Use multi-field List from Deserialized XML file to populate second single field list (Xamarin)

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This has to be so simple... in T-SQL it would take me a second.

Before I get duplicate flags... I have been trying some similar problems posted and I have been on this for hours, tinkering with various replies involving JTokens, changing to IEnumerable, deserializing one field only to name a few. I keep getting errors such as:

xamarin cannot implicitly convert type
'System.Collections.Generic.List to 'System.Colletions.List

I have deserialized an xml file into a list like so:

        var assembly = IntrospectionExtensions.GetTypeInfo(typeof(LoadResourceText)).Assembly;

        Stream stream = assembly.GetManifestResourceStream("papapp.WineCatInfo.xml");



        List<WineCategoryInfo> winecategoryinfos;

        using (var reader = new StreamReader(stream))

        {

            var serializer = new XmlSerializer(typeof(List<WineCategoryInfo>));

            winecategoryinfos = (List<WineCategoryInfo>)serializer.Deserialize(reader);

        }

        #endregion



        return winecategoryinfos;

The list it populates is defined like so:

public class WineCategoryInfo

    {

        public string WineTypeNo { get; set; }

        public string WineFamily { get; set; }

        public string MainStyle { get; set; }

        public string StyleType { get; set; }

        public string LengthCharacteristic { get; set; }

        public string RegionCommonAppelation { get; set; }

    }

I would like a query on the deserialized date to place all the values of one particular field from the above list into a second list, defined like so:

public class WineFamilies

    {    

        public string WineFamily { get; set; }    

    }

Can someone explain to me how to achieve this?

Many thanks.

asked Nov 26 '18 at 17:44

Mark

74211

add a comment |

This has to be so simple... in T-SQL it would take me a second.

xamarin cannot implicitly convert type
'System.Collections.Generic.List to 'System.Colletions.List

I have deserialized an xml file into a list like so:

        var assembly = IntrospectionExtensions.GetTypeInfo(typeof(LoadResourceText)).Assembly;

        Stream stream = assembly.GetManifestResourceStream("papapp.WineCatInfo.xml");



        List<WineCategoryInfo> winecategoryinfos;

        using (var reader = new StreamReader(stream))

        {

            var serializer = new XmlSerializer(typeof(List<WineCategoryInfo>));

            winecategoryinfos = (List<WineCategoryInfo>)serializer.Deserialize(reader);

        }

        #endregion



        return winecategoryinfos;

The list it populates is defined like so:

public class WineCategoryInfo

    {

        public string WineTypeNo { get; set; }

        public string WineFamily { get; set; }

        public string MainStyle { get; set; }

        public string StyleType { get; set; }

        public string LengthCharacteristic { get; set; }

        public string RegionCommonAppelation { get; set; }

    }

I would like a query on the deserialized date to place all the values of one particular field from the above list into a second list, defined like so:

public class WineFamilies

    {    

        public string WineFamily { get; set; }    

    }

Can someone explain to me how to achieve this?

Many thanks.

asked Nov 26 '18 at 17:44

Mark

74211

add a comment |

This has to be so simple... in T-SQL it would take me a second.

xamarin cannot implicitly convert type
'System.Collections.Generic.List to 'System.Colletions.List

I have deserialized an xml file into a list like so:

        var assembly = IntrospectionExtensions.GetTypeInfo(typeof(LoadResourceText)).Assembly;

        Stream stream = assembly.GetManifestResourceStream("papapp.WineCatInfo.xml");



        List<WineCategoryInfo> winecategoryinfos;

        using (var reader = new StreamReader(stream))

        {

            var serializer = new XmlSerializer(typeof(List<WineCategoryInfo>));

            winecategoryinfos = (List<WineCategoryInfo>)serializer.Deserialize(reader);

        }

        #endregion



        return winecategoryinfos;

The list it populates is defined like so:

public class WineCategoryInfo

    {

        public string WineTypeNo { get; set; }

        public string WineFamily { get; set; }

        public string MainStyle { get; set; }

        public string StyleType { get; set; }

        public string LengthCharacteristic { get; set; }

        public string RegionCommonAppelation { get; set; }

    }

I would like a query on the deserialized date to place all the values of one particular field from the above list into a second list, defined like so:

public class WineFamilies

    {    

        public string WineFamily { get; set; }    

    }

Can someone explain to me how to achieve this?

