Mixing
Using LINQ to convert List to List
I have 2 classes which have some identical properties.
I stock into a list properties from 1st class, and after that, i want to take some needed properties and put them into a list of 2nd class type.
I've made cast sequence through C# and that runs OK, but i must do with LINQ. I tried to do something but without good results. Help me please with suggestions.
1st Class:
public class ServiceInfo {
private long _id;
public long ID {
get { return this._id; }
set { _id = value; }
}
private string _name;
public string Name {
get { return this._name; }
set { _name = value; }
}
private long _qty;
public long Quantity {
get { return this._qty; }
set { _qty = value; }
}
private double _amount;
public double Amount {
get { return this._amount; }
set { _amount = value; }
}
private string _currency;
public string Currency {
get { return this._currency; }
set { _currency = value; }
}
private DateTime? _date;
public DateTime? Date {
get { return this._date; }
set { _date = value; }
}
}
2nd Class:
class InvoiceWithEntryInfo {
private string currencyField;
private long IdField;
public long IdIWEI {
get { return this.IdField; }
set { IdIWEI = value; }
}
private string nameField;
public string NameIWEI {
get { return this.nameField; }
set { NameIWEI = value; }
}
private long qtyField;
public long QuantityIWEI {
get { return this.qtyField; }
set { QuantityIWEI = value; }
}
private double amountField;
public double AmountIWEI {
get { return this.amountField; }
set { AmountIWEI = value; }
}
private DateTime dateField;
public DateTime? DateIWEI {
get { return this.dateField; }
set { DateIWEI = value; }
}
public string OwnerIWEI {
get; set;
}
}
C# sample which runs OK:
...
var sil = new List<ServiceInfo>();
var iweil = new List<InvoiceWithEntryInfo>();
...
if (sil != null)
{
foreach (ServiceInfo item in sil)
{
iweil.Add(new InvoiceWithEntryInfo
{
IdIWEI = item.ID,
AmountIWEI = item.Amount,
DateIWEI = item.Date
});
}
LINQ sample wich doesnt run OK:
iweilCOPY = sil.ConvertAll<InvoiceWithEntryInfo>(a => (InvoiceWithEntryInfo)a);
iweilCOPY = sil.FindAll(a => (sil is InvoiceWithEntryInfo)).ConvertAll<InvoiceWithEntryInfo>(a => (InvoiceWithEntryInfo)a);
c# linq list .net-3.5 casting
asked Aug 16 '11 at 8:38
mihaimihai
1,46222246
add a comment |
I have 2 classes which have some identical properties.
I stock into a list properties from 1st class, and after that, i want to take some needed properties and put them into a list of 2nd class type.
I've made cast sequence through C# and that runs OK, but i must do with LINQ. I tried to do something but without good results. Help me please with suggestions.
1st Class:
public class ServiceInfo {
private long _id;
public long ID {
get { return this._id; }
set { _id = value; }
}
private string _name;
public string Name {
get { return this._name; }
set { _name = value; }
}
private long _qty;
public long Quantity {
get { return this._qty; }
set { _qty = value; }
}
private double _amount;
public double Amount {
get { return this._amount; }
set { _amount = value; }
}
private string _currency;
public string Currency {
get { return this._currency; }
set { _currency = value; }
}
private DateTime? _date;
public DateTime? Date {
get { return this._date; }
set { _date = value; }
}
}
2nd Class:
class InvoiceWithEntryInfo {
private string currencyField;
private long IdField;
public long IdIWEI {
get { return this.IdField; }
set { IdIWEI = value; }
}
private string nameField;
public string NameIWEI {
get { return this.nameField; }
set { NameIWEI = value; }
}
private long qtyField;
public long QuantityIWEI {
get { return this.qtyField; }
set { QuantityIWEI = value; }
}
private double amountField;
public double AmountIWEI {
get { return this.amountField; }
set { AmountIWEI = value; }
}
private DateTime dateField;
public DateTime? DateIWEI {
get { return this.dateField; }
set { DateIWEI = value; }
}
public string OwnerIWEI {
get; set;
}
}
C# sample which runs OK:
...
