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  • 无废话WPF系列10: Binding对数据的检验

    设置Binding的ValidationRules属性对Binding进行检验

     <StackPanel>
            <TextBox x:Name="txtAge" FontSize="30" Foreground="Red"></TextBox>
            <TextBlock x:Name="errorSummary" FontSize="30" Foreground="Red"></TextBlock>
    </StackPanel>

    后台代码

    public partial class MainWindow : Window
        {
            
            public MainWindow()
            {
                InitializeComponent();
                Person p = new Person { Age = 20, Name = "Tom" };
                Binding binding = new Binding("Age") { Source = p };
    
                binding.NotifyOnValidationError = true;
    
                binding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;
                RangeValidationRule rv = new RangeValidationRule();
                binding.ValidationRules.Add(rv);
                this.txtAge.SetBinding(TextBox.TextProperty, binding);
    
                this.txtAge.AddHandler(Validation.ErrorEvent, new RoutedEventHandler(this.ValidationError));
            }
    
            void ValidationError(object sender, RoutedEventArgs e)
            {
                if (Validation.GetErrors(this.txtAge).Count > 0)
                {
                    this.txtAge.ToolTip = Validation.GetErrors(this.txtAge)[0].ErrorContent.ToString();
                    this.errorSummary.Text = Validation.GetErrors(this.txtAge)[0].ErrorContent.ToString();
                    // You can do everything here when validation error occurs
                }
            }
            
        }
    }

    image

    同样,我们在XAML里也可以设置验证

    <StackPanel>
            <TextBox x:Name="txtAge" FontSize="30" Foreground="Red"   Validation.Error="txtAge_Error">
                <Binding NotifyOnValidationError="True" Path="Age" UpdateSourceTrigger="PropertyChanged">
                    <Binding.ValidationRules>
                        <local:RangeValidationRule></local:RangeValidationRule>
                    </Binding.ValidationRules>
                </Binding>
            </TextBox>
            <TextBlock x:Name="errorSummary" FontSize="30" Foreground="Red"></TextBlock>
    </StackPanel>

    后台代码:

    public partial class MainWindow : Window
        {        
            public MainWindow()
            {
                InitializeComponent();
                Person p = new Person { Age = 20, Name = "Tom" };
                this.DataContext = p;           
            }        
            private void txtAge_Error(object sender, ValidationErrorEventArgs e)
            {
                if (Validation.GetErrors(this.txtAge).Count > 0)
                {
                    this.txtAge.ToolTip = Validation.GetErrors(this.txtAge)[0].ErrorContent.ToString();
    
                    this.errorSummary.Text = Validation.GetErrors(this.txtAge)[0].ErrorContent.ToString();
                    // You can do everything here when validation error occurs
                }
            }        
    }

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    作者: 王德水
    出处:http://www.cnblogs.com/cnblogsfans
    版权:本文版权归作者所有,转载需经作者同意。

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  • 原文地址:https://www.cnblogs.com/cnblogsfans/p/1958646.html
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