Many thanks.

asked Nov 26 '18 at 17:44

Mark

74211

This has to be so simple... in T-SQL it would take me a second.

xamarin cannot implicitly convert type
'System.Collections.Generic.List to 'System.Colletions.List

I have deserialized an xml file into a list like so:

        var assembly = IntrospectionExtensions.GetTypeInfo(typeof(LoadResourceText)).Assembly;

        Stream stream = assembly.GetManifestResourceStream("papapp.WineCatInfo.xml");



        List<WineCategoryInfo> winecategoryinfos;

        using (var reader = new StreamReader(stream))

        {

            var serializer = new XmlSerializer(typeof(List<WineCategoryInfo>));

            winecategoryinfos = (List<WineCategoryInfo>)serializer.Deserialize(reader);

        }

        #endregion



        return winecategoryinfos;

The list it populates is defined like so:

public class WineCategoryInfo

    {

        public string WineTypeNo { get; set; }

        public string WineFamily { get; set; }

        public string MainStyle { get; set; }

        public string StyleType { get; set; }

        public string LengthCharacteristic { get; set; }

        public string RegionCommonAppelation { get; set; }

    }

I would like a query on the deserialized date to place all the values of one particular field from the above list into a second list, defined like so:

public class WineFamilies

    {    

        public string WineFamily { get; set; }    

    }

Can someone explain to me how to achieve this?

Many thanks.

c# xamarin xamarin.forms xml-parsing json-deserialization

asked Nov 26 '18 at 17:44

Mark

74211

asked Nov 26 '18 at 17:44

Mark

74211

asked Nov 26 '18 at 17:44

Mark

74211

asked Nov 26 '18 at 17:44

Mark

74211

asked Nov 26 '18 at 17:44

Mark

74211

add a comment |

1 Answer
1

active

oldest

votes

use LINQ

using System.Linq;



var family = (from x in winecategoryinfos select x.WineFamily).ToList<string>();

or to eliminate duplicates

var family = (from x in winecategoryinfos select x.WineFamily).Distinct().ToList<string>();

if you want to use your WineFamilies class instead of string, try

var family = (from x in winecategoryinfos select new WineFamilies() { WineFamily = x.WineFamily }).ToList();

edited Nov 26 '18 at 18:41

answered Nov 26 '18 at 17:53

Jason

52.8k1292120

Thanks @Jason, But this does not work for me for some reason. I'm sooo glad you replied that as I had tried that and could not see what the prob was. Inserting your suggestion exactly, typing "return family;" in a "public class List<WineFamilies> winefamilies()" gives me the dreaded "Cannot implicitly convert type 'Systems.Collections.Generic.List<string>' to 'Systems.Collections.Generic.List<pappapp.WineFamilies>'

– Mark
Nov 26 '18 at 18:15

see my additional example

– Jason
Nov 26 '18 at 18:34

Unfortunately that's not working, the resulting array is populated purely with lines of "papapp.Winefamilies". So if I put this in the picker: BindingContext = new TodoListPageViewModel WinecatList = GetWineInfo() }; All I get is "papapp.WineFamilies" throughout the picker.

– Mark
Nov 26 '18 at 19:05

that is most likely a problem with how your Picker bindings are setup, and has nothing to do with how you're generating the data

– Jason
Nov 26 '18 at 19:06

1

Picker has a ItemDisplayBinding property that you can use to specify which property to display. If you don't use this, it will just call ToString() on the class, which by default returns the name of the class

