//从本地文件读取数据
public static async Task <bool> LoadFromFile()
{
_data = await StorageFileHelper.ReadAsync <string>("HeroesAttrCache.dota");
return(_data != null);
}
//保存英雄属性数据到本地
public static async void SaveToFile()
{
await StorageFileHelper.WriteAsync(_data, "HeroesAttrCache.dota");
}