如果我有以下TextBox：
<TextBox Height="30" Width="300" Margin="10" Text="{Binding IntProperty,NotifyOnValidationError=True}" Validation.Error="ContentPresenter_Error"> </TextBox>
而这在codebehind：
private void ContentPresenter_Error(object sender,ValidationErrorEventArgs e) {
MessageBox.Show(e.Error.ErrorContent.ToString());
}
如果在文本框中输入字母“x”,弹出的消息是
value ‘x’ could not be converted
有没有办法自定义这个消息？
解决方法
我不喜欢回答我自己的问题,但是看起来唯一的办法是实现一个ValidationRule,就像下面的(可能有一些bug)：
public class BasicIntegerValidator : ValidationRule {
public string PropertyNameToDisplay { get; set; }
public bool Nullable { get; set; }
public bool AllowNegative { get; set; }
string PropertyNameHelper { get { return PropertyNameToDisplay == null ? string.Empty : " for " + PropertyNameToDisplay; } }
public override ValidationResult Validate(object value,System.Globalization.CultureInfo cultureInfo) {
string textEntered = (string)value;
int intOutput;
double junkd;
if (String.IsNullOrEmpty(textEntered))
return Nullable ? new ValidationResult(true,null) : new ValidationResult(false,getMsgDisplay("Please enter a value"));
if (!Int32.TryParse(textEntered,out intOutput))
if (Double.TryParse(textEntered,out junkd))
return new ValidationResult(false,getMsgDisplay("Please enter a whole number (no decimals)"));
else
return new ValidationResult(false,getMsgDisplay("Please enter a whole number"));
else if (intOutput < 0 && !AllowNegative)
return new ValidationResult(false,getNegativeNumberError());
return new ValidationResult(true,null);
}
private string getNegativeNumberError() {
return PropertyNameToDisplay == null ? "This property must be a positive,whole number" : PropertyNameToDisplay + " must be a positive,whole number";
}
private string getMsgDisplay(string messageBase) {
return String.Format("{0}{1}",messageBase,PropertyNameHelper);
}
}
