private static Expression <Func <JEntity, bool> > CreateWherePredicate <QEntity, QKey, JEntity>(ParameterExpression queryParameter, Expression <Func <QEntity, QKey> > queryKey, string joinPropertyName)
{
var queryPropertyInfo = ((PropertyInfo)((MemberExpression)queryKey.Body).Member);
var innerjoinCollectionParameter = Expression.Parameter(typeof(JEntity), "join");
var innerRightProperty = Expression.Property(innerjoinCollectionParameter, joinPropertyName); //Street
Expression bodyProperty = queryParameter;
MemberExpression tempProperty = (MemberExpression)queryKey.Body;
var listMemberNames = new List <string>();
while (tempProperty != null)
{
listMemberNames.Add(tempProperty.Member.Name);
tempProperty = tempProperty.Expression as MemberExpression;
}
foreach (var name in listMemberNames.AsEnumerable().Reverse())
{
bodyProperty = Expression.Property(bodyProperty, name);
}
Expression <Func <JEntity, bool> > wherePredicate = //j => i.Id == j.Id
Expression.Lambda <Func <JEntity, bool> >(
Expression.Equal(bodyProperty, UnaryExpression.Convert(innerRightProperty, queryPropertyInfo.PropertyType)),
new[] { innerjoinCollectionParameter } //j =>
);
return(wherePredicate);
}