– Jason
Nov 26 '18 at 19:08

|
show 5 more comments

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1 Answer
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active

oldest

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1 Answer
1

active

oldest

votes

use LINQ

using System.Linq;



var family = (from x in winecategoryinfos select x.WineFamily).ToList<string>();

or to eliminate duplicates

var family = (from x in winecategoryinfos select x.WineFamily).Distinct().ToList<string>();

if you want to use your WineFamilies class instead of string, try

var family = (from x in winecategoryinfos select new WineFamilies() { WineFamily = x.WineFamily }).ToList();

edited Nov 26 '18 at 18:41

answered Nov 26 '18 at 17:53

Jason

52.8k1292120

Thanks @Jason, But this does not work for me for some reason. I'm sooo glad you replied that as I had tried that and could not see what the prob was. Inserting your suggestion exactly, typing "return family;" in a "public class List<WineFamilies> winefamilies()" gives me the dreaded "Cannot implicitly convert type 'Systems.Collections.Generic.List<string>' to 'Systems.Collections.Generic.List<pappapp.WineFamilies>'

– Mark
Nov 26 '18 at 18:15

see my additional example

– Jason
Nov 26 '18 at 18:34

Unfortunately that's not working, the resulting array is populated purely with lines of "papapp.Winefamilies". So if I put this in the picker: BindingContext = new TodoListPageViewModel WinecatList = GetWineInfo() }; All I get is "papapp.WineFamilies" throughout the picker.

– Mark
Nov 26 '18 at 19:05

that is most likely a problem with how your Picker bindings are setup, and has nothing to do with how you're generating the data

– Jason
Nov 26 '18 at 19:06

1

Picker has a ItemDisplayBinding property that you can use to specify which property to display. If you don't use this, it will just call ToString() on the class, which by default returns the name of the class

– Jason
Nov 26 '18 at 19:08

|
show 5 more comments

use LINQ

using System.Linq;



var family = (from x in winecategoryinfos select x.WineFamily).ToList<string>();

or to eliminate duplicates

var family = (from x in winecategoryinfos select x.WineFamily).Distinct().ToList<string>();

if you want to use your WineFamilies class instead of string, try

var family = (from x in winecategoryinfos select new WineFamilies() { WineFamily = x.WineFamily }).ToList();

edited Nov 26 '18 at 18:41

answered Nov 26 '18 at 17:53

Jason

52.8k1292120

Thanks @Jason, But this does not work for me for some reason. I'm sooo glad you replied that as I had tried that and could not see what the prob was. Inserting your suggestion exactly, typing "return family;" in a "public class List<WineFamilies> winefamilies()" gives me the dreaded "Cannot implicitly convert type 'Systems.Collections.Generic.List<string>' to 'Systems.Collections.Generic.List<pappapp.WineFamilies>'

– Mark
Nov 26 '18 at 18:15

see my additional example

– Jason
Nov 26 '18 at 18:34

Unfortunately that's not working, the resulting array is populated purely with lines of "papapp.Winefamilies". So if I put this in the picker: BindingContext = new TodoListPageViewModel WinecatList = GetWineInfo() }; All I get is "papapp.WineFamilies" throughout the picker.

– Mark
Nov 26 '18 at 19:05

that is most likely a problem with how your Picker bindings are setup, and has nothing to do with how you're generating the data

– Jason
Nov 26 '18 at 19:06

1

Picker has a ItemDisplayBinding property that you can use to specify which property to display. If you don't use this, it will just call ToString() on the class, which by default returns the name of the class

– Jason
Nov 26 '18 at 19:08

|
show 5 more comments

use LINQ

using System.Linq;



var family = (from x in winecategoryinfos select x.WineFamily).ToList<string>();

or to eliminate duplicates

var family = (from x in winecategoryinfos select x.WineFamily).Distinct().ToList<string>();

if you want to use your WineFamilies class instead of string, try

var family = (from x in winecategoryinfos select new WineFamilies() { WineFamily = x.WineFamily }).ToList();

edited Nov 26 '18 at 18:41

answered Nov 26 '18 at 17:53

Jason

52.8k1292120

use LINQ

using System.Linq;



var family = (from x in winecategoryinfos select x.WineFamily).ToList<string>();

or to eliminate duplicates

var family = (from x in winecategoryinfos select x.WineFamily).Distinct().ToList<string>();

