如何将坐标列表保存到独立存储? [英] How to save a list of coordinates to isolated storage?

问题描述

我有一个地理坐标列表，我想在应用程序关闭时将其保存到存储中，但我不确定如何将其保存到存储中.

I have a GeoCoordinate list that I want to save to storage when the application is closed, but I'm not sure how to save it to storage.

我尝试使用此处找到的帮助程序类保存列表 在独立存储中存储对象列表的问题 但我认为我的语法可能是错误的，因为我不熟悉使用列表.这就是我尝试保存列表的方式.任何人都可以通过保存点亮来为我指明正确的方向吗?

I tried saving the list using a helper class found here problem Storing a list of Objects in Isolated Storage but I think my syntax may be wrong in saving it as I'm new to using lists.This is how I tried to save the list. Can anyone point me in the right direction with saving the lit?

mycoord = Isolated_Storage_Helper.IsoStoreHelper
                                 .SaveList<mycoord>("Storage_Folder/", "Storage");

它给了我一个错误，指出 mycoord 是一个字段，但用作类型

It gives me an error stating that mycoord is a field but is used as a type

mycoord 是在全局级别创建的坐标列表:

mycoord is a list of coordinates created at a global level:

Listmycoord = new List();

并填充到 OnNavigatedTo 方法中:

And populated in the OnNavigatedTo method:

protected override void OnNavigatedTo(NavigationEventArgs e)
{
    if (NavigationContext.QueryString.ContainsKey("GeoLat") &&  
        NavigationContext.QueryString.ContainsKey("GeoLong") &&  
        NavigationContext.QueryString.ContainsKey("pName"))
    {
        if (mycoord.Count >= 2)
        {
            //do something,draw route between points
            return;
        }
        else
        {
            var latitude = Convert.ToDouble(NavigationContext.QueryString["GeoLat"]);
            var longtitude = Convert.ToDouble(NavigationContext.QueryString["GeoLong"]);
            var MyGeoPosition = new GeoCoordinate(latitude, longtitude);
            var pushPinName = NavigationContext.QueryString["pName"];
            DrawPushPin(MyGeoPosition, pushPinName);
            mycoord.Add(MyGeoPosition);
        }
    }
    base.OnNavigatedTo(e);
}

推荐答案

首先创建坐标类:

[DataContract]
class coord{
    [DataMember]
    public double lat{get;set;}
    [DataMember]
    public double lon{get;set;}
}

现在如果你想保存一个List你可以这样做:

Now if you want to save a List<coord> You may do:

DataContractSerializer ser = new DataContractSerializer(typeof(List<coord>));
ser.WriteObject(any_file_stream, instance_of_List<coord>);

但是如果你只想保存几个坐标，而不是一个列表 IsolatedStorageSetting 会是更好的选择.

But if you want to save just a couple of coordinates, not a list IsolatedStorageSetting would be a better option.

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