83 lines
3.6 KiB
C#
83 lines
3.6 KiB
C#
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using FluentValidation;
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using System.Globalization;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Data;
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using ValidationResult = System.Windows.Controls.ValidationResult;
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namespace YY.Admin.Core.FluentValidation
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{
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internal class FluentAutoValidationRule<T> : ValidationRule, IFluentAutoValidationRule where T : class
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{
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public IValidator<T>? Validator { get; set; }
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/// <summary>
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/// 当前绑定控件对应的属性名
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/// </summary>
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public string? PropertyName { get; set; }
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// 👇 ValidationStep.UpdatedValue为true: 让Validate方法中value参数为BindingExpression类型，而非值类型
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public FluentAutoValidationRule() : base(ValidationStep.UpdatedValue, true) { }
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public override ValidationResult Validate(object value, CultureInfo cultureInfo)
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{
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if (Validator == null || string.IsNullOrEmpty(PropertyName))
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return ValidationResult.ValidResult;
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// 如果 value 不是 BindingExpression，先尝试判断是否是 BindingGroup (兼容性保护)
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if (value is not BindingExpression bindingExpr)
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{
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// 有时 WPF 在不同阶段会传入 BindingGroup 或其他类型，直接跳过初始化阶段的验证，避免误报
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return ValidationResult.ValidResult;
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}
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// --- 更可靠地判断“初始化阶段的第一次验证” ---
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// 如果绑定目标尚未挂到视觉树或控件未 Loaded，则视为初始化，不执行验证
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var target = bindingExpr.Target as DependencyObject;
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if (target != null)
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{
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// 1) 如果是 FrameworkElement 并且还没 Loaded，则跳过
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if (target is FrameworkElement fe && !fe.IsLoaded)
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return ValidationResult.ValidResult;
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// 2) 如果 PresentationSource 为空，也说明还没连接到可视树，跳过
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var ps = System.Windows.PresentationSource.FromVisual(target as System.Windows.Media.Visual);
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if (ps == null)
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return ValidationResult.ValidResult;
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// 3) 另外，如果控件不可见，也可能是初始化阶段，可根据需要跳过
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if (target is UIElement ui && !ui.IsVisible)
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return ValidationResult.ValidResult;
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}
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var dataItem = bindingExpr.DataItem;
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if (dataItem == null)
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return new ValidationResult(false, "绑定源为空");
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// 解析 Path，例如 "SysUser.Account"
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var path = bindingExpr.ParentBinding.Path?.Path ?? string.Empty;
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var rootPropName = path.Split('.')[0]; // SysUser
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var modelProp = dataItem.GetType().GetProperty(rootPropName);
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if (modelProp == null)
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return ValidationResult.ValidResult;
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var modelObj = modelProp.GetValue(dataItem);
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if (modelObj is not T model)
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return ValidationResult.ValidResult;
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// 调用 FluentValidation 验证指定属性
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var result = Validator.ValidateAsync(model, opts => opts.IncludeProperties(PropertyName))
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.ConfigureAwait(false) // 同步等待Task（ValidationRule 不支持 async → 只能同步等待。）
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.GetAwaiter()
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.GetResult();
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var error = result.Errors.FirstOrDefault(e => e.PropertyName == PropertyName);
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if (error != null)
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return new ValidationResult(false, error.ErrorMessage);
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return ValidationResult.ValidResult;
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}
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}
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}
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