C# class linq extension
1
I have written an extension method for two classes. Like this:
public static ICollection<Class1> ExceptTestUser(this ICollection<Class1> list)
{
Func<Class1, bool> _func = i => !i.Name.Equals("Test", StringComparison.InvariantCultureIgnoreCase);
return list.Where(_func).ToList();
}
public static ICollection<Class2> ExceptTestUser(this ICollection<Class2> list)
{
Func<Class2, bool> _func = i => !i.Name.Equals("Test", StringComparison.InvariantCultureIgnoreCase);
return list.Where(_func).ToList();
}
Both Class1 and Class2 have Name properties present.
This works fine, however, I am curious if there is any way I can create a generic method for this where I can pass the type T.
I think, this can be done by using System.Linq.Dynamic. Is there any other way to do such a thing.
c# linq
asked Dec 31 '18 at 6:59
Praneet NadkarPraneet Nadkar
495212
add a comment |
1
I have written an extension method for two classes. Like this:
public static ICollection<Class1> ExceptTestUser(this ICollection<Class1> list)
{
Func<Class1, bool> _func = i => !i.Name.Equals("Test", StringComparison.InvariantCultureIgnoreCase);
return list.Where(_func).ToList();
}
public static ICollection<Class2> ExceptTestUser(this ICollection<Class2> list)
{
Func<Class2, bool> _func = i => !i.Name.Equals("Test", StringComparison.InvariantCultureIgnoreCase);
return list.Where(_func).ToList();
}
Both Class1 and Class2 have Name properties present.
This works fine, however, I am curious if there is any way I can create a generic method for this where I can pass the type T.
I think, this can be done by using System.Linq.Dynamic. Is there any other way to do such a thing.
c# linq
asked Dec 31 '18 at 6:59
Praneet NadkarPraneet Nadkar
495212
1
Using interface is the one way.
– Coder of Code
Dec 31 '18 at 7:10
add a comment |
1
1
1
I have written an extension method for two classes. Like this:
public static ICollection<Class1> ExceptTestUser(this ICollection<Class1> list)
{
Func<Class1, bool> _func = i => !i.Name.Equals("Test", StringComparison.InvariantCultureIgnoreCase);
return list.Where(_func).ToList();
}
public static ICollection<Class2> ExceptTestUser(this ICollection<Class2> list)
{
Func<Class2, bool> _func = i => !i.Name.Equals("Test", StringComparison.InvariantCultureIgnoreCase);
return list.Where(_func).ToList();
}
Both Class1 and Class2 have Name properties present.
This works fine, however, I am curious if there is any way I can create a generic method for this where I can pass the type T.
I think, this can be done by using System.Linq.Dynamic. Is there any other way to do such a thing.
c# linq
asked Dec 31 '18 at 6:59
Praneet NadkarPraneet Nadkar
495212
I have written an extension method for two classes. Like this:
public static ICollection<Class1> ExceptTestUser(this ICollection<Class1> list)
{
Func<Class1, bool> _func = i => !i.Name.Equals("Test", StringComparison.InvariantCultureIgnoreCase);
return list.Where(_func).ToList();
}
public static ICollection<Class2> ExceptTestUser(this ICollection<Class2> list)
{
Func<Class2, bool> _func = i => !i.Name.Equals("Test", StringComparison.InvariantCultureIgnoreCase);
return list.Where(_func).ToList();
}
Both Class1 and Class2 have Name properties present.
This works fine, however, I am curious if there is any way I can create a generic method for this where I can pass the type T.
I think, this can be done by using System.Linq.Dynamic. Is there any other way to do such a thing.
c# linq
c# linq
asked Dec 31 '18 at 6:59
Praneet NadkarPraneet Nadkar
495212
asked Dec 31 '18 at 6:59
Praneet NadkarPraneet Nadkar
495212
asked Dec 31 '18 at 6:59
Praneet NadkarPraneet Nadkar
495212
asked Dec 31 '18 at 6:59
Praneet NadkarPraneet Nadkar
495212
asked Dec 31 '18 at 6:59
Praneet NadkarPraneet Nadkar
495212
495212
1
Using interface is the one way.
– Coder of Code
Dec 31 '18 at 7:10
add a comment |
1
Using interface is the one way.
– Coder of Code
Dec 31 '18 at 7:10
1
1
Using interface is the one way.
– Coder of Code
Dec 31 '18 at 7:10
Using interface is the one way.
– Coder of Code
Dec 31 '18 at 7:10
add a comment |
2 Answers
2
active
oldest
votes
1
You can create an interface called IHasName and make Class1 and Class2 implement it:
interface IHasName {
string Name { get; }
}
class Class1 : IHasName {
...
}
class Class2 : IHasName {
...
}
Then you can write a single method like this:
public static ICollection<T> ExceptTestUser<T>(this ICollection<T> list) where T : IHasName
{
Func<T, bool> _func = i => !i.Name.Equals("Test", StringComparison.InvariantCultureIgnoreCase);
return list.Where(_func).ToList();
}
answered Dec 31 '18 at 7:07
SweeperSweeper
66.8k1073139
This works perfect! Thank you
– Praneet Nadkar
Dec 31 '18 at 8:55
add a comment |
1
If you want to use the same extension method for classes without interface, you need to use reflection to get the property.
