[英]WPF - User input validation using Fody Validar
I'm trying to validate user input as in above image. 我正在尝试验证用户输入,如上图所示。 I'm using Fody Validor library and following the instruction here .
我正在使用Fody Validor库,并按照此处的说明进行操作。
I can see the validation is taking place, but the TextBox borders are not turning into red color. 我可以看到验证正在进行中,但是TextBox边框没有变成红色。
I have Googled and I was unable to get information on this. 我已经用Google搜索,但无法获得有关此信息。 Could anyone provide me with a working code example?
谁能为我提供一个有效的代码示例?
UPDATE 更新
Fody ValidationTemplate (Data Annotation Validation) Fody ValidationTemplate(数据注释验证)
public class ValidationTemplate :IDataErrorInfo
{
INotifyPropertyChanged target;
ValidationContext validationContext;
List<ValidationResult> validationResults;
public ValidationTemplate(INotifyPropertyChanged target)
{
this.target = target;
validationContext = new ValidationContext(target, null, null);
validationResults = new List<ValidationResult>();
Validator.TryValidateObject(target, validationContext, validationResults, true);
target.PropertyChanged += Validate;
}
void Validate(object sender, PropertyChangedEventArgs e)
{
validationResults.Clear();
Validator.TryValidateObject(target, validationContext, validationResults, true);
var hashSet = new HashSet<string>(validationResults.SelectMany(x => x.MemberNames));
foreach (var error in hashSet)
{
OnValidate(error);
}
}
private HashSet<string> _errors = new HashSet<string>();
public string this[string columnName]
{
get
{
return OnValidate(columnName);
}
}
protected virtual string OnValidate(string propertyName)
{
string error = string.Empty;
try
{
if (string.IsNullOrEmpty(propertyName))
throw new ArgumentException("Invalid property name", propertyName);
var value = this.GetType().GetProperty(propertyName).GetValue(this, null);
var results = new List<ValidationResult>(1);
var context = new ValidationContext(this, null, null) { MemberName = propertyName };
var result = Validator.TryValidateProperty(value, context, results);
if (!result)
{
var validationResult = results.First();
error = validationResult.ErrorMessage;
_errors.Add(propertyName);
}
else
{
_errors.Remove(propertyName);
}
}
catch (Exception) { }
return error;
}
public bool HasErrors
{
get { return _errors.Count > 0; }
}
public string Error { get; set; }
}
Model class to be validated: 要验证的模型类:
public class Movie : INotifyPropertyChanged
{
IDataErrorInfo validationTemplate;
public Movie()
{
validationTemplate = new ValidationTemplate(this);
}
private int _id;
private string _title;
public int Id
{
get { return _id; }
set
{
if (_id != value)
{
_id = value;
OnPropertyChanged("Id");
}
}
}
[Required]
[StringLength(30)]
[MinLength(3)]
public string Title
{
get { return _title; }
set
{
if (_title != value)
{
_title = value;
OnPropertyChanged("Title");
}
}
}
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string name)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(name));
}
}
}
XAML XAML
<TextBox Text="{Binding Movie.Title, Mode=TwoWay, NotifyOnSourceUpdated=True, NotifyOnTargetUpdated=True, NotifyOnValidationError=True, ValidatesOnNotifyDataErrors=True, ValidatesOnDataErrors=True, UpdateSourceTrigger=PropertyChanged}" />
I have investigated and found the issue. 我已经调查并发现了问题。 The below configuration was missing in FodyWeavers.xml file.
FodyWeavers.xml文件中缺少以下配置。
<?xml version="1.0" encoding="utf-8" ?>
<Weavers>
<Validar/>
</Weavers>
The node <Validar/>
was removed when i updated the Fody
nuget package. 节点
<Validar/>
当我更新除去Fody
NuGet包。
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