WPF 文本框控件部分字符输入限制

在使用文本框作为用户输入时，有时需要限制部分特殊字符不可输入

为此，本文编写了 文本框控件部分字符输入限制行为 代码，仅供参考学习

代码如下

public class TextBoxValidStringBehaviour : Behavior
    {
        //无效字符集
        public object NotValidStrings
        {
            get => (object)GetValue(NotValidStringsProperty);
            set => SetValue(NotValidStringsProperty, value);
        }

        public static readonly DependencyProperty NotValidStringsProperty =
            DependencyProperty.Register("NotValidStrings", typeof(object), typeof(TextBoxValidStringBehaviour), new PropertyMetadata(0));



        protected override void OnAttached()
        {
            base.OnAttached();

            AssociatedObject.PreviewTextInput += Edit_PreviewTextInput;
        }

        private void Edit_PreviewTextInput(object sender, TextCompositionEventArgs e)
        {
            var edit = sender as TextBox;
            if (edit != null && !string.IsNullOrEmpty(edit.Text) && !IsDataValid(e.Text))
                edit.Text = edit.Text.Replace(e.Text, "");
            e.Handled = !IsDataValid(e.Text);
        }

        bool IsDataValid(object data)
        {
            if (NotValidStrings == null)
            {
                return true;
            }
            else
            {
                if (NotValidStrings is string[] strings)
                {
                    return !strings.Contains(data?.ToString());
                }

                return true;
            }
        }

    }

    
        
            
                
                    
                        
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