/// <summary>
/// Returns queryable wrapper for data
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="data"></param>
/// <returns></returns>
public static IQueryable <T> FromLocalList <T>(this DbContext context, IList <T> data, Type queryClass, ValuesInjectionMethod method)
{
if (MemoryJoinerInterceptor.IsInterceptionEnabled(
new[] { context }, out InterceptionOptions opts))
{
throw new InvalidOperationException(
"Only one data set can be applied to single DbContext before actuall DB request is done");
}
var propMapping = allowedMappingDict.GetOrAdd(queryClass, MappingHelper.GetPropertyMappings);
var entityMapping = MappingHelper.GetEntityMapping <T>(context, queryClass, propMapping);
var baseQuerySet = context.Set(queryClass);
if (data.Any())
{
PrepareInjection(entityMapping, data, context, queryClass, method);
var middleResult = selectMethod.MakeGenericMethod(queryClass, typeof(T))
.Invoke(null, new object[] { baseQuerySet, entityMapping.OutExpression });
var querySet = (IQueryable <T>)middleResult;
return(querySet);
}
else
{
var emptyQueryable = takeMethod.MakeGenericMethod(queryClass).Invoke(null, new object[] { baseQuerySet, 0 });
var middleResult = selectMethod.MakeGenericMethod(queryClass, typeof(T))
.Invoke(null, new object[] { emptyQueryable, entityMapping.OutExpression });
var querySet = (IQueryable <T>)middleResult;
return(querySet);
}
}
static void PrepareInjection <T>(
Mapping <T> mapping,
IList <T> data,
DbContext context,
Type queryClass,
ValuesInjectionMethod method)
{
var opts = new InterceptionOptions
{
QueryTableName = EFHelper.GetTableName(context, queryClass),
ColumnNames = mapping.UserProperties.Keys.ToArray(),
Data = data
.Select(x => mapping.UserProperties.ToDictionary(y => y.Key, y => y.Value(x)))
.ToList(),
ContextType = context.GetType(),
ValuesInjectMethod = (ValuesInjectionMethodInternal)method,
KeyColumnName = mapping.KeyColumnName
};
MemoryJoinerInterceptor.SetInterception(context, opts);
}
