C# 从var项中获取值？

我有一个wp8应用程序，它将列表选择器绑定到xml数据源，当我选择项目时，我希望能够获取“源”src位置文件位置。当我检查我发现src选择了名称的项目时，我有这个功能

private void SoudListPicker_SelectionChanged(object sender, System.Windows.Controls.SelectionChangedEventArgs e)
{
    // TODO: Add event handler implementation here.

    var item  = (sender as ListPicker).SelectedItem;
    MessageBox.Show("Selected Item is : " + item);
}

---

var

使用赋值语句右侧的结果类型来推断它的类型，我认为是

object

就是这种情况

要使属性可见，需要将

SelectedItem

强制转换为它的实际类型

private void SoudListPicker_SelectionChanged(object sender, System.Windows.Controls.SelectionChangedEventArgs e)
{
    // TODO: Add event handler implementation here.

    var item  = ((sender as ListPicker).SelectedItem) as Expression.Blend.SampleData.soundsEFXSampleDataSource3.sound;

    if(item != null)
        MessageBox.Show("Selected Item is : " + item.src);
}

---

var

使用赋值语句右侧的结果类型来推断它的类型，我认为是

object

就是这种情况

要使属性可见，需要将

SelectedItem

强制转换为它的实际类型

private void SoudListPicker_SelectionChanged(object sender, System.Windows.Controls.SelectionChangedEventArgs e)
{
    // TODO: Add event handler implementation here.

    var item  = ((sender as ListPicker).SelectedItem) as Expression.Blend.SampleData.soundsEFXSampleDataSource3.sound;

    if(item != null)
        MessageBox.Show("Selected Item is : " + item.src);
}

---

var

使用赋值语句右侧的结果类型来推断它的类型，我认为是

object

就是这种情况

要使属性可见，需要将

SelectedItem

强制转换为它的实际类型

private void SoudListPicker_SelectionChanged(object sender, System.Windows.Controls.SelectionChangedEventArgs e)
{
    // TODO: Add event handler implementation here.

    var item  = ((sender as ListPicker).SelectedItem) as Expression.Blend.SampleData.soundsEFXSampleDataSource3.sound;

    if(item != null)
        MessageBox.Show("Selected Item is : " + item.src);
}

---

var

使用赋值语句右侧的结果类型来推断它的类型，我认为是

object

就是这种情况

要使属性可见，需要将

SelectedItem

强制转换为它的实际类型

private void SoudListPicker_SelectionChanged(object sender, System.Windows.Controls.SelectionChangedEventArgs e)
{
    // TODO: Add event handler implementation here.

    var item  = ((sender as ListPicker).SelectedItem) as Expression.Blend.SampleData.soundsEFXSampleDataSource3.sound;

    if(item != null)
        MessageBox.Show("Selected Item is : " + item.src);
}