理解接口和类的差异.

问题描述

protected void DepartmentName_SelectedIndexChanged(object o, Telerik.Web.UI.RadComboBoxSelectedIndexChangedEventArgs e)
        {
            try
            {
                ((ITransaction)AppVariables.automator.AccountObj).DepartmentID = WebFormHelper.GetAccountIDFromName(DepartmentName.Text, AccountType.departmentMaster);
                ((ITransaction)AppVariables.automator.AccountObj).DepartmentName = DepartmentName.Text;
            }

在上面的代码中，我不明白为什么我们采用了(ITransaction)，它称为/意味着(返回类型或其他任何东西)吗?
因为我已经在接口ITransaction中将属性声明为DepartmentID和DepartmentName并在Class Transaction中实现了它.

另外，我们可以在上面的代码段中使用Transaction而不是ITransaction吗?我试过了，它对我有用，但是，没有得到正确的答案(ITransaction或Transaction).

In above code i didnt get why we have taken (ITransaction),what it called/means(return type or anything else)??
as i have declared properties as DepartmentID and DepartmentName in interface ITransaction and implemented it in Class Transaction.

also, can we take Transaction instead of ITransaction in above snippet? i tried this, it works for me but , didnt get what will be correct there(ITransaction or Transaction).

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