64 lines
2.5 KiB
C#
64 lines
2.5 KiB
C#
using System.Globalization;
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using System.Reflection;
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using System.Windows.Controls;
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using System.Windows.Data;
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using BS.Shared.Extensions;
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namespace BeWo.Validation
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{
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public class AttributeValidator : ValidationRule
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{
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public BindingExpression ExpressionToValidate { get; set; }
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public override ValidationResult Validate(object pValue, CultureInfo pCultureInfo)
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{
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bool lValid = true;
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if (this.ExpressionToValidate != null)
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{
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PropertyInfo lPropInfo = null;
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object lCurrentObject = this.ExpressionToValidate.DataItem;
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// Claude: DataItem des Bindings und Eltern-Objekt des Ziel-Propertys festhalten,
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// damit kontextabhaengige Regeln den Klientenbezug auswerten koennen.
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// Bei "PrototypeVM.Notice" ist das DataItem die ServiceRecordListVM (kennt
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// WithoutClient), bei "Notice" in den EditViews die ServiceRecordVM selbst.
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object lDataItem = lCurrentObject;
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object lOwner = lCurrentObject;
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if (lCurrentObject != null)
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{
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foreach (var iPropName in this.ExpressionToValidate.ParentBinding.Path.Path.Split("."))
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{
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lOwner = lCurrentObject; // Claude: vor dem GetValue merken
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lPropInfo = lCurrentObject.GetType().GetProperty(iPropName);
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lCurrentObject = lPropInfo.GetValue(lCurrentObject, null);
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}
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}
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if (lPropInfo != null)
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{
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var lAttributes = lPropInfo.GetCustomAttributes(typeof(ValidationAttribute), true);
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if (lAttributes.Length > 0)
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{
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// Claude: DataItem hat Vorrang, weil dort der View-Zustand liegt
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// (ServiceRecordListVM.WithoutClient); sonst greift das Eltern-Objekt.
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var lContext = (lDataItem as ICustomerRelatedContext)
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?? (lOwner as ICustomerRelatedContext);
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lValid = ((ValidationAttribute) lAttributes[0]).Validate(pValue, lContext);
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}
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}
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}
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if (!lValid)
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{
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}
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// TODO: Nachricht, am besten als Property im ValidationAttribut
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return new ValidationResult(lValid, null);
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}
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}
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} |