Is it possible to cast the whole object using DataBinder.Eval() instead of casting it by property. e.g.:
// instead of this
var p = new Person();
p.FirstName = Convert.ToBoolean(DataBinder.Eval(Container.DataItem, "FirstName"));
p.Age = Convert.ToInt32(DataBinder.Eval(Container.DataItem, "Age"));
...
// use something like this in one step
var p = DataBinder.Eval<Person>(Container.DataItem);
Related
I want to avoid writing these three lines over and over in different functions.
var newState = state.copy();
newState.user.googleUser = googleUser;
state = newState;
Something like this?
state = (state.copy().user.googleUser = googleUser);
Use the cascade operator:
state = state.copy()..user.googleUser = googleUser;
Alternatively, a common pattern is to instead create a copyWith method for your classes so that you can do:
state = state.copyWith(user: googleUser);
In JavaScript you can do the following:
var obj = {
property: 1,
method1: function() {
//...
},
method2: function() {
//...
}
};
obj.method1()
I am wondering if there is a groovy equivalent for this (a map containing a method). I know this is just like a class, but I dont want a class ha..
Yes, you can put closures inside a map. But this is not the way to get
objects in Groovy. There is no concept of "this", that knows about the
map.
def obj = [
inc: { it + 1 }
]
println obj.inc(10)
Ok so Javascript is not OOP. They have OBJECTS but that is it. What you are showing is an OBJECT.
In Groovy, you can do this with a class that can instantiate the object and then you can do that on the object. For example you can create a CommandObject (which is what you are probably wanting) and then fill in the properties like you want or fill them in on instantiation. For example (using above example):
def paramsDesc = new ParamsDescriptor()
paramsDesc.paramType = 'paramtype'
paramsDesc.keyType = 'keyType'
paramsDesc.name = 'name'
paramsDesc.idReferences = 'id'
paramsDesc.description = 'desc'
paramsDesc.mockData = 'mock'
paramsDesc.values = []
OR (if you create a constructor) you can instantiate all at once:
def paramsDesc = new ParamsDescriptor('paramtype','keyType','name','id','desc','mock',[])
CommandObjects can have methods and functions (like above). But you just have to instantiate them first (def paramsDesc = new ParamsDescriptor())
This is the difference between a class and an object; think of a class as the blueprint and the object as what is created from the blueprint.
I'm using: ASP.NET MVC, MySql, Dapper.NET micro-orm
I made a stored procedure with 3 SELECTs, two of which returns lists and the third one returns an integer.
Here is my code:
using (var conn = new MySqlConnection(GetConnectionString()))
{
var readDb = conn.QueryMultiple(storedProcedure, parameters, commandType: CommandType.StoredProcedure);
var result = new someView
{
TopicsList = readDb.Read<ITopic>().ToList(),
TopTopicsList = readDb.Read<IMessage>().ToList(),
TopicsCount = readDb.Read<int>().Single()
};
return result;
}
In ITopic I have TopicId, in IMessage I have MessageId.
And here's the error:
When using the multi-mapping APIs ensure you set the splitOn param if you have keys other than Id Parameter name: splitOn
I tried adding splitOn on both QueryMultiple and Read, and nigher accepted it.
Though I dont understand why I need splitOn? can't dapper see that I have three separate SELECTs? When using conn.Read(storedProcedure,parameters) on each of the selects separately (instead of MultipleQuery on all of the together) dapper has no problem mapping it to a given object.
What am I doing wrong?
1) Problem solved when I used the real models names instead of their interfaces names:
TopicView instead of ITopic, TopTopicsView instead of IMessage;
2) Once that was fixed and there was no longer "no splitOn" error, started another problem with the < int > casting in line:
TopicsCount = readDb.Read<int>().Single()
probably mysql doesnt return numbers back as ints?
I tried using decimal, object, dynamic, etc.. with no luck. Eventually fixed it by creating another Model with int property inside that has the same name as the database int parameter and now it works.
3) Here's the final working code:
using (var conn = new MySqlConnection(GetConnectionString()))
{
var parameters = context.MapEntity(query);
var multi = conn.QueryMultiple(storedProcedure, parameters, commandType: System.Data.CommandType.StoredProcedure);
var TopicsList = multi.Read<TopicView>().ToList();
var TopTopicsList = multi.Read<TopTopicsView>().ToList();
var result = multi.Read<HomeView>().Single();
result.TopicsList = TopicsList;
result.TopTopicsList = TopTopicsList;
return result;
}
Some background
I'm wanting to bind a list of objects (my model-view) to a grid. The model-view contains fields for both an specific entity and fields from a joined entity.
I was getting an error when I would try to bind due to the dbContext being out of scope. I realized I needed to use the .Include() method in order to eager load my navigation property. However, I suspect that since I'm using Linq to Entities, that I'm now generating another error:
"Unable to cast the type 'System.Linq.IQueryable1' to type 'System.Data.Objects.ObjectQuery1'. LINQ to Entities only supports casting EDM primitive or enumeration types."
My code is shown below, any ideas of what I need to do here?
Thanks in advance!
public static List<PlanViewModel> GetPlans()
{
using (var context = new RepEntities())
{
var query = (from p in context.Plans
join r in context.RealEstateDetails on p.ReId equals r.ReId
select new PlanViewModel
{
PlanName = p.PlanName,
TargetCompletionDate = p.TargetCompletionDate,
ActualCompletionDate = p.ActualCompletionDate,
Provision = p.Provision,
StatusTypeId = p.StatusTypeId,
StatusCommon = p.StatusCommon,
Building = r.BuildingName,
City = r.City,
Country = r.Country
}).Include("StatusCommon");
return query.ToList();
}
}
You are almost there, just put Include("StatusCommon") right after context.Plans. Because you need to include StatusCommon before the iteration, this way you can set StatusCommon value for every iteration.
public static List<PlanViewModel> GetPlans()
{
using (var context = new RepEntities())
{
var query = (from p in context.Plans.Include("StatusCommon")
join r in context.RealEstateDetails on p.ReId equals r.ReId
select new PlanViewModel
{
PlanName = p.PlanName,
TargetCompletionDate = p.TargetCompletionDate,
ActualCompletionDate = p.ActualCompletionDate,
Provision = p.Provision,
StatusTypeId = p.StatusTypeId,
StatusCommon = p.StatusCommon,
Building = r.BuildingName,
City = r.City,
Country = r.Country
}).toList();
return query;
}
}
I have two objects of same Type and I want to swap A for B. Instead of using this:
var tmp = A.prop1;
A.prop1 = B.prop1;
B.prop1 = tmp; ....
ctx.SaveChanges();
Is there any faster way?