转换米公里,格式化视图模型的价值 [英] Convert meters to kilometers and format the value in Viewmodel
问题描述
我的视图模型:
public class PartnerSearchResultVM
{
public int Id { get; set; }
public string Name { get; set; }
public string Latitude { get; set; }
public string Longitude { get; set; }
public double Distance { get; set; }
public string Classification { get; set; }
}
我得到这样的数据库中米的距离:2354,58764478263米
I get the distance in meters from the database like this: 2354,58764478263 m
我想present2.35公里
I would like to present 2.35 km
如何改变视图模型,使皈依那里(如果它是做的最好的地方)
How change the Viewmodel to make the convertion there (if it's the best place to do it)
推荐答案
我只读属性添加到您的模型。
I'd add a read-only property to your model.
public double Kilometers { get { return this.Distance / 1000; } }
如果你想有一个格式化字符串后面我会创建第二个只读属性。
If you want a formatted string back I'd create a second readonly property.
public string KilometerDisplay {
get {
return String.Format("{0:0.00}km", this.Kilometers);
}
}
虽然,这取决于你的使用情况,广义的格式化功能可能是适当的。也许作为一个扩展方法:
Although, depending on your use case, a generalized format function might be appropriate. Perhaps as an extension method:
[Extension]
public string FormatDistance(this double distance) {
return distance.FormatDistance("");
}
[Extension]
public string FormatDistance(this double distance, string unitString) {
return return String.Format("{0:0.00}{1}", distance, unitString);
}
// for meters: result.Distance.FormatDistance("m");
// for kilometers: result.Kilometers.FormatDistance("km");
然后添加一些XML文档的距离
属性解释说这是米。
Then add some XML documentation to the Distance
property explaining that it is in meters.
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