属性的字符串长度 [英] String Length for properties

问题描述

嗨 如您在T-SQL中可能知道的那样，您可以为字符串/文本类型列指定长度，例如nvarchar(100).我想为C#类中的字符串分配最大长度.

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.

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

如何为字符串分配最大长度?

谢谢！

How can I assign a maximum length for strings?

Thank you!

推荐答案

好，

您可以为此做一个课程，

Ok,

You can Make a class for it,

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;
    }
}

现在，将属性定义为LenghtString:

Now, define your properties as LenghtString :

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

因此，您可以对其进行测试:

So, You may test it :

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);

祝你好运

Good Luck

将逻辑放入属性内.

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;
      }
}

我希望这对您有用.

I hope this works for you.

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