次のように宣言されたクラスがいくつかあります。
public class UserSpend
{
public string UserName{ get; set; }
public MonthSpend[] Spend { get; set; }
}
public class MonthSpend
{
public DateTime Month { get; set; }
public SpendDetail[] Detail { get; set; }
}
public class SpendDetail
{
public string Description { get; set; }
public decimal Amount { get; set; }
}
ご覧のとおり、いくつかのレベルがあります。次のような変数を宣言しました。
UserSpend[] allSpend;
いくつかの UserSpend があり、それぞれが複数の MonthSpend を持ち、それぞれが複数の SpendDetail を持つようにします。したがって、データは次のようになります。
allSpend =
UserSpend (UserName = "Bob", Spend = [
MonthSpend (Month = "01/09/12", Detail = [
SpendDetail (Description = "Local", Amount = "12.00"),
SpendDetail (Description = "National", Amount = "7.00") ]
MonthSpend (Month = "01/10/12", Detail = [
SpendDetail (Description = "Local", Amount = "8.00"),
SpendDetail (Description = "Mobile", Amount = "3.00"),
SpendDetail (Description = "National", Amount = "15.00") ]
MonthSpend (Month = "01/11/12", Detail = [
SpendDetail (Description = "Local", Amount = "16.00"),
SpendDetail (Description = "National", Amount = "5.00") ] ]
UserSpend (UserName = "Jack", Spend = [
MonthSpend (Month = "01/09/12", Detail = [
SpendDetail (Description = "Local", Amount = "1.00"),
SpendDetail (Description = "National", Amount = "4.00"),
SpendDetail (Description = "International", Amount = "17.00") ]
MonthSpend (Month = "01/10/12", Detail = [
SpendDetail (Description = "Local", Amount = "2.00"),
SpendDetail (Description = "Mobile", Amount = "7.00"),
SpendDetail (Description = "International", Amount = "5.00") ]
MonthSpend (Month = "01/11/12", Detail = [
SpendDetail (Description = "Local", Amount = "6.00"),
SpendDetail (Description = "National", Amount = "2.00") ] ]
私がやりたいのは、この変数を設定することです:
public class UserDataPoint
{
public string User { get; set; }
public string Category { get; set; }
public int Spend { get; set; }
}
UserDataPoint[] userData;
userData には次のようなものが含まれます。
userData = UserDataPoint (
[User = "Bob", Category = "Local", Spend = 36.00]
[User = "Bob", Category = "Mobile", Spend = 3.00]
[User = "Bob", Category = "National", Spend = 27.00]
[User = "Jack", Category = "Local", Spend = 9.00]
[User = "Jack", Category = "Mobile", Spend = 6.00]
[User = "Jack", Category = "National", Spend = 7.00]
[User = "Jack", Category = "International", Spend = 22.00]
したがって、UserName ごとに、Description でグループ化し、Amount を合計したいと思います。私はLINQを学ぼうとしており、これを達成するためにGroupByを使用しようとしていますが、どこにも行きません. 誰かがこれを達成する方法の例を提供してください。どうもありがとう、コリン。