C# 特性的使用
using ClassLibrary;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace AttributeExam
{
class Program
{
private static readonly StringBuilder outputText = new StringBuilder(1000);
private static DateTime backDateTo = new DateTime(2010, 2, 1);
static void Main(string[] args)
{
Assembly theAssembly = Assembly.Load("VectorLibrary");
Attribute supportsAttribute =
Attribute.GetCustomAttribute(
theAssembly, typeof(SupportsWhatsNewAttribute));
string name = theAssembly.FullName;
AddToMessage("Assembly: " + name);
if (supportsAttribute == null)
{
AddToMessage(
"This assembly does not support WhatsNew attributes");
return;
}
else
{
AddToMessage("Defined Types:");
}
Type[] types = theAssembly.GetTypes();
foreach (Type definedType in types)
DisplayTypeInfo(definedType);
MessageBox.Show(outputText.ToString(),
"What\'s New since " + backDateTo.ToLongDateString());
Console.ReadLine();
}
private static void DisplayTypeInfo(Type type)
{
// make sure we only pick out classes
if (!(type.IsClass))
return;
AddToMessage("\nclass " + type.Name);
Attribute[] attribs = Attribute.GetCustomAttributes(type);
if (attribs.Length == 0)
AddToMessage("No changes to this class");
else
foreach (Attribute attrib in attribs)
WriteAttributeInfo(attrib);
MethodInfo[] methods = type.GetMethods();
AddToMessage("CHANGES TO METHODS OF THIS CLASS:");
foreach (MethodInfo nextMethod in methods)
{
object[] attribs2 =
nextMethod.GetCustomAttributes(
typeof(LastModifiedAttribute), false);
if (attribs2 != null)
{
AddToMessage(
nextMethod.ReturnType + " " + nextMethod.Name + "()");
foreach (Attribute nextAttrib in attribs2)
WriteAttributeInfo(nextAttrib);
}
}
}
private static void WriteAttributeInfo(Attribute attrib)
{
LastModifiedAttribute lastModifiedAttrib =
attrib as LastModifiedAttribute;
if (lastModifiedAttrib == null)
return;
// check that date is in range
DateTime modifiedDate = lastModifiedAttrib.DateModified;
if (modifiedDate < backDateTo)
return;
AddToMessage(" MODIFIED: " +
modifiedDate.ToLongDateString() + ":");
AddToMessage(" " + lastModifiedAttrib.Changes);
if (lastModifiedAttrib.Issues != null)
AddToMessage(" Outstanding issues:" +
lastModifiedAttrib.Issues);
}
private static void AddToMessage(string message)
{
outputText.Append("\n" + message);
}
}
}
using ClassLibrary;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
[assembly: SupportsWhatsNew]
namespace VectorLibrary
{
[LastModified("14 Feb 2010", "IEnumerable interface implemented " +
"So Vector can now be treated as a collection")]
[LastModified("10 Feb 2010", "IFormattable interface implemented " +
"So Vector now responds to format specifiers N and VE")]
public class Vector:IFormattable,IEnumerable
{
public double x, y, z;
public Vector(double x, double y, double z)
{
this.x = x;
this.y = y;
this.z = z;
}
[LastModified("10 Feb 2010", "Method added in order to provide formatting support")]
public string ToString(string format, IFormatProvider formatProvider)
{
if (format == null)
return ToString();
string formatUpper = format.ToUpper();
switch (formatUpper)
{
case "N":
return "|| " + Norm().ToString() + " ||";
case "VE":
return String.Format("( {0:E}, {1:E}, {2:E} )", x, y, z);
case "IJK":
StringBuilder sb = new StringBuilder(x.ToString(), 30);
sb.Append(" i + ");
sb.Append(y.ToString());
sb.Append(" j + ");
sb.Append(z.ToString());
sb.Append(" k");
return sb.ToString();
default:
return ToString();
}
}
public Vector(Vector rhs)
{
x = rhs.x;
y = rhs.y;
z = rhs.z;
}
[LastModified("14 Feb 2010", "Method added in order to provide collection support")]
public IEnumerator GetEnumerator()
{
return new VectorEnumerator(this);
}
public override string ToString()
{
return "( " + x + " , " + y + " , " + z + " )";
}
public double this[uint i]
{
get
{
switch (i)
{
case 0:
return x;
case 1:
return y;
case 2:
return z;
default:
throw new IndexOutOfRangeException(
"Attempt to retrieve Vector element" + i);
}
}
set
{
switch (i)
{
case 0:
x = value;
break;
case 1:
y = value;
break;
case 2:
z = value;
break;
default:
throw new IndexOutOfRangeException(
"Attempt to set Vector element" + i);
}
}
}
public static bool operator ==(Vector lhs, Vector rhs)
{
if (System.Math.Abs(lhs.x - rhs.x) < double.Epsilon &&
System.Math.Abs(lhs.y - rhs.y) < double.Epsilon &&
System.Math.Abs(lhs.z - rhs.z) < double.Epsilon)
return true;
else
return false;
}
public static bool operator !=(Vector lhs, Vector rhs)
{
return !(lhs == rhs);
}
public static Vector operator +(Vector lhs, Vector rhs)
{
Vector result = new Vector(lhs);
result.x += rhs.x;
result.y += rhs.y;
result.z += rhs.z;
return result;
}
public static Vector operator *(double lhs, Vector rhs)
{
return new Vector(lhs * rhs.x, lhs * rhs.y, lhs * rhs.z);
}
public static Vector operator *(Vector lhs, double rhs)
{
return rhs * lhs;
}
public static double operator *(Vector lhs, Vector rhs)
{
return lhs.x * rhs.x + lhs.y + rhs.y + lhs.z * rhs.z;
}
public double Norm()
{
return x * x + y * y + z * z;
}
[LastModified("14 Feb 2010", "Class created as part of collection support for Vector")]
private class VectorEnumerator : IEnumerator
{
readonly Vector _theVector; // Vector object that this enumerato refers to
int _location; // which element of _theVector the enumerator is currently referring to
public VectorEnumerator(Vector theVector)
{
_theVector = theVector;
_location = -1;
}
public bool MoveNext()
{
++_location;
return (_location > 2) ? false : true;
}
public object Current
{
get
{
if (_location < 0 || _location > 2)
throw new InvalidOperationException(
"The enumerator is either before the first element or " +
"after the last element of the Vector");
return _theVector[(uint)_location];
}
}
public void Reset()
{
_location = -1;
}
}
}
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ClassLibrary
{
[AttributeUsage(AttributeTargets.Class|AttributeTargets.Method,
AllowMultiple=true,
Inherited=false)]
public class LastModifiedAttribute:Attribute
{
private readonly DateTime _dateModified;
public DateTime DateModified
{
get { return _dateModified; }
}
private readonly string _changes;
public string Changes
{
get { return _changes; }
}
public string Issues { get; set; }
public LastModifiedAttribute(string dateModified, string changes)
{
_dateModified = DateTime.Parse(dateModified);
_changes = changes;
}
}
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ClassLibrary
{
[AttributeUsage(AttributeTargets.Assembly)]
public class SupportsWhatsNewAttribute:Attribute
{
}
}
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