var sil = new List<ServiceInfo>();
var iweil = new List<InvoiceWithEntryInfo>();
...
if (sil != null)
{
foreach (ServiceInfo item in sil)
{
iweil.Add(new InvoiceWithEntryInfo
{
IdIWEI = item.ID,
AmountIWEI = item.Amount,
DateIWEI = item.Date
});
}
LINQ sample wich doesnt run OK:
iweilCOPY = sil.ConvertAll<InvoiceWithEntryInfo>(a => (InvoiceWithEntryInfo)a);
iweilCOPY = sil.FindAll(a => (sil is InvoiceWithEntryInfo)).ConvertAll<InvoiceWithEntryInfo>(a => (InvoiceWithEntryInfo)a);
c# linq list .net-3.5 casting
asked Aug 16 '11 at 8:38
mihaimihai
1,46222246
add a comment |
I have 2 classes which have some identical properties.
I stock into a list properties from 1st class, and after that, i want to take some needed properties and put them into a list of 2nd class type.
I've made cast sequence through C# and that runs OK, but i must do with LINQ. I tried to do something but without good results. Help me please with suggestions.
1st Class:
public class ServiceInfo {
private long _id;
public long ID {
get { return this._id; }
set { _id = value; }
}
private string _name;
public string Name {
get { return this._name; }
set { _name = value; }
}
private long _qty;
public long Quantity {
get { return this._qty; }
set { _qty = value; }
}
private double _amount;
public double Amount {
get { return this._amount; }
set { _amount = value; }
}
private string _currency;
public string Currency {
get { return this._currency; }
set { _currency = value; }
}
private DateTime? _date;
public DateTime? Date {
get { return this._date; }
set { _date = value; }
}
}
2nd Class:
class InvoiceWithEntryInfo {
private string currencyField;
private long IdField;
public long IdIWEI {
get { return this.IdField; }
set { IdIWEI = value; }
}
private string nameField;
public string NameIWEI {
get { return this.nameField; }
set { NameIWEI = value; }
}
private long qtyField;
public long QuantityIWEI {
get { return this.qtyField; }
set { QuantityIWEI = value; }
}
private double amountField;
public double AmountIWEI {
get { return this.amountField; }
set { AmountIWEI = value; }
}
private DateTime dateField;
public DateTime? DateIWEI {
get { return this.dateField; }
set { DateIWEI = value; }
}
public string OwnerIWEI {
get; set;
}
}
C# sample which runs OK:
...
var sil = new List<ServiceInfo>();
var iweil = new List<InvoiceWithEntryInfo>();
...
if (sil != null)
{
foreach (ServiceInfo item in sil)
{
iweil.Add(new InvoiceWithEntryInfo
{
IdIWEI = item.ID,
AmountIWEI = item.Amount,
DateIWEI = item.Date
});
}
LINQ sample wich doesnt run OK:
iweilCOPY = sil.ConvertAll<InvoiceWithEntryInfo>(a => (InvoiceWithEntryInfo)a);
iweilCOPY = sil.FindAll(a => (sil is InvoiceWithEntryInfo)).ConvertAll<InvoiceWithEntryInfo>(a => (InvoiceWithEntryInfo)a);
c# linq list .net-3.5 casting
asked Aug 16 '11 at 8:38
mihaimihai
1,46222246
I have 2 classes which have some identical properties.
I stock into a list properties from 1st class, and after that, i want to take some needed properties and put them into a list of 2nd class type.
I've made cast sequence through C# and that runs OK, but i must do with LINQ. I tried to do something but without good results. Help me please with suggestions.
