C # is cast

In peacetime development, often encounter a forced conversion, in this process often encountered a null object to the value type, if not judged in the case of the compilation will not be error, but the program is run to throw an error. Fortunately, C # provides us with the IS, which determines if an object is converted if it is formed, and returns null if it does not.

Here is an example of a specific application.

public partial class Org
{
public string OrgID {get; set;}
public string OrgName {get; set;}
public int? total{get; set;}

}

Class Program

{

static void Main (string[] args)

{

DataTable Tbldatas = new DataTable ("Datas");

DataColumn DC = null;

DC = TBLDATAS.COLUMNS.ADD ("ID", Type.GetType ("System.Int32"));

DC = TBLDATAS.COLUMNS.ADD ("OrgID", Type.GetType ("System.String"));

DC = TBLDATAS.COLUMNS.ADD ("OrgName", Type.GetType ("System.String"));

DC = TBLDATAS.COLUMNS.ADD ("Total", Type.GetType ("System.int"));

DataRow NewRow;

NewRow = Tbldatas.newrow ();

newrow["OrgID"] = "1";

newrow["OrgName"] = "Test";

newrow["Total"] = null;

TBLDATAS.ROWS.ADD (NewRow);

org org = new org ();

Org. total= tbldatas.rows[0]["Total"] as int?;

Console.WriteLine (org. Total);

}

}

In this program "org."    total= tbldatas.rows[0]["Total"] as int?; "Here is the cast, entity object public int?" total{get; set;} must be added here? No.

C # is cast