if you want to use your WineFamilies class instead of string, try

var family = (from x in winecategoryinfos select new WineFamilies() { WineFamily = x.WineFamily }).ToList();

edited Nov 26 '18 at 18:41

answered Nov 26 '18 at 17:53

Jason

52.8k1292120

edited Nov 26 '18 at 18:41

answered Nov 26 '18 at 17:53

Jason

52.8k1292120

answered Nov 26 '18 at 17:53

Jason

52.8k1292120

answered Nov 26 '18 at 17:53

Jason

52.8k1292120

Thanks @Jason, But this does not work for me for some reason. I'm sooo glad you replied that as I had tried that and could not see what the prob was. Inserting your suggestion exactly, typing "return family;" in a "public class List<WineFamilies> winefamilies()" gives me the dreaded "Cannot implicitly convert type 'Systems.Collections.Generic.List<string>' to 'Systems.Collections.Generic.List<pappapp.WineFamilies>'

– Mark
Nov 26 '18 at 18:15

see my additional example

– Jason
Nov 26 '18 at 18:34

Unfortunately that's not working, the resulting array is populated purely with lines of "papapp.Winefamilies". So if I put this in the picker: BindingContext = new TodoListPageViewModel WinecatList = GetWineInfo() }; All I get is "papapp.WineFamilies" throughout the picker.

– Mark
Nov 26 '18 at 19:05

that is most likely a problem with how your Picker bindings are setup, and has nothing to do with how you're generating the data

– Jason
Nov 26 '18 at 19:06

1

Picker has a ItemDisplayBinding property that you can use to specify which property to display. If you don't use this, it will just call ToString() on the class, which by default returns the name of the class

– Jason
Nov 26 '18 at 19:08

|
show 5 more comments

Thanks @Jason, But this does not work for me for some reason. I'm sooo glad you replied that as I had tried that and could not see what the prob was. Inserting your suggestion exactly, typing "return family;" in a "public class List<WineFamilies> winefamilies()" gives me the dreaded "Cannot implicitly convert type 'Systems.Collections.Generic.List<string>' to 'Systems.Collections.Generic.List<pappapp.WineFamilies>'

– Mark
Nov 26 '18 at 18:15

see my additional example

– Jason
Nov 26 '18 at 18:34

Unfortunately that's not working, the resulting array is populated purely with lines of "papapp.Winefamilies". So if I put this in the picker: BindingContext = new TodoListPageViewModel WinecatList = GetWineInfo() }; All I get is "papapp.WineFamilies" throughout the picker.

– Mark
Nov 26 '18 at 19:05

that is most likely a problem with how your Picker bindings are setup, and has nothing to do with how you're generating the data

– Jason
Nov 26 '18 at 19:06

1

Picker has a ItemDisplayBinding property that you can use to specify which property to display. If you don't use this, it will just call ToString() on the class, which by default returns the name of the class

– Jason
Nov 26 '18 at 19:08

Thanks @Jason, But this does not work for me for some reason. I'm sooo glad you replied that as I had tried that and could not see what the prob was. Inserting your suggestion exactly, typing "return family;" in a "public class List<WineFamilies> winefamilies()" gives me the dreaded "Cannot implicitly convert type 'Systems.Collections.Generic.List<string>' to 'Systems.Collections.Generic.List<pappapp.WineFamilies>'

– Mark
Nov 26 '18 at 18:15

see my additional example

– Jason
Nov 26 '18 at 18:34

Unfortunately that's not working, the resulting array is populated purely with lines of "papapp.Winefamilies". So if I put this in the picker: BindingContext = new TodoListPageViewModel WinecatList = GetWineInfo() }; All I get is "papapp.WineFamilies" throughout the picker.

– Mark
Nov 26 '18 at 19:05

that is most likely a problem with how your Picker bindings are setup, and has nothing to do with how you're generating the data

– Jason
Nov 26 '18 at 19:06

Picker has a ItemDisplayBinding property that you can use to specify which property to display. If you don't use this, it will just call ToString() on the class, which by default returns the name of the class

– Jason
Nov 26 '18 at 19:08

|
show 5 more comments

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