internal IMemberAccessor GetDisplayMember(Type entityType)
{
return(_displayCache.GetOrAdd(entityType, key =>
{
TypeAccessor typeAccessor = TypeAccessor.GetAccessor(entityType);
IMemberAccessor displayMember = null;
var displayAttribute = GetAttribute <DisplayColumnAttribute>(entityType);
// first try DisplayColumnAttribute property
if (displayAttribute != null)
{
displayMember = typeAccessor.FindProperty(displayAttribute.DisplayColumn);
}
if (displayMember != null)
{
return displayMember;
}
var properties = typeAccessor.GetProperties().ToList();
// try first string property
displayMember = properties.FirstOrDefault(m => m.MemberType == typeof(string));
if (displayMember != null)
{
return displayMember;
}
// try second property
return properties.Count > 1 ? properties[1] : null;
}));
}
/// <summary>
/// Searches for the property using a property expression.
/// </summary>
/// <typeparam name="T">The object type containing the property specified in the expression.</typeparam>
/// <param name="propertyExpression">The property expression (e.g. p => p.PropertyName)</param>
/// <returns>An <see cref="IMemberAccessor"/> instance for the property if found; otherwise <c>null</c>.</returns>
/// <exception cref="ArgumentNullException">Thrown if the <paramref name="propertyExpression"/> is null.</exception>
/// <exception cref="ArgumentException">Thrown when the expression is:<br/>
/// Not a <see cref="MemberExpression"/><br/>
/// The <see cref="MemberExpression"/> does not represent a property.<br/>
/// Or, the property is static.
/// </exception>
public static IMemberAccessor FindProperty <T>(Expression <Func <T> > propertyExpression)
{
if (propertyExpression == null)
{
throw new ArgumentNullException("propertyExpression");
}
TypeAccessor typeAccessor = TypeAccessor.GetAccessor(typeof(T));
return(typeAccessor.FindProperty <T>(propertyExpression));
}