// Uses reflection to return value of the property or null
public static T GetPropValue<T>(this object src, string propName) where T : class
{
return src.GetType().GetProperty(propName)?.GetValue(src, null) as T;
}
public static ICollection<T> ExceptTestUser<T>(this ICollection<T> list)
{
// If property exists, do equality check, otherwise just accept the value
Func<T, bool> _func = i => !i.GetPropValue<string>("Name")?.Equals("Test", StringComparison.InvariantCultureIgnoreCase) ?? true;
return list.Where(_func).ToList();
}
answered Dec 31 '18 at 7:37
WoteWote
986
What if the class does not have the property "Name", it would throw an exception?
– Praneet Nadkar
Dec 31 '18 at 8:57
It does not throw an exception, because inGetPropValue<T>the GetProperty method returns null and the next operator is null-coalescing?.in case of missing property. Also theExceptTestUserhas this null-coalescing operation after theGetPropValueand it defaults to true in case of nulls. This worked on my test cases without exceptions.
– Wote
Dec 31 '18 at 12:14
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
1
You can create an interface called IHasName and make Class1 and Class2 implement it:
interface IHasName {
string Name { get; }
}
class Class1 : IHasName {
...
}
class Class2 : IHasName {
...
}
Then you can write a single method like this:
public static ICollection<T> ExceptTestUser<T>(this ICollection<T> list) where T : IHasName
{
Func<T, bool> _func = i => !i.Name.Equals("Test", StringComparison.InvariantCultureIgnoreCase);
return list.Where(_func).ToList();
}
answered Dec 31 '18 at 7:07
SweeperSweeper
66.8k1073139
This works perfect! Thank you
– Praneet Nadkar
Dec 31 '18 at 8:55
add a comment |
1
You can create an interface called IHasName and make Class1 and Class2 implement it:
interface IHasName {
string Name { get; }
}
class Class1 : IHasName {
...
}
class Class2 : IHasName {
...
}
Then you can write a single method like this:
public static ICollection<T> ExceptTestUser<T>(this ICollection<T> list) where T : IHasName
{
Func<T, bool> _func = i => !i.Name.Equals("Test", StringComparison.InvariantCultureIgnoreCase);
return list.Where(_func).ToList();
}
answered Dec 31 '18 at 7:07
SweeperSweeper
66.8k1073139
This works perfect! Thank you
– Praneet Nadkar
Dec 31 '18 at 8:55
add a comment |
1
1
1
You can create an interface called IHasName and make Class1 and Class2 implement it:
interface IHasName {
string Name { get; }
}
class Class1 : IHasName {
...
}
class Class2 : IHasName {
...
}
Then you can write a single method like this:
public static ICollection<T> ExceptTestUser<T>(this ICollection<T> list) where T : IHasName
{
Func<T, bool> _func = i => !i.Name.Equals("Test", StringComparison.InvariantCultureIgnoreCase);
return list.Where(_func).ToList();
}
answered Dec 31 '18 at 7:07
SweeperSweeper
66.8k1073139
You can create an interface called IHasName and make Class1 and Class2 implement it:
interface IHasName {
string Name { get; }
}
class Class1 : IHasName {
...
}
class Class2 : IHasName {
...
}
Then you can write a single method like this:
public static ICollection<T> ExceptTestUser<T>(this ICollection<T> list) where T : IHasName
{
Func<T, bool> _func = i => !i.Name.Equals("Test", StringComparison.InvariantCultureIgnoreCase);
return list.Where(_func).ToList();
}
answered Dec 31 '18 at 7:07
SweeperSweeper
66.8k1073139
answered Dec 31 '18 at 7:07
SweeperSweeper
66.8k1073139
answered Dec 31 '18 at 7:07
SweeperSweeper
66.8k1073139
answered Dec 31 '18 at 7:07
SweeperSweeper
66.8k1073139
66.8k1073139
This works perfect! Thank you
– Praneet Nadkar
Dec 31 '18 at 8:55
add a comment |
This works perfect! Thank you
– Praneet Nadkar
Dec 31 '18 at 8:55
This works perfect! Thank you
– Praneet Nadkar
Dec 31 '18 at 8:55
This works perfect! Thank you
– Praneet Nadkar
Dec 31 '18 at 8:55
add a comment |
1
If you want to use the same extension method for classes without interface, you need to use reflection to get the property.
// Uses reflection to return value of the property or null
public static T GetPropValue<T>(this object src, string propName) where T : class
{
return src.GetType().GetProperty(propName)?.GetValue(src, null) as T;
}
public static ICollection<T> ExceptTestUser<T>(this ICollection<T> list)
{
// If property exists, do equality check, otherwise just accept the value
Func<T, bool> _func = i => !i.GetPropValue<string>("Name")?.Equals("Test", StringComparison.InvariantCultureIgnoreCase) ?? true;
return list.Where(_func).ToList();
}
answered Dec 31 '18 at 7:37
WoteWote
986
What if the class does not have the property "Name", it would throw an exception?
