如何正确实现INotifyDataErrorInfo?

问题描述

我对 MSDN感到困惑例子.

目前尚不清楚如何处理和设置实体实体错误.

It's not clear how to treat and set entity realted errors.

示例代码:

public System.Collections.IEnumerable GetErrors(string propertyName)
{
    if (String.IsNullOrEmpty(propertyName) || 
        !errors.ContainsKey(propertyName)) return null;
    return errors[propertyName];
}

但是GetErrors()的文档指出:

but documentation for GetErrors() states:

另一个示例建议仅返回字典的_errors.Values.这只是所有属性错误，但又不是实体错误.

Another example suggests just returning _errors.Values of the dictionary. And this is just all properties errors but again not entity errors.

推荐答案

按照文档中备注"部分所述: MSDN:INotifyDataErrorInfo接口

As per the "Remarks" section from the documentation: MSDN: INotifyDataErrorInfo Interface

我可能建议GetErrors的实现高度依赖于您的错误处理方案.例如，如果您不打算支持Entity-Level错误，那么您的示例代码就足够了.但是，如果确实需要支持Entity-Level错误，则可以单独处理IsNullOrEmpty条件:

I might suggest that the implementation of GetErrors is highly dependent upon your error handling scheme. If, for instance, you do not intend to support Entity-Level errors, then your example code is sufficient. If, however, you do need to support Entity-Level errors, then you may handle the IsNullOrEmpty condition separately:

Public IEnumerable GetErrors(String propertyName)
{
    if (String.IsNullOrEmpty(propertyName))
        return entity_errors;
    if (!property_errors.ContainsKey(propertyName))
        return null;
    return property_errors[propertyName];
}

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