在哪里找到GetMemberInfo？

Question

在哪里找到GetMemberInfo？

3

我在各处查找，已经下载LINQ Data的DLL文件并在引用中添加了System.Reflection，但仍然无法找到它。

C#代码:

protected void NotifyOfPropertyChanged(string name)
{
      PropertyChangedEventHandler handler = PropertyChanged;
      if (handler != null)
      {
          handler(this, new PropertyChangedEventArgs(name));
      }
}

protected void NotifyOfPropertyChanged<TProperty>(Expression<Func<TProperty>> property)
{
      NotifyOfPropertyChanged(property.GetMemberInfo().Name);
}

错误发生在这一行：

NotifyOfPropertyChanged(property.GetMemberInfo().Name);

错误提示如下：

'System.Linq.Expressions.Expression<System.Func<TProperty>>' does not contain a definition for 'GetMemberInfo' and no extension method 'GetMemberInfo' accepting a first argument of type 'System.Linq.Expressions.Expression<System.Func<TProperty>>' could be found (are you missing a using directive or an assembly reference?

- user3157821

1个回答

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原文链接

- Federico Berasategui · Accepted Answer

public static MemberInfo GetMemberInfo(this Expression expression)
{
    var lambda = (LambdaExpression)expression;

    MemberExpression memberExpression;
    if (lambda.Body is UnaryExpression)
    {
        var unaryExpression = (UnaryExpression)lambda.Body;
        memberExpression = (MemberExpression)unaryExpression.Operand;
    }
    else
        memberExpression = (MemberExpression)lambda.Body;

    return memberExpression.Member;
}