/// <summary>
/// Gets the attribute value.
/// </summary>
/// <param name="instance">The instance.</param>
/// <param name="propertyName">Name of the property.</param>
/// <returns>
/// The string value. Null if key does not exist
/// </returns>
public static string GetAttributeValue(this IAttributeContainer instance, [CallerMemberName] string propertyName = null)
{
var attributeName = instance.GetAttributeNameFor(propertyName);
if (instance.ContainsAttributeFor(propertyName) == false)
{
return(null);
}
return(instance.Attributes[attributeName]);
}
/// <summary>
/// Sets the attribute value.
/// </summary>
/// <param name="instance">The instance.</param>
/// <param name="value">The value.</param>
/// <param name="propertyName">Name of the property.</param>
/// <returns>
/// Sets the string value for the given property
/// </returns>
public static bool SetAttributeValue(this IAttributeContainer instance, string value, [CallerMemberName] string propertyName = null)
{
var attributeName = instance.GetAttributeNameFor(propertyName);
var currentValue = instance.GetAttributeValue(propertyName);
if (currentValue != null && value == null)
{
instance.Attributes.Remove(attributeName);
instance.NotifyAttributeChangedFor(propertyName);
return(true);
}
if (Equals(currentValue, value))
{
return(false);
}
instance.Attributes[attributeName] = value;
instance.NotifyAttributeChangedFor(propertyName);
return(true);
}
/// <summary>
/// Determines whether [contains attribute for] [the specified property name].
/// </summary>
/// <param name="instance">The instance.</param>
/// <param name="propertyName">Name of the property.</param>
/// <returns>
/// <c>true</c> if [contains attribute for] [the specified property name]; otherwise, <c>false</c>.
/// </returns>
public static bool ContainsAttributeFor(this IAttributeContainer instance, [CallerMemberName] string propertyName = null)
{
var attributeName = instance.GetAttributeNameFor(propertyName);
return(instance.Attributes.ContainsKey(attributeName));
}