WPF前台数据验证（红框）Validation.ErrorTemplate 附加属性

心已赠人 2022-03-30 11:59 461阅读 0赞

WPF 显示验证错误的默认方式是在控件周围绘制红色边框。通常需要对此方法进行自定义，以通过其他方式来显示错误。而且，默认情况下不会显示与验证错误关联的错误消息。常见的要求是仅当存在验证错误时才在工具提示中显示错误消息。通过将 Styles 和一组与验证关联的附加属性进行组合，可以相当轻松地自定义验证错误显示。

![Image 1][]![1361184282_7276.png][]

## 前台xaml： ##

后台代码：

using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Windows;
    using System.Windows.Controls;
    using System.Windows.Data;
    using System.Windows.Documents;
    using System.Windows.Input;
    using System.Windows.Media;
    using System.Windows.Media.Imaging;
    using System.Windows.Navigation;
    using System.Windows.Shapes;
    
    namespace WpfApplication11111
    {
        /// <summary>
        /// UserControl2.xaml 的交互逻辑
        /// </summary>
        public partial class UserControl2 : UserControl
        {
            private UserInfo _UserInfo;
            public UserControl2()
            {
                InitializeComponent();
                this.Loaded += new RoutedEventHandler(UserControl2_Loaded);
            }
    
            void UserControl2_Loaded(object sender, RoutedEventArgs e)
            {
                _UserInfo = new UserInfo();
                this.DataContext = _UserInfo;
            }
    
            private void btnSave_Click(object sender, RoutedEventArgs e)
            {
                //txtName.Visibility = Visibility.Collapsed;
                UserControl1 _UserControl1 = new UserControl1();
                grid.Children.Add(_UserControl1);
                string _name = _UserInfo.Name;
                string _pass = _UserInfo.Pass;
            }
        }
    }

## 实体类： ##

using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.ComponentModel;
    using System.ComponentModel.DataAnnotations;
    
    namespace WpfApplication11111
    {
        public class UserInfo : ValidationUtility, INotifyPropertyChanged
        {
            #region 数据更新通知
    
            public event PropertyChangedEventHandler PropertyChanged;
    
            private void NotifyPropertyChange(string propertyName)
            {
                if (PropertyChanged != null)
                {
                    PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
                }
            }
    
            #endregion
    
            private string _Name;
    
            [Required(ErrorMessage = "[登录名]内容不能为空！")]
            [StringLength(255, ErrorMessage = "[登录名]内容最大允许255个字符！")]
            [RegularExpression("^[A-Za-z0-9]+$", ErrorMessage = "[登录名]格式不正确！")]
            /// <summary>
            /// 
            /// </summary>
            public string Name
            {
                get { return _Name; }
                set
                {
                    //Validator.ValidateProperty(value, new ValidationContext(this, null, null) { MemberName = "Name" });
                    //if (string.IsNullOrEmpty(value))
                    //{
                    //    throw new Exception("用户名不能为空.");
                    //}
                    _Name = value;
                    NotifyPropertyChange("Name");
                }
            }
    
            private string _Pass;
            [Required(ErrorMessage = "[密码]内容不能为空！")]
            [StringLength(255, ErrorMessage = "[密码]内容最大允许255个字符！")]
            [RegularExpression("^[A-Za-z0-9]+$", ErrorMessage = "[密码]格式不正确！")]
            /// <summary>
            /// 
            /// </summary>
            public string Pass
            {
                get { return _Pass; }
                set
                {
                    //if (string.IsNullOrEmpty(value))
                    //{
                    //    throw new Exception("密码不能为空.");
                    //}
                    _Pass = value;
                    NotifyPropertyChange("Pass");
                }
            }
    
        }
    }

## ValidationUtility.cs ##

using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.ComponentModel;
    using System.Reflection;
    using System.ComponentModel.DataAnnotations;
    
    namespace WpfApplication11111
    {
        public class ValidationUtility : IDataErrorInfo
        {
            public string Error
            {
                get { return _error; }
            }
    
            public string _error;
    
            public string this[string columnName]
            {
                get
                {
                    Type tp = this.GetType();
                    PropertyInfo pi = tp.GetProperty(columnName);
                    var value = pi.GetValue(this, null);
                    object[] Attributes = pi.GetCustomAttributes(false);
                    if (Attributes != null && Attributes.Length > 0)
                    {
                        foreach (object attribute in Attributes)
                        {
                            if (attribute is ValidationAttribute)
                            {
                                ValidationAttribute vAttribute = attribute as ValidationAttribute;
                                if (!vAttribute.IsValid(value))
                                {
                                    _error = vAttribute.ErrorMessage;
                                    return _error;
                                }
                            }
                        }
                    }
                    return null;
                }
            }
        }
    }

## 追加PasswordBox验证 ##

## 代码下载地址： ##

[http://download.csdn.net/detail/hwt0101/5070730][http_download.csdn.net_detail_hwt0101_5070730]

## 相关地址： ##

[http://msdn.microsoft.com/zh-cn/magazine/ff714593.aspx][http_msdn.microsoft.com_zh-cn_magazine_ff714593.aspx]

[http://msdn.microsoft.com/zh-cn/library/system.windows.controls.validation.errortemplate(v=vs.90).aspx][http_msdn.microsoft.com_zh-cn_library_system.windows.controls.validation.errortemplate_v_vs.90_.aspx]

[http://msdn.microsoft.com/en-us/library/ms752068(v=vs.100).aspx][http_msdn.microsoft.com_en-us_library_ms752068_v_vs.100_.aspx]

[http://wpf.codeplex.com/releases/view/14962][http_wpf.codeplex.com_releases_view_14962]

[Image 1]: 
[1361184282_7276.png]: https://img-my.csdn.net/uploads/201302/18/1361184282_7276.png
[http_download.csdn.net_detail_hwt0101_5070730]: http://download.csdn.net/detail/hwt0101/5070730
[http_msdn.microsoft.com_zh-cn_magazine_ff714593.aspx]: http://msdn.microsoft.com/zh-cn/magazine/ff714593.aspx
[http_msdn.microsoft.com_zh-cn_library_system.windows.controls.validation.errortemplate_v_vs.90_.aspx]: http://msdn.microsoft.com/zh-cn/library/system.windows.controls.validation.errortemplate%28v=vs.90%29.aspx
[http_msdn.microsoft.com_en-us_library_ms752068_v_vs.100_.aspx]: http://msdn.microsoft.com/en-us/library/ms752068%28v=vs.100%29.aspx
[http_wpf.codeplex.com_releases_view_14962]: http://wpf.codeplex.com/releases/view/14962