Hashtable的用法

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这个例子演示了Hashtable的用法，例子比较简单，主要是下面两个类的一些方法的override：

--------------------------------------------------

public class EmployeeID
{
private readonly char prefix;
private readonly int number;

public EmployeeID( string id )
{
prefix = (id.ToUpper())[0];
number = int.Parse ( id.Substring(1,3) );
}

public override string ToString()
{
return prefix.ToString () + string.Format( "{0,3:000}",number );
}

public override int GetHashCode()
{
return this.ToString().GetHashCode();
}

public override bool Equals(object obj)
{
EmployeeID rhs = obj as EmployeeID ;
if( rhs == null )
return false;
if( prefix == rhs.prefix && number == rhs.number )
return true;
return false;
}

}


--------------------------------------------------

public class EmployeeData
{
private string name;
private decimal salary;
private EmployeeID id;

public EmployeeData( EmployeeID id, string name, decimal salary)
{
this.id = id;
this.name = name;
this.salary = salary;
}

public override string ToString()
{
StringBuilder sb = new StringBuilder( id.ToString(), 100 );
sb.Append (": ");
sb.Append ( string.Format( "{0,-20}", name));
sb.Append (" ");
sb.Append (string.Format ( "{0:C}",salary));
return sb.ToString ();
}

}

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