Edward Edward - 1 year ago 67
C# Question

Convert DataTable to nestead Class by linq

I have a nested class definition as below:

public class cars
public car[] carList { get; set; }
public class car
[XmlElement(ElementName = "manufacture")]
public string manufacture { get; set; }
[XmlElement(ElementName = "models")]
public models modelList { get; set; }
public class models
[XmlElement(ElementName = "model")]
public model[] modelList { get; set; }
public class model
[XmlElement(ElementName = "name")]
public string name { get; set; }
[XmlElement(ElementName = "color")]
public string color { get; set; }

I have a DataTable as below:

DataTable dt = new DataTable();

Object[] rows = {
new Object[]{"P1","405","1,6"},
new Object[]{"P1","406","1,7"},
new Object[]{"P2","407","1,8"},
new Object[]{"P2","408","1,9"}

I want to convert my data in DataTable to my class cars.
Any help would be appreciated.

For using suggestion, I need to change Rows.Add with below code, otherwise, I will only get object in result.

DataRow dr= dt.NewRow();
dr["Manufacture"] = "Peugeot1";
dr["ModelName"] = "405";
dr["Color"] = "1,6";
DataRow dr2 = dt.NewRow();
dr2["Manufacture"] = "Peugeot1";
dr2["ModelName"] = "406";
dr2["Color"] = "1,7";
DataRow dr3 = dt.NewRow();
dr3["Manufacture"] = "Peugeot2";
dr3["ModelName"] = "405";
dr3["Color"] = "1,6";

Answer Source

Use GroupBy to group all the rows by the Manufacture and then for each group project a new Car. To populate the ModelList property use a Select on the group:

var result = (from row in dt.AsEnumerable()
              group row by row.Field<string>("Manufacture") into grouping
              select new Car
                  Manufacture = grouping.Key,
                  ModelList = grouping.Select(item => new Model
                      Name = item.Field<string>("ModelName"),
                      Color = item.Field<string>("Color")

You can also use the method syntax with the GroupBy overload where you specify a selector predicate:

var result = dt.AsEnumerable()
               .GroupBy(row => row.Field<string>("Manufacture"),
                        row => new Model
                            Name = row.Field<string>("ModelName"),
                            Color = row.Field<string>("Color")
               .Select(group => new Car
                   Manufacture = group.Key,
                   ModelList = group.ToArray()

Note that I have change the classes and property names to match the C# naming conventions

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