c# - Lambda 表达式 C# 的属性名称

Question

如何在 C# 中将属性名称转换为 Lambda 表达式？

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

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

谢谢!

Answer 1

使用表达式树，您可以生成 lambda 表达式。

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 你可以这样调用它:

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