示例来自How to disable a Button on TextBox ValidationErrors in WPF
效果如图
继承ValidationRule实现验证类
public class OverThirteenValidationRule : ValidationRule
{
public override ValidationResult Validate(object value, System.Globalization.CultureInfo cultureInfo)
{
if (value != null)
{
int age = 0;
try
{
age = Convert.ToInt32(value);
}
catch
{
return new ValidationResult(false, "You must be older than 13!");
}
if (age > 13)
return ValidationResult.ValidResult;
}
return new ValidationResult(false, "You must be older than 13!");
}
}通过MultiDataTrigger绑定提交按钮的IsEnabled属性
通过Path获得每个输入框的Validation.HasError值，当所有TextBox的HasError=false时，设置提交按钮可用
显示提示信息同样通过Validation.Errors的值判断是否显示提示信息，这里用了一个Converter（ToVisibility），判断错误信息个数是否为0，为0则不显示，不为0则显示显示内容为(Validation.Errors)[0].ErrorContent，即第一个错误内容，即如果有多个验证、有多个报错内容也只显示第一个>示例代码ValidationRule 类参考资料How to: Implement Binding ValidationHow to disable a Button on TextBox ValidationErrors in WPFAccessing WPF control validation rules from code" _ue_custom_node_="true">
