Question

我有以下类要使用，我想将内容导出/展平为csv文件。我尝试使用SelectMany，但找不到从Salesforce，Node和EthernetArea的公司级别和基础级别为我的csv文件选择字段的方法。有人可以解释我需要做些什么来实现这一目标吗？

public class Rootobject
{
    public Company[] Companies { get; set; }
}
public class Company
{
    public string ORG_NAME { get; set; }
    public SalesArea[] Salesareas { get; set; }
    public Node[] Nodes { get; set; }
    public EthernetArea[] Ethernetareas { get; set; }
}
public class SalesArea
{
    public string OBJ_NAME { get; set; }
    public string AREA_CTYPE { get; set; }
}
public class Node
{
    public string OBJ_NAME { get; set; }
    public object BUILDING { get; set; }
}
public class EthernetArea
{
    public string OBJ_NAME { get; set; }
    public string AREA_CTYPE { get; set; }
    public Product[] Products { get; set; }
}
public class Product
{
    public string BANDWIDTH_A { get; set; }
    public string CONNECTION_TYPE { get; set; }
}

Answer 1

我确定应该有另一种方法，但是无论如何，这就是我的方法...

如果我正确理解，您想对数据进行“非规范化”并将集合导出为CSV。

我使用了许多Select SelectMany和Join

var root = new Rootobject
    {
        Companies = new Company[] {
            new Company
        {
            ORG_NAME = "Co",
            Salesareas = new SalesArea[]{
            new SalesArea {
                OBJ_NAME = "Sa",
                AREA_CTYPE = "SaAr",
            }
        },
            Nodes = new Node[] {
            new Node {
                OBJ_NAME = "No",
                BUILDING = "NoBu"
            }
        },
            Ethernetareas = new EthernetArea[] {
            new EthernetArea {
                OBJ_NAME = "Et",
                AREA_CTYPE = "EtAr",
                Products = new Product[] {
                    new Product {
                        BANDWIDTH_A = "ProA",
                        CONNECTION_TYPE = "ProCon"
                    }
                }
            }
        }
        },
        new Company
        {
            ORG_NAME = "Co2",
            Salesareas = new SalesArea[]{
            new SalesArea {
                OBJ_NAME = "Sa2",
                AREA_CTYPE = "SaAr2",
            }
        },
            Nodes = new Node[] {
            new Node {
                OBJ_NAME = "No2",
                BUILDING = "NoBu2"
            }
        },
            Ethernetareas = new EthernetArea[] {
            new EthernetArea {
                OBJ_NAME = "Et2",
                AREA_CTYPE = "EtAr2",
                Products = new Product[] {
                    new Product {
                        BANDWIDTH_A = "ProA2",
                        CONNECTION_TYPE = "ProCon2"
                    },
                    new Product {
                        BANDWIDTH_A = "ProA3",
                        CONNECTION_TYPE = "ProCon3"
                    }
                }
            }
        }
        }
    }
    };

    var sas = root.Companies.SelectMany(x => x.Salesareas.Select(y => new { Company = x.ORG_NAME, SalesName = y.OBJ_NAME, SalesAreaType = y.AREA_CTYPE }));
    var nodes = root.Companies.SelectMany(x => x.Nodes.Select(y => new { Company = x.ORG_NAME, NodesName = y.OBJ_NAME, NodeBuilding = y.BUILDING }));
    var ethes = root.Companies.SelectMany(x => x.Ethernetareas.SelectMany(y => y.Products .Select(z => new { Company = x.ORG_NAME, EthernetName = y.OBJ_NAME, EthernetArea = y.AREA_CTYPE, BandwithA = z.BANDWIDTH_A, ConnnectionType = z.CONNECTION_TYPE })));

    sas.Join(nodes, x => x.Company, y => y.Company, (x, y) => new {x.Company, x.SalesName, x.SalesAreaType, y.NodesName, y.NodeBuilding})
        .Join(ethes, x => x.Company, y => y.Company, (x, y) => new {x.Company, x.SalesName, x.SalesAreaType, x.NodesName, x.NodeBuilding, y.EthernetName, y.EthernetArea, y.BandwithA, y.ConnnectionType})
        .Dump();

Dump()是LinqPad扩展方法

这是结果...

对于集合，您可以按照CsvHelper的建议使用@Drag And Drop来生成CSV文件。...：）

编辑

我刚刚意识到@Drag And Drop代码更直接，更干净，更好。...：）

Answer 2

定义一个类，该类将表示您想要在CSV中显示的内容。由于多个对象属性在模型中具有相同的名称。
在您的注释中，您选择为属性添加类名作为前缀，因此您应该具有以下内容：

public class CompanyCSV
{
    public string Company_ORG_NAME { get; set; }

    public string SalesArea_OBJ_NAME { get; set; }
    public string SalesArea_AREA_CTYPE { get; set; }

    public string Node_OBJ_NAME { get; set; }
    public string Node_BUILDING { get; set; }

    public string EthernetArea_OBJ_NAME { get; set; }
    public string EthernetArea_AREA_CTYPE { get; set; }

    public string Product_BANDWIDTH_A { get; set; }
    public string Product_CONNECTION_TYPE { get; set; }
}

然后简单地：

var result = from c in dataInput.Companies
                from s in c.Salesareas
                from n in c.Nodes
                from e in c.Ethernetareas
                from p in e.Products
                select new CompanyCSV
                {
                    Company_ORG_NAME = c.ORG_NAME,

                    SalesArea_OBJ_NAME = s.OBJ_NAME,
                    SalesArea_AREA_CTYPE = s.AREA_CTYPE,

                    Node_OBJ_NAME = n.OBJ_NAME,
                    Node_BUILDING = n.BUILDING.ToString(),

                    EthernetArea_OBJ_NAME = e.OBJ_NAME,
                    EthernetArea_AREA_CTYPE = e.AREA_CTYPE,

                    Product_BANDWIDTH_A = p.BANDWIDTH_A,
                    Product_CONNECTION_TYPE = p.CONNECTION_TYPE
                };


foreach (var line in result)
{ // Don't use this to generate your csv this is simply to show the result
    Console.WriteLine($"{line.c},{line.s},{line.n},{line.e},{line.p}, ..etc ..");
}

要编写CSV，可以使用CsvHelper。这将帮助您用逗号或引号处理值。请勿手动生成CSV。

如果您的集合（Node []，Company []等）可以为null，则应在吸气剂中使用null-coalescing operator来保护这种边缘情况，例如：

private Node[] nodes;
public Node[] Nodes {
    get { return nodes ?? (nodes = new Node[] { }); }
    set { nodes = value; }
}

将数据从嵌套的c＃类导出到csv文件

2 个答案:

编辑