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我遇到问题在MVVM银色灯光应用程序中通过我的ViewModel绑定自定义用户控件。基本控件是带三个文本框的日期输入表单。我正在使用MVVM在三个属性中获取文本框数据，然后将其验证为Date。 绑定下面的控制到MVVM对我来说工作得很好。在silvelight用户控件中自定义绑定
XAML用户控制：DateControl.xaml
<UserControl x:Class="DatePicker.DateControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<Grid x:Name="LayoutRoot" Background="White"
HorizontalAlignment="Center">
<StackPanel Orientation="Horizontal">
<StackPanel Orientation="Horizontal">
<TextBox MaxLength="2" TabIndex="0" Style="{StaticResource BirthDDTextBoxStyle}"
Text="{Binding BirthDay,Mode=TwoWay,ValidatesOnNotifyDataErrors=True, NotifyOnValidationError=True}"/>
<TextBlock Style="{StaticResource TextBlockStyle_DateSeperator}"/>
<TextBox MaxLength="2" TabIndex="1" Style="{StaticResource BirthDDTextBoxStyle}" Text="{Binding BirthMonth, Mode=TwoWay,ValidatesOnNotifyDataErrors=True, NotifyOnValidationError=True}"/>
<TextBlock Style="{StaticResource TextBlockStyle_DateSeperator}"/>
<TextBox MaxLength="4" TabIndex="2" Style="{StaticResource BirthYYTextBoxStyle}" Text="{Binding BirthYear, Mode=TwoWay, ValidatesOnNotifyDataErrors=True, NotifyOnValidationError=True}"/>
<Button Content="Show" Width="100" Height="30" Click="Button_Click"/>
</StackPanel>
</StackPanel>
</Grid>
</UserControl>
DateControlViewModel是
namespace DatePicker
{
public class DatePickerViewModel : EntityViewModel
{
public DatePickerViewModel()
{
}
private DateTime birthDate;
public DateTime BirthDate
{
get
{
return birthDate;
}
set
{
birthDate = value;
}
}
private string birthDay;
public string BirthDay
{
get { return birthDay; }
set
{
birthDay = value;
PropertyChangedHandler("BirthDay");
ValidateBirthDay("BirthDay", value);
}
}
private string birthMonth;
public string BirthMonth
{
get { return birthMonth; }
set
{
birthMonth = value;
PropertyChangedHandler("BirthMonth");
ValidateBirthMonth("BirthMonth", value);
}
}
private string birthYear;
public string BirthYear
{
get { return birthYear; }
set
{
birthYear = value;
PropertyChangedHandler("BirthYear");
ValidateBirthYear("BirthYear", value);
}
}
private void ValidateDOB()
{
ClearErrorFromProperty("BirthDay");
ClearErrorFromProperty("BirthMonth");
ClearErrorFromProperty("BirthYear");
if (string.IsNullOrEmpty(BirthDay))
ValidateBirthDay("BirthDay", BirthDay);
if (string.IsNullOrEmpty(BirthMonth))
ValidateBirthMonth("BirthMonth", BirthMonth);
if (string.IsNullOrEmpty(BirthYear))
ValidateBirthYear("BirthYear", BirthYear);
if (!string.IsNullOrEmpty(BirthDay) && !string.IsNullOrEmpty(BirthMonth) && !string.IsNullOrEmpty(BirthYear))
SetDateOfBirth();
}
private void ValidateBirthDay(string propertyName, string value)
{
ClearErrorFromProperty(propertyName);
if (String.IsNullOrEmpty(value))
AddErrorForProperty(propertyName, "Resources.PatientImport.EmptyDayMessage");
else
if (Common.IsNumber(value))
{
int day = Convert.ToInt32(value);
if (day > 31 || day < 1)
AddErrorForProperty(propertyName, "Resources.PatientImport.InvalidDayMessage");
}
else
AddErrorForProperty(propertyName, "Resources.PatientImport.InvalidDayMessage");
}
private void ValidateBirthMonth(string propertyName, string value)
{
ClearErrorFromProperty(propertyName);
if (String.IsNullOrEmpty(value))
AddErrorForProperty(propertyName, "Resources.PatientImport.EmptyMonthMessage");
else
if (Common.IsNumber(value))
{
int month = Convert.ToInt32(value);
if (month > 12 || month < 1)
AddErrorForProperty(propertyName, "Resources.PatientImport.InvalidMonthMessage");
}
else
AddErrorForProperty(propertyName, "Resources.PatientImport.InvalidMonthMessage");
}
private void ValidateBirthYear(string propertyName, string value)
{
ClearErrorFromProperty(propertyName);
if (String.IsNullOrEmpty(value))
AddErrorForProperty(propertyName, "Resources.PatientImport.EmptyYearMessage");
else
if (Common.IsNumber(value))
{
int year = Convert.ToInt32(value);
if (year.ToString().Length > 4 || year.ToString().Length < 4)
AddErrorForProperty(propertyName, "Resources.PatientImport.InvalidYearMessage");
}
else
AddErrorForProperty(propertyName, "Resources.PatientImport.InvalidYearMessage");
}
private void SetDateOfBirth()
{
string dateString = BirthDay + "-" + BirthMonth + "-" + BirthYear;
DateTime date;
if (!DateTime.TryParse(dateString.ToString(), out date))
{
ClearErrorFromProperty("BirthDay");
ClearErrorFromProperty("BirthMonth");
ClearErrorFromProperty("BirthYear");
AddErrorForProperty("BirthDay", "Resources.PatientImport.InvalidDayMessage");
AddErrorForProperty("BirthMonth", "Resources.PatientImport.InvalidMonthMessage");
AddErrorForProperty("BirthYear", "Resources.PatientImport.InvalidYearMessage");
}
else
BirthDate = date;
}
}
}
我想在我的MainPage.xaml中
<UserControl x:Class="DatePicker.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:DatePicker"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="400">
<Grid x:Name="LayoutRoot" Background="White">
<local:DateControl />
</Grid>
</UserControl>
我要定义一个DateControl财产，我会用我的用户控件绑定MainPage.xaml中的视图模型
喜欢的东西
<Grid x:Name="LayoutRoot" Background="White">
<local:DateControl Date="{Binding BirthDate, Mode=TwoWay, ValidatesOnNotifyDataErrors=True, NotifyOnValidationError=True}"/>
</Grid>
出生日期是字符串类型属性。
如何更改我的用户，这样我可以在MainPage.xaml中使用saperate MVVM
你应该阅读[编辑帮助]（http://stackoverflow.com/editing-help），格式很破碎... –
检查这个答案。 http://stackoverflow.com/questions/76412/expose-dependencyproperty – Aardvark
为什么你将Date属性添加到你的UserControl？视图可以在没有代码的情况下存在，一切都可以仅使用视图模型来完成。 – vorrtex