通过MemberExpression获取属性类型 [英] Get property type by MemberExpression

问题描述

我在这里问类似的问题，
，假定这种类型的：

I ask similar question here , assume this type:

 public class Product {

public string Name { get; set; }
public string Title { get; set; }
public string Category { get; set; }
public bool IsAllowed { get; set; }

}

和这一个使用 MemberExpression ：

public class HelperClass<T> {

    public static void Property<TProp>(Expression<Func<T, TProp>> expression) {

        var body = expression.Body as MemberExpression;

        if(body == null) throw new ArgumentException("'expression' should be a member expression");

        string propName = body.Member.Name;
        Type proptype = null;

    }

}

我用它像这样的：

I use it like this:

HelperClass<Product>.Property(p => p.IsAllowed);

在助手类我只需要属性名称（在这个例子中 IsAllowed ）和属性类型（在这个例子布尔），这样我就可以得到属性名称，但我可以'吨得到属性类型。我看到在调试物业类型，如下图所示：

in HelperClass I just need property name(in this example IsAllowed) and property type (in this example Boolean) So I can get property name but I can't get property type. I see the property type in debugging as following picture shown:

那么，什么是您的建议得到属性类型？

So what is your suggestion to get property type?

推荐答案

尝试铸造 body.Member 到的PropertyInfo

public class HelperClass<T>
{
    public static void Property<TProp>(Expression<Func<T, TProp>> expression)
    {
        var body = expression.Body as MemberExpression;

        if (body == null)
        {
            throw new ArgumentException("'expression' should be a member expression");
        }

        var propertyInfo = (PropertyInfo)body.Member;

        var propertyType = propertyInfo.PropertyType;
        var propertyName = propertyInfo.Name;
    }
}

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