/// <summary>
/// 處理例外，回傳指定結果，只接受單一種方法
/// </summary>
/// <param name="target">目標例外</param>
/// <returns>處理結果</returns>
public virtual TResult HandleExceptionResult(Exception target)
{
Type exceptionType = target.GetType();
// 取得這個類別內掛上HandleException 且為回傳 TResult 的方法
MethodInfo method = this.GetType()
.GetMethods(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic)
.FirstOrDefault(m =>
{
HandleExceptionAttribute attribute = m.GetCustomAttribute <HandleExceptionAttribute>();
if (attribute == null)
{
return(false);
}
if (attribute.ExactExceptionType != null && !attribute.IsHandleParent)
{
return(attribute.ExactExceptionType == exceptionType &&
m.ReturnType == typeof(TResult));
}
return(attribute.ParentExceptionType != null &&
exceptionType.IsSubclassOf(attribute.ParentExceptionType) &&
m.ReturnType == typeof(TResult));
});
if (method != null)
{
return((TResult)method.Invoke(this, new object[] { target }));
}
return(this.GeneralHandleResult(target));
}
/// <summary>
/// 處理例外，不回傳值，可指定多種處理方法
/// </summary>
/// <param name="target">目標例外</param>
public virtual void HandleException(Exception target)
{
Type exceptionType = target.GetType();
// 取得這個類別內掛上HandleException 且為 void 的方法
List <MethodInfo> methods = this.GetType()
.GetMethods(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic)
.Where(m =>
{
HandleExceptionAttribute attribute = m.GetCustomAttribute <HandleExceptionAttribute>();
if (attribute == null)
{
return(false);
}
if (attribute.ExactExceptionType != null && !attribute.IsHandleParent)
{
return(attribute.ExactExceptionType == exceptionType &&
m.ReturnType == typeof(void));
}
return(attribute.ParentExceptionType != null &&
exceptionType.IsSubclassOf(attribute.ParentExceptionType) &&
m.ReturnType == typeof(void));
})
.ToList();
if (methods.Any())
{
methods.ForEach(m => m.Invoke(this, new object[] { target }));
}
else
{
this.GeneralHandle(target);
}
}