1st Class:
public class ServiceInfo {
private long _id;
public long ID {
get { return this._id; }
set { _id = value; }
}
private string _name;
public string Name {
get { return this._name; }
set { _name = value; }
}
private long _qty;
public long Quantity {
get { return this._qty; }
set { _qty = value; }
}
private double _amount;
public double Amount {
get { return this._amount; }
set { _amount = value; }
}
private string _currency;
public string Currency {
get { return this._currency; }
set { _currency = value; }
}
private DateTime? _date;
public DateTime? Date {
get { return this._date; }
set { _date = value; }
}
}
2nd Class:
class InvoiceWithEntryInfo {
private string currencyField;
private long IdField;
public long IdIWEI {
get { return this.IdField; }
set { IdIWEI = value; }
}
private string nameField;
public string NameIWEI {
get { return this.nameField; }
set { NameIWEI = value; }
}
private long qtyField;
public long QuantityIWEI {
get { return this.qtyField; }
set { QuantityIWEI = value; }
}
private double amountField;
public double AmountIWEI {
get { return this.amountField; }
set { AmountIWEI = value; }
}
private DateTime dateField;
public DateTime? DateIWEI {
get { return this.dateField; }
set { DateIWEI = value; }
}
public string OwnerIWEI {
get; set;
}
}
C# sample which runs OK:
...
var sil = new List<ServiceInfo>();
var iweil = new List<InvoiceWithEntryInfo>();
...
if (sil != null)
{
foreach (ServiceInfo item in sil)
{
iweil.Add(new InvoiceWithEntryInfo
{
IdIWEI = item.ID,
AmountIWEI = item.Amount,
DateIWEI = item.Date
});
}
LINQ sample wich doesnt run OK:
iweilCOPY = sil.ConvertAll<InvoiceWithEntryInfo>(a => (InvoiceWithEntryInfo)a);
iweilCOPY = sil.FindAll(a => (sil is InvoiceWithEntryInfo)).ConvertAll<InvoiceWithEntryInfo>(a => (InvoiceWithEntryInfo)a);
c# linq list .net-3.5 casting
c# linq list .net-3.5 casting
asked Aug 16 '11 at 8:38
mihaimihai
1,46222246
asked Aug 16 '11 at 8:38
mihaimihai
1,46222246
edited Sep 3 '14 at 5:54
mihai
asked Aug 16 '11 at 8:38
mihaimihai
1,46222246
asked Aug 16 '11 at 8:38
mihaimihai
1,46222246
asked Aug 16 '11 at 8:38
mihaimihai
1,46222246
1,46222246
add a comment |
add a comment |
5 Answers
5
active
oldest
votes
var iweilCopy = sil.Select(item => new InvoiceWithEntryInfo()
{
IdWEI = item.Id,
NameWEI = item.Name,
....
}).ToList();
edited Apr 10 '13 at 7:07
edosoft
11.4k2371106
answered Aug 16 '11 at 8:45
vc 74vc 74
28.2k64875
add a comment |
var iweil = sil.Select(item=> new InvoiceWithEntryInfo {
IdIWEI = item.ID,
AmountIWEI = item.Amount,
DateIWEI = item.Date}).ToList();
edited Sep 11 '17 at 14:12
Diogo Cid
3,23311219
answered Aug 16 '11 at 8:43
Bob ValeBob Vale
15.8k2742
add a comment |
You need a function to convert a T instance to a U instance:
ResultType ConvertMethod(StartType input)
and you need to write this. Then
outputList = inputList.Select(ConvertMethod).ToList();
will apply it to the whole input collection. The conversion function can be a lambda written inline but doesn't need to be (if the function has the right signature, like ConvertMethod then the compiler will convert it correctly to pass to Select).
answered Aug 16 '11 at 8:45
RichardRichard
89.1k17152220
1
Could you provide some real example, pls? Your answer is the best one!
