CODEWITHSUNDEEP
c#reflectioniqueryable
nerdperson
nerdperson

Reputation: 297

Create IQueryable of Unknown Type from IList at Runtime

I have an IList of Type Entity.

I have a string representing the Type of a class derived from Entity.

I need to cast my IList to IQueryable of the Type derived from Entity using the string.

Sadly, the assembly for Entity and derived classes is not the executing assembly.

Upvotes: 1

Views: 1968

Answers (2)

alexb
alexb

Reputation: 971

Here is the approach with dynamic linq and reflection

var list = new List<Company>()
{
    new Company { Foo = "1", NoEmployees = 1 },
    new Company { Foo = "3", NoEmployees = 3 }
};

MethodInfo method = typeof(Queryable).GetMethods().Where(x => x.Name == "AsQueryable" && x.IsGenericMethod).First();
MethodInfo generic = method.MakeGenericMethod(new Type[] { Type.GetType(typeString) });

var queryable = (IQueryable)generic.Invoke(null, new object[] { list });

var result = queryable.Select("new (NoEmployees)").Where("NoEmployees > 2").OfType<object>().ToList();

Pls be more explicit next time

Upvotes: 1

Greg B
Greg B

Reputation: 426

Please provide more information, this is the only thing I can think of that might be what you want.

var queryable = new List<dynamic>();
foreach(var entity in IList<Entity>)
{
    dynamic companyProfile = Convert.ChangeType(entity, Type.GetType(typeString));
    if (companyProfile.CompanyProfileId == "something")
        queryable.Add(companyProfile);
    // Do Stuff
}
// Do Stuff

Upvotes: 0

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