casting at runtime in c#

[Simon_Whale]

Type t = typeof(Parent<>);
Type type = typeof(Data);

dynamic response = Activator.CreateInstance(t.MakeGenericType(type));
Data es = new Data() { Name = "Fred", value = 213 };
response.value = es;

public class Parent
{
public string name = string.Empty;
public T value;
}

public class Data
{
    public string Name = string.Empty;
    public int value = 0;
}

I have also tried it with the following and it still works can you expand your problem with some sample code? or a snippet?

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[prasadbuddhika]

Thanks again , ok then I think I have to focus on the deserialzed object , unfortunately i haven't got the code snippet right now , but I will definitely post that code snippet soon. thanks .

[Simon_Whale]

Your welcome :-D

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[prasadbuddhika]

hi , this is how i'm doing the deserialization

Type genericSyncObj = typeof(SyncObject<>);
Type syncObj = genericSyncObj.MakeGenericType(type);
IList customObjectList = (IList)Activator.CreateInstance((typeof(List<>).MakeGenericType(type)));

foreach (string value in pullRequest.Knowledge)
{
dynamic syncObject = JasonSerializer.Deserialize(value, syncObj, null);
customObjectList.Add(syncObject.Object);
}

and i'm getting the exception at here

dynamic responseSync = Activator.CreateInstance(typeof(SyncObject<>).MakeGenericType(type));
responseSync.Object = customObjectList[y] ;

thanks .

[Simon_Whale]

The problem is that customObject[y] is returned as an object which is why it fails. if you then hard code a cast such as for example.

//assume SomeTestClass is the type of class that you are using
//Type type = typeof(SomeTestClass);
responseSync.Object = (SomeTestClass)customObject[y];

it works as you need it to do, but how to create this as a generic routine I'm not sure at the moment as (typeof(SomeTestClass))customObject[y] or even (typeof(SomeTestClass))CustomObject[y] is rejected by the compiler.

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[prasadbuddhika]

thanks , yes this is the place where i'm stuck , need to cast in runtime , if you find a way please share it .

[Simon_Whale]

//Create sample data in the same method as OP
IList datalist = (IList)Activator.CreateInstance(typeof(List<>).MakeGenericType(typeof(Data)));

datalist.Add(new Data {Name = "SIMON", value = 1});
datalist.Add(new Data {Name = "SIMON", value = 2});
datalist.Add(new Data {Name = "SIMON", value = 3});

//Create the destination object that is declared using
//the dynamic keyword
Type t = typeof(Parent<>);
Type type = typeof(Data);

dynamic response = Activator.CreateInstance(t.MakeGenericType(type));

//************ possible work around not sure if it would be a correct way
//************ but it works.

Type SingleRecordType = datalist[0].GetType();
dynamic Destination = Activator.CreateInstance(SingleRecordType);
Desintation = datalist[0];

//Add the record to the response object
response.value = Desintation;

have a look at this. it is a bit of a work around converting the list item from object to a specific type at runtime. Thanks Simon **edit** missed a GetType()

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[BobJanova]

If you're getting a runtime exception, then it's probably because the object actually isn't of the right type. The exception message should tell you what it is and what it's trying to cast it to.

[prasadbuddhika]

hi thanks it seems to be working, though it is a workaround . thanks for the clue . ** yes i noticed that and i fixed it by calling the GetType() thanks.

[prasadbuddhika]

hi , yes , that's the case , I was searching for a way to solve this at runtime. anyway I got a clue a from Simon_Whale. thanks.