哪裏可以找到GetMemberInfo

Question

我已經找到了這個無處不在，我已經下載DLL爲LINQ Data並且也有在參考中添加System.Reflection，但它仍然無法找到它。

C＃代碼：

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); 
} 

在此行中出現的錯誤：

NotifyOfPropertyChanged(property.GetMemberInfo().Name); 

和錯誤讀取：

'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? 

Answer 1

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; 
}