/// <summary>
/// Creates a function that gets the value of the specified field. The parameter of the
/// resulting function takes the object whose field value is to be accessed. If the
/// specified field is static, the parameter of the resulting function is ignored.
/// </summary>
/// <param name="field">The field to create the getter function for.</param>
/// <returns>A function that gets the field value.</returns>
public static Func <object, object> CreateGetter(this FieldInfo field)
{
if (field is null)
{
throw new ArgumentNullException(nameof(field));
}
var getter = new FieldGetter(field);
QueueUserWorkItem(getter, g => g.SetOptimizedFunc());
return(getter.GetValue);
}
/// <summary>
/// Creates a function that gets the value of the specified field. The parameter of the
/// resulting function takes the object whose field value is to be accessed. If the
/// specified field is static, the parameter of the resulting function is ignored.
/// </summary>
/// <typeparam name="TFieldType">
/// The return type of the resulting function. This type must be compatible with the
/// <see cref="FieldInfo.FieldType"/> of the <paramref name="field"/> parameter.
/// </typeparam>
/// <param name="field">The field to create the getter function for.</param>
/// <returns>A function that gets the field value.</returns>
public static Func <object, TFieldType> CreateGetter <TFieldType>(this FieldInfo field)
{
if (field is null)
{
throw new ArgumentNullException(nameof(field));
}
if (!typeof(TFieldType).IsAssignableFrom(field.FieldType))
{
throw new ArgumentException("TFieldType must be assignable from field.FieldType", nameof(field));
}
var getter = new FieldGetter <TFieldType>(field);
QueueUserWorkItem(getter, g => g.SetOptimizedFunc());
return(getter.GetValue);
}