WPF地图应用程序 [英] WPF Maps Application

问题描述

我有一个vb.net地图应用程序，我需要开发成c＃。下面是一段我无法弄清楚的代码。任何人都可以帮忙吗？

Hi,

I have a vb.net maps application that i need to develop into c#. Below is a piece of code that I cannot figure out. Can anyone help?

">

Private geoDoc As XDocument

Private Sub ShowGeocodeData()
        Dim responseStatus = geoDoc...<status>.Single.Value()</status>
        If (responseStatus = "OK") Then
            Dim formattedAddress = geoDoc...<formatted_address>(0).Value()
            Dim latitude = geoDoc...<location>(0).Element("lat").Value()
            Dim longitude = geoDoc...<location>(0).Element("lng").Value()
            Dim locationType = geoDoc...<location_type>(0).Value()

            AddressTxtBlck.Text = formattedAddress
            LatitudeTxtBlck.Text = latitude
            LongitudeTxtBlck.Text = longitude

            Select Case locationType
                Case "APPROXIMATE"
                    AccuracyTxtBlck.Text = "Approximate"
                Case "ROOFTOP"
                    AccuracyTxtBlck.Text = "Precise"
                Case Else
                    AccuracyTxtBlck.Text = "Approximate"
            End Select

            lat = Double.Parse(latitude)
            lng = Double.Parse(longitude)

            If (SaveButton.IsEnabled = False) Then
                SaveButton.IsEnabled = True
                RoadmapToggleButton.IsEnabled = True
                TerrainToggleButton.IsEnabled = True
            End If

        ElseIf (responseStatus = "ZERO_RESULTS") Then
            MessageBox.Show("Unable to show results for: " & vbCrLf & _
                            location, "Unknown Location", MessageBoxButton.OK, _
                            MessageBoxImage.Information)
            DisplayXXXXXXs()
            AddressTxtBox.SelectAll()
        End If
        ShowMapButton.IsEnabled = True
        ZoomInButton.IsEnabled = True
        ZoomOutButton.IsEnabled = True
        MapProgressBar.Visibility = Windows.Visibility.Hidden
    End Sub
</location_type></location></location>

我无法弄清楚代码粗体文字的含义。即Dim responseStatus = geoDoc ...< status> .Single.Value（）



谢谢！

I cannot figure out the meaning of the bold text of code. i.e. Dim responseStatus = geoDoc...<status>.Single.Value()

Thanks!

推荐答案

geoDoc。< status> 是一个 IEnumerable< XElement>

单个是一个LINQ扩展方法 Enumerable.Single（Of TSource） [ ^ ]

单个返回IEnumerable中唯一的元素（在这种情况下为 XElement ），但如果IEnumerable包含0或多于1项，则抛出异常。

值是<的属性code> XElement

geoDoc.<status> is an IEnumerable<XElement>
Single is a LINQ extension method Enumerable.Single(Of TSource)[^]
Single returns the one and only element in the IEnumerable (in this case an XElement), but throws an exception if the IEnumerable contains 0 or more than 1 item.
Value is a property of XElement

我正在努力与同一块代码：

Hi,

I am struggling with the same piece of code:

会员8192163写道：

Member 8192163 wrote:

Dim responseStatus = geoDoc ...< status> .Single .Value（）

Dim responseStatus = geoDoc...<status>.Single.Value()

你现在找到了答案吗？



谢谢

Bernd



抱歉...我没有看到解决方案。他们在我发布我的问题后出现了。不介意......

Did you find an answer now?

Thanks
Bernd

Sorry... I did not see the solutions. They appeared after I posted my question. Don't mind...

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