– Academy of Programmer
Jan 10 '14 at 12:32
List<int> numbers = new List<int>() { 1, 2, 3 }; Func<int, string> numToStringWithLPad = i => "Number: " + i; var numAsString = numbers.Select(numToStringWithLPad); numAsString.ToList().ForEach(i => Console.WriteLine(i)); Output: Number: 1 Number: 2 Number: 3
– Win Man
May 5 '17 at 23:19
add a comment |
Just use Select:
if(sil != null)
{
var iweil = sil.Select(item=>new InvoiceWithEntryInfo()
{
IdIWEI = item.ID,
AmountIWEI = item.Amount,
DateIWEI = item.Date
}).ToList();
}
answered Aug 16 '11 at 8:43
ForbesLindesayForbesLindesay
7,39623367
add a comment |
Your regular C# code and LINQ are not equivalent. In the regular C# you instantiate a new instance of the other class and initialize the properties, whereas you try to cast (well convert) from one to the other; however, since they are not in the same class hierarchy you can't cast, and as you haven't defined a conversion operator, you can't convert (using cast syntax) either.
You either have to define a conversion operator
public static explicit operator InvoiceWithEntryInfo(ServiceInfo item){
return new InvoiceWithEntryInfo {
IdIWEI = item.ID,
AmountIWEI = item.Amount,
DateIWEI = item.Date};
}
or a creation method using regular method signature. I'd suggest the latter since the former pretend to be something it's not. It's not a cast and I'd personally like to be able to see that the code creates a new instance based on some input.
edited Aug 16 '11 at 11:56
Clint
4,70511837
answered Aug 16 '11 at 9:00
Rune FSRune FS
18.3k64887
add a comment |
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5 Answers
5
active
oldest
votes
5 Answers
5
active
oldest
votes
active
oldest
votes
active
oldest
votes
var iweilCopy = sil.Select(item => new InvoiceWithEntryInfo()
{
IdWEI = item.Id,
NameWEI = item.Name,
....
}).ToList();
edited Apr 10 '13 at 7:07
edosoft
11.4k2371106
answered Aug 16 '11 at 8:45
vc 74vc 74
28.2k64875
add a comment |
var iweilCopy = sil.Select(item => new InvoiceWithEntryInfo()
{
IdWEI = item.Id,
NameWEI = item.Name,
....
}).ToList();
edited Apr 10 '13 at 7:07
edosoft
11.4k2371106
answered Aug 16 '11 at 8:45
vc 74vc 74
28.2k64875
add a comment |
var iweilCopy = sil.Select(item => new InvoiceWithEntryInfo()
{
IdWEI = item.Id,
NameWEI = item.Name,
....
}).ToList();
edited Apr 10 '13 at 7:07
edosoft
11.4k2371106
answered Aug 16 '11 at 8:45
vc 74vc 74
28.2k64875
var iweilCopy = sil.Select(item => new InvoiceWithEntryInfo()
{
IdWEI = item.Id,
NameWEI = item.Name,
....
}).ToList();
edited Apr 10 '13 at 7:07
edosoft
11.4k2371106
answered Aug 16 '11 at 8:45
vc 74vc 74
28.2k64875
edited Apr 10 '13 at 7:07
edosoft
11.4k2371106
edited Apr 10 '13 at 7:07
edosoft
11.4k2371106
edited Apr 10 '13 at 7:07
edosoft
11.4k2371106
11.4k2371106
answered Aug 16 '11 at 8:45
vc 74vc 74
28.2k64875
answered Aug 16 '11 at 8:45
vc 74vc 74
28.2k64875
answered Aug 16 '11 at 8:45
vc 74vc 74
28.2k64875
28.2k64875
add a comment |
add a comment |
var iweil = sil.Select(item=> new InvoiceWithEntryInfo {
IdIWEI = item.ID,
AmountIWEI = item.Amount,
DateIWEI = item.Date}).ToList();
edited Sep 11 '17 at 14:12
Diogo Cid
3,23311219
answered Aug 16 '11 at 8:43
Bob ValeBob Vale
15.8k2742
add a comment |
var iweil = sil.Select(item=> new InvoiceWithEntryInfo {
IdIWEI = item.ID,
AmountIWEI = item.Amount,
DateIWEI = item.Date}).ToList();
edited Sep 11 '17 at 14:12
Diogo Cid
3,23311219
answered Aug 16 '11 at 8:43
Bob ValeBob Vale
15.8k2742
add a comment |
var iweil = sil.Select(item=> new InvoiceWithEntryInfo {
IdIWEI = item.ID,
AmountIWEI = item.Amount,
DateIWEI = item.Date}).ToList();
edited Sep 11 '17 at 14:12
Diogo Cid
3,23311219
answered Aug 16 '11 at 8:43
Bob ValeBob Vale
