DataColumnPropertyDescriptor.cs

Go to the documentation of this file.

using System.Collections;
using System.ComponentModel;
using System.Data.Common;
using System.Diagnostics.CodeAnalysis;
 
namespace System.Data;
 
internal sealed class DataColumnPropertyDescriptor : PropertyDescriptor
{
    public override AttributeCollection Attributes
    {
        get
        {
            if (typeof(IList).IsAssignableFrom(PropertyType))
            {
                Attribute[] array = new Attribute[base.Attributes.Count + 1];
                base.Attributes.CopyTo(array, 0);
                array[^1] = new ListBindableAttribute(listBindable: false);
                return new AttributeCollection(array);
            }
            return base.Attributes;
        }
    }
 
    internal DataColumn Column { get; }
 
    public override Type ComponentType => typeof(DataRowView);
 
    public override bool IsReadOnly => Column.ReadOnly;
 
    public override Type PropertyType => Column.DataType;
 
    public override bool IsBrowsable
    {
        get
        {
            if (Column.ColumnMapping != MappingType.Hidden)
            {
                return base.IsBrowsable;
            }
            return false;
        }
    }
 
    internal DataColumnPropertyDescriptor(DataColumn dataColumn)
        : base(dataColumn.ColumnName, null)
    {
        Column = dataColumn;
    }
 
    public override bool Equals([NotNullWhen(true)] object other)
    {
        if (other is DataColumnPropertyDescriptor)
        {
            DataColumnPropertyDescriptor dataColumnPropertyDescriptor = (DataColumnPropertyDescriptor)other;
            return dataColumnPropertyDescriptor.Column == Column;
        }
        return false;
    }
 
    public override int GetHashCode()
    {
        return Column.GetHashCode();
    }
 
    public override bool CanResetValue(object component)
    {
        DataRowView dataRowView = (DataRowView)component;
        if (!Column.IsSqlType)
        {
            return dataRowView.GetColumnValue(Column) != DBNull.Value;
        }
        return !DataStorage.IsObjectNull(dataRowView.GetColumnValue(Column));
    }
 
    public override object GetValue(object component)
    {
        DataRowView dataRowView = (DataRowView)component;
        return dataRowView.GetColumnValue(Column);
    }
 
    public override void ResetValue(object component)
    {
        DataRowView dataRowView = (DataRowView)component;
        dataRowView.SetColumnValue(Column, DBNull.Value);
    }
 
    public override void SetValue(object component, object value)
    {
        DataRowView dataRowView = (DataRowView)component;
        dataRowView.SetColumnValue(Column, value);
        OnValueChanged(component, EventArgs.Empty);
    }
 
    public override bool ShouldSerializeValue(object component)
    {
        return false;
    }
}