String Length for properties

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4.75/5 (4 votes)

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Hi as you may probably know in T-SQL one can assign a length for string/text type columns, for example nvarchar(100). I want to assign a maximum length for my strings in C# classes.

SQL

public class Customer
{
    public string Name { get; set; }
    public string Address { get; set; }
}

How can I assign a maximum length for strings?

Thank you!

Posted 16-Jan-11 9:00am

mariazingzing

Updated 16-Jan-11 10:54am

Manfred Rudolf Bihy

v3

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Manfred Rudolf Bihy 16-Jan-11 15:20pm

You should consider marking the answers below as "Accepted" as they provided you with a working solution.
This is the way people are rewared here at CP for giving solutions to problems others post here.
If an answer is good vote (5) for it and if it solves your problem also mark it as accepted.
Thanks for your attention!

#realJSOP 16-Jan-11 15:58pm

You should also consider NOT texting. You have plenty of time to type the entire word "you", and "for" instead of 4.

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Shahin Khorshidnia · Accepted Answer · 2011-01-16T09:06:00

Ok,

You can Make a class for it,

C#

public class LenghtString
{
    public int Lenght { get; set; }

    private string _Value;
    public string Value
    {
        get
        {
            return _Value;
        }
        set
        {
            _Value = value;
            if (_Value.Length > Lenght && Lenght != -1)
            {
                _Value = _Value.Substring(0, Lenght);
            }
        }
    }

    public LenghtString()
        : this(-1)
    {
    }

    public LenghtString(int lenght)
        : this(lenght, string.Empty)
    {
    }

    public LenghtString(string value)
        : this(1, value)
    {
    }

    public LenghtString(int lenght, string value)
    {
        Lenght = lenght;
        Value = value;
    }
}

Now, define your properties as LenghtString :

SQL

public class Customer
{
    public LenghtString Name { get; set; }
    public LenghtString Address { get; set; }
}

So, You may test it :

C#

Customer c = new Customer()
{
   Name = new LenghtString(20,"Shahin Khorshidia"),
   Address = new LenghtString(50, "Bla Bla Bla Bla Bla Bla Bla Bla Bla Bla Bla Bla Bla Bla Bla Bla Bla Bla ...")
};

Console.WriteLine("{0} {1}",c.Name.Value, c.Address.Value);

Good Luck

Abhishek Sur · Accepted Answer · 2011-01-16T09:04:00

Solution 1

Place the logic inside the property.

public string Name
{
  get { return this._name; }
  set 
  { 
        if(value.Length > MAXLEN) 
           this._name = value.Substring(0, Math.Min(value.Length, MAXLEN));
        else this._name = value;
      }
}

I hope this works for you.

Posted 16-Jan-11 9:04am

Abhishek Sur

Comments

mariazingzing 16-Jan-11 15:10pm

Thank u for fast answering.

Manfred Rudolf Bihy 16-Jan-11 15:21pm

Good call! 5+

fjdiewornncalwe 16-Jan-11 16:40pm

+5.. Wow. Shahin's answer was my first thought, this was my second. You guys are reading my mind. Well Done.

thatraja 16-Jan-11 22:49pm

Good answer Abhishek