15.8k2742
var iweil = sil.Select(item=> new InvoiceWithEntryInfo {
IdIWEI = item.ID,
AmountIWEI = item.Amount,
DateIWEI = item.Date}).ToList();
edited Sep 11 '17 at 14:12
Diogo Cid
3,23311219
answered Aug 16 '11 at 8:43
Bob ValeBob Vale
15.8k2742
edited Sep 11 '17 at 14:12
Diogo Cid
3,23311219
edited Sep 11 '17 at 14:12
Diogo Cid
3,23311219
edited Sep 11 '17 at 14:12
Diogo Cid
3,23311219
3,23311219
answered Aug 16 '11 at 8:43
Bob ValeBob Vale
15.8k2742
answered Aug 16 '11 at 8:43
Bob ValeBob Vale
15.8k2742
answered Aug 16 '11 at 8:43
Bob ValeBob Vale
15.8k2742
15.8k2742
add a comment |
add a comment |
You need a function to convert a T instance to a U instance:
ResultType ConvertMethod(StartType input)
and you need to write this. Then
outputList = inputList.Select(ConvertMethod).ToList();
will apply it to the whole input collection. The conversion function can be a lambda written inline but doesn't need to be (if the function has the right signature, like ConvertMethod then the compiler will convert it correctly to pass to Select).
answered Aug 16 '11 at 8:45
RichardRichard
89.1k17152220
1
Could you provide some real example, pls? Your answer is the best one!
– Academy of Programmer
Jan 10 '14 at 12:32
List<int> numbers = new List<int>() { 1, 2, 3 }; Func<int, string> numToStringWithLPad = i => "Number: " + i; var numAsString = numbers.Select(numToStringWithLPad); numAsString.ToList().ForEach(i => Console.WriteLine(i)); Output: Number: 1 Number: 2 Number: 3
– Win Man
May 5 '17 at 23:19
add a comment |
You need a function to convert a T instance to a U instance:
ResultType ConvertMethod(StartType input)
and you need to write this. Then
outputList = inputList.Select(ConvertMethod).ToList();
will apply it to the whole input collection. The conversion function can be a lambda written inline but doesn't need to be (if the function has the right signature, like ConvertMethod then the compiler will convert it correctly to pass to Select).
answered Aug 16 '11 at 8:45
RichardRichard
89.1k17152220
1
Could you provide some real example, pls? Your answer is the best one!
– Academy of Programmer
Jan 10 '14 at 12:32
List<int> numbers = new List<int>() { 1, 2, 3 }; Func<int, string> numToStringWithLPad = i => "Number: " + i; var numAsString = numbers.Select(numToStringWithLPad); numAsString.ToList().ForEach(i => Console.WriteLine(i)); Output: Number: 1 Number: 2 Number: 3
– Win Man
May 5 '17 at 23:19
add a comment |
You need a function to convert a T instance to a U instance:
ResultType ConvertMethod(StartType input)
and you need to write this. Then
outputList = inputList.Select(ConvertMethod).ToList();
will apply it to the whole input collection. The conversion function can be a lambda written inline but doesn't need to be (if the function has the right signature, like ConvertMethod then the compiler will convert it correctly to pass to Select).
answered Aug 16 '11 at 8:45
RichardRichard
89.1k17152220
You need a function to convert a T instance to a U instance:
ResultType ConvertMethod(StartType input)
and you need to write this. Then
outputList = inputList.Select(ConvertMethod).ToList();
will apply it to the whole input collection. The conversion function can be a lambda written inline but doesn't need to be (if the function has the right signature, like ConvertMethod then the compiler will convert it correctly to pass to Select).
answered Aug 16 '11 at 8:45
RichardRichard
89.1k17152220
answered Aug 16 '11 at 8:45
RichardRichard
89.1k17152220
answered Aug 16 '11 at 8:45
RichardRichard
89.1k17152220
answered Aug 16 '11 at 8:45
RichardRichard
89.1k17152220
89.1k17152220
1
Could you provide some real example, pls? Your answer is the best one!
