Lambda表达式C#的属性名称 [英] Property Name to Lambda Expression C#

问题描述

如何在C#中将属性名称转换为Lambda表达式?

How can I convert a property name to Lambda expression in C#?

像这样:string prop = "Name";到(p => p.Name)

public class Person{
    public string Name{ get; set; } 
}

谢谢！

推荐答案

使用表达式树，您可以生成lambda表达式.

Using expression trees you can generate the lambda expression.

using System.Linq.Expressions;
public static Expression<Func<T, object>> GetPropertySelector<T>(string propertyName)
{
    var arg = Expression.Parameter(typeof(T), "x");
    var property = Expression.Property(arg, propertyName);
    //return the property as object
    var conv = Expression.Convert(property, typeof(object));
    var exp = Expression.Lambda<Func<T, object>>(conv, new ParameterExpression[] { arg });
    return exp;
}

对于Person，您可以这样称呼它:

for Person you can call it like:

var exp = GetPropertySelector<Person>("Name");//exp: x=>x.Name

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