Netty Camel样品(Netty Camel samples)

 这里有足够的例子来使用表达式来获取一个属性或字段的名称来启动它： 
 
public static MemberInfo GetMemberInfo<T, U>(Expression<Func<T, U>> expression)
{
    var member = expression.Body as MemberExpression;
    if (member != null)
        return member.Member;

    throw new ArgumentException("Expression is not a member access", "expression");
}
 
 调用代码如下所示： 
 
public class Program
{
    public string Name
    {
        get { return "My Program"; }
    }

    static void Main()
    {
        MemberInfo member = ReflectionUtility.GetMemberInfo((Program p) => p.Name);
        Console.WriteLine(member.Name);
    }
}
 
 尽管如此： (Program p) => p.Name的简单(Program p) => p.Name实际上涉及相当多的工作（并且可能花费大量时间）。 考虑缓存结果，而不是经常调用该方法。 

Here's enough of an example of using Expressions to get the name of a property or field to get you started:
 
public static MemberInfo GetMemberInfo<T, U>(Expression<Func<T, U>> expression)
{
    var member = expression.Body as MemberExpression;
    if (member != null)
        return member.Member;

    throw new ArgumentException("Expression is not a member access", "expression");
}
 
Calling code would look like this:
 
public class Program
{
    public string Name
    {
        get { return "My Program"; }
    }

    static void Main()
    {
        MemberInfo member = ReflectionUtility.GetMemberInfo((Program p) => p.Name);
        Console.WriteLine(member.Name);
    }
}
 
A word of caution, though: the simple statment of (Program p) => p.Name actually involves quite a bit of work (and can take measurable amounts of time). Consider caching the result rather than calling the method frequently.