public static IQueryable <T> OfStockKey <T>(this IQueryable <T> q, StockKeyBase stockKey) where T : class, IHasStockKey
{
if (q == null)
{
throw new ArgumentNullException(nameof(q));
}
if (stockKey == null)
{
throw new ArgumentNullException(nameof(stockKey));
}
var components = GetComponents();
string where = BuildWhereClause(components);
q = q.Where(where, components.Select(x => x.ComponentValue).ToArray());
return(q);
List <StockKeyComponent> GetComponents()
{
return(stockKey.GetType()
.GetProperties()
.Select(x => new StockKeyComponent(x.Name, x.GetValue(stockKey)))
.ToList());
}
}
private static StockKeyBase GetStockKey(this IHasStockKey hasStockKey, Type stockKeyType)
{
if (hasStockKey == null)
{
throw new ArgumentNullException(nameof(hasStockKey));
}
if (stockKeyType == null)
{
throw new ArgumentNullException(nameof(stockKeyType));
}
if (typeof(StockKeyBase).IsAssignableFrom(stockKeyType) == false)
{
throw new ArgumentException("应为 StockKey 的子类", nameof(stockKeyType));
}
var entityProps = hasStockKey.GetType()
.GetProperties(BindingFlags.Public | BindingFlags.Instance)
.ToArray();
List <object> values = new List <object>();
foreach (var keyParam in stockKeyType.GetConstructors()[0].GetParameters())
{
var entityProp = entityProps.SingleOrDefault(x => x.Name == keyParam.Name);
if (entityProp == null)
{
throw new InvalidOperationException($"未找到属性，类型【{hasStockKey.GetType()}】，名称【{keyParam.Name}】");
}
object value = entityProp.GetValue(hasStockKey);
values.Add(value);
}
StockKeyBase stockKey = (StockKeyBase)Activator.CreateInstance(stockKeyType, values.ToArray());
return(stockKey);
}
public string GetOutOrdering(StockKeyBase stockKey)
{
return(((DefaultStockKey)stockKey).Batch);
}
