问题

我有这个自定义行为附加到一个Entry字段：

public partial class SsnValidationBehavior : TextValidationBehavior
{
    public static readonly BindableProperty Iso2CountryProperty = BindableProperty.Create(nameof(Iso2Country), typeof(string), typeof(SsnValidationBehavior), "cl");

    public string Iso2Country
    {
        get => (string)GetValue(Iso2CountryProperty);
        set => SetValue(Iso2CountryProperty, value);
    }

    public static bool ChileValidate(string docNumber)
    {
        string rut = CleanRegex().Replace(docNumber, string.Empty).ToUpper();

        if (rut.Length >= 2)
        {
            string dv = rut[rut.Length - 1].ToString();
            if (MatchRegex().IsMatch(dv))
            {
                int largo = rut.Length;

                if (largo > 10 || largo < 2) return false;

                // La parte del RUT debe ser un número entero
                if (int.TryParse(rut.AsSpan(0, largo - 1), out _))
                {
                    // El dígito verificador debe ser un número o la K
                    if ((rut[largo - 1].CompareTo('0') < 0 || rut[largo - 1].CompareTo('9') > 0) && rut[largo - 1] != 'K')
                        return false;

                    // Realiza la operación módulo
                    int suma = 0;
                    int mul = 2;

                    // -2 porque rut contiene el dígito verificador, el cual no hay que considerar
                    for (int i = rut.Length - 2; i >= 0; i--)
                    {
                        suma += int.Parse(rut[i].ToString()) * mul;
                        if (mul == 7) mul = 2; else mul++;
                    }

                    int residuo = suma % 11;

                    char dvr;
                    if (residuo == 1)
                        dvr = 'K';
                    else if (residuo == 0)
                        dvr = '0';
                    else
                        dvr = (11 - residuo).ToString()[0];

                    return dvr.Equals(rut[^1]);
                }
            }
        }

        return false;
    }

    protected override async ValueTask<bool> ValidateAsync(string value, CancellationToken token)
    {
        bool result = true;
        string iso2 = Iso2Country ?? string.Empty;
        switch (iso2)
        {
            case "cl":
                result = ChileValidate(value);
                break;
        }

        return result && await base.ValidateAsync(value, token);
    }

    [GeneratedRegex("[ .-]")]
    private static partial Regex CleanRegex();
    [GeneratedRegex("[0-9K]")]
    private static partial Regex MatchRegex();
}

当我在字段中按任意键时，应用程序挂起（甚至是Visual Studio）。我在ValidateAsync上放置了一个断点，但没有达到。

我从https://github.com/CommunityToolkit/Maui/blob/main/src/CommunityToolkit.Maui/Behaviors/Validators/EmailValidationBehavior.shared.cs中获取了这个行为的模型。

有任何帮助吗？

public partial class SsnValidationBehavior : TextValidationBehavior
{
public static readonly BindableProperty Iso2CountryProperty = BindableProperty.Create(nameof(Iso2Country), typeof(string), typeof(SsnValidationBehavior), "cl");
public string Iso2Country
{
get => (string)GetValue(Iso2CountryProperty);
set => SetValue(Iso2CountryProperty, value);
}
public static bool ChileValidate(string docNumber)
{
string rut = CleanRegex().Replace(docNumber, string.Empty).ToUpper();
if (rut.Length >= 2)
{
string dv = rut[rut.Length - 1].ToString();
if (MatchRegex().IsMatch(dv))
{
int largo = rut.Length;
if (largo > 10 || largo < 2) return false;
// La parte del RUT debe ser un número entero
if (int.TryParse(rut.AsSpan(0, largo - 1), out _))
{
// El dígito verificador debe ser un número o la K
if ((rut[largo - 1].CompareTo('0') < 0 || rut[largo - 1].CompareTo('9') > 0) && rut[largo - 1] != 'K')
return false;
// Realiza la operación módulo
int suma = 0;
int mul = 2;
// -2 porque rut contiene el dígito verificador, el cual no hay que considerar
for (int i = rut.Length - 2; i >= 0; i--)
{
suma += int.Parse(rut[i].ToString()) * mul;
if (mul == 7) mul = 2; else mul++;
}
int residuo = suma % 11;
char dvr;
if (residuo == 1)
dvr = 'K';
else if (residuo == 0)
dvr = '0';
else
dvr = (11 - residuo).ToString()[0];
return dvr.Equals(rut[^1]);
}
}
}
return false;
}
protected override async ValueTask<bool> ValidateAsync(string value, CancellationToken token)
{
bool result = true;
string iso2 = Iso2Country ?? string.Empty;
switch (iso2)
{
case "cl":
result = ChileValidate(value);
break;
}
return result && await base.ValidateAsync(value, token);
}
[GeneratedRegex("[ .-]")]
private static partial Regex CleanRegex();
[GeneratedRegex("[0-9K]")]
private static partial Regex MatchRegex();
}

