AggregateGraphLookupOptions mongo GraphLookup集

Question

如何将选项设置为GraphLookup，现在设置选项我无法设置泛型类型。

  var options = new **AggregateGraphLookupOptions<BsonDocument, BsonDocument, BsonDocument>**
            {
                MaxDepth = 2,
            };

var ss1 = aggregate.GraphLookup(this.EntitiesCol, "To", "From", startField, "destinations", **options**);

在ss1之后，我将用于比赛和分组.

错误：

严重程度代码描述项目文件行抑制状态错误'IAggregateFluent.GraphLookup(IMongoCollection，FieldDefinition、FieldDefinition、AggregateExpressionDefinition、FieldDefinition、FieldDefinition、AggregateGraphLookupOptions)‘的类型参数不能从使用中推断。尝试显式指定类型参数。F:\ABC\eStepControl\eStepControl\EngineGit\dev\eStepControl.Engine\src\eStepControl.Infrastructure\Repositories\EdgesRepository.cs 684活动Abc.eStepControl.Infrastructure

Answer 1

使用AppendStage()方法添加graphLookup阶段，如下所示：

var graphLookupStage = new BsonDocument("$graphLookup",
                        new BsonDocument
                            {
                                    { "from", "someCollection" },
                                    { "startWith", "$reportsTo" },
                                    { "connectFromField", "reportsTo"},
                                    { "connectToField",  "name" },
                                    { "as", "reportingHierarchy" },
                                    { "maxDepth", 1 },
                                    { "depthField", "depthField" } //optional
                        });
var result = collection.Aggregate().AppendStage<BsonDocument>(graphLookupStage);