I have a method that uses a list which I need to pass into it.
Depending on where I call this method the type of the list is different.
Is it possible to pass the list in as a generic list and then cast it to a certain type, or do I need to create parameters for every type of list that can be used (see below)?
public string MyMethod(List<Type1> list1, List<Type2> list2, ...etc )
{
switch(someCondition)
{
case 1:
//pass list1 into a method from class1
break;
case 2:
//pass list2 into a method from class2
break;
...//etc for several more lists
}
Instead of making a single method with multiple parameters, why don't you make several methods with a single List type? It seems you are not sharing much code from one List type to another anyway.
public string MyMethod(List<int> list)
{
//do something with list
}
public string MyMethod(List<bool> list)
{
//do something with list1
}
...
you can create a generic function that accepts generic type like this
public virtual List<T> SelectRecord <T>(int items, IEnumerable<T> list)
{
if (items == -1)
return list.ToList<T>();
else
if (items > list.Count<T>())
return list.ToList<T>();
else
return list.Take<T>(items).ToList<T>();
}
In my example I passed a IEnumerable to my function and it returns a List (where is the type of my object). I don't specify what is the type of the object.
I hope it's helpful.
You could do something like this:
class GenericsExample1Class<T>
{
public string WhatsTheType(List<T> passedList)
{
string passedType = string.Empty;
passedType = passedList.GetType().ToString();
return passedType;
}
}
private void ClienMethod()
{
string typeOfTheList = string.Empty;
// Call Type 1: Value Type
List<int> intergerObjectList = new List<int> { 1, 2 };
typeOfTheList = (new GenericsExample1Class<int>()).WhatsTheType(intergerObjectList);
MessageBox.Show(typeOfTheList);
// Call Type 2: Reference Type
List<string> stringObjectList = new List<string> { "a", "b" };
typeOfTheList = (new GenericsExample1Class<string>()).WhatsTheType(stringObjectList);
MessageBox.Show(typeOfTheList);
// Call Type 2: Complex-Reference Type
List<Employee> complexObjectList = new List<Employee> { (new Employee { Id = 1, Name = "Tathagat" }), (new Employee { Id = 2, Name = "Einstein" }) };
typeOfTheList = (new GenericsExample1Class<Employee>()).WhatsTheType(complexObjectList);
MessageBox.Show(typeOfTheList);
}
Thanks for all the answers.
Another solution I just discovered would be to use a new feature in C# 4.0:
public string MyMethod(List<Type1> list1 = null, List<Type2> list2 = null, ...etc )
{
switch(someCondition)
{
case 1:
//pass list1 into a method from class1
break;
case 2:
//pass list2 into a method from class2
break;
...//etc for several more lists
}
}
Then I could just call the method like so and not have to specify all the parameters:
MyMethod(list1: mylist1)
Yes, this can be done easly by passing parameter with Object type, as shown below:
public void Test(int SomeCondition,Object Param)
{
dynamic list;
switch (SomeCondition)
{
case 0:
list = (List<int>)Param;
MessageBox.Show(list[0].ToString());
break;
case 1:
list = (List<string>)Param;
MessageBox.Show(list[0].ToString());
break;
default:
MessageBox.Show("Default!");
break;
}
}
You can call this function this way:
List<int> list1 = new List<int>(new int[]{1,2,3});
List<string> list2 = new List<string>(new string[] { "one", "two", "three"});
Test(0, list1);
Test(1, list2);
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