获取属性名称和使用lambda前pression型 [英] Get property name and type using lambda expression

问题描述

我想写这将拉属性的名称和使用的语法像下面的类型的函数：

I am trying to write a function that will pull the name of a property and the type using syntax like below:

private class SomeClass
{
    Public string Col1;
}

PropertyMapper<Somewhere> propertyMapper = new PropertyMapper<Somewhere>();
propertyMapper.MapProperty(x => x.Col1)

有没有办法通过向函数传递的财产没有任何重大改变这种语法？

Is there any way to pass the property through to the function without any major changes to this syntax?

我想获得的属性名和属性类型。

I would like to get the property name and the property type.

因此​​，在下面的例子中，我将要检索

So in the example below i would want to retrieve

NAME =COL1和 TYPE =System.String

谁能帮助？

推荐答案

下面是使用足够的防爆pressions ，以得到一个属性或字段的名称，让你开始：

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");
}

调用code是这样的：

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);
    }
}

要提醒一句，虽然：（程序P）的简单说明书=＆GT; p.Name 实际上涉及相当多的工作（并可以采取可测量大量的时间）。考虑缓存的结果，而不是调用方法频繁。

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.

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