CODEWITHSUNDEEP
c#methodstypes
sooprise
sooprise

Reputation: 23187

Sending DataType As An Argument?

I'm trying to write a method that uses the following two arguments:

ColumnToSort
ColumnType

The reason I want to be able to do this is interpreting two things as a string can give a different result than comparing the same two things as a number. For example

String: "10" < "2"
Double: 10 > 2

So basically, I want to be able to send double or string datatype as a method argument, but I don't know how to do this, but it seems like something that should be possible in C#.

Addendum:

What I want my method to look like:

InsertRow(customDataObj data, int columnToSort, DataType dataType){
    foreach(var row in listView){
        var value1 = (dataType)listView.Items[i].SubItems[columnToSort];
        var value2 = (dataType)data.Something;
        //From here, it will find where the data object needs to be placed in the ListView and insert it
    }
}

How it will be called:

I think the above provides enough of an explanation to understand how it will be called, if there are any specific questions, let me know.

Upvotes: 5

Views: 7914

Answers (3)

Brook
Brook

Reputation: 6009

You might consider using generics.

InsertRow<T>(T data, int columnToSort){
    foreach(var row in listView){
        var value1 = (T)listView.Items[columnToSort].SubItems[columnToSort];
        var value2 = data;
        //From here, it will find where the data object needs to be placed in the ListView and insert it
        if(typeof(T)==typeof(string))
        {
          //do with something wtih data
        }
        else if(typeof(T)==typeof(int))
        {
          //do something else
        }
    }
}

Then call it, and let it figure out the type by itself.

int i=1;
InsertRow(i,/*column/*);

You may also want to restrict what T can be, for instance if you want to make sure it's a value type, where T:struct More

Upvotes: 1

Cos Callis
Cos Callis

Reputation: 5084

Just pass a reference to the Column itself like this:

 protected void DoSort(DataColumn dc)
      {
         string columnName = dc.ColumnName;
         Type type = dc.DataType;
      }

Cheers, CEC

Upvotes: 0

Bala R
Bala R

Reputation: 108947

You can use Type as parameter type. like this

void foo(object o, Type t)
{
 ...
}

and call

Double d = 10.0;
foo(d, d.GetType());

or

foo(d, typeof(Double));

Upvotes: 6

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