CODEWITHSUNDEEP
c#wpfwpfdatagrid
Steve
Steve

Reputation: 61

How to override automate creation of data grid column header?

since WPF creates column headers automatically based on which class is holding data, I'd like to ask if there is a possibility to override this process?

For example, having this class

public class Report
{
    public string Value { get; set; }
    public int Title { get; set; }
}

I will receive 2 columns - | Value | Title |

As I see it now, WPF creates those columns headers by getting the name of property and "pastes" plain output of what it gets

something like this?

nameof(property);

The goal I want to achieve is to create a custom attribute for the property like

[Header("Price in €")]
public string Value { get; set}

and let WPF create column header based on that attribute, so my columns would be like this -

| Price in € | Title |

My question is how to override this?

Upvotes: 2

Views: 114

Answers (1)

dymanoid
dymanoid

Reputation: 15197

You can create a simple Behavior for that.

I will use the ComponentModel.DescriptionAttribute in this example, but you can of course use any custom attribute.

using System.ComponentModel;
using System.Windows.Interactivity;

class ExtendendHeadersBehavior : Behavior<DataGrid>
{
    protected override void OnAttached()
    {
        AssociatedObject.AutoGeneratingColumn += AssociatedObject_AutoGeneratingColumn;
    }

    protected override void OnDetaching()
    {
        AssociatedObject.AutoGeneratingColumn -= AssociatedObject_AutoGeneratingColumn;
    }

    private void AssociatedObject_AutoGeneratingColumn(object sender, DataGridAutoGeneratingColumnEventArgs e)
    {
        if (e.PropertyDescriptor is PropertyDescriptor desc)
        {
            string header = desc.Attributes.OfType<DescriptionAttribute>()
                .FirstOrDefault()?.Description;

            if (!string.IsNullOrEmpty(header))
            {
                e.Column.Header = header;
            }
        }      
    }
}

Usage:

<DataGrid>
    <i:Interaction.Behaviors>
        <b:ExtendendHeadersBehavior/>
    </i:Interaction.Behaviors>
</DataGrid>

The namespaces are:

xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
xmlns:b="clr-namespace:YourAppNamespace"

Upvotes: 2

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