– Academy of Programmer
Jan 10 '14 at 12:32
List<int> numbers = new List<int>() { 1, 2, 3 }; Func<int, string> numToStringWithLPad = i => "Number: " + i; var numAsString = numbers.Select(numToStringWithLPad); numAsString.ToList().ForEach(i => Console.WriteLine(i)); Output: Number: 1 Number: 2 Number: 3
– Win Man
May 5 '17 at 23:19
add a comment |
1
Could you provide some real example, pls? Your answer is the best one!
– Academy of Programmer
Jan 10 '14 at 12:32
List<int> numbers = new List<int>() { 1, 2, 3 }; Func<int, string> numToStringWithLPad = i => "Number: " + i; var numAsString = numbers.Select(numToStringWithLPad); numAsString.ToList().ForEach(i => Console.WriteLine(i)); Output: Number: 1 Number: 2 Number: 3
– Win Man
May 5 '17 at 23:19
1
1
Could you provide some real example, pls? Your answer is the best one!
– Academy of Programmer
Jan 10 '14 at 12:32
Could you provide some real example, pls? Your answer is the best one!
– Academy of Programmer
Jan 10 '14 at 12:32
List<int> numbers = new List<int>() { 1, 2, 3 }; Func<int, string> numToStringWithLPad = i => "Number: " + i; var numAsString = numbers.Select(numToStringWithLPad); numAsString.ToList().ForEach(i => Console.WriteLine(i)); Output: Number: 1 Number: 2 Number: 3
– Win Man
May 5 '17 at 23:19
List<int> numbers = new List<int>() { 1, 2, 3 }; Func<int, string> numToStringWithLPad = i => "Number: " + i; var numAsString = numbers.Select(numToStringWithLPad); numAsString.ToList().ForEach(i => Console.WriteLine(i)); Output: Number: 1 Number: 2 Number: 3
– Win Man
May 5 '17 at 23:19
add a comment |
Just use Select:
if(sil != null)
{
var iweil = sil.Select(item=>new InvoiceWithEntryInfo()
{
IdIWEI = item.ID,
AmountIWEI = item.Amount,
DateIWEI = item.Date
}).ToList();
}
answered Aug 16 '11 at 8:43
ForbesLindesayForbesLindesay
7,39623367
add a comment |
Just use Select:
if(sil != null)
{
var iweil = sil.Select(item=>new InvoiceWithEntryInfo()
{
IdIWEI = item.ID,
AmountIWEI = item.Amount,
DateIWEI = item.Date
}).ToList();
}
answered Aug 16 '11 at 8:43
ForbesLindesayForbesLindesay
7,39623367
add a comment |
Just use Select:
if(sil != null)
{
var iweil = sil.Select(item=>new InvoiceWithEntryInfo()
{
IdIWEI = item.ID,
AmountIWEI = item.Amount,
DateIWEI = item.Date
}).ToList();
}
answered Aug 16 '11 at 8:43
ForbesLindesayForbesLindesay
7,39623367
Just use Select:
if(sil != null)
{
var iweil = sil.Select(item=>new InvoiceWithEntryInfo()
{
IdIWEI = item.ID,
AmountIWEI = item.Amount,
DateIWEI = item.Date
}).ToList();
}
answered Aug 16 '11 at 8:43
ForbesLindesayForbesLindesay
7,39623367
answered Aug 16 '11 at 8:43
ForbesLindesayForbesLindesay
7,39623367
answered Aug 16 '11 at 8:43
ForbesLindesayForbesLindesay
7,39623367
answered Aug 16 '11 at 8:43
ForbesLindesayForbesLindesay
7,39623367
7,39623367
add a comment |
add a comment |
Your regular C# code and LINQ are not equivalent. In the regular C# you instantiate a new instance of the other class and initialize the properties, whereas you try to cast (well convert) from one to the other; however, since they are not in the same class hierarchy you can't cast, and as you haven't defined a conversion operator, you can't convert (using cast syntax) either.
