C#

Nader Elshehabi wrote:

Abstract classes uses only static methods and fields

Nader Elshehabi wrote:

You can't instantiate them

Nader Elshehabi wrote:

and how could your inherited class have a "parent"?

Nader Elshehabi wrote:

I can't really think of a way to solve it "this way". But eigther your put only static methods and fields in your base class, or remove the abstraction?

public abstract Setting
{
    protected void Init(...)
    {
        Initialise the base class members here.
    }
}
 
public CollectionSetting
{
    public CollectionSetting(...)
    {
        base.Init(...);
    }
}

public abstract class BaseClass {
    protected string name;
    public BaseClass(string name) {
        this.name = name;
    }
}
public class ChildClass : BaseClass {
    public ChildClass(string name) : base(name) {
    }
}

public abstract class Setting {
}

public class SimpleSetting : Setting {
    private Setting parent;
    public SimpleSetting() {
    }
    public SimpleSetting(Setting parent) {
        this.parent = parent;
    }
}
public class CollectionSetting : Setting {
    private Setting parent;
    public CollectionSetting(Setting parent) {
        this.parent = parent;
    }
}

public class Test {
    static void Main(string[] args) {
        Setting s = new CollectionSetting(new SimpleSetting());
    }
}

BoneSoft wrote:

you can have constructors on abstract classes, inheriting classes can access them. It's not the best practice, because then all inheriting class must have a constructor with matching signature, but you can do it.

innocent73 wrote:

Dear friends is it really impossible to insert or update a smalldatetime column?

innocent73 wrote:

" MaintEntryDate =Convert.ToDateTime(cMaintEntry.Text)";

innocent73 wrote:

And unfortunately the result was not ok.

innocent73 wrote:

(@PlateNumber_1 [char],

innocent73 wrote:

[char](20),

innocent73 wrote:

How can I send a smalldate parameter from c# to SQL server

DateTime theDate = new DateTime(2006,06,19);
SqlCommand cmd = new SqlCommand();
cmd.CommandText = "SELECT * FROM MyTable Where [date] = @someDate";
cmd.Parameters.Add("@someDate", theDate);
...

Nader Elshehabi wrote:

We all know that queries are only text, so if you want to pass a date to SQL server, you should pass it as a text. And why not?