can set the ItemsSource for the grid to the list of records I created   
   MyDataGrid1.ItemsSource = SampleData;
}

In my sample, my form data grid was named "MyDataGrid1". Now if you run, the grid will show as many rows as you have and each of the public properties exposed too..