【发布时间】：2020-03-12 16:19:37
【问题描述】：
我的选择器有问题。我关注了这个帖子Saving and reading Picker values from SQLite - Xamarin.Forms
我得到“未处理的异常：System.Reflection.TargetInvocationException：异常已被调用的目标抛出。”
这是我的模特
public class AdLogEntry
{
[PrimaryKey, AutoIncrement]
public int Id { get; set; }
public string SellerName { get; set; }
public string ImagePath { get; set; }
//public ImageSource ImageName { get; set; }
public byte[] OriginalImage { get; set; }
public string Info { get; set; }
public string Section { get; set; }
public string AnimalCategory { get; set; }
public string Name { get; set; }
public string Description { get; set; }
public string Price { get; set; }
public DateTime LoadedDate { get; }
public DateTime Date { get; set; }
public DatePicker GetDatePicker { get; }
public string Location { get; set; }
public int Age { get; set; }
}
this is my code
private async void Save_Clicked(object sender, EventArgs e)
{
await SaveAdLog();
}
//TODO IsNullOR for all
//TODO Marks for required fields
private async Task SaveAdLog()
{
if (!string.IsNullOrWhiteSpace(NameEntry.Text) || (!string.IsNullOrWhiteSpace(PriceEntry.Text) || (!string.IsNullOrWhiteSpace(LocationEntry.Text) )))
{
AdLogEntry adLogEntry = new AdLogEntry
{
Location = LocationEntry.Text,
Price = PriceEntry.Text,
Name = NameEntry.Text,
Section = (string)SectionPicker.SelectedItem,
AnimalCategory = (string)CategoryPicker.SelectedItem,
};
_adService.CreateAddLogEntry(adLogEntry);
await DisplayAlert(LabelCZ.AlertThankYou, LabelCZ.AlertSpace, LabelCZ.AlertOk);
}
else
{
await DisplayAlert(LabelCZ.AlertRequired, LabelCZ.AlertRequiredPlease, LabelCZ.AlertOk);
};
}
<Grid Grid.Row="0" RowSpacing="12">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Entry x:Name="NameEntry" Placeholder ="{x:Static resources:LabelCZ.LabelWhatAreYouSelling}" Grid.Row="1"/>
<Picker x:Name="SectionPicker" Grid.Row="2" Title="{x:Static resources:LabelCZ.LabelSection}" ItemsSource="{Binding Sections}" ItemDisplayBinding="{Binding SectionName}" SelectedItem="{Binding Section}"/>
<Picker x:Name="CategoryPicker" Grid.Row="3" Title="{x:Static resources:LabelCZ.LabelCategory}" ItemsSource="{Binding AnimalCategories}" ItemDisplayBinding="{Binding AnimalKind}" SelectedItem="{Binding AnimalCategory}"/>
<Picker x:Name="PetsCategoryPicker" Grid.Row="4" Title="{x:Static resources:LabelCZ.LabelPetsCategory}" ItemsSource="{Binding CatBreeds}" ItemDisplayBinding="{Binding CatBreedKind}" />
<Entry x:Name="PriceEntry" Grid.Row="5" Placeholder ="{x:Static resources:LabelCZ.LabelPrice}" FontSize="{ StaticResource SubTitleSize }"/>
<Entry x:Name="LocationEntry" Grid.Row="6" Placeholder= "{x:Static resources:LabelCZ.LabelLocation}" FontSize="{ StaticResource SubTitleSize }" />
<Entry x:Name="PickUpDate" Grid.Row="7" Placeholder ="{x:Static resources:LabelCZ.LabelPickUPDay}" FontSize="{ StaticResource SubTitleSize }"/>
</Grid>
也许你们能看出一些错误？
【问题讨论】：
-
这是您之前遇到的完全相同的问题。您正在尝试在数据库中创建
DatePicker列，而 SQLite 不知道那是什么。 SQLite 只能使用原始类型，如 int、string、DateTime 等。 -
那不是同一个选择器，我还没有使用日期 pciker。但谢谢你的回答，我会确保我解决这个问题。
-
这些选择器是字符串部分和动物类别
-
Jason 正在谈论`public DatePicker GetDatePicker { get; } ` 你应该考虑把它改成字符串
-
@Leo Zhu - MSFT 嗨，它现在可以工作了，谢谢。如果您将其添加为 answr 我可以标记它>]
标签： xamarin.forms