问在运行时使用属性名称和类型查询IQueryable

EN

var cosmosClient = new DocumentClient(new Uri(cosmosDBEndpointUrl), cosmosDBAuthorizationKey);
var feedOptions = new FeedOptions { MaxItemCount = -1, EnableCrossPartitionQuery = true };
var objects = cosmosClient.CreateDocumentQuery<MyObject>(collectionLink, feedOptions).AsEnumerable();

if (!string.IsNullOrEmpty(searchQuery))
{         
    var predicate = PredicateBuilder.New<MyObject>(); 

    foreach (var fieldToSearch in fieldsToSearch)
    {
      predicate = predicate.Or(x => x.GetPropertyValue(fieldToSearch).CheckDateTime().ToString()
                                     .Contains(searchQuery, StringComparison.InvariantCultureIgnoreCase));
      objects = objects.Where(predicate);
    }
}

objects = objects.Skip(index)
                 .Take(pageSize);

return objects.ToList();

public static object GetPropertyValue(this object obj, string propertyName)
{
    foreach (var part in propertyName.Split('.'))
    {
        if (obj == null) { return null; }

        Type type = obj.GetType();
        PropertyInfo info = type.GetProperty(part, BindingFlags.IgnoreCase | BindingFlags.Public | BindingFlags.Instance);
        if (info == null) { return null; }

        obj = info.GetValue(obj, null);
    }
    return obj;
}