Question

里面的参数fileName，内存文件所处的路径，这个是什么意思呢？我在二次开发中还没接触过这个概念。

Answer 1

您好，要使用该功能，首先要使用TransportationAnalyst.CreateModel 方法，创建一个内存网络模型文件，该文件格式为snm，然后再使用LoadModel方法加载该内存网络模型文件。其中路径为文件所在的路径。

Comments

您好，CreateModel方法的参数是随便指定一个地址，然后就会生成一个内存网络模型文件吗，为什么我的报错说“参数不允许为null”呢

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该接口需要在load（）方法之后使用，范例代码如下：

 string name = @"G:\Download\Scala学习\SMO_DotNET_811_14428_59859_CHS_Zip\SampleData\City\Changchun.smwu";
                WorkspaceConnectionInfo workspaceConnectionInfo = new WorkspaceConnectionInfo(name);
                workspace = new Workspace();
                workspace.Open(workspaceConnectionInfo);

                DatasetVector dataset = workspace.Datasources[0].Datasets["RoadNet"] as DatasetVector;
                
                TransportationAnalystSetting setting = new TransportationAnalystSetting();
                setting.NetworkDataset = dataset;
                setting.EdgeIDField = "SmEdgeID";
                setting.NodeIDField = "SmNodeID";
                setting.EdgeNameField = "RoadName";

                WeightFieldInfos weightFieldInfos = new WeightFieldInfos();
                WeightFieldInfo weightfieldinfo = new WeightFieldInfo();
                weightfieldinfo.FTWeightField = "SmLength";
                weightfieldinfo.TFWeightField = "SmLength";
                weightfieldinfo.Name = "Length";
                weightFieldInfos.Add(weightfieldinfo);
                setting.FNodeIDField = "SmFNode";
                setting.TNodeIDField = "SmTNode";

                TransportationAnalyst m_analyst = new TransportationAnalyst();
                m_analyst.AnalystSetting = setting;
                m_analyst.Load();
                string file = @"C:\Users\Administrator\Desktop\test.snm";
                m_analyst.CreateModel(file);

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你好，请问我在执行了以上代码后，调用LoadModel方法，报错说未处理ArgumentException（参数为fileName），这是怎么回事呢，我指定的地址那儿确实已经创建好了一个snm文件的

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这就不清楚了，如果你完全按照我的示范代码执行，肯定是没有这个问题的，异常捕获到是参数fileName，那么你就看看哪些地方用到了这个参数，该参数的指向的路径，格式对不对。