You either have to define a conversion operator
public static explicit operator InvoiceWithEntryInfo(ServiceInfo item){
return new InvoiceWithEntryInfo {
IdIWEI = item.ID,
AmountIWEI = item.Amount,
DateIWEI = item.Date};
}
or a creation method using regular method signature. I'd suggest the latter since the former pretend to be something it's not. It's not a cast and I'd personally like to be able to see that the code creates a new instance based on some input.
edited Aug 16 '11 at 11:56
Clint
4,70511837
answered Aug 16 '11 at 9:00
Rune FSRune FS
18.3k64887
add a comment |
Your regular C# code and LINQ are not equivalent. In the regular C# you instantiate a new instance of the other class and initialize the properties, whereas you try to cast (well convert) from one to the other; however, since they are not in the same class hierarchy you can't cast, and as you haven't defined a conversion operator, you can't convert (using cast syntax) either.
You either have to define a conversion operator
public static explicit operator InvoiceWithEntryInfo(ServiceInfo item){
return new InvoiceWithEntryInfo {
IdIWEI = item.ID,
AmountIWEI = item.Amount,
DateIWEI = item.Date};
}
or a creation method using regular method signature. I'd suggest the latter since the former pretend to be something it's not. It's not a cast and I'd personally like to be able to see that the code creates a new instance based on some input.
edited Aug 16 '11 at 11:56
Clint
4,70511837
answered Aug 16 '11 at 9:00
Rune FSRune FS
18.3k64887
add a comment |
Your regular C# code and LINQ are not equivalent. In the regular C# you instantiate a new instance of the other class and initialize the properties, whereas you try to cast (well convert) from one to the other; however, since they are not in the same class hierarchy you can't cast, and as you haven't defined a conversion operator, you can't convert (using cast syntax) either.
You either have to define a conversion operator
public static explicit operator InvoiceWithEntryInfo(ServiceInfo item){
return new InvoiceWithEntryInfo {
IdIWEI = item.ID,
AmountIWEI = item.Amount,
DateIWEI = item.Date};
}
or a creation method using regular method signature. I'd suggest the latter since the former pretend to be something it's not. It's not a cast and I'd personally like to be able to see that the code creates a new instance based on some input.
edited Aug 16 '11 at 11:56
Clint
4,70511837
answered Aug 16 '11 at 9:00
Rune FSRune FS
18.3k64887
Your regular C# code and LINQ are not equivalent. In the regular C# you instantiate a new instance of the other class and initialize the properties, whereas you try to cast (well convert) from one to the other; however, since they are not in the same class hierarchy you can't cast, and as you haven't defined a conversion operator, you can't convert (using cast syntax) either.
You either have to define a conversion operator
public static explicit operator InvoiceWithEntryInfo(ServiceInfo item){
return new InvoiceWithEntryInfo {
IdIWEI = item.ID,
AmountIWEI = item.Amount,
DateIWEI = item.Date};
}
or a creation method using regular method signature. I'd suggest the latter since the former pretend to be something it's not. It's not a cast and I'd personally like to be able to see that the code creates a new instance based on some input.
edited Aug 16 '11 at 11:56
Clint
4,70511837
answered Aug 16 '11 at 9:00
Rune FSRune FS
18.3k64887
edited Aug 16 '11 at 11:56
Clint
4,70511837
edited Aug 16 '11 at 11:56
Clint
4,70511837
edited Aug 16 '11 at 11:56
Clint
4,70511837
4,70511837
answered Aug 16 '11 at 9:00
Rune FSRune FS
18.3k64887
answered Aug 16 '11 at 9:00
Rune FSRune FS
18.3k64887
answered Aug 16 '11 at 9:00
Rune FSRune FS
18.3k64887
18.3k64887
add a comment |
add a comment |
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