Ahjesusカスタム属性Attributeまたは属性の名前を取得
15653 ワード
1:独自のカスタム属性を設定する
2:属性または属性名を取得するクラスを設定する
3:テストエンティティクラスと列挙の設定
4:テスト開始
public class NameAttribute:Attribute {
private string _description;
public NameAttribute(string description) {
_description = description;
}
public string Description {
get { return _description; }
}
}2:属性または属性名を取得するクラスを設定する
/// <summary>
/// Name
/// </summary>
/// <typeparam name="T"> </typeparam>
public class AttributeHelper<T> where T : new() {
/// <summary>
/// Name
/// </summary>
/// <param name="type"> </param>
/// <returns></returns>
public string NameFor(object type) {
T test = (T)type;
FieldInfo fieldInfo = test.GetType().GetField(test.ToString());
object[] attribArray = fieldInfo.GetCustomAttributes(false);
//IList<CustomAttributeData> list = fieldInfo.GetCustomAttributesData();
string des = (attribArray[0] as NameAttribute).Description;
return des;
}
/// <summary>
/// Name
/// </summary>
/// <param name="predicate"> </param>
/// <returns></returns>
public string NameFor(Expression<Func<T, object>> expr) {
string name = PropertyNameFor(expr);
T et = new T();
Type type = et.GetType();
PropertyInfo[] properties = type.GetProperties();
object[] attributes = null;
foreach (PropertyInfo p in properties) {
if (p.Name == name) {
attributes = p.GetCustomAttributes(typeof(NameAttribute), true);
break;
}
}// http://www.cnblogs.com/ahjesus , , !
string des = ((NameAttribute)attributes[0]).Description;
return des;
}
/// <summary>
///
/// </summary>
/// <param name="expr"></param>
/// <returns></returns>
public string PropertyNameFor(Expression<Func<T, object>> expr) {
var rtn = "";
if (expr.Body is UnaryExpression) {
rtn = ((MemberExpression)((UnaryExpression)expr.Body).Operand).Member.Name;
}// http://www.cnblogs.com/ahjesus , , !
else if (expr.Body is MemberExpression) {
rtn = ((MemberExpression)expr.Body).Member.Name;
}
else if (expr.Body is ParameterExpression) {
rtn = ((ParameterExpression)expr.Body).Type.Name;
}
return rtn;
}
}3:テストエンティティクラスと列挙の設定
public class MyEntity {
public MyEntity() {
Name = "Jude";
Age = 11;
}
[Name(" ")]
public string Name { get; set; }
[Name(" ")]
public int Age { get; set; }
} public enum MyEnum {
[Name(" ")]
Europe = 0,
[Name(" ")]
Asia = 1,
[Name(" ")]
America = 2
}4:テスト開始
public partial class WebForm1 : System.Web.UI.Page {
protected void Page_Load(object sender, EventArgs e) {
AttributeHelper<MyEntity> myEntityAttr = new AttributeHelper<MyEntity>();
MyEntity myEntity = new MyEntity();
AttributeHelper<MyEnum> myEnumAttr = new AttributeHelper<MyEnum>();
Response.Write(myEntityAttr.NameFor(it => it.Name) + ":" + myEntity.Name + "
");// :Jude
Response.Write(myEntityAttr.NameFor(it => it.Age) + ":" + myEntity.Age + "
");// :11
Response.Write(myEntityAttr.PropertyNameFor(it => it.Name) + ":" + myEntity.Name + "
");//Name:Jude
Response.Write(myEntityAttr.PropertyNameFor(it => it.Age) + ":" + myEntity.Age + "
");//Age:11
// http://www.cnblogs.com/ahjesus , , !
Response.Write(myEnumAttr.NameFor(MyEnum.America) + ":" + MyEnum.America + "
");// :America
Response.Write(myEnumAttr.NameFor(MyEnum.Asia) + ":" + MyEnum.Asia + "
");// :Asia
Response.Write(myEnumAttr.NameFor(MyEnum.Europe) + ":" + MyEnum.Europe + "
");// :Europe
}
}