如何设置Validations和DisplayStartDate

Question

我目前有2个控件。第一个控件是名为DisbursalDatePicker的DatePicker，第二个控件是具有多个列的网格。唯一重要的列是日期列。更改日期时，会进行验证检查以确定row.date是否在DisbursalDatePicker之前，如果它随后显示验证错误。

验证工作完美且没有错误。 displaystartdate正在为gridrows正常工作。但是如果存在验证错误，则由于某种原因，displaystartdate将设置为行的当前选定日期而不是DisbursalDatePicker。

private void DisbursalDatePicker_OnSelectionChanged(object sender, SelectionChangedEventArgs e)
{
    foreach (ScriptDTO script in RadGridView1.Items.OfType<ScriptDTO>())
    {
        if (script.Date <= DisbursalDatePicker.SelectedDate)
        {
            script.SetError("Date", "Must be after disbursal");
        }
        else
        {
            script.ClearErrors();
        }
    }
}

脚本DTO

public class ScriptDTO : INotifyPropertyChanged, IDataErrorInfo
{
    ...
    private DateTime _date;
    public DateTime Date
    {
        get { return _date; }
        set { _date = value; OnPropertyChanged("Date"); }
    }

    private readonly Dictionary<string, string> errors = new Dictionary<string, string>();

    public void ClearErrors()
    {
        this.errors.Clear();
    }

    public void SetError(string propertyName, string error)
    {
        string currentPropertyError;
        if (this.errors.TryGetValue(propertyName, out currentPropertyError))
        {
            this.errors.Remove(propertyName);
        }

        this.errors.Add(propertyName, error);
        this.OnPropertyChanged(propertyName);
    }

    public string GetError(string propertyName)
    {
        string result;
        if (this.errors.TryGetValue(propertyName, out result))
        {
            return result;
        }
        return null;
    }

    public string this[string columnName]
    {
        get
        {
            return this.GetError(columnName);
        }
    }

    public string Error
    {
        get
        {
            return null;
        }
    }
    ...
}

查看

<telerik:GridViewDataColumn Header="Date" DataMemberBinding="{Binding Date, StringFormat=d}">
    <telerik:GridViewDataColumn.CellEditTemplate>
        <DataTemplate>
                <DatePicker SelectedDate="{Binding Date}" DisplayDateStart="{Binding StartDate, Mode=TwoWay}" />
        </DataTemplate>
    </telerik:GridViewDataColumn.CellEditTemplate>
</telerik:GridViewDataColumn>

foreach (var script in ScheduleScripts)
{
    script.StartDate = DisbursalDate;
}