– Praneet Nadkar
Dec 31 '18 at 8:57
It does not throw an exception, because inGetPropValue<T>the GetProperty method returns null and the next operator is null-coalescing?.in case of missing property. Also theExceptTestUserhas this null-coalescing operation after theGetPropValueand it defaults to true in case of nulls. This worked on my test cases without exceptions.
– Wote
Dec 31 '18 at 12:14
add a comment |
1
If you want to use the same extension method for classes without interface, you need to use reflection to get the property.
// Uses reflection to return value of the property or null
public static T GetPropValue<T>(this object src, string propName) where T : class
{
return src.GetType().GetProperty(propName)?.GetValue(src, null) as T;
}
public static ICollection<T> ExceptTestUser<T>(this ICollection<T> list)
{
// If property exists, do equality check, otherwise just accept the value
Func<T, bool> _func = i => !i.GetPropValue<string>("Name")?.Equals("Test", StringComparison.InvariantCultureIgnoreCase) ?? true;
return list.Where(_func).ToList();
}
answered Dec 31 '18 at 7:37
WoteWote
986
What if the class does not have the property "Name", it would throw an exception?
– Praneet Nadkar
Dec 31 '18 at 8:57
It does not throw an exception, because inGetPropValue<T>the GetProperty method returns null and the next operator is null-coalescing?.in case of missing property. Also theExceptTestUserhas this null-coalescing operation after theGetPropValueand it defaults to true in case of nulls. This worked on my test cases without exceptions.
– Wote
Dec 31 '18 at 12:14
add a comment |
1
1
1
If you want to use the same extension method for classes without interface, you need to use reflection to get the property.
// Uses reflection to return value of the property or null
public static T GetPropValue<T>(this object src, string propName) where T : class
{
return src.GetType().GetProperty(propName)?.GetValue(src, null) as T;
}
public static ICollection<T> ExceptTestUser<T>(this ICollection<T> list)
{
// If property exists, do equality check, otherwise just accept the value
Func<T, bool> _func = i => !i.GetPropValue<string>("Name")?.Equals("Test", StringComparison.InvariantCultureIgnoreCase) ?? true;
return list.Where(_func).ToList();
}
answered Dec 31 '18 at 7:37
WoteWote
986
If you want to use the same extension method for classes without interface, you need to use reflection to get the property.
// Uses reflection to return value of the property or null
public static T GetPropValue<T>(this object src, string propName) where T : class
{
return src.GetType().GetProperty(propName)?.GetValue(src, null) as T;
}
public static ICollection<T> ExceptTestUser<T>(this ICollection<T> list)
{
// If property exists, do equality check, otherwise just accept the value
Func<T, bool> _func = i => !i.GetPropValue<string>("Name")?.Equals("Test", StringComparison.InvariantCultureIgnoreCase) ?? true;
return list.Where(_func).ToList();
}
answered Dec 31 '18 at 7:37
WoteWote
986
edited Dec 31 '18 at 7:46
answered Dec 31 '18 at 7:37
WoteWote
986
answered Dec 31 '18 at 7:37
WoteWote
986
answered Dec 31 '18 at 7:37
WoteWote
986
986
What if the class does not have the property "Name", it would throw an exception?
– Praneet Nadkar
Dec 31 '18 at 8:57
It does not throw an exception, because inGetPropValue<T>the GetProperty method returns null and the next operator is null-coalescing?.in case of missing property. Also theExceptTestUserhas this null-coalescing operation after theGetPropValueand it defaults to true in case of nulls. This worked on my test cases without exceptions.
– Wote
Dec 31 '18 at 12:14
add a comment |
What if the class does not have the property "Name", it would throw an exception?
– Praneet Nadkar
Dec 31 '18 at 8:57
It does not throw an exception, because inGetPropValue<T>the GetProperty method returns null and the next operator is null-coalescing?.in case of missing property. Also theExceptTestUserhas this null-coalescing operation after theGetPropValueand it defaults to true in case of nulls. This worked on my test cases without exceptions.
– Wote
Dec 31 '18 at 12:14
What if the class does not have the property "Name", it would throw an exception?
– Praneet Nadkar
Dec 31 '18 at 8:57
What if the class does not have the property "Name", it would throw an exception?
– Praneet Nadkar
Dec 31 '18 at 8:57
It does not throw an exception, because in
GetPropValue<T> the GetProperty method returns null and the next operator is null-coalescing ?. in case of missing property. Also the ExceptTestUser has this null-coalescing operation after the GetPropValue and it defaults to true in case of nulls. This worked on my test cases without exceptions.– Wote
Dec 31 '18 at 12:14
It does not throw an exception, because in
GetPropValue<T> the GetProperty method returns null and the next operator is null-coalescing ?. in case of missing property. Also the ExceptTestUser has this null-coalescing operation after the GetPropValue and it defaults to true in case of nulls. This worked on my test cases without exceptions.– Wote
Dec 31 '18 at 12:14
add a comment |
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1
Using interface is the one way.
– Coder of Code
Dec 31 '18 at 7:10