这是代码：

XAML

<TextBox {...} Text="{Binding Path=ProductName,UpdateSourceTrigger=PropertyChanged,ValidatesOnDataErrors=True}"/>

在viewmodel上,使用数据注释进行验证：

码

private string _productName;

[required(AllowEmptyStrings = false,ErrorMessage = "The Product Name can't be null or empty.")]
[StringLength(50,ErrorMessage = "The Product Name can't be longer than 50.")]
[Uniqueness(Entities.Product,ErrorMessage = "A Product with that Name already exists ")]
public string ProductName
{
    get { return _productName; }
    set
    {
        _productName = value;
        SaveProduct.OnCanExecuteChanged();
        OnPropertyChanged("ProductName");
    }
}

视图加载时如何停止验证触发？

我不想让TextBox在插入数据之前显示错误.