Re: NET RIA & DataGrid Column Header

07-17-2009 1:29 PM |

Hi there,

I think I understand you - as I had the same problem. When you have a DataGrid that is not set to AutoGenerate the Columns, it does not get the Header from the DisplayAttribute. This is quite annoying. I solved the problem by creating my own DataGrid that inherits from System.Windows.Controls.DataGrid and add the following code. I then call FixColumns in the DataSource Loaded event: 

public class DataGrid : System.Windows.Controls.DataGrid
    {       
        protected Type GetEntityType(DomainDataSource ds)
        {
            if (ds != null && ds.DomainContext != null)
            {

// I know this is a total hack...
// Know a better way to get the entity attached to this DataGrid? Likely from the Binding
 
                Type dsType = ds.DomainContext.GetType();
                MethodInfo mi = dsType.GetMethod(ds.QueryName + "Query", new Type[0]);
                if (mi.ReturnType.IsGenericType)
                {
                    return mi.ReturnType.GetGenericArguments()[0];
                }
            }

            return null;
        }

        public void FixColumns(DomainDataSource ds)
        {
            Type type = GetEntityType(ds);

            if (type == null)
                return;

            foreach (DataGridColumn column in this.Columns)
            {
                FixColumn(column, type, false);
            }
        }
        protected bool FixColumn(DataGridColumn column, Type itype, bool isAutoGenerated)
        {
            DataGridBoundColumn bc = column as DataGridBoundColumn;
            
            if (bc != null)
            {
                PropertyInfo pi = itype.GetProperty(bc.Binding.Path.Path);
                if (pi == null)
                    return false;

                object[] disp = pi.GetCustomAttributes(typeof(DisplayAttribute), true);

                if (disp.Length > 0)
                {
                    DisplayAttribute dispattr = disp[0] as DisplayAttribute;

                    if (string.IsNullOrEmpty(bc.Header as string) && !string.IsNullOrEmpty(dispattr.Name))
                    {
                        bc.Header = dispattr.Name;
                    }
                }
            }

            return true;
        }
    }

Re: Re: NET RIA & DataGrid Column Header

11-03-2009 4:28 AM |

Below is the source DATAGRID Control, which allows to load Field Name Headers automatically from the model!

C# CODE OF DATAGRID CONTROL FOR GRABBING ALL HEADER NAMES:

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Reflection;
using System.Windows.Controls;
using System.Windows.Data;

namespace BusinessApplication1.Controls
{
    public class DataGrid : System.Windows.Controls.DataGrid
    {
        private bool IsFieldsHeaderGenerated = false;

        public DataGrid()
        {
            this.SelectionChanged += DataGrid_SelectionChanged;
        }

        void DataGrid_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            this.FixColumns(this.SelectedItem);
        }

        public void FixColumns(object record)
        {
            if (record != null)
            {
                if (!this.IsFieldsHeaderGenerated)
                {
                    foreach (DataGridColumn column in this.Columns)
                    {
                        this.FixColumn(column, record);
                    }
                    this.IsFieldsHeaderGenerated = true;
                }
            }
            else
            {
                this.IsFieldsHeaderGenerated = false;
            }
        }

        protected bool FixColumn(DataGridColumn column, object record)
        {

            // THIS CODE TAKEN FROM Silverlight Toolkit => DataForm => GenerateFields() AND NOT MUCH CHANGED

            PropertyInfo[] propertyInfos = record.GetType().GetProperties(BindingFlags.Public | BindingFlags.Instance);

            if (propertyInfos == null)
            {
                return false;
            }

            IDictionary<string, BindingMode> bindingModes = new Dictionary<string, BindingMode>();

            foreach (PropertyInfo propertyInfo in propertyInfos)
            {
                if (propertyInfo.GetIndexParameters().Length > 0)
                {
                    // Don't generate anything for indexed properties.
                    continue;
                }

                if (propertyInfo.Name == (column as DataGridTextColumn).Binding.Path.Path)
                {

                    DisplayAttribute displayAttribute =
                        propertyInfo.GetCustomAttributes(typeof(DisplayAttribute), true /* inherit */)
                        .Cast<DisplayAttribute>()
                        .FirstOrDefault();

                    bool propertyGenerated = false;

                    if (displayAttribute == null ||
                        !displayAttribute.GetAutoGenerateField().HasValue ||
                        displayAttribute.GetAutoGenerateField().Value == true)
                    {
                        if (propertyInfo.GetSetMethod() != null)
                        {
                            bindingModes.Add(propertyInfo.Name, BindingMode.TwoWay);
                        }
                        else
                        {
                            bindingModes.Add(propertyInfo.Name, BindingMode.OneWay);
                        }

                        propertyGenerated = true;
                    }

                    if (propertyGenerated)
                    {
                        if (displayAttribute != null)
                        {
                            #region GetFieldName

                            string name = displayAttribute.GetName();
                            if (string.IsNullOrEmpty(name))
                            {
                                name = displayAttribute.GetShortName();
                            }
                            if (!string.IsNullOrEmpty(name))
                            {
                                column.Header = name;
                            }

                            #endregion
                        }
                    }

                    if(column.Header == null)
                    {
                        column.Header = propertyInfo.Name;
                    }
                }
            }

            return true;
        }
    }
}

XAML CODE FOR USING:

xmlns:appControls="clr-namespace:BusinessApplication1.Controls"
......

<appControls:DataGrid x:Name="dataGrid" ItemsSource="{Binding ElementName=dds, Path=Data}" AutoGenerateColumns="False">
    <appControls:DataGrid.Columns>
         <!-- THIS COLUMNS JUST FOR SAMPLE -->
         <data:DataGridTextColumn Binding="{Binding CustomerID}"/>
         <data:DataGridTextColumn Binding="{Binding ContactName}"/>
         <data:DataGridTextColumn Binding="{Binding ContactTitle}"/>
         <data:DataGridTextColumn Binding="{Binding CompanyName}"/>
         <data:DataGridTextColumn Binding="{Binding Country}"/>
         <data:DataGridTextColumn Binding="{Binding Region}"/>
         <data:DataGridTextColumn Binding="{Binding City}"/>
         <data:DataGridTextColumn Binding="{Binding Address}"/>
         <data:DataGridTextColumn Binding="{Binding PostalCode}"/>
         <data:DataGridTextColumn Binding="{Binding Phone}"/>
         <data:DataGridTextColumn Binding="{Binding Fax}"/>
    </appControls:DataGrid.Columns>
</appControls:DataGrid>
 

Do not forget to write the attribute Display(Name = "YOUR_FIELD_NAME") on the field this model class file YOUR_DomainService.metadata.cs

Sample how to using

Enjoy and be Happy :)