答案1

得分: 1

首先，我已经创建了一个新的项目来测试您的自定义行为。但我无法重现您的问题。以下是代码：

<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="MauiApp4.NewPage2"
             xmlns:mybehavior="clr-namespace:MauiAppTest"
             xmlns:toolkit="http://schemas.microsoft.com/dotnet/2022/maui/toolkit"
             Title="NewPage2">
    <ContentPage.Resources>
        <Style x:Key="InvalidEntryStyle" TargetType="Entry">
            <Setter Property="TextColor" Value="Blue" />
        </Style>
        <Style x:Key="ValidEntryStyle" TargetType="Entry">
            <Setter Property="TextColor" Value="Green" />
        </Style>
    </ContentPage.Resources>

    <Entry x:Name="entry">
        <Entry.Behaviors>
            <mybehavior:SsnValidationBehavior
                InvalidStyle="{StaticResource InvalidEntryStyle}"
                ValidStyle="{StaticResource ValidEntryStyle}"
                Flags="ValidateOnValueChanged"
                MinimumLength="1"
                MaximumLength="10" />
        </Entry.Behaviors>
    </Entry>
</ContentPage>

此外，我还添加了一个断点在ValidateAsync方法，它可以被触发。首先，我看到iso2和Iso2Country的值始终是cl（默认值），因此result && await base.ValidateAsync(value, token)始终为false。看起来您从未调用过Iso2Country的setter方法。

另外，我也查看了您的最后一个问题。如果您想检查输入框的文本是否为null或为空，您可以使用DataTrigger来实现。例如：

<Entry x:Name="entry">
    <Entry.Triggers>
        <DataTrigger TargetType="Entry" Binding="{Binding Source={x:Reference entry}, Path=Text}" Value="{x:Null}">
            <Setter Property="BackgroundColor" Value="Pink"/>
        </DataTrigger>
        <DataTrigger TargetType="Entry" Binding="{Binding Source={x:Reference entry}, Path=Text.Length}" Value="0">
            <Setter Property="BackgroundColor" Value="Pink"/>
        </DataTrigger>
    </Entry.Triggers>
</Entry>

这将根据输入框的文本是否为null或长度是否为0来设置背景颜色为粉红色。

<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="MauiApp4.NewPage2"
xmlns:mybehavior="clr-namespace:MauiAppTest"
xmlns:toolkit="http://schemas.microsoft.com/dotnet/2022/maui/toolkit"
Title="NewPage2">
<ContentPage.Resources>
<Style x:Key="InvalidEntryStyle" TargetType="Entry">
<Setter Property="TextColor" Value="Blue" />
</Style>
<Style x:Key="ValidEntryStyle" TargetType="Entry">
<Setter Property="TextColor" Value="Green" />
</Style>
</ContentPage.Resources>
<Entry x:Name="entry">
<Entry.Behaviors>
<mybehavior:SsnValidationBehavior
InvalidStyle="{StaticResource InvalidEntryStyle}"
ValidStyle="{StaticResource ValidEntryStyle}"
Flags="ValidateOnValueChanged"
MinimumLength="1"
MaximumLength="10" />
</Entry.Behaviors>
</Entry>
</ContentPage>

<Entry x:Name="entry">
<Entry.Triggers>
<DataTrigger TargetType="Entry" Binding="{Binding Source={x:Reference entry}, Path=Text}" Value="{x:Null}">
<Setter Property="BackgroundColor" Value="Pink"/>
</DataTrigger>
<DataTrigger TargetType="Entry" Binding="{Binding Source={x:Reference entry}, Path=Text.Length}" Value="0">
<Setter Property="BackgroundColor" Value="Pink"/>
</DataTrigger>
</Entry.Triggers>
</Entry>
</details>