I want to make a method accept Expression like this
public class MyClass
{
public void MyMethod( Expression<Func<T> expression)
{}
}
public class FooClass
{
public string Foo { get; set; }
}
MyClass A = new MyClass();
A.MyMethod( (FooClass x) => x.Foo );
How can I implement this? thank you in advance.
First of all, what is your goal in implementing such a class? What result do you want to return? Here is an example of how to use it for you
public class MyClass
{
IQueryable<FooClass> myQuery;
public MyClass()
{
myQuery = new List<FooClass>() { new FooClass() { Foo = "foo1"}, new FooClass() { Foo = "foo1" }, new FooClass() { Foo = "foo2" } }.AsQueryable();
}
public IQueryable<FooClass> WhereMethod(Expression<Func<FooClass, bool>> predicate)
{
try
{
return myQuery.Where(predicate);
}
catch
{
return null;
}
}
public IQueryable<TResult> SelectMethod<TResult>(Expression<Func<FooClass, TResult>> predicate)
{
try
{
return myQuery.Select(predicate);
}
catch
{
return null;
}
}
}
public class FooClass
{
public string Foo { get; set; }
}
now use
MyClass myClass = new MyClass();
var fooList = myClass.WhereMethod(a => a.Foo == "foo1").ToList();
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