/// <summary>
/// happyhippy Extension:将原集合转换为目标集合
/// </summary>
/// <typeparam name="TResult"></typeparam>
/// <param name="source"></param>
/// <returns></returns>
public static List <TResult> ConvertTo <TResult>(this IEnumerable source)
where TResult : new()
{
if (source == null) //啥都不用干
{
return(null);
}
if (source is IEnumerable <TResult> )
{
return(source.Cast <TResult>().ToList());//源类型于目标类型一致，可以直接转换
}
List <TResult> result = new List <TResult>();
bool hasGetElementType = false;
IEnumerable <CommonProperty> commonProperties = null; //公共属性(按属性名称进行匹配)
foreach (var s in source)
{
if (!hasGetElementType) //访问第一个元素时，取得属性对应关系；后续的元素就不用再重新计算了
{
if (s is TResult) //如果源类型是目标类型的子类，可以直接Cast<T>扩展方法
{
return(source.Cast <TResult>().ToList());
}
commonProperties = PropertyCache.GetCommonProperties(s.GetType(), typeof(TResult));
hasGetElementType = true;
}
TResult t = new TResult();
foreach (CommonProperty commonProperty in commonProperties) //逐个属性拷贝
{
object value = commonProperty.SourceProperty.GetValue(s, null);
commonProperty.TargetProperty.SetValue(t, value, null);
}
result.Add(t);
}
return(result);
}
