88 lines
2.5 KiB
C#
88 lines
2.5 KiB
C#
using System.Linq.Expressions;
|
|
using System.Reflection;
|
|
|
|
TestClassRepo repo = new();
|
|
|
|
var test = repo.Get(_ => _.Name == "Test" || _.Id == "TestId2");
|
|
|
|
var testexpression = repo.Get(filter: [ new() { Name = "Test2", Description = "Test2" }]);
|
|
|
|
Console.WriteLine(test);
|
|
|
|
Console.ReadLine();
|
|
|
|
public class TestClass
|
|
{
|
|
public string Name { get; set; }
|
|
public string Id { get; set; }
|
|
public string Description { get; set; }
|
|
public bool? IsActive { get; set; }
|
|
}
|
|
|
|
public class TestClassRepo
|
|
{
|
|
private List<TestClass> _list = [new() { Name = "Test" , Id = "TestId" }, new() { Name = "Test2" , Id = "TestId2", Description = "Test2" }, new() { Name = "Test3" , Id = "Test3" } ];
|
|
|
|
public List<TestClass> Get(Predicate<TestClass>? predicate = null, List<TestClass>? filter = null)
|
|
{
|
|
if (predicate != null)
|
|
{
|
|
return TestUtils.Get<TestClass>(predicate, _list);
|
|
}
|
|
else if (filter != null)
|
|
{
|
|
return TestUtils.GetFilter<TestClass>(filter, _list);
|
|
}
|
|
|
|
return _list;
|
|
}
|
|
}
|
|
|
|
public class TestUtils
|
|
{
|
|
public static List<T> Get<T>(Predicate<T> predicate, IEnumerable<T> collection)
|
|
{
|
|
List<T> result = [];
|
|
|
|
foreach (var item in collection)
|
|
{
|
|
if (predicate(item))
|
|
{
|
|
result.Add(item);
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
public static List<T> GetFilter<T>(List<T> obj, List<T> collection)
|
|
{
|
|
ParameterExpression param = Expression.Parameter(typeof(T));
|
|
Expression predicate = Expression.Constant(true);
|
|
|
|
foreach (var item in obj)
|
|
{
|
|
PropertyInfo[] properties = typeof(T).GetProperties();
|
|
|
|
foreach (PropertyInfo property in properties)
|
|
{
|
|
string name = property.Name;
|
|
var value = property.GetValue(item);
|
|
|
|
if (value is not null)
|
|
{
|
|
MemberExpression propertyExpression = Expression.Property(param, name);
|
|
|
|
ConstantExpression constant = Expression.Constant(value);
|
|
|
|
BinaryExpression body = Expression.Equal(propertyExpression, constant);
|
|
|
|
predicate = Expression.AndAlso(predicate, body);
|
|
}
|
|
}
|
|
}
|
|
|
|
var lambda = Expression.Lambda<Func<T, bool>>(predicate, param);
|
|
return collection.Where(lambda.Compile()).ToList();
|
|
}
|
|
} |